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Keep your employees and equipment safe with combustible, corrosive, and toxic gas alarms.

Otis Gas AlarmsGas alarms are used to detect and alert persons of the presence of corrosive and/or combustible gases including hydrogen sulfide (H₂S) and sulfur dioxide (SO₂), nitrogen dioxide (NO₂), and oxygen (O₂).

The alarms may be used in hazardous areas and can be integrated into Specific Systems® HVAC units even in Class I, Div 1, Groups B, C, & D environments.

Product Information

Use of gas alarms is often required in:

  • Refineries
  • Offshore faclities
  • Pharmaceutical production facilities
  • Textile facilities
  • Electric power distribution buildings (MCC, etc.) in various applications

Applications are available for single or multiple types of gases.

  • Pre-wired, installed, and are factory calibrated.
  • Another calibration may be necessary for individual environments and specifications.
  • Alarms are typically wired to shut down the HVAC and pressurization units and seal off the area from outside air via a damper.
  • Wired for high level, low level, and fail using Form C contacts allowing remote notification of the alarm.
  • Capable of non-intrusive calibration via the monitor, allowing the device to remain Class I, Div. 1, Group C & D certified during adjustment.
  • Catalytic bead or infrared technology with sensors mounted to meet the customer’s requirement.

Alarms are available to detect the presence of combustible gases such as hydrogen, carbon-based gases such as methane, and an abundance or shortage of oxygen. Also available are alarm systems for:

  • Smoke detection
  • Toxic gases
  • Corrosive gases such as H₂S, SO₂
  • Carbon monoxide (CO)
  • Others

Monitors are encased in NEMA 7 and NEMA 4X explosion proof housings and are CE and UL certified.


Combustible/Toxic Gas Detectors
Smoke Detection
Data Sheet Coming Soon

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