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The Model 3255 Portable Analyzer has been designed for the accurate measurement of both PPM levels of O2 and low-level dew points in furnace atmosphere gas or in other dry process gases.  A customer-replaceable electrochemical sensor senses the O2. This sensor produces a small output current, which is directly proportinal to the PPM level of O2 present in the sample.  The dew point is sensed by an aluminum oxide sensor that baries its electrical capacitance with moisture.  The O2  and dew point signals are then amplified and displayed on the front panel meters.

A unique feature of this analyzer is the built-in micro-blocking valves that trap the last gas sample drawn into the sensors.  This ensures a rapid start and minimum purge-down time when the analyzer is used again.  The optional hydrogen detector is a thermal conductivity (T/C) Cell which responds rapidly to the hydrogen content of the sample gas.  It has an inifinite life.

Unit of Measure


N/A Customer replaceable O2 sensor, AlO2 Dew Point Sensor, T/C Cell for H2


N/A 0-10 PPM to 0-19, 999 PPM O2, -112° to + 68°F (-80° to +20°C)


N/A ±1PPM O2, ±1°C or °F Dew Point, 0.1% H2


N/A ±2% of reading


N/A Less than 1% of full scale per 8 hours


N/A O2 sensor may require an initial


N/A 0-50 ºC32 to 122 ºF


N/A ±1% of full scale


N/A BT Style: 7 1/2"W x 9 1/2" H x 10"D @ 10 lbs (19 x 24 x 25 cm @ 4.5 kg) K Style: 14"L x 6" H x 10 1/2"D @ 12 lbs (35.5 x 15.2 x 26.6 cm @ 5.5 kg) WP Style: 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, 115VAC 60Hz for recharging. (220VAC 50Hz available)


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


N/A Optional


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.


N/A Flue Gas or Emissions


    Designed for use on low oxygen (O2) and low dew point (DP) process gases


  • Compact & easy to use
  • Rechargeable battery operation or AC
  • Large LCD digital readouts with backlighting
  • Built-in sample pump or pressure regulator
  • O2 ranges: 0-10 PPM to 0-19,999 PPM
  • Dew point ranges of -112° to +68°F (-80° to +20°C)
  • Customer replaceable electrochemical O2 sensor
  • Long life aluminum oxide (AlO2) dew point sensor
  • Last sample locked into sensors when analyzer is not in use
  • May be field calibrated


  • Recorder Outputs
  • Bench Top (BT) or suitcase style (K) cabinets available
  • Detachable/portable datalogger
  • Seperate thermal conductivity hydrogen (H2 detector (3255H)


  • On dry nitrogen (N2) with known PPM moisture level for O2 zero and DP low setting
  • On analyzed PPM O2 in N2 for O2 span
  • On ambient air with known DP for DP high setting

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