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ST-48 Combustible Gas Monitor – Ethanol

Item #: 95125


Product Summary

The Air Check Explosion Proof Combustible Gas Monitor is ideal for facilities that require continuous monitoring of Ethanol and Alcohol based products. The enclosure is specifically designed to prevent an explosion. The monitor is well suited for environments such as Hand Sanitizer locations, Ethanol plants, combustible gas locations requiring LEL gas analyzers, chemical plants, and where air sampling is required for combustible gases in vessels under a nitrogen blanket. The monitor is housed in a NEMA 4 explosion-proof enclosure suitable for Class 1, Group B, C, and D, Class 2, Group E, F, and G. PureAire’s durable, long-life LEL catalytic sensor will last 5-6  years in a normal environment without needing to be replaced.

  • LEL Combustible Gas Analyzer with 0-100% or 0-4% of LEL
  • Designed for Combustible Gases including Alcohol-Based Products
  • Gas Sampling for Vessels or General Safety with Wall Mount
  • Explosion-Proof Enclosure
  • Non-Intrusive Calibration
  • Local Digital Display
  • 4-20 mA Analog Output
  • 2 Configurable High/Low Relays
  • Long Life LEL Catalytic Sensor Average, 5-6 years

The AirCheck LEL gas detector is housed in a Nema 4 Explosion Proof Enclosure and is available for Ethane, Ethanol, or Alcohol. Capable of monitoring the percentage of LEL combustible gas, the AirCheck Ex is a perfect monitoring solution for providing worker protection in had sanitizer plants, retrofitted refineries or distilleries, and other areas requiring hazardous classifications for alcohol-based products. Commonly paired with oxygen sensors for vessels under Nitrogen, the ethanol sensor can be used for ethanol vessels or for safety nearby for employee protection.

The instrument’s fault supervision circuitry continuously monitors for failed sensor cell and communication. Our sensor cell operation is continuously supervised 24/7, and when used with distributive control systems or PLC’s, the monitor provides immediate fault identification.


Sampling Method Diffusion Cell
Gases Detected 1 Ethanol (C2H5OH)
Ethane (C2H6)
Ethyl Alcohol (C2H5OH)
Ethylene (C2H4)
Isopropyl alcohol (IPA)
Methyl Alcohol (MeOH)
Accuracy ± 1 % 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 5.12 in
130.05 mm
Height 5.0 in
127 mm
Depth 8.0 in
203.2 mm
Weight 4.7lb
2.1 kg
Enclosure NEMA 4 Explosion Proof Suitable for Class 1, Group B, C, & D

1 Contact PureAire for a complete list of detectable gases
2 48 V DC, 3 Wire Available for LEL and Hydrocarbon Gases

Additional LEL Monitor Accessories List Price
8 Channel Controller $2,595.00 US (P/N # 99058)
Horn and Strobe  $160.00 US (P/N # 42002)
Remote Display $375.00 US (P/N # 99091)

Self-Supervised Operation
The PureAire AirCheck Ex incorporates sophisticated electronics that, 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 AirCheck Ex outputs a 0 mA signal to remote alarm/control systems to immediately alert control room personnel.

Air Check LEL Combustible Gas Monitor Literature

ST-48  Manual 

Gases Detected with PureAire Monitors

LEL Combustibles Layout 

LEL Monitor Layout 

LEL Monitor with Fan Relay