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The Nova 335 Portable Analyzer has been designed for the detection of hydrogen (H2) in a binary (two gas) mixture such as H2in N2. However, it can be used in some other applications with several background gases present. Consult Nova on these applications.

The thermal conductivity (T/C) cell provides a fast and accurate measurement of H2. It has an expected life of over 10 years unless contaminated.

In operation, a built in sample pump draws in the gas sample through the sample tube, filter and flow meter and then on to the T/C cell. The detected H2 is displayed on an LCD digital meter which has a switchable back light for use in dark areas.

A rechargeable 'gel cell' battery provides enough power for approximately 8 hours of continuous operation and the analyzer can be used while it is being recharged. A red LED tells when to recharge and a green LED verifies that it is receiving recharging power. The recharger is included.

Unit of Measure


Method of Detection

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

Ranges Available

N/A 0-100% H2 in a binary gas mixture


N/A 0.1% of H2

Accuracy & Repeatability

N/A ±2% of full scale


N/A ±1% of full scale per week

Response Time (T-90)

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

Ambient Temperature Range

N/A 12 to 50 ºC55 to 120 ºF


N/A ±2% of F.S.

Size & Weight

N/A 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 0-1 VDC 4-20 mA


N/A H2 alarm with LED (optional)

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    For analysis of hydrogen (H2) in a binary gas mixture in process gases such as H2 in air, H2 in nitrogen (N2), H2 in carbon dioxide (CO2), H2 in argon (Ar), H2 in oxygen (O2), etc.



  • Rugged design that is easy to operate
  • Fast warm up and response
  • Long life thermal conductivity cell that provides accurate and stable readings
  • Digital meter readout with backlight
  • Modular layout that is easy to maintain
  • Rechargeable 'gel cell' battery operated
  • Built in sample pump or flow regulator
  • Weatherproof (WP) cabinet with clear lexan cover



  • Recorder outputs of 0-1 V or 4-20 mA
  • Sample pre-cooler for hot samples
  • Condensate removal for wet applications
  • Suitcase (K) style cabinet available
  • AC power only operation
  • H2 alarm with LED
  • Detachable/portable data logger



  • Ambient air for zero
  • Gas cylinder of known H2 for span

Unique Applications


    The Nova T/C cell will respond in the presence of many gases and may need to be compensated either directly in the analyzer or in the calibration gas. Consult Nova on these types of applications..

    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.

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