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Product information

  • Product: Crowcon
  • Category: Fixed Gas Detectors
  • Product URL: TXgard Plus

TXgard Plus Fixed Point Gas Detector

TXgard Plus is a flameproof (Ex d), ATEX and UL certified toxic or oxygen gas detector with local LCD display. A choice of sensors are available enabling use in a wide range of applications, including water treatment, oil and gas exploration, chemical plants and steel production.

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


Size 200 x 115 x 115mm (7.9 x 6.1 x 6.1ins)
Weight 2.2kg (4.9lbs)
Display 3-digit LCD back-lit display, LED status indicator
Environment Operating Temperature: -10°C to +55°C (-14°F to 131°F)
Ingress Protection: IP65
Humidity: 15 to 90% RH non-condensing
Approvals Ex II 2 G
Exd IIC T6 Gb
UL Class I Zone 1
Enclosure material Junction box: Marine grade alloy
Sensor housing: 316 stainless steel
Power 10-30Vdc, 210mA max (relay version)
160mA max (non relay)
Electrical output 3 wire 4-20mA, sink or source
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
EMC Compliance EN 50270, FCC, ICES-003
Cable entries 2 x M20 or 1/2” NPT
Relays (optional) SPNO or SPNC contacts rated 30Vdc 1A (non-inductive load) for Alarm 1, Alarm 2, Fault
Calibration method Via magnetically operated buttons
Terminals Suitable for up to 1.5mm2 cable
Sensor type Electrochemical
Hazardous area zones Zone 1 or 2


Certificate Datasheet Manual
ATEX Certificate TXgard Plus – European English Txgard Plus Manual (Issue 6 Apr 18)
ATEX Certificate – 96HD Sensor TXgard Plus Manual – Italiano (Issue 4 – Jan 13)