Need Help? Call +44 (0)1235 557700

Find the right product

for your gas detection needs


Toxic and oxygen gas detector with display


Non-intrusive calibration

  • Calibration can be performed locally without the need for hot work permits - minimises operational down-time
  • Local display and buttons enable calibration without opening the junction box

Flexible output options

  • 4-20mA current sink - works with a wide selection of control panels
  • 2 wire format

Rugged and reliable

  • Made from tough carbon loaded nylon
  • Ingress protection to IP65 as standard

Low cost of ownership

  • Non-intrusive one man calibration - easy to operate and maintain
  • Long life sensors - keeps interuption to on-site activity to a minimum
  • Simple parts replacement

Wide range of sensors

  • Extensive range of electrochemical sensors for toxic gases and oxygen

Contact [email protected] for more information.



Size 160 x 123 x 92mm
(6.3 x 4.8 x 4.5ins)
Weight 0.7kg (1.5lbs)
Ingress protection IP65
Enclosure material Junction box: Carbon loaded nylon
Sensor housing: ABD Plastic
Power 8-32Vdc, 4-20mA loop-powered
Cable entries 1 x M20 or 1/2” NPT with adaptor
Operating temperature -20°C to +55°C (-4°F to 132°F) *
Humidity 15 to 90% RH non-condensing
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 Crowcon for a full list of sensor response times
Performance Tested in accordance with EN60079-29-1
Hazardous area zones Zone 0, 1 or 2
Division 1 or 2
(when connected via an isolation device)
Approvals Ex II 1 G
Exia IIC T4 Ga
UL Class I, groups A, B, C and D
EMC compliance EN 50270, FCC, ICES-003

* Figures shown exclude the sensors - Please contact Crowcon for a full list of sensor operating temperatures


Gases and Ranges

Gas Range Available
Ammonia (NH3) 50, 100, 1000ppm
Chlorine (Cl2) 5, 10, 20ppm
Carbon monoxide (CO) 250, 500ppm
Chlorine dioxide (ClO2) 1ppm
Hydrogen (H2) 2000ppm, 50% LEL, 100% LEL
Hydrogen cyanide (HCN) 25ppm
Hydrogen sulphide (H2S)     25, 50, 100, 200ppm
Hydrogen fluoride (HF) 10ppm
Nitrogen dioxide (NO2) 10ppm
Oxygen (O2) 25% vol.
Ozone (O3) 1ppm
Phosgene (COCl2) 1ppm
Phosphine (PH3) 2ppm
Sulphur dioxide (SO2) 10, 20, 30ppm


Below is a small selection of the accessories available for the Crowcon TXgard-IS+. For a full list please call 01235 557700 or Contact Us.

Spray deflector


For outdoor installations and protection from water sprays, for example in water treatment or food processing plants. Includes accessory adaptor. (not suitable for use with Xgard Type 4)

Flow adaptor


For applications where gas is being sampled via a pipe or tube.

Stainless steel duct mounting plate


For GRP junction boxes. Maximum duct airflow: 6 metres per second. Use TXgard-IS+ detector with side-entry.

Calibration adaptor


To enable calibration gas to be applied to the detector. One adaptor can be used for several detectors.

Cable gland


M20 Nylon. Fits Txgard-IS cable entries.

Related Products

Sorry, you cannot add this product because...

  1. It belongs to a different category to the products you are already comparing or...
  2. You are already comparing the maximum of 3 products