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The Nova 380 Series Tri-Gas Analyzer is designed for monitoring H2 purity inside a power generator and to monitor the purging procedure during a generator shut down or start up.

The analyzer contains a temperature compensated thermal conductivity (T/C) cell, amplifier board, digital readout, range switch, pressure regulator, gas flow control valve, pump and a flow indictor. A recorder output is optional.

The T/C cell does not burn the sample nor is it consumed in any way, so it has a life expectancy of over 10 years. Measurement results are fast and accurate. A rechargeable 'gel cell' battery provides enough power for about 8 hours of continuous operation and the analyzer can be used while it is being recharged.

Unit of Measure

Method of Detection

N/A Temperature compensated thermal conductivity (T/C) cell

Ranges Available

N/A Range 1 : 0-100% H2 in Air Range 2 : 0-100% H2 in CO2 Range 3 : 0-100% Air in CO2


N/A 0.1% of gas measured

Accuracy & Repeatability

N/A ±1% F.S except in 85-100% H2 in Air range, which is within 0.5% absolute H2


N/A 0-100% H2 in Air range is ± 0.4% per week H2 in CO2 or Air in CO2 2% F.S. per week maximum drift

Response Time (T-90)

N/A 10-15 seconds to 90% step change - not including sample transport time

Ambient Temperature Range

N/A 0 to 50 ºC32 to 120 ºF


N/A ±1.0% of F.S. on H2 in Air range. ±2% of F.S. in H2 or Air in CO2 ranges

Size & Weight

N/A K Style: 9 1/2" L x 7" W x 6 1/2" H @ 12 lbs (24 x 17 x 18 cm @ 3.6 kg) WP Style: 11 1/2" L x 8" W x 7 1/4" H @ 8 lbs (29 x 20 x 18 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

Unique Applications

N/A All Nova analyzers are built using proven technologies and techniques. If this product does not suit your application, please contact Nova. In many cases, we are able to build an analyzer specific to your needs.

Primary Gas to be Measured

N/A Hydrogen (H2)

Industry Type

N/A Power Industry


    For checking purity of hydrogen (H2) in H2-cooled generators and synchronous converters. The Model 380 Series will also monitor the safe purging of H2 during shut down.


  • Rugged design that is easy to operate
  • Fast warm up and response
  • Monitors 0-100% H2 in air, 0-100% H2 in CO2, 0-100% Air in CO2
  • Rugged long life thermal conductivity cell
  • Digital readout meter with backlight
  • Rechargeable battery operation
  • Modular layout that is easy to maintain
  • Built in flow meter, flow control valve and pump
  • Built in pressure regulator prevents over pressuring of pump and sensor
  • Weatherproof (WP) cabinet with clear lexan cover
  • Sample pressure ranges 0.5 PSI to 125 PSI


  • Recorder outputs of 0-1 V or 4-20 mA
  • Suitcase (K) style cabinet available


  • Range 1 : Air for Zero, 100% H2 for Span
  • Range 2 : 100% CO2 for Zero, 100% H2 for Span
  • Range 3 : 100% CO2 for Zero, Air for Span.

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