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Last Updates: 29/04/2021

Dwyer Series 668B/D Compact Differential Pressure Transmitters

Dwyer low-cost Series 668B/D Compact Differential Pressure Transmitters can sense differential gage pressure with ±0.8% FS accuracy and converts this pressure difference to a proportional high level analog output for both unidirectional and bi-directional pressure ranges. These transmitters can withstand up to 15 psig overpressure with no damage to the unit. The compact, lightweight design makes installation simple and easy. Units are protected against incorrect wiring and include a protective terminal cover.
Product Applications

  • HVAC and VAV control
  • Clean rooms and isolation rooms
  • Duct static pressure measurement

Service : Air and non-conductive gases.
Accuracy : ±0.8% FS.
Temperature Limits : Operating: 0 to 170°F (-18 to 77°C); Storage: -40 to 185°F (-40 to 85°C).
Pressure Limits : 15 psig (1.0 bar).
Thermal Effects : ±0.03% FS/°F (±0.054% FS/°C).
Compensated Range : From 40 to 170°F (4.4 to 77°C).
Power Requirements : 12 to 32 VDC.
Output Signals : 4 to 20 mA (2-wire), 0 to 10 VDC (3-wire), or 0 to 5 VDC (3-wire).
Zero Adjustment: Accessible under the small terminal cover.
Electrical Connection: Terminal strip.
Process Connection: 3/16″ OD barbed brass for 1/8″ ID push-on tubing.
Enclosure: Stainless steel and PC+ABS alloy, UL 94 V-0 rated.
Weight : 4.0 oz (113 g).
Agency Approvals: CE.

  • Protection from 15 psi overpressure & incorrect wiring
  • High accuracy at low pressure ranges
  • Two package selections allows easy device mounting to best fit application pressure connections

Manual: Instruction Manual
Catalog Pages: Series 668B-D Catalog Page

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