Dwyer Sales Department: 1-201-419-6111 ext. 26 for Sales Group  |  dwyer@nciweb.com


Dwyer Series 645

Wet/Wet Differential Pressure Transmitter
±0.25% Accuracy. Quick Response. Two Wire Design

Dwyer Series 645Series 645 Wet/Wet Differential Pressure Transmitters are designed for use with compatible gases and liquids which can be applied to both the pressure and reference ports. Quick response capacitance sensor delivers a 4 to 20 mA output signal proportional to differential pressure with ± 0.25% accuracy. The Series 645 transmitters are ideal for process control, filter condition monitoring, refrigeration equipment, pump speed control, HVAC equipment, and liquid level measurement.

 
PHYSICAL DATA
  • Service: Compatible gases or liquids on both pressure and reference sides.
  • Output: 4 to 20 mA, 2-wire.
  • Supply Voltage: 11 to 30 VDC.
  • Loop Resistance: 0 to 1000W.
  • Zero and Span: Adjustable, non-interactive.
  • Max Line Pressure: 250 psig.
  • Max Overload Pressure: (High side) 1 to 5 psi: 20 x FS, 10 to 25 psi: 10 x FS, 50 psi: 5 x FS, 100 psi: 2.5 x FS; (Low side) 2-3 x FS.
  • Temperature Limits: Operating: 0 to 175°F (-22 to 80°C), Storage: -65 to 260°F (-54 to 126°C)
  • Accuracy: ± 0.25% FS (RSS).
  • Response Time: 30 to 50 msec.
  • Thermal Effects: (includes zero and span) ± 0.02% FS/°F, 30 to 150°F (-1 to 65°C).
  • Wetted Parts: 17-4 PH stainless steel, 300 Series stainless steel, Viton and Silicone O-rings and bleed screw seals.
  • Housing: Stainless steel/ Aluminum.
  • Process Connection: ¼" - 18 NPT(F).
  • Electrical Connection: Barrier strip terminal block with conduit enclosure and .875" (22mm) diameter conduit opening.
  • Weight: 14.4 oz (0.4 kg).
 
MODELS NUMBERS (stock shown in bold)
Model Number Range
 645-1  0 to 2 psid
 645-2  0 to 5 psid
 645-3  0 to 10 psid
 645-4  0 to 25 psid
 645-5  0 to 50 psid
 645-6  0 to 100 psid
 645-11  +- 1 psid
 645-12  +- 2.5 psid
 645-13  +- 5 psid
 645-14  +- 10 psid
 645-15  +- 25 psid
 645-16  +- 50 psid
 
 
Previous Page