Crowcon Xgard ESU Environmental Sampling Unit

Code: C011004
  • Toxic or flammable gas detection
  • Low-cost solution
  • Available for 1 or 2 detectors

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The Crowcon Environmental Sampling Unit (ESU) is a unique product that provides a cost-effective solution for monitoring high-density gases such as chlorine, sulphur dioxide, and flammable vapours in environments where conventional sensors cannot be placed.

The sampling chamber is fitted with an electric fan, which draws an air sample via a pipe.

Xgard gas detectors are fitted to the chamber to monitor for flammable or toxic gases.

Low purchase and maintenance costs

  • The ESU is ideal for monitoring large enclosed areas such as chlorine stores. One unit can monitor up to 12 metres of pipe, eliminating the need for multiple sensors mounted at floor level.
  • Fewer sensors mean lower maintenance costs.

Adaptable installation options

  • The ESU is supplied with a range of accessories to suit any installation requirements. It can monitor from a single point, along an entire floor space, or even in areas subject to flooding, such as a wet well.
  • The ESU’s rugged design and high-impact ABS enclosure make it suitable for harsh environments.

Wide range of sensors

  • The ESU is used with Crowcon’s versatile Xgard detectors, which enable the monitoring of a wide range of gases.
  • A hazardous area certified version is available for safely monitoring flammable vapours.

High integrity design

  • The ESU is designed to connect to Crowcon’s class-leading Gasmaster or Vortex control systems. These systems display the gas level and monitor the ESU fan to ensure it has not slowed or stopped.
  • An alarm is raised in the event of a gas leak, fan blockage or fan failure.

Order Information

Safe Area ESU  
C011004 Xgard ESU for one detector.
C011031 Xgard ESU for two detectors.
Hazardous Area ESU  
Certified for use in Zone 1 or Zone 2 hazardous areas.
Fan certification: ATEX II 2 G – Ex m IIC T4
Fan junction box certification: ATEX II 2 G – Ex d IIC T6
C01987 Xgard ESU Ex, for one detector
C011029 Xgard ESU Ex, for two detectors
ESU Accessories
M04109 UPVC pipe 2″ NB x 2 metres
M04111 UPVC elbow 2″ NB
M04112 UPVC Tee 2″ NB
M04161 UPVC straight coupler 2″ NB
M04113 UPVC end cap, class D, 2″
M04167 Pipe clip – 2″ saddle type

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Title Size
Crowcon ESU Datasheet 102 KB

Additional information

Weight 0.190 kg


ESU Part Numbers Hazardous area certified ESU:
C01987 (for one sensor)
C011029 (for two sensors)
C011030 (for three sensors)
Non certified ESU (safe area):
C011004 (for one sensor)
C011031 (for two sensors)
C011032 (for three sensors)
Dimensions 397 (w) x 363 (h) x 180 (d) mm (15.3 x
10.6 x 7 inches)
Material Polycarbonate
Fan Power 3 Watts
Supply Voltage (Fan) 24v DC nominal from Gasmaster or Vortex
Operating Temperature -10 to + 50ºC (14 to 104ºF)
Approval Code (certified type only) Fan: ATEX II 2 G EEx m IIC T4
Fan junction box:
2 G EEx d IIC T6
Certificate Number Fan: Baseefa 03 ATEX 0033X
Fan junction box: Baseefa 04 ATEX 0024X
Piping 60mm Diameter PVC (2” pipe)
Maximum Pipe Length 12 Metres (36’)
Weight (excluding piping) 3.5kg (7.7 lbs) excluding gas detector
Accessories The ESU is supplied with a set of fittings comprising:
Retaining nut, washer and gasket for mounting the Xgard detector(s).
2 elbows,
2 end caps,
1 T-piece,
2 reducing bushes and
4 pipe clamps.
2” pipe is available separately in 2 metre lengths.

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