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GIR902 NOVA-Sensor Elite™ IR Combustible Gas Detector

Product Literature

The Model GIR902 has been replaced by Model GIR904.

Features and Benefits

  • Infrared Sensor for combustible gas detection
  • Features 4-20 mA output signal, 2 dry contact relays, bright LCD display of gas concentration in % LEL
  • Explosion-proof
  • User programmable LOW Alarm and HIGH Alarm settings
  • Can be installed as a standalone device or connected to a control panel
  • Requires less maintenance than catalytic sensors
  • The IR sensor does not degrade when exposed to gas
  • Immune to contamination and poisoning
  • Optional remote sensor available for mounting in hard to reach places and high ceilings
  • Shipped fully assembled and pre-calibrated
  • Pushbutton switch initiates test or calibration verification (no magnet required)
  • On-screen test instructions insure error-free results
  • No moving parts or mirrors used
  • Accurately detects gas in locations with no oxygen present
  • Maintains calibration even after exposure to high gas concentrations or continuous background of gas
  • Available accessories include duct mounts, collection cone, and power supplies
  • 5 Year Warranty
  • Made in the USA
  • Suitable for Class I Division 1 Groups B,C,D locations
  • For Methane Gas Detector, order part no. 902-02
  • For Propane Gas Detector, order part no. 902-03
  • For Butane Gas Detector, order part no. 902-05
  • For other combustible gases, please see datasheet

Product Summary

Our latest infrared intelligent model combustible gas detector.  GIR902 NOVA-Sensor Elite™ Infrared Combustible Gas Detector is a completely self-contained device that measures and displays the concentration of gas accumulated in a protected area, performs local control functions, and optionally transmits this information to a central control point. The SST Combustible Gas NOVA-Sensor ELITE uses the non-dispersive infrared (NDIR) principle to detect and monitor the presence of gas.  Features include bright LCD display of gas concentration in % LEL, 4-20 mA output signal, dry contact relays, and on-screen calibration instructions.  Typical gases:  methane, propane, butane, ethane, pentane, hexane, hydrogen, heptane, octane, acetone; ethanol, toluene, ethylene oxide, and cyclohexane. 5 Year Warranty.  Made in the U.S.A.


Use the NOVA-Sensor Combustible Gas Detector to alert personnel when a flammable gas or vapor is accumulating in a protected area. This detector uses the nondispersive infrared (NDIR) principle to detect and monitor the presence of gas.

The display screen on the NOVA-Sensor continuously displays operating status and the actual concentration of gas in percentage of the Lower Explosive Limit (%LEL). This reading is converted to a standard 4-20 mA signal, which may be connected to any remote device for remote display or logging.  Relay contacts are provided which transfer when the gas concentration exceeds the LOW ALARM and HIGH ALARM set points. Typical set points are adjusted by the
installer upon installation and may be reset later by authorized personnel. The relays are
suitable for controlling local HVAC equipment, alarm signal devices or for equipment shutdown. Fault relay contacts are also available which operate upon loss of power or internal failure of the unit.

The calibration verification or test sequence is initiated by depressing the pushbutton switch located on the side of the enclosure. During calibration/test, step-bystep instructions are displayed on the NOVA-Sensor screen. There are no
screwdriver or other manual adjustments required, and the calibration can be performed even in the presence of combustible gases.

Architect's and Engineer's Specifications

Combustible gas sensing capability shall be provided by infrared gas sensors, contained in explosion proof housings. The sensor shall include a microprocessor based control electronics which converts the measured gas concentration in percent LEL to the industry standard 4-20 mA signal, plus alarm and fault relay outputs. A continuously reading digital display shall be provided on the sensor, capable of displaying sensor status in the current LEL reading. A switch for initiating sensor calibration shall be provided. Calibration shall not require any operator adjustment. All calibration data shall be stored in non-volatile memory in the sensor. Relay and analog outputs shall normally be inhibited during calibration; however, it shall be possible for the calibrating technician to selectively enable outputs when desired. The sensor shall be suitable for offshore use, and the manufacturers data shall so state. Safety Systems Technology Model GIR902 Combustible Gas NOVA-Sensor® ELITE, or approved equivalent, shall be supplied.

Technical Specifications and Ordering Information

Technical Specifications

Power Input: 24 volts DC nominal, 180 mA standby, 240 mA in alarm Will operate within specifications at any supply voltage between 16 and 32 volts.
Operating Temperature: -4 to +122° F (-20 to +50° C)
Relative Humidity: 0 to 95% non-condensing
Ingress Protection: IP40 to IP66
Signal Output: 0.16 mA per % LEL
Automatically adjusted during calibration
Resolution: 2% LEL
Repeatability: Zero: ±0.1% of full scale
Signal: ±0.05% of full scale
Warm-up Time: 6 minutes after power applied
T90 Response Time: Less than 30 seconds
Maintenance Interval: 3 months (for verification of performance only)
Relay Ouputs: Low Alarm (latching or nonlatching)
High Alarm (latching)
Malfunction (non-latching)
Relay Contact Ratings: 6 amps @ 28 VDC or 300 VAC resistive
1/8 HP @ 120/240 VAC

Ordering Information

902-2 Model GIR902 Infrared Methane Gas NOVA-Sensor® ELITE with 4-20 mA output, alarm and fault relays