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Gas sensor modules with a performance difference. Sierra Monitor gas sensor modules provide continuous trouble-free monitoring of hazardous gas conditions to protect your personnel and facility. Sierra Monitor integrates extensive gas sensor technology with electronics expertise to offer a broad line of diffusion gas sensor modules. The modules condition the sensor signal and provide an industry standard 4-20 mA output that can interface with single or multichannel controllers and distributed control systems. Sierra Monitor employs catalytic bead, electrochemical, semiconductor and infrared technologies to match the appropriate sensing technology with the application requirement.

Also check out the IT Series smart gas sensor modules

Analog Gas Sensor Modules These modules provide a 4-20 mA signal of gas concentration for combustible gases, oxygen and toxic gases and can interface to an SMC single channel controller or other devices
4101 Series	Standard gas sensor module with 4-20 mA output
4105 Series	In addition to 4-20 mA output, includes Digital Display of gas concentration and non-intrusive calibration
4107 Series	In addition to 4-20 mA output, Digital Display and non-intrusive calibration, the 4107 adds 5 amp relay contacts for high, low and trouble alarms, an enhanced 2-line/16-character digital display for gas concentration, engineering units and name, plus bi-directional serial Modbus RTU output.
4501 Series	2-wire, 4-20 mA loop-powered gas sensor modules
IT Series	Intelligent Technology series with integral menu-driven scrolling LED display, long frequency intervals, integral relays, Sentry output, 4-20 mA output, Modbus interface
Specialty Analog Gas Sensor Modules
4100 Series	Solid-state sensors used for combustible gas (ppm) and carbon monoxide gas detection
Single Channel Controllers Accept the 4-20 mA signal from the analog gas sensors and provides digital display, LED alarm display and relay contacts (low alarm, high alarm and trouble)
4001 controller	Controller in a NEMA 4X wall-mount enclosure
4011 controller	Controller in a 1/8 DIN panel-mount enclosure

Features provided on Sierra Monitor gas sensor modules include:

Reliability you can count on – Sensor design and electronic conditioning are carefully matched to maximize output signal integrity. All gas sensor modules are designed for hostile or hazardous environments and key sensors are FM approved.

Automatic low sensitivity check to ensure monitoring integrity – after calibration a sensor sensitivity check on many models confirms sufficient sensor response.

Convenient diagnostic measurements – from convenient jacks on the 4101 series to keypad accessible information on the 4105 and 4107 series, the Sierra Monitor gas sensor modules provide the diagnostics necessary to ensure successful operation.

False alarm avoidance – during power-up and calibration on many models the output is logged at 4 mA to avoid erroneous readings.

Simple zero and span adjustments – featured on all Sierra Monitor gas sensor modules, using easily accessible potentiometers on 4101 series to keypad accessible adjustments on 4105 and 4107 series.

Non-intrusive calibration – the Model 4105 and 4107 series offer non-intrusive calibration.