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The Nova 253 Series Continuous Analyzers for Low Range Dew Point have been designed primarily for accurate dew point analysis of heat treating atmospheres, instrument air, or other applications which may have typical dew points that are lower than what can be read by standard dew point analyzers, such as the Nova 257 Series. The dielectric polymer sensor provides stable and accurate measurements and is not affected by most gas compositions, except those containing SO2, SO3 and HCl.
Unit of Measure


Method of Detection

N/A Dielectric polymer sensor that changes capacitance with moisture variation

Ranges Available

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


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

Response Time (T-90)

N/A Less than 60 seconds to T90 at higher dew points; Lower dew points may take an hour or more to dry down from ambient air

Ambient Temperature Range

N/A -18 to 49 ºC0 to 120 ºF


N/A ±2°F / °C over measurement range

Size & Weight

N/A 16" W x 14" H x 8" D @ 10 lbs (41 x 36 x 20 cm @ 4.5 kg)


N/A 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 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 atmospheres or other dry-oil free gases.



  • Low range analysis available, down to -112° to +68°F (-80°C to +20°C) Dew Point
  • Rugged design that is easy to operate
  • Use on any non-corrosive industrial gases or oil-free air
  • Long-life dielectric polymer sensor
  • May be calibrated in the field
  • Bright digital readout
  • Built in sample pump, pressure regulator or filter
  • 4-20 mA output, non-isolated
  • NEMA 12 enclosure standard



  • High or low dew point alarm with LED on panel
  • 0-1VDC or isolated 4-20 mA recorder outputs
  • Corrosion resistant wall mount enclosure
  • NEMA 4, NEMA 4X and rack mount enclosures available



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

Unique Applications


    The 253 Series may not be appropriate for use when ammonia or other corrosive gases 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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