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Dwyer Series 655

Wet/Wet Differential Pressure Transmitter
Low Range, 0-5" w.c., High Maximum Working Pressure

The Dwyer Series 655 Wet/Wet Differential Pressure Transmitter converts a positive or a positive differential pressure measurement into a standard 4-20 mA output signal. Designed for use as a wet/wet differential pressure transmitter, units can be used to measure gas or liquid pressures compatible with 316/316L stainless steel wetted parts. With an accuracy of ±0.5% FS, the Series 655 Pressure Transmitter can measure low differential pressure, but can withstand working pressures to a maximum of 300 psi (20.7 psi).  Dimensional Information

  • Refrigeration & HVAC Equipment
  • Chill Water Line Pump Monitoring
  • Water Filter Monitoring
  • Process Control

Service: Compatible, gases & liquids.
Wetted Materials: Types 316, 316L SS.
Accuracy: ±0.5% F.S. (Includes linearity, hysteresis & repeatability.)
Stability: ±1% F.S./year.
Temperature Limits: 0 to 140°F (-17.8 to 60°C).
Compensated Temperature Limits: 40 to 120°F (4.44 to 48.9°C).
Pressure Limits: 300 psi (20.7 bar) continuous; 2000 psi 137.8 bar) burst. A zero shift of up to +/- 2% F.S. may occur when 300 psi pressure is applied.
Thermal Effect: 0.025% F.S./°F (0.045% F.S./°C).
Power Requirements: 16-35 VDC (2-wire).
Output Signal: 4 to 20 mA.
Zero and Span Adjustments: Accessible potentiometers. ±10% of span.
Loop Resistance: DC; 0-1250 ohms maximum.
Current Consumption: DC; 38 mA max.
Electrical Connections: 3 position plastic terminal block.
Process Connections: 1/4" female NPT.
Enclosure Rating: Designed to meet NEMA 4X (IP66).
Mounting Orientation: Not position sensitive.
Weight: 1 lb, 11.7 oz (785 g).

CAUTION: Do not exceed specified supply voltage ratings. Permanent damage not covered by warranty will result. This device is not designed for 120 or 240 volt AC operation. Use only 16 to 35 VDC.

  • Wet/Wet Low Differential Pressure
  • Withstands High Pressure
  • Excellent Wetted Materials 316/316L Stainless Steel
  • External Span and Zero Adjustments ±10% of span
  • Highly Accurate ±0.5% Full Scale
Popular Models:
Model Number Range
 655-1 0-5" w.c. (1.24 kPa)
 655-2 0-8" w.c. (1.99 kPa)
 655-3 0-10" w.c. (2.49 kPa)
 655-4 0-20" w.c. (4.98 kPa)
 655-5 0-1 psid (6.895 kPa)
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