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GC802 NOVA-Sensor Elite™ Catalytic Combustible Gas Detector

Product Literature

  • The Model GC802 has been replaced by Model GC804.

Features and Benefits

  • A stand-alone, explosion-proof, catalytic combustible gas detector
  • 4-20 mA output for connection to external equipment
  • Two alarm set points with voltage-free contact relay outputs for local control
  • Bright LCD display of gas concentration in % LEL
  • Reliable, easy to install. simple to maintain and operate
  • The catalytic sensor responds to all hydrocarbon combustible gases
  • The sensor can be calibrated to specific combustible gases such as methane, propane, butane, hydrogen, gasoline, ethanol, and other combustible gases and vapors
  • Epoxy coated copper-free aluminum housing
  • Explosion-proof approved housing
  • Shipped fully assembled and pre-calibrated
  • Installed and fully operational in less than 1 hour
  • Pushbutton switch initiates test or calibration sequence (no magnet required)
  • On-screen calibration instructions insure error-free results
  • Available up to IP66 rating
  • Suitable for Class I Division 1 Groups B,C, D locations
  • 5 Year Warranty
  • Made in the USA
  • Optional remote sensor available for mounting in hard to reach places and high ceilings
  • Sensor can be installed to monitor air flowing through duct with the optional duct mounting accessory
  • For Methane Gas Detector, order part no. 802-02
  • For Propane Gas Detector, order part no. 802-03
  • For Hydrogen Gas Detector, order part no. 802-04
  • For Ammonia Gas Detector, order part no. 802-083
  • For other combustible gases, please see the datasheet

Product Summary

Our latest intelligent model combustible gas detector.  Features a rugged, explosion-proof, and self-contained device with a bright LCD screen displays gas concentration in % LEL, 4-20 mA output, dry contact relays, and on-screen calibration instruction.  The catalytic gas sensor responds to all hydrocarbon combustible gases such as methane, propane, butane, ethane, pentane, hexane, hydrogen, heptane, octane, ammonia, gasoline (petrol), acetone; ethanol, toluene, iso propyl alcohol, cyclohexane, methyl ethyl ketone, hydrocarbon vapors, and ethyl acetate.  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 a catalytic poison-resistant sensing element, and provides accurate measurements in atmospheres where traces of silicone or other poisoning agents may be present. Readings are unaffected by humidity or carbon dioxide.

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 automatic calibration sequence is initiated by depressing the pushbutton switch located on the side of the enclosure. During calibration, step-by-step 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.

Typical gases for pre-calibrated NOVASensor Combustible Gas Detectors include:

Methane (CH4)
Iso Propyl Alcohol
Methyl Ethyl Ketone
Ethyl Acetate
Gasoline (Petrol)

Technical Specifications and Ordering Information

Technical Specifications

Power Input: 24 volts DC nominal, 92 mA standby, 120 mA alarm Will operate within specifications at any supply voltage between 16 and 32 volts. Operating Temperature: -40 to +131° F (-40 to +55° C) Relative Humidity: 0 to 100% non-condensing
Ingress Protection: IP40 to IP66 Depends on installed protection options
Sensitivity: 0.16 mA per % LEL Automatically adjusted during calibration T90 Response Time: Less than 15 seconds
Accuracy: Linear response between 0 and 100% LEL Zero/Span drift less than 2% per month.
Relay Outputs: Low Alarm (latching or non-latching) High Alarm (latching) Malfunction (non-latching)
Relay Contact Ratings: 6 amps @ 28 VDC or 300 VAC resistive 1/8 HP @ 120/240 VAC
Analog Output: 0 to 20 mA into a load of 600 ohms or less
Size: 7 x 7 inches, 4.75 inches deep (178 x 178 x 121 mm) Includes junction box and sensor. Conduit connection is ¾ inch NPT thread.
Weight: 4.75 pounds (2.15 kg)

Ordering Information

802-2 Model GC802 NOVA-SensorElite™ Combustible Gas Detector with sensing head