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The Nova 203 Series Portable Dew Point Analyzers have been designed primarily for accurate dew point measurement of dry, non-corrosive industrial gases or dry oil-free air. The long-life sensing element varies its electrical capacitance in direct proportion to variances in the sample gas dew point.

The 203 Series can have either a built-in pressure regulator for positive pressure samples or a built-in sample pump for atmospheric pressures, or both. The sample flow is shown on a flow meter on the front or top panel. The dew point is shown on a large LCD display with a switchable backlight. A 0-1V or 4-20mA output is optionally available. Some models available with rechargeable battery operation.
Unit of Measure


Method of Detection

N/A Long-life capacitance sensor

Ranges Available

N/A -80°C to 20°C (-112°F to 68°F) Dew Point


N/A 1°F (1°C) Dew Point

Accuracy & Repeatability

N/A ±1°C from -60 to +20°C Dew Point; ±2°C from -80 to -60°C ±1°F from -76 to +68°F Dew Point; ±2°F from -112 to -76°F


N/A ±2% of full scale per month maximum

Response Time (T-90)

N/A Less than 30 seconds at higher dew points; lower dew points may take up to 1 minute (sensor must be in pre-dried state)

Ambient Temperature Range

N/A -18 to 50 ºC0 to 120 ºF


N/A ±2°F/C over measurement range

Size & Weight

N/A BT Style - Approx. 9" H x 8" W x 10" D @ 8 lbs (23 x 20 x 25 cm @ 3.6 kg) K Style - Approx. 14" L x 6" H x 10 1/2" D @ 12 lbs (35 x 15 x 26 cm @ 5.5 kg)


N/A 115 VAC, 60 Hz for recharging 220 VAC 50 Hz available

Output Options

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


N/A High or low dew point alarms with LED (optional)

Hazardous Area Rating Options

N/A General Purpose, Non-Hazardous



    For checking lower range dew points of air, hydrogen/nitrogen atmosphere furnace gases or other dry, oil-free process gases.



  • Low range of -112 to +68°F (or -80 to 20°C) Dew Point
  • Easy to operate
  • Fast warm-up and response
  • Use on any clean, non-corrosive industrial gases or air
  • Long-life dew point sensor
  • May be calibrated in the field
  • Large LCD digital readout with backlight
  • Configurations available for wide range of sample pressures
  • No external adjustments to make



  • Recorder outputs of 0-1 V or 4-20 mA
  • Rugged "K" style weathertight suitcase enclosure
  • high or low dew point alarm



  • On analyzed dry nitrogen (N2) for low setting
  • On known, current ambient air dew point for span
  • Alternatively, the analyzer may be returned to Nova for a certified calibration

Unique Applications


    The 203 Series should not be used to measure dew points when trace amounts of sulfur trioxide (SO3), chlorine (Cl2), hydrogen chloride (HCl), or ammonia (NH3) are present.

    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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