New Call-to-action
The Nova 340 Series Portable Analyzer has been designed for the dueal measurement of O2 and H2 in furnace atmoshpere gases. A built-in sample pump draws in a sample of atmosphere gas where it is detected for oxygen by a long-life oxygen sensor. At the same time, H2 is detected by a long-life thermal conductivity cell.

The model 341 is a dual range O2 version that can be switched between the standard range (0-25.0%) and a lower range (0-2.0%) usingthe same sensor. For applications requiring a PPM O2 measurement, a special low range version is available (Model 340L). The models 340 & 341 have rechargeable battery operation, a flow meter, filter, sample hose and dual digital readouts. A recharger is included. Recorder outputs of 4-20 mA or 0-1V are optional.
Unit of Measure


Method of Detection

N/A Long-life electrochemical O2 sensor, temperature-compensated thermal conductivity (T/C) H2 cell cannot be burned out due to loss of flow or changing gases

Ranges Available

N/A 0-100 to 0-9,999 PPM O2, 0-40.0% H2 (Model 340L) 0-2.00% and 0-25.0% O2, 0-40.0% H2 (Model 341) 0-25.0% O2, 0-40.0% H2 (Model 340)


N/A 0.1% on % ranges; 1 PPM on PPM O2 range

Accuracy & Repeatability

N/A ±2% of full scale


N/A ±1% of full scale per day

Response Time

N/A Less than 10 seconds to 90% step change

Ambient Temperature Range

N/A 12-50 ºC55-120 ºF


N/A ±2% of full scale

Size & Weight

N/A 11 1/2" L x 8" W x 7 1/4" H @ 8 lbs ( 29 x 20 x 18 cm @ 3.6kg)


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

Output Options

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


N/A O2 and H2 alarms with LED (optional)

Hazardous Area Rating Options

N/A General Purpose/Non-hazardous


N/A Analysis of oxygen/hydrogen (O2/H2) in exothermic furnace atmospheres for copper, brass or steel anealing, neutral heating, sintering, glass metal beds or oxide coating of steel.



  • Rugged modular design that is easy to operate and maintain
  • Fast warm-up and response
  • Long life electrochemical O2 sensor easily detects air infiltration into furnace gas
  • Long-life thermal conductivity cell that provides accurate & stable readings of H2
  • Separate digital meters with backlight
  • Rechargeable battery operation
  • Built-in sample pump, filter & flow meter
  • Weatherproof (WP) cabinet with clear Lexan cover

  • Options


  • Recorder outputs of 0-1VDC or 4-20 mA
  • Sample pre-cooler for hot samples
  • Condensate removal for wet applications
  • Suitcase (K) style cabinet available
  • AC only power option
  • O2 and H2 alarms with LED
  • Detachable/portable data logger
  • Dual range O2 (0-25.0% & 0-2.0%)(Model 341WP)
  • Special PPM O2 sensor (100-9999 PPM)(340L)

  • Calibration


  • On air for H2 zero and % O2 span
  • On analyzed mixture of % H2 in N2 for H2 span and O2 zero
  • On analyzed mixture of PPM O2 in N2 for PPM O2 span

  • 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.

    View Our
    Product Catalog
    Have a question?
    Contact Us
    Ready to get started?
    Request Quote