Dwyer High Accuracy Pressure Transmitter, Series 644
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Series 644 High Accuracy Pressure Transmitter

Brand: Dwyer Instruments, LLC
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The Series 644 Industrial Pressure Transmitter is a robust transmitter designed for high accuracy pressure applications.

Boasting an accuracy of ±0.05% FS RSS (<±0.25% TEB), the 644 is intended for precise measurements in the critical applications of calibration technology, hydraulic/pneumatic controls, and many more laboratory and industrial settings. 

The Series 644 offers multiple measurement options with two output choices (VDC or mA) and ten psig pressure ranges (optional 0 to 15 psia).

The robust and compact all stainless steel Series 644 is available with either a 1/4" male NPT, or 7/16"-20 male SAE process connections. Each transmitter is provided with an 11 point NIST traceable calibration certificate.
Features
  • High accuracy provides exceptional measurement for insuring tight-control and minimizing costly out of specification conditions
  • NIST calibrated to provide traceability for regulated processes where production and documentation is monitored
  • Low thermal error over a wide range of temperatures helps to insure accurate pressure measurement and process operation

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Specifications

Brand

Accuracy

  • ± 0.05 % of Full Scale RSS
  • Total Error Band: < ± 0.25 % of Full Scale over Entire

Approvals & Certifications

  • CE

Compensated Temperature

  • -20° to 60° C (-4° to 140° F)

Consumption

  • 20 mA
  • 22 mA

Electrical Connectors

  • 3 feet Cable
  • 6-Pin Male Bayonet Connector

Environmental Protection

  • IP65
  • NEMA 4X

Loop Resistance

  • Minimum (Vdc) = 9 + 0.02 x Resistance of Receiver Plus Line

Media

  • Compatible Gases
  • Compatible Liquids

NPT Connection

  • 1/4” NPT Male

Output

  • 0-10 Vdc, 4-Wire
  • 4-20 mA, 2-Wire

Power Requirement

  • 9-30 Vdc for Current Output

Pressure Range

  • bar: -1 to 69
  • kPa: -100 to 6,900
  • psig: -14.7 to 1,000

Pressure Type

  • Gauge

Response Time

  • < 10 milliseconds (Voltage Output)
  • < 80 milliseconds (Current Output)

SAE Connection

  • 7/16”-20 SAE Male

Sensor Orientation

  • Vertical

Stability

  • < 0.15 % of Full Scale Per Year

Temperature Range

  • -40° to 85° C (-40° to 185° F)

Wetted Materials

  • 630 Stainless Steel

  • Calibration equipment
  • Test benches
  • Pulp and paper mills
  • Hydraulic/pneumatic controls
  • Transportation
  • Power generation

Documentation

Approvals

Catalogs

Manuals

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