LEL combustible

Combustible Gas Monitor

Item #: EX-2300, 95105


Product Summary

The Air Check Ex Combustible Gas Monitor is a gas monitor or gas detector for continuously monitoring combustible gases. The Air check Ex LEL ( Lower explosive limit) can be used for hydrogen (H2), natural gas (CH4), acetylene, and other various combustibles. The product uses a 4+ year sensor and requires low maintenance.

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The instrument’s fault supervision circuitry continuously monitors for failed sensor cell and communication line breaks. Plus sensor cell operation is continuously supervised 24/7 and when used in conjunction with distributive control systems or PLC’s, provides immediate fault identification for a disconnected sensor cell.

The Air check LEL gas detector is housed in a Nema 4 explosion proof enclosure and is available for hydrogen gas. Capable of monitoring the % LEL combustible gases, the Air check Ex is a perfect monitoring solution for providing worker protection in chemical plants, refineries and other areas requiring hazardous classifications.

  • LEL Combustible Gas Monitor with 0-100% Range
  • Non-Intrusive One-man Calibration
  • Ex Proof Enclosure
  • Designed for Combustible Gases
  • Local Digital Display
  • 4-20 mA Analog Output
  • Long Life LEL Catalytic Sensor
Sampling Method Diffusion Cell
Gases Detected 1 Ethane (C2H6)
Ethyl Alcohol (C2H5OH)
Ethylene (C2H4)
Isopropyl alcohol (IPA)
Methane (CH4)
Methyl Alcohol (MeOH)
Xylene ((C6H4(CH3)2)
Accuracy ± 10 % of Reading
Operating Temperature -32 to +50 ºC
-25 to +122 ºF
Display 3 1/2″ Digit LCD Digital Display
Sensor Type LEL Catalytic Bead
Sensor Life 2 to 5 years under Normal Conditions
Signal Outputs 2 alarm relays, 4-20 mA analog output, and fault relay
Power Requirements 2 24 VDC
3 Wire
Width 5.3 in
135 mm
Height 6.125 in
156 mm
Depth 4.61 in
117 mm
Weight 4.0 lb
1.8 kg
Enclosure Nema 4 Explosion Proof Suitable for Class 1, Group B,C, & D

1 Contact PureAire for more gases
2 48 V DC, 3 Wire Available for LEL and Hydrocarbon Gases.

Self-Supervised Operation
The PureAire Air check Ex incorporates sophisticated electronics which, when used in conjunction with distributive control systems or PLC’s enable you to quickly identify and correct major system faults. These enhanced self-diagnostic capabilities include missing cell and broken transmitter wiring. Should a system error occur, the Air check Ex outputs a 0 mA signal to remote alarm/control systems to immediately alert control room personnel.

Air Check LEL Combustible Gas Monitor Literature

Air Check EX LEL Manual 

LEL Combustibles Layout 

LEL Monitor Layout 

LEL Monitor with Fan Relay