Pictured Left to Right: Yves Degroote (Development Manager ATEX – Dynaco), Christian Webster-Reed (Sales Engineer – T&D), Terry McDonald (Business Development Manager – T&D), Morgan Gent (Sales Engineer – T&D) and Frank Matthys (Sales Director – Dynaco)
Press Release Date: 02.04.2020 uploaded by Chris Dodds (T&D Sales + Marketing Manager)
Thorne & Derrick International, the Experts in Equipment for Explosive Atmospheres, today announce the signing of a Commercial Distribution Agreement with UK exclusivity for the Dynaco range of ATEX Doors suitable for hazardous areas.
Dynaco high speed roll-up doors provide significant energy efficiency and site safety improvements in the explosive atmosphere industries – this includes factories and logistics in the oil/gas, pharmaceutical, distillery, process and petrochemical sectors.
Reduced heat loss as a result of installing high speed doors can provide a ROI within 2 years.
Thorne & Derrick can provide energy saving calculations at point of enquiry.
💡 We can calculate your temperature losses and confirm the expected energy savings by installing high speed doors. Should you be interested to receive a FREE ROI REPORT to assess the energy efficiency impact Dynaco doors could have on your facility contact us.
The reduced heat loss also means fewer heaters or lower KW rated electric heaters in new builds. This reduces capital costs and reduces operating costs.
The Thorne & Derrick Sales Team have undergone extensive commercial and technical training at the Dynaco Academy in Belgium to support clients requirements.
“Thorne & Derrick International provide excellent coverage with the technical expertise to successfully spearhead our drive into the UK market – they are highly respected with blue-chip clients in our key sectors and we look forward to supporting them with the introduction of our ATEX certified doors to their customers,” comments Yves Degroote.
Thorne & Derrick were first introduced to Dynaco during 2018 Hazardex Exhibition and were impressed with the product.
Terry McDonald stated “The Dynaco high speed ATEX door is an innovative product which serves a niche application. Whilst there are many companies who specialise in high speed doors, none have any experience working in explosive atmospheres and such companies are unfamiliar with the strict regulations. The Dynaco ethos for safety, innovation and quality is perfectly aligned to T&Ds own strategy and I believe we can highlight a major safety issue to anyone already using such doors in an explosive atmosphere. Further, we can help end users become compliant by supplying a 3rd party certified product. For any clients wishing to install ATEX high speed doors, they can be safe in the knowledge that they will be using the safest door currently available on the market.”
Reducing Risk & Improving Safety | Energy Efficient With Provable Savings | Zones 1 (21) & 2 (22) with Flammable Gas or Dust Atmospheres
Explosive Atmospheres & Hazardous Area Locations & Workspaces
Tutorial | Specifying Compliant ATEX Doors for Hazardous Areas
Dynaco are part of the Entrematic Group who are one of the world’s leading manufacturers of entrance automation equipment.
Dynaco specialise in high performing industrial flexible doors. Since 1987, from their manufacturing facility in Belgium, Dynaco have supplied over 170,000 doors worldwide.
Their reputation for innovation, quality and reliability is second to none and today they produce over 15,000 doors per year.
As part of their drive for innovation, Dynaco have developed the worlds first ATEX certified high speed door. Like many other door manufacturers, Dynaco were asked for an ATEX solution for use in explosive atmospheres. Unlike their competitors who were happy to supply their normal door with an ATEX motor, Dynaco were not. They rightly decided this was non-compliant with ATEX regulations and a huge safety issue for end users.
Dynaco have developed a door which utilises an ATEX motor and electrical components.
The ATEX doors are also made from non-sparking materials and anti-static PVC.
They did not stop there.
The Dynaco door is product certified by a 3rd party notified body. Each and every door is inspected prior to it leaving the factory.
If you require a door for explosive atmospheres, there is not a safer high speed door available.
Dynaco was founded by Benoit Coenraets, the inventor of the flexible roll-up door. In 2015 Dynaco launched their S-5 Atex Door.
Thorne & Derrick are leaders in the development and distribution of Product Innovations that deliver significant improvements to clients plant, people and operational safety in the explosive atmosphere industries.
Your proactive problem solvers experienced in succession planning for the replacement of obsolete, non-conformant and legacy equipment in hazardous areas.
Your first-choice provider of innovative and competitive solutions to ensure ATEX & IECEx Compliance for Hazardous Area Electrical, HVAC & Process Instrumentation Equipment to UK and international projects.
Control Panels | Plugs | Isolators | Enclosures & Junction Boxes | Lighting | Control Stations | Motor Starters | Heat Trace | Gas Detection | Flame Detection | Process Instrumentation | Process Heating | Ventilation Fans | Security Access Control
Competitive Prices | Extensive Stocks | Technical Support | Express Delivery
Press Release Date: 04.07.2019 uploaded by Chris Dodds (T&D Sales + Marketing Manager)
Category: Stockist Distributor Agreement Announcement
Thorne & Derrick International announce that they have signed a Preferred Distributor Agreement with Raytec, the world leading manufacturer of LED lighting products for hazardous areas and explosive atmosphere locations.
Thorne & Derrick’s Business Development Manager Terry McDonald comments, “our expertise and knowledge of 
the market will prove invaluable in developing sales of Raytec hazardous area LED lights. We are currently supporting several clients undergoing workplace lighting upgrades – we are specifying, designing and supplying their switch out of conventional fluorescent into modern technology LED.”
Why Raytec?
“Partnering with Raytec as our key supplier for hazardous area LED lighting was an easy decision to make. Their hazardous area lighting products offer a safe and reliable solution to lighting requirements in explosive atmospheres. In truth there are also many other brand options in the market place but what makes Raytec stand out from the crowd is their modular design concept which has been done with end user maintenance in mind.”
“Clients are always impressed with the concept and even more so by the cost savings achievable in operational expenditure. Taking innovative solutions to clients is a key part of our strategy and I am sure the partnership with Raytec will be a long and prosperous one.”
“Our Technical Sales Team are product trained, CompEx certificated and looking forward to introducing the complete Raytec lighting range to new and existing customers,” Terry adds.
Why Thorne & Derrick?
“We’re delighted to partner with Thorne & Derrick for the distribution of our hazardous area LED lighting products. They hold years of experience in the market and have developed a strong client base which will be important in helping to open up new opportunities for us,” comments Barry Director of Hazardous Area Division.
We’re looking forward to working closely with Thorne & Derrick and are confident this will be the start of a long and successful journey together,” Barry concludes.
Thorne & Derrick International, based in the UK, are Approved Vendors to most Oil & Gas exploration and production companies and international EPC contractors including Bechtel, Petrofac, Saipem and Lamprell – our key sectors are the process, pharmaceutical, chemical, utility, food/beverage, renewable and oil/gas industries.
We are the Explosive Atmosphere Experts to COMAH-site operators adding regional and national supply chain value: providing innovative and often customised Ex solutions engineered to improve site safety and reliability.
Lighting Hazardous Areas
💡 SPARTAN LED Lighting Is Highly Energy Efficient – Less Heat, More Light, Lower Cost
SPARTAN is the complete range of LED Lighting, designed and manufactured in the UK by Raytec, approved for all ATEX and IEC Ex Zone 1 and Zone 2 hazardous area locations.
SPARTAN Floodlight, Bulkhead, High Bay and Linear Light Fittings with emergency and industrial versions are available. To combine excellent customer service with the ability to deliver from stock overnight, T&D are stocking Raytec SPARTAN bulkhead, floodlight and both standard and emergency light fittings.
Innovation In Illumination
At the HazardEx 2019 awards Raytec were awarded ‘Highly Commended’ in the Technical Innovation category – their Intelligent Emergency Luminaire with automatic self-test function significantly improves the safety and reliability of emergency lighting installations in hazardous areas.
Since 1985, Thorne & Derrick have established a solid reputation for the reliable supply of leading brands across our core product groups – we have a multi-million pound stock capacity and can supply many products next day.
Thorne & Derrick at Raytec HQ UK | The Home of Hazardous Area Lighting
Pictured Left to Right: Callum Ryder (Marketing Manager – Raytec), Natalie Lundie (Social Media & SEO Marketing – T&D), Chris Dodds (Sales & Marketing Manager – T&D), Richard Derrick (MD – T&D), Terry McDonald (Business Development Manager – T&D) and Barry Thompson (Raytec – Director of Hazardous Area Division).
Further Reading
LV HV Electrical & Process Instrumentation Equipment for Explosive Atmospheres
Specialist Distributors of Hazardous Area & Explosion Proof Equipment with IECEx & ATEX Certifications – we react with a rapid response to your enquiry to ensure downtime is minimised and reliable Power, Light & Heat is restored or provided.
Key Product Categories: Control Panels | Plugs & Sockets | Isolators | Enclosures & Junction Boxes | Control Stations | Motor Starters | Heat Trace Cables & Trace Heating Systems | Gas Detection & Detectors | Fire Detection & Detectors | Heat Detectors | Electrical Heating & Heaters | Process Instrumentation
Electrical Power LV HV | Heating | Lighting | Process Instrumentation | EX Specialists
Self-regulating vs constant wattage trace heating is a cable-technology comparison. Both can provide frost protection and process temperature maintenance, but they regulate output differently and have different installation, control and temperature capabilities.
For a broad introduction to the complete system, read how electrical trace heating works. This article concentrates only on the differences that affect cable selection.
The decision should consider:
| Cable Type | How Output Behaves |
|---|---|
| Self-regulating | Electrical resistance within the conductive core changes locally with temperature, so heat output increases as the cable cools and decreases as it warms. |
| Constant wattage | The heating circuit provides a defined output when energised. Temperature is managed through system design and suitable control equipment rather than local self-regulation. |
Self-regulating does not mean that every system can operate without a thermostat, controller or limiter. Control may still be required for process accuracy, energy management, alarms, equipment protection or hazardous-area temperature classification.
A self-regulating cable normally contains two parallel bus wires embedded in a conductive polymer heating core. As the local temperature changes, the resistance of the core changes and alters the heat generated at that point along the cable.
Explore the available self-regulating trace heating cables for safe-area and hazardous-area applications.
Constant wattage cables use a resistance heating element to deliver a defined power output while energised. Parallel-zone designs contain repeated heating zones, while series-resistance cables are engineered to a specific circuit resistance and length.
View the constant wattage trace heating cable range for process and industrial applications.
| Selection Factor | Self-Regulating Cable | Constant Wattage Cable |
|---|---|---|
| Output response | Varies locally with cable temperature | Defined output while energised |
| Cut-to-length | Usually cut to length within maximum circuit limits | Parallel-zone types cut at contact intervals; series types are engineered lengths |
| Overlap | Some products permit overlap subject to instructions | Normally must not touch, cross or overlap unless specifically approved |
| Temperature control | May still require control depending on duty | Normally requires suitable thermostatic or electronic control |
| Complex fittings | Often convenient around valves, flanges and irregular surfaces | Requires careful spacing and routing to prevent local overheating |
| Energy behaviour | Output reduces as the cable warms | Energy use is governed mainly by output, operating time and control strategy |
| Temperature capability | Available across low, medium and some high-temperature duties | Available for wider specialist or higher-temperature duties depending on construction |
| Circuit design | Maximum circuit length affected by cable, voltage, start-up temperature and protection | Affected by cable construction, zone spacing, resistance, voltage and control |
| Typical selection reason | Variable ambient conditions, simple field installation and frost protection | Stable output, specific process duty or temperature range |
Neither technology should be selected from its nominal watts-per-metre rating alone. The required output should first be established through a trace heating heat loss calculation.
For self-regulating cable, confirm the output available at the required maintain temperature using the manufacturer’s power-output curves or design software. The nominal output may be stated at a different reference temperature.
For constant wattage cable, confirm that the fixed output and control arrangement can maintain the required temperature without exceeding the pipe, product, cable or area-classification limits.
Installation convenience depends on the cable construction, pipework layout and approved accessory system.
| Design Point | Self-Regulating | Constant Wattage |
|---|---|---|
| Valves and flanges | Flexible routing and permitted overlap may simplify allowances | Spacing and contact must be carefully controlled |
| Branching | Approved splice and tee components are used where permitted | Must follow the cable’s zone or circuit design |
| Long circuits | Maximum length can be limited by start-up current | Parallel or series designs may suit different long-line duties |
| Termination | Field termination kits are commonly available | Termination depends on parallel-zone or engineered series construction |
| Protection | Circuit-breaker and earth-fault selection must consider start-up behaviour | Protection must match designed current, output and control method |
| Repair | Approved field repair systems may be available | Repairability depends strongly on the cable construction |
Installation should follow the cable-specific instructions and the existing trace heating installation guide.
These are general patterns rather than automatic choices. The correct technology depends on the calculated duty and the performance limits of the individual cable.
Self-regulating cable can reduce local output as temperatures rise, but total energy use still depends on cable output, circuit length, insulation, control strategy and operating time.
A constant wattage system can also operate efficiently when correctly sized and controlled. Oversizing either technology or operating it continuously when heat is not required can increase energy consumption.
Lifecycle considerations:
Both technologies may be available as certified systems for explosive atmospheres. Selection must address more than the cable certificate.
See the dedicated ATEX trace heating range for certified cables, controls and components.
| Application Characteristic | Technology Commonly Considered |
|---|---|
| Low-temperature frost protection with variable ambient conditions | Self-regulating |
| Complex pipe fittings and field cut-to-length installation | Self-regulating |
| Defined process output with active temperature control | Constant wattage |
| Higher temperature or specialist industrial duty | Constant wattage or mineral-insulated, subject to design |
| Very high temperature, high output or severe mechanical environment | Mineral-insulated may be required |
| Long pipeline | Cable technology should be selected from heat loss, voltage, circuit length and control requirements |
The table is a starting point only. Product data, design software and technical review are required before final specification.
Provide the following design data:
It can reduce its local output as temperature rises, but total system efficiency also depends on correct sizing, insulation, control, circuit length and operating time. A correctly designed constant wattage system can also be efficient.
No. A thermostat, controller or limiter may still be required for process accuracy, energy management, alarms, equipment protection or hazardous-area temperature control.
Not always. Parallel-zone cable is cut at defined contact intervals, while series-resistance cable is designed to a specific length and resistance. Follow the individual product instructions.
Some self-regulating products allow overlap within their stated limits. Constant wattage and series-resistance cables generally must not touch or overlap unless the manufacturer explicitly approves it.
Self-regulating cable is commonly selected because it responds to local temperature and can be convenient to install. The final choice still depends on heat loss, pipe material, circuit length, environment and approvals.
Constant wattage, series-resistance or mineral-insulated cable may offer suitable temperature capability, but the selection depends on maintain temperature, exposure temperature, output, circuit length and environment.
Thorne & Derrick provides heat-loss calculation, cable selection and complete electrical heat tracing system support for frost protection, process maintenance and hazardous areas.
LED and xenon are two of the principal light-source technologies used in hazardous area visual signalling. Both can provide an effective warning, but they produce different signal patterns and are selected using different performance criteria.
An LED ATEX beacon can provide continuous or electronically controlled signalling, depending on the model. A xenon ATEX beacon uses a flash tube to produce a brief, high-intensity pulse and is normally specified by its flash energy in joules.
Thorne & Derrick supplies a comprehensive range of ATEX beacons incorporating LED, xenon, steady, flashing, strobe and electronically rotating visual signals. For a wider introduction to hazardous area visual signalling, read What Is an ATEX Beacon?
Quick answer: select LED where configurable signal modes, continuous indication or long solid-state operating life are priorities. Consider xenon where the specification calls for a defined high-intensity flash measured in joules. Certification and application suitability must be confirmed separately.
| Selection Factor | LED Beacon | Xenon Beacon |
|---|---|---|
| Light source | Light-emitting diodes | Xenon flash tube |
| Typical signal | Steady, blinking, strobe or electronically rotating, depending on model | Brief, high-intensity flashing signal |
| Common performance data | Optical intensity, operating pattern, frequency and current consumption | Flash energy in joules, flash frequency and current consumption |
| Continuous indication | Available on suitable models | Not the normal function of a xenon strobe |
| Configurable modes | Multiple electronic modes may be available | Normally a defined flash pattern |
| Service consideration | Solid-state light source with no xenon flash tube | Flash-tube operating life should be considered |
| Typical reason for selection | Flexible signalling, steady status indication or electronic rotating effect | Defined high-intensity pulsed warning |
Important comparison point: an LED beacon’s optical output and a xenon beacon’s flash energy are not directly interchangeable measurements. A stated number of joules should not be compared directly with a candela or lumen figure.
An LED beacon uses an array of light-emitting diodes to generate the required visual signal. The LEDs may remain continuously illuminated or be controlled electronically to create blinking, pulsed or rotating effects.
The exact capabilities depend on the product. Some models provide only a single steady or flashing output, while others offer several modes selected during installation.
These advantages should not be treated as universal. The actual power consumption, visibility, operating life and available modes depend on the selected model, voltage and colour.
A xenon beacon stores electrical energy and discharges it through a xenon-filled flash tube. This creates a brief, intense pulse of light.
Xenon strobe performance is commonly described using flash energy in joules and flash frequency. A higher joule figure indicates greater energy released during each flash, but it does not independently determine visibility in every installation.
The flash-tube operating life, current consumption and required energy level should be considered during selection. A higher-energy xenon strobe can require more electrical current than a lower-energy version.
The most important difference between LED and xenon is not simply which technology is brighter. The two technologies communicate visually in different ways.
An LED signal can remain visible continuously or create a repeating electronic pattern. This can make LED suitable for process-status indication, persistent warnings or applications where several different modes are needed.
A xenon strobe produces a short pulse followed by a period without illumination. This creates a visually distinctive alarm pattern, particularly where the project specifies a flash energy and frequency.
Visibility depends on more than the light source. Consider:
LED is often associated with lower energy consumption, but this should not be assumed for every hazardous area beacon. Current demand can vary significantly according to voltage, LED colour, signal mode and optical output.
A high-output LED strobe mode may draw more current than a lower-output LED rotating pattern. Likewise, a 15J xenon beacon will normally have different electrical requirements from a 5J version.
The control-panel output, power supply, relay capacity, cable size and voltage-drop calculation should use the data for the exact ordered configuration.
LEDs are solid-state components and are frequently selected for applications where long service life and reduced routine replacement are priorities.
Xenon flash tubes have a stated or expected operating life based on the number of flashes. The anticipated alarm duty and testing schedule should therefore be considered.
Neither technology removes the need for hazardous area inspection and maintenance. The enclosure, cable entries, seals, fasteners, lens, guard, earthing arrangements and equipment marking must remain in serviceable condition.
Yes. The signal colour can affect the apparent output and visibility of both technologies.
Some LED products use coloured LEDs with a matching or transparent lens. Xenon products normally use a broad-spectrum flash tube with a coloured lens or dome.
Manufacturer performance data should be checked for the exact colour. The intended meaning must also be established by the site alarm philosophy or project specification rather than assumed from the colour alone.
LED or xenon technology does not independently determine whether a beacon is suitable for a hazardous area. The complete certified product construction must be assessed.
Check:
Read the H&P guide to ATEX and IECEx certification of hazardous area equipment.
Neither technology is universally better. The correct choice is the one that satisfies the hazardous area specification, signal requirements, viewing conditions, electrical design and maintenance strategy.
For a complete step-by-step selection process, read How to Select an ATEX Beacon.
The Eaton FHF dSLB20 family provides a useful example of the practical differences between the two technologies.
Provides steady, blinking, strobe and two electronically rotating operating patterns. It is suitable where configurable visual signalling is required.
Provides a xenon strobe signal with 5J and 15J options and an approximate flash frequency of 60 flashes per minute.
These examples do not replace product selection. Confirm the complete certification, temperature range, voltage, current, colour and installation requirements for the ordered version.
Not necessarily. The two technologies produce different signal characteristics and are often specified using different measurements. Compare the manufacturer’s optical data, signal pattern and intended viewing conditions.
It can, but this is not universal. Current consumption depends on the product, voltage, LED colour, signal mode and required output. Use the exact electrical data for the selected configuration.
Some LED products provide a strobe-style electronic pattern. However, its optical characteristics are not automatically equivalent to a xenon flash with a specified energy in joules.
LED is frequently chosen for long solid-state light-source life. Both technologies still require routine hazardous area inspection, functional testing and enclosure maintenance.
Potentially, provided the control system supports their voltage, current, monitoring and switching requirements and each product is correctly certified for its installation location.
LED is normally more suited to continuous status indication because suitable products can remain steadily illuminated. A xenon beacon is primarily used for a flashing warning signal.
Send Thorne & Derrick the hazardous area classification, required signal pattern, voltage, colour, viewing conditions and installation environment for product selection support.
Explore LED, xenon, steady, flashing and rotating signalling devices for Zone 1, Zone 2, Zone 21 and Zone 22 installations.
Selecting an ATEX beacon involves more than choosing a lens colour or deciding between an LED and xenon light source. The product must be suitable for the complete hazardous area classification, environmental conditions, electrical system and required visual signal.
The selection process should begin with the hazardous area documentation. The zone, gas or dust group, temperature requirements, ambient conditions and required certification must be understood before comparing individual beacon models.
Thorne & Derrick supplies ATEX beacons for hazardous area visual signalling with LED, xenon, steady, flashing, strobe and electronically rotating options.
For an introduction to their purpose and construction, read What Is an ATEX Beacon?
Selection principle: start with the hazardous area classification and required equipment marking. Signal technology, voltage, colour and mounting configuration should be considered only after the certification requirements have been established.
Before selecting a beacon, obtain the hazardous area classification for the proposed installation location. This should identify whether the risk relates to gas, vapour, mist or combustible dust and how frequently the explosive atmosphere is expected to occur.
Visual signalling equipment is commonly required in Zones 1, 2, 21 and 22:
| Zone | Atmosphere | General Description | Typical ATEX Category |
|---|---|---|---|
| Zone 1 | Gas, vapour or mist | An explosive atmosphere is likely to occur occasionally during normal operation. | Category 2G or equipment providing a suitable higher level of protection |
| Zone 2 | Gas, vapour or mist | An explosive atmosphere is not likely during normal operation and, if present, will normally exist only briefly. | Category 3G or equipment providing a suitable higher level of protection |
| Zone 21 | Combustible dust | A combustible-dust atmosphere is likely to occur occasionally during normal operation. | Category 2D or equipment providing a suitable higher level of protection |
| Zone 22 | Combustible dust | A combustible-dust atmosphere is not likely during normal operation and, if present, will normally exist only briefly. | Category 3D or equipment providing a suitable higher level of protection |
The zone alone is not enough to complete the selection. The gas or dust group, equipment protection level, temperature requirement and ambient conditions must also be confirmed.
Read the H&P guide to hazardous area zones and explosive atmosphere classification.
The beacon must carry certification appropriate to the destination market and installation specification. Depending on the project, this may include ATEX, UKEX, IECEx or additional regional approvals.
The complete product marking should be reviewed rather than relying on a general description such as “Zone 1 beacon”.
The equipment group and category indicate the intended industry and level of protection. Most onshore and offshore processing applications use Group II equipment, but the required category must correspond with the area classification.
The equipment protection level may be shown using markings such as Gb, Gc, Db or Dc. The required level should be established from the hazardous area design.
Gas atmospheres may be classified using groups IIA, IIB or IIC. Combustible-dust atmospheres may use groups IIIA, IIIB or IIIC. The beacon marking must be suitable for the group identified in the site classification.
Hazardous area beacons can use protection concepts including flameproof, increased safety, intrinsic safety and protection by enclosure. Some products combine more than one concept, such as a flameproof light chamber with an increased-safety terminal compartment.
Read more about ATEX and IECEx certification of hazardous area equipment.
Temperature requirements are a critical part of beacon selection. The equipment must not create an external surface temperature capable of igniting the identified atmosphere under the certified conditions of use.
For gas applications, the product marking may include a temperature class such as T4, T5 or T6. Combustible-dust equipment is normally marked with a maximum surface temperature in degrees Celsius.
The permitted ambient-temperature range must also cover the lowest and highest expected site temperatures. A product may have different temperature classifications at different ambient limits.
Do not assume: a beacon described as T6 is suitable across its entire published temperature range. The permitted ambient range may reduce as the required temperature class becomes more restrictive.
Once the hazardous area requirements are understood, determine how the alarm or status condition should be communicated.
| Signal Type | Visual Effect | Typical Use |
|---|---|---|
| Steady | Continuous illumination | Persistent equipment status, process condition or warning |
| Blinking | Regular on-and-off light pattern | Changing condition or attention signal |
| Strobe | High-intensity pulses | Alarm or warning requiring a prominent visual signal |
| Rotating | Moving or electronically sequenced light | Distinctive warning or plant-status indication |
| Consideration | LED | Xenon |
|---|---|---|
| Signal options | Can provide steady, blinking, strobe or electronically rotating patterns | Normally provides a defined high-intensity flash |
| Selection data | Light output, signal pattern, current and colour | Flash energy, flash frequency, current and colour |
| Maintenance | Frequently selected for long operating life | Flash-tube life should be considered |
| Typical requirement | Flexible status or alarm signalling | Prominent pulsed visual warning |
Flash energy or LED technology alone does not establish whether a signal will be sufficiently visible. Viewing distance, lens colour, ambient light, obstructions, mounting height and the site alarm philosophy should also be considered.
Common beacon colours include red, amber, green, blue, yellow and clear or white. The available colours depend on the selected model.
The meaning assigned to each colour should be defined by the site alarm philosophy, operating procedure or project specification. It should not be assumed from the colour alone.
Colour selection can also affect the apparent optical output. Manufacturer performance data should therefore be checked for the exact lens or LED colour.
Confirm the required supply voltage before selecting the full product reference. Hazardous area beacons can be available in low-voltage DC and mains-voltage AC configurations, but the options vary between models and signal technologies.
Check:
Current consumption can vary by voltage, signal mode and colour. The highest applicable value should be considered when sizing the supply and control circuit.
Hazardous area certification does not automatically establish suitability for every outdoor, offshore or corrosive environment.
Review the following:
IP66 and IP67 are common protection ratings for external hazardous area signalling equipment, but the correct rating should be based on the actual installation conditions.
Confirm how and where the beacon will be installed before placing an order. The selected mounting position should provide the required visibility without obstructing access for inspection and maintenance.
Confirm:
Cable glands, stopping plugs and adaptors must be selected and installed so that the product certification and enclosure protection are maintained.
The following products illustrate how the required signal type can influence the selection. Complete certification and technical suitability must still be checked for each application.
Where a continuous visual indication is required, a steady filament or fluorescent product may be considered.
Where steady, blinking, strobe or electronically rotating modes are required from one product platform, a configurable LED signal light may be suitable.
Where a defined xenon strobe signal is required, select the appropriate flash energy, voltage, colour and certified temperature range.
Providing complete application information helps reduce the risk of selecting an unsuitable product or incomplete ordering code.
Equipment providing a suitable higher level of protection may be acceptable in a lower-risk zone, but its complete certification, environmental suitability and project requirements must still be checked.
No. An IP rating describes protection against ingress but does not replace hazardous area certification. Both the Ex marking and ingress protection must be suitable for the application.
No. The correct technology depends on the required visual effect, viewing conditions, flash energy, operating mode, electrical supply and maintenance strategy.
Yes. The optical performance can vary by lens or LED colour. Check the manufacturer’s performance data for the exact configuration.
Usually, the operating voltage forms part of the certified product configuration and ordering code. It should be confirmed before purchase rather than changed on site.
Installation, inspection and maintenance should be completed by suitably competent personnel using the applicable hazardous area standards, product instructions and site procedures.
Send Thorne & Derrick the zone, atmosphere, temperature requirements, voltage, signal type, colour and installation conditions for product selection support.
Explore LED, xenon, steady, flashing and rotating visual signalling devices for Zone 1, Zone 2, Zone 21 and Zone 22 installations.
A reliable trace heating testing programme checks the condition and performance of the heating cable, electrical connections, controls, sensors, insulation and weatherproofing before a fault develops into frozen pipework, lost production or process instability.
For readers who need the underlying operating principles first, see how an electrical trace heating system works. This guide remains focused on inspection, maintenance and fault finding rather than repeating the general definition of trace heating.
The maintenance objective:
Electrical isolation, testing, repair and recommissioning should be completed by suitably competent personnel. Follow the current installation and maintenance instructions for the specific heating cable, connection system, controller and area classification. Do not energise a visibly damaged or unverified circuit.
A trace heating circuit can remain energised while delivering less heat than the process requires. A failed sensor, damaged cable, missing insulation or incorrect controller setting may not be obvious until temperatures fall or a product begins to thicken, crystallise or freeze.
Preventive maintenance helps identify faults while the system can still be inspected, isolated and repaired safely. It also provides evidence that the circuit, control equipment and protective devices have been checked against the design and operating requirements.
Testing requirements vary by manufacturer, project specification, site risk and application. Typical inspection points include:
Recommended test stages:
The existing trace heating installation guide covers the installation sequence. The checks below focus on maintaining and diagnosing a system once installed.
Before opening enclosures, disconnecting circuits or applying test equipment, confirm the site isolation procedure and the limits of the work.
Insulation-resistance, conductor-resistance and current readings must be assessed against the cable manufacturer’s instructions, circuit length, test voltage, temperature and commissioning records. A value copied from another cable type or project may be inappropriate.
A visual inspection should cover all accessible parts of the circuit before electrical testing begins.
| Inspection Area | What to Check |
|---|---|
| Heating cable | Cuts, crushing, abrasion, overheating, tight bends, unsupported sections and unauthorised repairs |
| Power connections | Loose covers, damaged seals, moisture, corrosion, overheating and secure cable entries |
| End seals, splices and tees | Correct assembly, physical damage, water ingress and compatibility with the cable |
| Junction boxes | Condition, gland entries, terminals, earthing, identification and enclosure integrity |
| Controllers and limiters | Display condition, setpoints, alarm status, sensor inputs and signs of overheating |
| Pipe fittings | Cable routing around valves, flanges, supports, pumps and removable sections |
| Thermal insulation | Missing, compressed, wet or damaged insulation and incorrectly refitted jackets |
| Weatherproof cladding | Open seams, damaged seals, missing fasteners and entry points for water |
| Labels and records | Circuit identification, warning labels, drawings and previous test results |
The exact test sequence must follow the cable and component manufacturer’s instructions. Common checks include:
An insulation resistance test is used to check the integrity of the cable insulation and jacket system. Readings can be affected by cable length, moisture, temperature, test voltage and the connected equipment, so the approved procedure and acceptance criteria must be used.
Continuity and resistance checks help confirm that the heating circuit is complete and that the measured resistance is consistent with the cable type, designed length and temperature. Unexpected readings can indicate an open circuit, short circuit, damaged conductor or an incorrect installed length.
Once the circuit has passed the required pre-energisation tests and can be energised safely, measure supply voltage and operating current under controlled conditions. Compare the results with the design information and commissioning record rather than relying on a generic expected value.
Confirm that the circuit protection and earth-fault or residual-current protection are appropriate for the system and have been tested in accordance with the site electrical maintenance procedure.
A sound heating cable cannot maintain the correct temperature if its control or sensing system is incorrect.
Controller and sensor checks:
For hazardous-area temperature regulation, see the available heat trace thermostats and digital temperature controllers and trace heating temperature limiters.
Thermal insulation is part of the heating system, not a separate cosmetic layer. Wet, damaged, missing or compressed insulation increases heat loss and can make a correctly powered cable appear undersized.
If the original duty or insulation has changed, the system may require a new trace heating heat loss calculation rather than a simple electrical repair.
| Observed Problem | Possible Causes | Initial Checks |
|---|---|---|
| Circuit will not energise | Loss of supply, tripped protection, open circuit, failed controller or interlock | Verify isolation status, supply, protective devices, control demand and circuit continuity |
| Circuit trips immediately | Damaged insulation, moisture ingress, short circuit, incorrect connection or unsuitable protection | Keep isolated; inspect components and complete the specified electrical tests |
| Pipe remains too cold | Insufficient output, missing insulation, incorrect setpoint, poor sensor location, low voltage or damaged cable | Check heat loss, insulation, controls, voltage, current and installed cable length |
| Pipe becomes too hot | Incorrect setpoint, failed sensor, bypassed control, excessive cable output or incorrect cable arrangement | Isolate if unsafe; verify sensor position, controller response and design limits |
| Intermittent alarms | Loose terminal, moisture, sensor fault, unstable supply or developing cable damage | Review event history and inspect connections, sensors and cable condition |
| One local area is cold | Missing cable allowance, damaged cable, displaced insulation or poor cable contact | Inspect valves, flanges, supports and recently disturbed insulation |
| High energy use | Incorrect control mode, low setpoint accuracy, wet insulation or unnecessary continuous operation | Check control strategy, insulation condition, current and operating hours |
The appropriate maintenance interval depends on the consequence of failure, environmental exposure, process duty, area classification and manufacturer requirements.
| System Condition | Maintenance Consideration |
|---|---|
| Seasonal frost protection | Inspect and test before the expected cold-weather period |
| Continuous process maintenance | Use planned intervals aligned with production and shutdown schedules |
| Harsh outdoor or offshore exposure | Increase attention to cladding, corrosion, moisture and mechanical damage |
| Frequently disturbed insulation | Inspect after every intervention involving valves, instruments or pipework |
| Critical or hazardous process | Use documented risk-based intervals, alarm review and competent technical oversight |
| Monitored multi-circuit system | Review logged temperatures, current, earth leakage and alarm trends routinely |
Trend information is often more useful than a single isolated reading. Maintain a circuit record containing:
Recommended circuit record:
Electrical heat tracing installed in explosive atmospheres requires additional controls over isolation, permits, equipment certification, enclosure integrity, temperature limitation and repair methods.
View the ATEX trace heating systems and components available for hazardous-area applications.
The interval should be based on the manufacturer’s instructions, project specification, system criticality, site conditions and risk assessment. Seasonal frost-protection systems are commonly checked before winter, while critical process systems may require more frequent inspection or continuous monitoring.
It is used to assess the integrity of the heating cable insulation and jacket system. The correct test voltage, connections and acceptance criteria must come from the specific cable manufacturer’s instructions.
Possible causes include damaged or missing insulation, an incorrect setpoint, poor sensor location, insufficient cable output, low supply voltage, local heat sinks or a change in the process duty. Electrical operation alone does not confirm adequate thermal performance.
Some cable systems have approved repair methods and components, while others require replacement of the affected section or complete circuit. Repairs must follow the manufacturer’s instructions and be retested before energisation.
Self-regulating output responds locally to temperature, but controls may still be needed for energy management, process accuracy, alarms, safety or hazardous-area temperature limitation. The system design determines the control method.
Record the fault, visual findings, test equipment, readings, repair method, replacement components, final retest results and recommissioning data. Update drawings and cable schedules where the circuit has changed.
Thorne & Derrick supports the specification, replacement and upgrade of electrical heat tracing cables, controls and connection components for commercial, industrial and hazardous-area systems.
An ATEX beacon is a visual signalling device designed and certified for use where flammable gas, vapour, mist or combustible dust could create a potentially explosive atmosphere.
Depending on its design, the beacon may produce a steady, flashing, strobe, blinking or rotating visual signal. It can communicate an emergency alarm, evacuation condition, process event or equipment status without introducing unsuitable electrical equipment into the classified area.
Thorne & Derrick supplies a complete range of ATEX beacons with LED, xenon, steady-state, flashing and electronically rotating options for hazardous area signalling applications.
In brief: an ATEX beacon provides a visible warning or status signal while using a certified construction intended for a defined explosive atmosphere. Its complete certification and product marking must match the installation.
The purpose of an ATEX beacon is to provide a visible signal in a location where an ordinary industrial light or beacon may not be suitable.
The beacon does not normally detect gas, prevent a release or extinguish a fire. Instead, it communicates information generated by a fire and gas system, process-control system, emergency alarm, machine control or other monitoring equipment.
Typical applications include:
Visual signalling devices can operate independently or form part of a broader range of hazardous area sounders and beacons, including audible alarms, combination units, status lights and loudspeakers.
Both products may provide a similar visible warning, but their construction, testing and intended installation conditions are different.
| Comparison | ATEX Beacon | Ordinary Industrial Beacon |
|---|---|---|
| Intended environment | Defined potentially explosive atmospheres | Non-classified industrial locations |
| Certification | Certified and marked for stated hazardous area conditions | Not necessarily certified for explosive atmospheres |
| Selection basis | Zone, atmosphere, group, temperature and protection concept | Voltage, light output, ingress protection and environment |
| Installation | Requires appropriate hazardous area installation practices | Standard industrial installation practices may apply |
Flammable gases, vapours, mists and combustible dusts can form an explosive mixture when combined with air. If this atmosphere encounters a sufficient ignition source, an explosion may occur.
Electrical equipment installed in a classified area must therefore be designed and selected to reduce the possibility of ignition.
Depending on the protection concept, this may involve containing an internal explosion, preventing ignition-capable sparks or temperatures, limiting electrical energy or preventing combustible dust from entering the enclosure.
The required approval can depend on the destination market, project specification and installation. ATEX, UKEX, IECEx and other regional approvals should not be treated as interchangeable without checking the applicable requirements.
Read the complete guide to ATEX and IECEx certification of hazardous area equipment.
Hazardous areas are classified according to the type of explosive atmosphere and how frequently it is expected to occur.
Gas, vapour and mist atmospheres use Zones 0, 1 and 2. Combustible-dust atmospheres use Zones 20, 21 and 22.
| Zone | Atmosphere | General Definition |
|---|---|---|
| Zone 1 | Gas, vapour or mist | An explosive atmosphere is likely to occur occasionally during normal operation. |
| Zone 2 | Gas, vapour or mist | An explosive atmosphere is not likely during normal operation and, if it occurs, will normally exist only briefly. |
| Zone 21 | Combustible dust | A combustible-dust atmosphere is likely to occur occasionally during normal operation. |
| Zone 22 | Combustible dust | A combustible-dust atmosphere is not likely during normal operation and, if it occurs, will normally exist only briefly. |
A beacon described as suitable for Zone 1 should not automatically be assumed suitable for every gas, combustible dust or temperature condition. Its complete product marking must match the hazardous area specification.
Read the H&P guide to hazardous area zones and explosive atmosphere classification.
LED beacons use light-emitting diodes and may provide steady, flashing, blinking or electronically rotating signals. They are often selected where long operating life, defined signal patterns or reduced maintenance requirements are important.
Xenon beacons use a xenon flash tube to produce a high-intensity visual pulse. They are commonly specified according to flash energy in joules, flash frequency, supply voltage and lens colour.
A steady beacon provides continuous visual indication. It may show a persistent warning, plant condition, equipment state or process status.
Rotating beacons create a moving visual signal. Some use a mechanical rotating assembly, while others reproduce the effect electronically using sequenced LED segments.
The following products illustrate steady, configurable LED and xenon-strobe signalling technologies.
No. “Explosion proof” is often used as a general search term, but equipment for explosive atmospheres can use several different protection concepts.
Some products combine protection concepts. For example, the light chamber may use flameproof protection while the terminal compartment uses increased safety.
The product label and certification documents provide the information required to assess whether the equipment is suitable for a particular installation.
Depending on the product, its marking may identify:
The marking must be read as a complete specification. Selecting a product using only its zone number, ingress rating or product name is not sufficient.
Visual signalling devices are used wherever an alarm or status indication is required within a classified environment.
Product selection should begin with the hazardous area specification rather than the preferred manufacturer, colour or signalling technology.
Important selection criteria include:
Send Thorne & Derrick the hazardous area classification, required signal type, operating voltage, lens colour and installation conditions for product selection support.
ATEX is the name commonly used for the European framework relating to equipment and protective systems intended for use in potentially explosive atmospheres.
The difference relates to the classified area and the expected frequency of an explosive gas atmosphere. The beacon must carry certification suitable for the specified zone and complete application.
Only when the product carries the required certification and markings for both the gas and combustible-dust application.
No. Hazardous area beacons can provide steady, flashing, strobe, blinking, mechanically rotating or electronically rotating signals, depending on the product.
The intended meaning should be defined by the site alarm philosophy or project specification. It should not be assumed from the lens colour alone.
Many models can be integrated into wider alarm and control systems. Compatibility must be checked against the supply voltage, current, control method, certification and overall system design.
Explore LED, xenon, steady, flashing and rotating signalling options for Zone 1, Zone 2, Zone 21 and Zone 22 installations.
Published 13 Mar 2020
Press Release Date: 02.04.2020 uploaded by Chris Dodds (T&D Sales + Marketing Manager) World’s First Fully Certified ATEX Doors Thorne & Derrick International, the Experts in Equipment for Explosive Atmospheres, today announce the signing of a Commercial Distribution Agreement...
Published 04 Jul 2019
Press Release Date: 04.07.2019 uploaded by Chris Dodds (T&D Sales + Marketing Manager) Category: Stockist Distributor Agreement Announcement Thorne & Derrick International announce that they have signed a Preferred Distributor Agreement with Raytec, the world leading manufacturer of LED...
