Dwyer 490A-1 Wet/Wet Handheld Digital Manometer


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Dwyer 490A-1 Wet/Wet Handheld Digital Manometer

Wet/Wet Manometer, 0.5% Accuracy, Range 0-15 PSI

Liquid & Gas Pressure Measurement, ±0.5% F.S. Accuracy

SERIES 490 DIGITAL MANOMETERS are versatile, hand-held, battery operated manometers available in several basic ranges for positive or positive differential pressure measurement and can tolerate most liquid media compatible with 316LSS. A memory function allows storage of up to 40 readings for later recall and a backlight provides auxiliary lighting for hard-to-see locations. Standard are a hold feature and both visual and audible overpressure alarms. A new feature added to the Series 490 is a field adjustable damping. This allows the user to choose the level of display averaging rate corresponding to the fluctuation level common in many applications. A 9V alkaline battery is included that provides up to 100 hours of operation.

Product Applications

  • Balance hydronic heating or cooling water loops.
  • Check pump or chiller performance.
  • Determine pressure head loss from valves and pipe reduction.


Compatible gases & liquids.
Wetted Materials:
Without valve: Type 316L SS. Additional wetted parts with 3-way valve option: Buna-N, silicone grease, PTFE, brass 360, copper, reinforced acetal copolymer.
±0.5% Full Scale, 60 to 78°F (15.6 to 25.6°C); ±1.5% Full Scale from 32 to 60°F and 78 to 104°F (0 to 15.6°C and 25.6 to 40°C).
Pressure Hysteresis:
±0.1% of Full Scale.
Pressure Limits:
See Ordering page.
Temperature Limits:
32 to 140°F (0 to 60°C).
Storage Temperature Limits:
-4 to 176°F (-20 to 80°C).
0.42" (10.6 mm) 4 digit LCD.
See Ordering page.
Power Requirements:
9 V alkaline battery, installed non-functional, user replaceable.
14.1 oz (400 g).
Process Connections:
Two 1/8" (3.18 mm) female NPT.
Agency Approvals:


  • Measures Virtually any Liquid Media Compatible with 316L Stainless Steel.
  • Instant Selection from up to Seven English/Metric Units.
  • Stores 40 Readings in Memory for Later Reference.
  • Both Audible and Visual Overpressure Alarms.
  • Operates up to 100 Hours on a Single 9 Volt Battery.
  • New Adjustable Dampening Feature for Averaging Fluctuating Readings.

Product Literature


Catalog Pages


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  • Dwyer 490A-1 Wet/Wet Handheld Digital Manometer