TXgard Plus


PLEASE NOTE: This product is now obsolete

Effective 15th of March 2024 TXgard Plus and Flamgard Plus will no longer be available.

As an alternative solution, we recommend exploring the Xgard Bright range of fixed gas detectors. This series not only offers enhanced features but also serves as a direct replacement for TXgard Plus and Flamgard Plus variants.

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 providing reliable oxygen, toxic and flameproof gas detection, even in the harshest of 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

  • A range of carbon monoxide, hydrogen sulphate and oxygen electrochemical sensors available for toxic and oxygen gas detection



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
Ex db IIC T6 Tamb -20°C to +55°C
EMC compliance EN 50270, FCC: CFR 47 Part 15, 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 TXgard Plus.

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.


Product Obsolescence Notice