General Monitors offers combustible gas monitoring controllers for harsh use

Two combustible gas-monitoring controllers from General Monitors are designed to provide fixed-point combustible gas detection in harsh areas.


Models 480A (single-channel) and 580A (dual-channel) controllers from General Monitors continuously monitor combustible gas concentrations in the 0-100% LEL (lower explosive limit) range.

Two combustible gas-monitoring controllers from General Monitors are designed to provide fixed-point combustible gas detection in harsh areas. Models 480A (single-channel) and 580A (dual-channel) continuously monitor combustible gas concentrations in the 0-100% LEL (lower explosive limit) range and are factory calibrated to a particular gas or vapor. Simple, adjustment-free calibration reduces set-up and installation time.

Controllers are said to be particularly suitable for rugged or dirty environments to support oil and gas applications, including production, refining, distribution, and storage. They also are said to perform well in chemical processing plants where they support the production of automotive fluids, plastics, paints, and solvents. Other applications include gas turbines for electric power generation and sewage treatment plants.

Devices use continuous diffusion, electro-catalytic bead sensing technology to operate over wide temperature and humidity ranges. Sensors function on the principle that a combustible gas can be oxidized to produce heat, resulting in a temperature change that is converted to a signal over a standard Wheatstone Bridge temperature transducer, with the change in temperature being directly proportional to the gas concentration.

Both models feature a digital LED display along with LED indicators to provide visual indication of alarm, fault, and status. Mode and reset buttons are provided for local control. Systems operate on 117 V ac, 50-60 Hz (optional 220 V ac, 50-60 Hz) or 24 V dc primary input power with 24 V dc battery back-up capability. Controllers can be wall, panel, or rack mounted in a non-hazardous area; both are CSA approved.

—Jeanine Katzel, senior editor, Control Engineering,

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