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TXgard Plus

Flameproof 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 or source - works with a wide selection of control panels
  • 3 wire format
  • Optional relays for alarm and fault - can be used for switching local alarms

Rugged and reliable

  • Constructed using marine-grade aluminium with a stainless steel sensor housing - proven track record for operation in the harshest environments
  • 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

  • Carbon Monoxide, Hydrogen Sulphide and Oxygen range of electrochemical sensors available

Contact [email protected] for more information.




Size 200 x 115 x 115mm (7.9 x 6.1 x 6.1ins)
Weight 2.2kg (4.9lbs)
Ingress protection IP65
Enclosure material Junction box: Marine grade alloy
Sensor housing: 316 stainless steel
Power 10-30Vdc, 210mA max (relay version)
160mA max (non relay)
Cable entries 2 x M20 or 1/2” NPT
Operating temperature -10°C to +55°C (-14°F to 131°F) *
Humidity 15 to 90% RH non-condensing
Relays (optional) SPNO or SPNC contacts rated 
30Vdc 1A (non-inductive load) for Alarm 1, Alarm 2, Fault
Display 3-digit LCD back-lit display, LED status indicator
Calibration method Via magnetically operated buttons
Electrical output 3 wire 4-20mA, sink or source
Terminals Suitable for up to 1.5mm2 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 1 or 2
Approvals Ex II 2 G
Exd IIC T6 Gb
UL Class I Zone 1
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
Carbon monoxide (CO) 100, 250, 500, 1000ppm
Hydrogen sulphide (H2S)          25, 50, 100, 200ppm
Oxygen (O2) 25% vol.






For a full list of gases download the datasheet or contact Crowcon.



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

Spray deflector


For use outdoor installations and to protect from water sprays, for example in water treatment or food processing plants. For extremely wet environments eg: offshore installations, use weatherproof cap, CO1442, instead.

Weatherproof cap


For offshore or other extremely wet environments in place of spray deflector.

Stainless steel flow adaptor


For use where a gas sample is being piped to the detector.

Exd Cable Gland Adaptors

ATEX certified Exd cable gland adaptors.

Exd/Exe Certified Brass Cable gland


Suitable for Steel Wire Armoured cables with outside diameter 15.5mm to 21.1mm (inner sheath 6.7mm to 14mm). Certified to ATEX (ll 2DG, Exd llC/Exe ll), IECEx, CSA, GOST-R and NEPSI standards. M20 x 1.5mm thread. Ingress protection to IP66/67/68.

Calibration adaptor


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

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