Humidity & Temperature Measurement
Manufactured by Rotronic, a world-leader in the manufacture of precision accurate Temperature Measurement Instruments, their HygroClip provides measurement for both relative humidity and temperature – a family of digital measurement instruments with portable, benchtop and fixed transmitter products for commercial, industrial and hazardous area locations.
HygroClip digital probes are available in a wide range of configurations to cover most temperature and humidity measurement applications.
Basically, Rotronic HygroClip provides high measurement performance at low cost with 100% interchangeability with “plug and play” technology. HygroClip features a custom ASIC (Application Specific Integrated Circuit) designed specifically for measurement of temperature and humidity.
Rotronic HygroClip is used as a stand alone sensing module with both analogue and digital outputs – the measurement module is integrated into Rotronic instruments, data-loggers, transmitters and probes.
HygroClip is a digitally based relative humidity and temperature measurement module, part of the Rotronic range of precise measurement instruments utilising digital technology to increase the precision of process instrumentation. The precision of %rh (relative humidity) measurement depends on several factors:
Rotronic HygroClip is a small module containing sensors and relating circuitry – the measured value is defined internally as a robust signal before connection to transmission equipment. Error correction is controlled more consistently while measurement and thermal characteristics are simpler to define.
The digital signal processing technology pioneered by Rotronic provides multiple options in the provision of error correction and also scope for increased flexibility than conventional analogue circuitry with much faster integration of future upgrades or integration into new developments.
T&D distribute Rotronic probes, instruments, transmitters, data loggers, indicators and sensors for the measurement of dew point, flow, air velocity, process pressure, carbon dioxide and temperature. Click an icon for further information.
 Low Dew Point |
 Flow & Air Velocity |
 Process Pressure |
 Carbon Dioxide |
 Temperature |
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ABOUT US
Thorne & Derrick International are your single-source supplier of Electrical, Mechanical, Process & Instrumentation Equipment. T&D provide an outstanding service to UK and international customers – we are highly customer responsive and absolutely committed to providing a world-class service.
T&D supply utilities, power, renewable energy, construction, rail, manufacturing, food/beverage, mining, oil, gas and petrochemical industries – distributing 100,000+ products from 100+ manufacturers from multi-million pound stocks. Since 1985 we have established a solid reputation based on service, integrity and trust.
Ashcroft Pressure Gauges – Pressure & Temperature Measurement Instrumentation
Ashcroft was founded in 1852 by Edward Ashcroft and has developed into the world leading designer and manufacturer of pressure gauges used in many applications and industries – their instrumentation gauges were originally designed to protect the steam powered industry at the start of the industrial revolution in Great Britain.
“A world where your people, processes and profits are never at risk because Ashcroft measurement instruments are on the job.”
The Ashcroft vision is cemented by their mission of constantly pushing the limits of innovation to consistently deliver the world’s most trusted pressure gauges and measurement instruments.
Ashcroft pressure gauges provide accurate, reliable performance throughout global process and industrial markets.
The range of Ashcroft Process Pressure gauges includes:
Pressure Gauges
Ashcroft are the leading pressure and temperature instrumentation manufacturer of pressure gauges, test gauges and temperature gauges across all industries.
Ashcroft Pressure & Temperature Instrumentation – 160 Years Of Know-How & Experience
Ashcroft protects assets and personnel in hundreds of countries – here are a few milestones in the Ashcroft company history:
Applications for Ashcroft pressure gauges are extremely diverse with their pressure and temperature instrumentation being used to reduce costs and maintain the highest standards of process safety and environmental protection.
Ashcroft provide process temperature and pressure measurement instruments for industries including oil and gas, offshore, petrochemical, waste water, paper/pulp, renewable energy, power plants and mining/minerals industries.
Call us for Ashcroft Pressure & Temperature Measurement Instruments and Gauges.
Typically, Ashcroft instruments are divided by their application into three categories: 1) industrial and life 2) food and beverage 3) medical services.
Within these areas, there are more specific industries and applications to choose from. All of which is designed to make selecting the correct pressure gauge as simple as possible.
Ashcroft pressure gauges and process instruments are designed to perform in harsh conditions and are often deployed in the the wellhead, offshore rig and shale field – this includes NACE compliant gauges, seals and SIL 3 capable switches.
Ashcroft provide pre-assembled gauges instrument/diaphragm seal combinations to ensure that corrosive caustics will not threaten any operation or personnel.
Within many industries, Ashcroft products provide filtration, pressure, flow and level measurement all requiring precise, continuous monitoring and control whilst also overcoming corrosive media, effluents, solids, vibration and pulsation. Constantly providing accurate measurements that prevent unplanned shutdowns and dangerous conditions.
Within the power industry, Ashcroft pressure gauges are used to help meet the demand for low energy prices, green energy production and a consistent, reliable service. The range of pressure measurement instruments have been developed to help sustain a power plant that is clean burning, efficient and in continuous service.
Ashcroft pressure gauges can monitor pressure levels in harsh environments and control pressure under the most extreme conditions. In hazardous area locations, safety is assured with Ashcroft explosion proof pressure switches certified to international hazardous Class/Division/Zone classifications.
Within the mining industry, Ashcroft products can help control damage before it occurs. Ashcroft focus is to protect lives, plant and equipment and countering everyday hazards that are naturally associated with this industry.
Purpose built pressure gauges for use in hazardous areas and destructive processes are suitable for use when dangerous gases are present and explosive atmospheres are commonplace. Even when monitoring the pressure of medias that are likely to clog a gauge, this can be overcome through an isolation ring, ensuring an uninterrupted process flow with continuously accurate measurements.
Pressure Gauges: NACE SIL ATEX CompliantFolllow Ashcroft on Twitter and LinkedIn for daily updates, new product information and discussions.
Ashcroft Pressure Gauges – Engage On Social Media Social
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Temperature & Humidity Measurement
Rotronic HygroFlex5-EX – ATEX Transmitters For Temperature & Humidity Measurement In Potentially Explosive & Hazardous Area Locations
Thanks to David Wyshnia (Area Manager, Rotronic Instruments Ltd) for this Guest Blog about the need for hazardous area certified ATEX transmitters, including the Rotronic HygroFlex5-EX in potentially explosive environments.
Transmitters
The oil and gas industries are obvious examples of where potentially explosive environments exist, but other industries have their own set of hazardous area conditions that need to be monitored and controlled using ATEX transmitters – suitably certificated temperature and humidity measurement sensors.
Fine particulates from sugar beet processing, wood dust, pharmaceutical powders and vapours from paint spraying processes are also examples of where equipment, including products designed and manufactured for “own” use, are not excluded from the requirements of the ATEX Directive.
In the Dangerous Substances and Explosive Atmospheres Regulations 2002 (DSEAR) an explosive atmosphere is defined as a mixture of dangerous substances with air, under atmospheric conditions, in the form of gases, vapours, mist or dust in which, after ignition has occurred, combustion spreads to the entire not burnt mixture.
Atmospheric conditions are commonly referred to as ambient temperatures and pressures.
That is to say temperatures of –20°C to 40°C and pressures of 0.8 to 1.1 bar.
The Swiss based company, Rotronic Instruments, have been manufacturing and supplying ATEX transmitters for hazardous area measurement of temperature and humidity levels for over 20 years.
The accuracy, durability and the reluctance of their probes to drift are seen as key attributes for companies who work in challenging conditions.
Rotronic’s new HygroFlex5-EX range of Wall and Duct mounted transmitters comply with all the current ATEX regulations. They have greatly simplified the installation and maintenance of ATEX equipment with galvanic separation and no need for an intrinsically safe power supply. Their “Hot Swap” probes also significantly reduce line downtime when probes require calibration, enabling the user to attach a replacement sensor in seconds without having to unwire / rewire the transmitter.
Hazardous Area Classification.
ATEX EX II 2(1) G Ex eb mb [ia Ga] IIC T5 Gb
ATEX EX II 2(1) D Ex tb [ia Da] IIIC T80°C Db
All probes have a working range of -40°C…+85°C / 0…100 %rh. The aluminium housing of the transmitter (with display) -10°C…+60°C.
ATEX transmitters are certified for safe use in hazardous area industries affected by potentially explosive atmospheres – typical dust hazards include:
Additional dust hazards from industrial processing include plastics, powder coatings, fertilisers, rubbers, elastomers, resins and synthetic adhesives – if in doubt about the specification or purchase of hazardous area transmitters or electrical products please contact T&D, we are Experts In Explosive Atmospheres.
| IEC Standard | EN Standard | Contents |
| IEC 60079-0 | EN 60079-0 | General requirements for equipment for use in explosive atmospheres with the presence of gas and dust |
| IEC 60079-31 | EN 60079-31 | Explosion Protection by enclosures “t” |
| IEC 60079-2 | EN 60079-2 | Explosion Protection by pressurization “p” |
| IEC 60079-11 | EN 60079-11 | Explosion Protection by intrinsic safety “i” |
| IEC 60079-18 | EN 60079-18 | Explosion Protection by encapsulation “m” |
There are a range of Rotronic probes available for the HygroFlex5-EX series to meet specific applications. Apart from the standard probe there are also cable probes with 2/5/10 metre cable lengths.
HC2-IM-EX Humidity & Temperature Probe
For processes that require humidity and temperature measurements under pressure the Rotronic HC2-IE-EX probe may be employed. Available with either ½”G or ½” NPT thread and with cable lengths of 2/5/10m the probe is pressure resistant to 100 bar / 1450 PSI.
HC2-IE-EX Humidity & Temperature Probe
To measure trace moisture in bodies such as gas pipes or compressed air systems the Rotronic HC2-LDP-EX provides highly accurate dew point and temperature measurement up to 100 bar.
HC2-LDP-EX Dew Point & Temperature Probe
Transmitters & Sensors – Zone 1, Zone 2 Zone 21 & Zone 22 Certified According To Hazardous Area ATEX Directive.
Layered on top of the DSEAR regulations are a company’s individual practices and processes which determine how often process instrumentation needs to be calibrated.
In order to be self-sufficient, whether from a geographical or process driven perspective, many companies have also taken on board the Rotronic HygroGen2 humidity and temperature generator. The HygroGen2 sets a new standard in terms of portable calibration.
The generator is not exclusively for use with Rotronic probes. Many different manufacturers’ instruments can be calibrated by use of interchangeable diameter port sleeves, clear acrylic and even custom made doors. The user simply enters the required temperature and humidity set points to build a calibration profile.
The range of the Rotronic Hygrogen2 is:
0….60°C (-5….60°C with optional range extension)
5….95 %rh (2….99 %rh with optional range extension)
Temperature control stability at equilibrium is better than ± 0.02 °C whilst humidity control stability is better than 0.1 %RH. Full details are available on the Data Sheet.
Rotronic HygroGen2 – Calibration of temperature and humidity instrumentation.
One of the main benefits of the Rotronic HygroGen2, when used in conjunction with Rotronic’s HC2 series probes, is the ability to automatically calibrate the probes (and adjust if required). The AutoCal feature also creates a PDF calibration certificate for each probe under test.
20 storable programmes each with 200 set points provide the flexibility to quickly recall standard profiles for efficient use. Humidity equilibrium between set points is typically achieved in around 5 minutes – a considerable time saving when compared to using calibration salts.
“The installation of the Rotronic ATEX transmitters on a blending suite was simple and the hot swap probes will virtually eliminate line downtime. The calibration of the probes is now so quick that we even adjusted them out, and back in, just to see how it would work and found the adjustments very logical and easy to complete. For us, these new probes along with the HydroGen2 chamber represent a huge step forward in the calibration of temperature and humidity instrumentation” – Dave Gregson, GlaxoSmithKline
HygroGen2 with AutoCal Function
At the very highest level of measurement such as National Standards Laboratories, MBW chilled mirror hygrometers are considered to be the most accurate, reliable and consistent humidity measurement technology available. They are a primary reference standard against which other sensors are calibrated.
As well as calibration laboratories, MBW chilled mirrors are used in oil and gas applications, chemistry laboratories and throughout meteorological, processing, manufacturing, engineering and storage industries across a dew/frost point range of -95°Cfp to +95°Cdp and pressures up to 200 bar.
Rotronic has worked closely with MBW, to integrate their products into the HygroGen2 portable temperature and humidity calibration system. Particularly well suited is the MBW 473 Dew Point Mirror, whose RP2 measuring head is designed to be directly inserted into the working volume of the Rotronic HygroGen2 chamber and work across its full range. Temperature and humidity probes from all manufacturers can be calibrated with typical expanded measurement uncertainty at ambient conditions of less than 0.7 %rh
➡ ATEX Certified Humidity & Temperature Sensors – Rotronic HygroFlex5-EX
➡ How Much Does It Cost If Your Production Capabilities Are Down For An Hour?
➡ Rotronic HygroClip – Relative Humidity & Temperature Measurement Module Explained
Rotronic HygroFlex5-EX – Hazardous Area Temperature Measurement ATEX Zone 1.Thorne & Derrick are inviting you to join LinkedIn’s fastest growing Discussion Group – Process & Hazardous Area Industries : Heat Tracing, Gas Detection, Fluid Control & Flow Measurement. News, projects, videos, promotions, whitepapers, jobs, webinars, press plus much more.
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