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The Nova 337 Portable Process Analyzer has been designed for the detection of sulfur hexaflouride (SF6) primarily in air or nitrogen (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 SF6. It has an expected life of over 10 years unless contaminated.

In operation, the sample gas will flow through a built-in regulator or be drawn in by a sample pump draws through the sample tube, filter, flow meter and then on to the T/C cell. The detected SF6 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% SF6 in air or in N2


N/A 0.1% of He

Accuracy & Repeatability

N/A ±2% of full scale


N/A ±1% of full scale per day (after calibration)

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. on SF6 in Air

Size & Weight

N/A 9 1/2" L x 6 1/2" H x 7" D @ 8 lbs (24 x 16.5 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


N/A High or low SF6 alarms (optional)

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    For checking sulfur hexafluoride (SF6) in blanketing applications for power cable, switch gear and magnesium production.



  • 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
  • Sample can be returned to process (at atmospheric pressure)
  • Rechargeable 'gel cell' battery operated
  • Built in sample pump or regulator
  • Weatherproof (WP) cabinet with clear lexan cover



  • Recorder outputs of 0-1 V or 4-20 mA
  • Sample Condensate removal for wet applications
  • Suitcase (K) style cabinet available
  • AC power only operation
  • SF6 alarms with LED
  • Detachable/portable data logger



  • Ambient air for zero
  • Source of 100% SF6 calibration gas for span.

Unique 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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