Dwyer Series 668

Series 668 Differential Pressure Transmitter

Dwyer Series 668
Series 668

Ranges from 0 to 0.25″ w.c., Overpressure Protection to 10 psig, ±1% Accuracy

Our low cost Dwyer 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.

Specifications

  • 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 (0.69 bar).
  • 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).
  • Agency Approval:CE.

 

Available Models


Standard Ranges

MODELDESCRIPTION
668-1Differential pressure transmitter, range 0-0.25" w.c.
668-2Differential pressure transmitter, range 0-0.5" w.c.
668-3Differential pressure transmitter, range 0-1.0" w.c.
668-4Differential pressure transmitter, range 0-2.5" w.c.
668-5Differential pressure transmitter, range 0-5.0" w.c.
668-6Differential pressure transmitter, range 0-10" w.c.
668-7Differential pressure transmitter, range 0-25" w.c.
668-8Differential pressure transmitter, range 0-50" w.c.
668-9Differential pressure transmitter, range 0-100" w.c.


Bi-Directional Ranges

MODELDESCRIPTION
668-10Differential pressure transmitter, range 0 to ±0.1" w.c.
668-11Differential pressure transmitter, range 0 to ±0.25" w.c.
668-12Differential pressure transmitter, range 0 to ±0.5" w.c.
668-13Differential pressure transmitter, range 0 to ±1" w.c.
668-14Differential pressure transmitter, range 0 to ±2.5" w.c.
668-15Differential pressure transmitter, range 0 to ±5" w.c.
668-16Differential pressure transmitter, range 0 to ±10" w.c.
668-17Differential pressure transmitter, range 0 to ±25" w.c.
668-18Differential pressure transmitter, range 0 to ±50" w.c.


Standard Ranges with Conduit Cover

MODELDESCRIPTION
668C-1Differential pressure transmitter with conduit cover, range 0-0.25" w.c.
668C-2Differential pressure transmitter with conduit cover, range 0-0.5" w.c.
668C-3Differential pressure transmitter with conduit cover, range 0-1.0" w.c.
668C-4Differential pressure transmitter with conduit cover, range 0-2.5" w.c.
668C-5Differential pressure transmitter with conduit cover, range 0-5.0" w.c.
668C-6Differential pressure transmitter with conduit cover, range 0-10" w.c.
668C-7Differential pressure transmitter with conduit cover, range 0-25" w.c.
668C-8Differential pressure transmitter with conduit cover, range 0-50" w.c.
668C-9Differential pressure transmitter with conduit cover, range 0-100" w.c.


Bi-Directional Ranges with Conduit Cover

MODELDESCRIPTION
668C-10Differential pressure transmitter with conduit cover, range 0 to ±0.1" w.c.
668C-11Differential pressure transmitter with conduit cover, range 0 to ±0.25" w.c.
668C-12Differential pressure transmitter with conduit cover, range 0 to ±0.5" w.c.
668C-13Differential pressure transmitter with conduit cover, range 0 to ±1" w.c.
668C-14Differential pressure transmitter with conduit cover, range 0 to ±2.5" w.c.
668C-15Differential pressure transmitter with conduit cover, range 0 to ±5" w.c.
668C-16Differential pressure transmitter with conduit cover, range 0 to ±10" w.c.
668C-17Differential pressure transmitter with conduit cover, range 0 to ±25" w.c.
668C-18Differential pressure transmitter with conduit cover, range 0 to ±50" w.c.