Air Safety

ST-48 Carbon Monoxide (CO) Gas Monitor

The carbon monoxide gas monitor is used for safety in laboratories, or facilities requiring the safety detection of CO. The CO gas detector comes with 2 alarm relays with signal to horn/strobe, building systems, etc. There are built-in visual alarms with bright LEDs, a 4-20mA analog output, and 24/7 supervised electronics which continuously checks the sensor.

  • CO, IPA, H2, H2S, and Other Toxic Gases
  • Dual Sensor Capability
  • Non-Intrusive One-man Calibration
  • Ex Proof Enclosure Div 1 & 2, Group B, C, & D
  • Local Digital Display with Bargraph & Trending
  • User Adjustable Dual Alarm Relays
  • 4-20 mA Analog Output
  • RS-480 Modbus Optional
  • NRTL CSA Approvals, ATEX Optional

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 PLCs, provides immediate fault identification for a disconnected sensor cell.

The AirCheck Ex is housed in a NEMA 7 explosion-proof enclosure and is available for Carbon Monoxide, IPA, H2, H2S, and other toxic gases. Capable of monitoring ppm levels of toxic gas or % LEL levels of combustible gases, the AirCheck Ex is a perfect monitoring solution for providing worker protection in chemical plants, refineries, and other areas requiring hazardous classifications.

Sampling Method
Gases Detected
Carbon Monoxide (CO)
Ethyl Alcohol (C2H5OH)
Hydrogen Sulfide (H2S)
Isopropyl alcohol (IPA)
Methyl Alcohol (MeOH)
0-100% ppm
± 10 % of Reading
Operating Temperature
-40 to +50 ºC
-40 to +122 ºF

• Refineries

• Natural Gas Operations

• Laboratories

• Parking Garages

• Oil and Gas

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