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The Nova 339 Methane Leak Detector has been designed for measuring the percent methane, natural gas or propane gas in air.  A sensitive but rugged infrared detector measures the methane or propane in air and displays the actual percentage by volume on a digital display.  This is an ideal method of measurement for leak detection because the sensor will not burn out or become 'blinded' as do some catalytic types.

The Model 339 had rechargeable battery operation and has no warm-up wait.  A built-in sample pump, hose, probe and flow indicator are also provided.  Built-in audible and visual alarms are included.  The alarm set point is field-adjustable.  LED lights tell when to recharge and verify recharging.  The recharger is included.

Unit of Measure


Method of Detection

N/A Infrared detector; cannot be burned out due to loss of flow or changing gases

Ranges Available

N/A 0-100.0% methane, natural gas or propane


N/A 0.1% methane, natural gas or propane

Accuracy & Repeatability

N/A ±1% of full scale


N/A ±1% of full scale per week

Response Time (T-90)

N/A 90% of final reading in 8-10 seconds

Ambient Temperature Range

N/A 12-50 ºC55-120 ºF


N/A ±2% of full scale

Size & Weight

N/A Approx. 10" L x 7 1/2: H x 6 1/2" D @ 8 lbs ( 25.5 x 19 x 16.5 cm @ 3.6 kg)


N/A AC/DC Operation. 115 VAC 60 Hz for recharging (220 VAC 50 Hz available)

Output Options

N/A 4-20 mA or 0-1 VDC


N/A Single audible & visual LED alarm with field-adjustable set point

Hazardous Area Rating Options

N/A General Purpose/Non-hazardous


N/A For checking for methane, natural gas or propane gas leaks from pipelines, tanks or apparatus.



  • Rugged design that is easy to operate
  • Fast warm-up and response
  • Long life infrared detector that provides accurate and stable readings
  • Digital meter readout with backlight
  • Cannot be 'blinded' by high concentrations
  • Rechargeable battery operated
  • Built-in sample pump
  • LIghtweight, compact, and easy to use
  • Weatherproof (WP) cabinet with clear lexan cover

  • Options


  • Recorder outputs of 0-1V or 4-20 mA
  • Suitcase(K) style cabinet available
  • AC only power operation
  • Gas alarm with LED
  • Detachable/portable datalogger

  • Calibration


  • Ambient air for zero
  • 100% methane, propane or natural gas for span

  • Unique Applications

    N/A Operator should observe all local safety procedures when sampling potentially hazardous or flammable vapors.

    All Nova analyzer are built using proven technologies and techniques. If this product does not suit or application, please contact Nova at 1-800-295-3771. In many cases, we are able to build an analyzer specific to your needs.

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