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


Dwyer Series 668

Differential Pressure Transmitter
Ranges from 0 to 0.25 in. w.c., Overpressure Protection to 10 psig, ±1% Accuracy
 
Dwyer Series 668Our low cost Series 668 Differential Pressure Transmitter is capable of measuring low pressures with a ±1% accuracy - ideally suited for proper building pressurization and air flow control. Transmitters can withstand up to 10 psig overpressure with no damage to the unit. Variable capacitance sensor design provides excellent sensitivity and long-term stability. Compact, lightweight design makes installation simple and easy. Units also feature reverse-polarity protection.
  • Service: Air and non-conductive gases.
  • Accuracy: ±1% of full scale (RSS), (includes non-linearity, hysteresis, and non-repeatability).
  • Temperature Limits: Operating: 0 to 150°F (-18 to 65°C), Storage: -40 to 185°F (-40 to 85°C).
  • Pressure Limits: 10 psig (0.7 kg/cm²).
  • Compensated Temperature Range: 0 to 150°F (-18 to 65°C).
  • Thermal Effects: 0.033% FS/°F (0.18% FS/°C).
  • Supply Voltage: 12-30 VDC.
  • Output: 4 to 20 mA, 2-wire.
  • Zero and Span Adjustment: ±1 mA, non-interactive.
  • Response Time: <60 msec.
  • Loop Resistance: 0-800 ohms.
  • Electrical Connection: Terminal strip.
  • Pressure Connection: 3/16" O.D. fitting for 1/4" I.D. tubing.
  • Housing: Fire retardant glass filled polyester.
  • Weight: 3 oz (85 g).
 
Popular Standard Models
Model Number Range
 668-1  0 to 0.25 in. w.c.
 668-2  0 to 0.5 in. w.c.
 668-3  0 to 1 in. w.c.
 668-4  0 to 2.5 in. w.c.
 668-5  0 to 5.0 in. w.c.
 668-6  0 to 10 in. w.c.
 668-7  0 to 25 in. w.c.
 668-8  0 to 50 in. w.c.
 668-9  0 to 100 in. w.c.
 
Popular Bi-Directional Models
Model Number Range
 668-10  0 to ± 0.1in. w.c.
 668-11  0 to ± 0.25 in. w.c.
 668-12  0 to ± 0.5 in. w.c.
 668-13  0 to ± 1 in. w.c.
 668-14  0 to ± 2.5 in. w.c.
 668-15  0 to ± 5 in. w.c.
 668-16  0 to ± 10 in. w.c.
 668-17  0 to ± 25 in. w.c.
 668-18  0 to ± 50 in. w.c.
 668-19  0-.4 in. w.c.
 
Popular Models with Conduit Cover
Model Number Range
 668C-1  0 to 0.25 in. w.c.
 668C-2  0 to 0.5 in. w.c.
 668C-3  0 to 1 in. w.c.
 668C-4  0 to 2.5 in. w.c.
 668C-5  0 to 5.0 in. w.c.
 668C-6  0 to 10 in. w.c.
 668C-7  0 to 25 in. w.c.
 668C-8  0 to 50 in. w.c.
 668C-9  0 to 100 in. w.c.
 
Popular Bi-Directional Models with Conduit Cover
Model Number Range
 668C-10  0 to ±0.1 in. w.c.
 668C-11  0 to ±0.25 in. w.c
 668C-12  0 to ±0.5 in. w.c.
 668C-13  0 to ±1 in. w.c.
 668C-14  0 to ±2.5 in. w.c.
 668C-15  0 to ±5 in. w.c.
 668C-16  0 to ±10 in. w.c.
 668C-17  0 to ±25 in. w.c.
 668C-18  0 to ±50 in w.c.
 668C-19  0-.4 in. w.c.
 
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