Crowcon TXgard-IS+ Gas Detector

Crowcon TXgard-IS+ Gas Detectors

Crowcon TXgard-IS+ Gas Detector – call T&D Sales for price, delivery and stock.

Fixed Gas Detectors

Crowcon TXgard-IS+

Single Gas & Multi-gas Detectors | Fixed Point Gas Detection & Portable Gas Safety Applications | Industrial Locations & Hazardous Area Zones

Crowcon TXgard-IS+ | ATEX Zone 0, Zone 1 & Zone 2

TXgard-IS+ manufactured by Crowcon, is a fixed gas detector that is ATEX certified for use in Zone 0, Zone 1 or Zone 2 hazardous areas. The Crowcon TXgard-IS+ is intrinsically safe and is UL and cUL certified for gas detection in Division 1 or 2 hazardous areas.

Crowcon TXgard-IS+ has a wide selection of sensors including a number of catalytic beads for a wide selection of flammable gases and vapours as well as electrochemical sensors for toxic gases and oxygen.

The Crowcon TXgard-IS+ gas detector is easy to calibrate, maintenance and operation are simple and the long life sensors keep disruption to site to a minimum.

Crowcon TXgard-IS+ has an ingress protection to IP65 as a standard.

Crowcon TXgard-IS+ Gas Detector

Crowcon TXgard-IS+ Gas Detector – Intrinsically safe (Ex i) toxic and oxygen gas detector with local LCD display

Crowcon TXgard-IS+

Key Features

Should you require any further technical support and specification advice about the TXgard-IS+ manufactured by Crowcon please do not hesitate to contact us.

Carbon Monoxide Gas Detectors

Intrinsically Safe (Ex i) Toxic & Oxygen Gas Detector

  • Robust Construction – Crowcon TXgard-IS+ is constructed from tough carbon loaded nylon and an IP65 rating as standard.
  • Flexible Options – The TXgard-IS+ is available in 2 or 3 wire formats with a 40-20mA current sink or source. Relays for alarm and fault are also options.
  • Low Ownership Costs – Sensors are long life with simple part replacement making the gas detector easy to operate and maintain.
  • Calibration – The TXgard-IS+ can be calibrated with ease and boasts local display and buttons so the junction box doesn’t need to be opened. Non-intrusive one man calibration can be performed locally without the need for hot work permits.
  • Range of Sensors – This gas detector can be tailored to meet the user’s needs with a choice of catalytic beads for a wide selection of flammable gases and vapours and an extensive range of electrochemical sensors for toxic gases and oxygen.

Crowcon TXgard-IS+

Bump Testing And Calibration

Routine bump testing is recommended for the range of Crowcon fixed gas detectors prior to each use. Bump testing is a brief application of a gas to the sensor to invoke a prescribed reaction, ensuring the gas detector reacts as expected.

Bump testing provides a quick, easy and direct method of verifying gas detectors are performing as required and takes a lot less time than ‘zeroing’ the device.

The bump test is widely accepted as a suitable method of testing gas detection equipment.

Crowcon TXgard-IS+

Product Specifications

The Crowcon TXgard-IS+ is available from stock at competitive prices from Thorne & Derrick – should you require technical advise about specifying or purchasing either Fixed or Portable Gas Detection Equipment please do not hesitate to contact us.

Size 160 x 123 x 92mm (6.3 x 4.8 x 4.5ins)
Weight 0.7kg (1.5lbs)
Enclosure material Junction box: Carbon loaded nylon Sensor housing: ABD Plastic
Ingress Protection IP65
Cable entries 1 x M20 or 1/2” NPT with adaptor
Power 8-32Vdc, 4-20mA loop-powered
Operating temperatures -20o C to +55o C (-4o F to 131o F) *
Humidity 15 to 90% RH non-condensing
Relays (optional) N/A
Display 2-Line, 16 character LCD
Calibration method Via push-buttons
Electrical output 2 wire 4-20mA
Terminals Suitable for up to 2.5mm2 cable
Sensor type Electrochemical
Repeatability +/- 2% FSD typically
Zero drift +/-2% FSD, 6 months typically
Response time Contact
Hazardous area zones Zone 0, 1 or 2 Division 1 or 2 (when connected via an isolation device)
Approvals Ex II 1 G Ex ia IIC T4 Ga UL Class I, groups A, B, C and D
EMC compliance EN50270, FCC, ICES-003
Crowcon TXgard-IS+ Fixed Gas Detector | Gases And Ranges Detected

TXgard-IS+ detects an extensive range of toxic, flammable and oxygen gases:

Gas Type LTEL (ppm) STEL (ppm) Crowcon TXgard-IS+ Range Available
NHAmmonia  25 35 50, 100, 1000ppm
CO Carbon monoxide 30 200 250, 500ppm
CLChlorine  0.5 5, 10, 20ppm
CLOChlorine dioxide 0.1 0.3 1 ppm
H2 Hydrogen 2000ppm, 50% LEL, 100% LEL
HCN Hydrogen cyanide 10 (MEL) 25ppm
HF Hydrogen fluoride 1.8 3 10ppm
H2S Hydrogen sulphide 5 10 25, 50, 100, 200ppm
NONitrogen dioxide 1 1 10ppm
OOzone 0.2 1ppm
OOxygen 25% vol.
COClPhosgene 0.02 0.06 1ppm
PHPhosphine 0.1 0.2 2ppm
SOSulphur Dioxide 1 1 10, 20, 30ppm


Crowcon Txgard-IS+ - Certification Rating

Crowcon Txgard-IS+ Certification Rating

Crowcon TXgard-IS+  Hazardous Area ATEX Certified Gas Detector

Hazardous Area Classification

Ex II 1 G Ex ia IIC T4 Ga
UL Class I, groups A, B, C and D

Crowcon TXgard-IS+ is an ATEX certified gas detector for use in Zone 0,1 or 2 hazardous areas – also UL and cUL certified for use in Division 1 or 2 hazardous areas.

Crowcon TXgard-IS+ Gas Detector

Crowcon TXgard-IS+ Gas Detector

Visit hazardous area gas detectors for explosion and flameproof gas monitoring and detection instruments with certification for potentially explosive atmospheres, including Zone 1 and Zone 2 (according to ATEX and IECEx) and Class/Division categories (according to North American standards).

T&D provide competitive prices and delivery for all Crowcon Gas Detectors, including the Crowcon TXgard-IS+.

Did you know? Crowcon fixed gas detectors protect plant; portable gas detectors protect people.


T&D Sales Team are Certificated by Crowcon to support the specification and supply of their flammable and toxic gas detectors. Additionally, T&D are CompEx Certificated and competent in understanding hazardous area classifications and site requirements for the sale of explosion and flameproof equipment.

Data Sheets