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Dwyer Wet/Wet Differential Pressure Transmitter, Series 645

Series 645 Wet/Wet Differential Pressure Transmitter

Brand: Dwyer Instruments, LLC
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Dwyer Wet/Wet Differential Pressure Transmitter, Series 645
Series 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 4-20 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.

For ease of installation and maintenance, order optional 3-valve manifold assembly. Bleed ports allow for total elimination of air in the line and pressure cavities.
Features
  • Versatile, high-accuracy device for liquid or gas supports designs requiring more precise measurements in support of application
  • Optional 3-way valve manifold supports simplifying installation or removal of transmitter without interrupting process

1 - 12 of 35 Part Numbers
645-0
645-0
DWYER Wet/Wet Differential Pressure Transmitter, Range 0-1 psid.
  • Pressure Range - psid: 0 to 1 (bar: 0 to 0.069, kPa: 0 to 6.895)
  • Model - Standard
  • Certificates - None
645-0-3V
645-0-3V
  • Pressure Range - psid: 0 to 1 (bar: 0 to 0.069, kPa: 0 to 6.895)
  • Model - 3-Way Valve Manifold Assembly
  • Certificates - None
645-0-3V-NISTCAL-PT1
645-0-3V-NISTCAL-PT1
  • Pressure Range - psid: 0 to 1 (bar: 0 to 0.069, kPa: 0 to 6.895)
  • Model - 3-Way Valve Manifold Assembly
  • Certificates - NIST Traceable Calibration Certificate
645-0-NISTCAL-PT1
645-0-NISTCAL-PT1
  • Pressure Range - psid: 0 to 1 (bar: 0 to 0.069, kPa: 0 to 6.895)
  • Model - Standard
  • Certificates - NIST Traceable Calibration Certificate
645-1
645-1
DWYER Wet/Wet Differential Pressure Transmitter, Range 0-2 psid.
  • Pressure Range - psid: 0 to 2 (bar: 0 to 0.138, kPa: 0 to 13.79)
  • Model - Standard
  • Certificates - None
645-1-3V
645-1-3V
  • Pressure Range - psid: 0 to 2 (bar: 0 to 0.138, kPa: 0 to 13.79)
  • Model - 3-Way Valve Manifold Assembly
  • Certificates - None
645-1-3V-NISTCAL-PT1
645-1-3V-NISTCAL-PT1
  • Pressure Range - psid: 0 to 2 (bar: 0 to 0.138, kPa: 0 to 13.79)
  • Model - 3-Way Valve Manifold Assembly
  • Certificates - NIST Traceable Calibration Certificate
645-10
645-10
DWYER Wet/Wet Differential Pressure Transmitter, Range ± 0.5 psid.
645-11
645-11
DWYER Wet/Wet Differential Pressure Transmitter, Range ± 1 psid.
645-12
645-12
DWYER Wet/Wet Differential Pressure Transmitter, Range ± 2.5 psid.
645-13
645-13
DWYER Wet/Wet Differential Pressure Transmitter, Range ± 5 psid.
645-14
645-14
DWYER Wet/Wet Differential Pressure Transmitter, Range ± 10 psid.
1 - 12 of 35 Part Numbers

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Specifications

Brand

Accuracy

  • ± 0.25 % of Full Scale RSS

Approvals & Certifications

  • CE

Electrical Connectors

  • 0.875” Diameter Conduit
  • Barrier Strip Terminal Block

Enclosure, Body Material

  • Aluminum
  • Stainless Steel

Environmental Protection

  • IP56
  • NEMA 4X

Loop Resistance

  • 0 to 1,000 ohms

Media

  • Compatible Gases
  • Compatible Liquids

NACE & NIST

  • NIST Traceable Calibration Certificate

NPT Connection

  • 1/4” NPT Female

O-Ring Material

  • Fluoroelastomer (Wetted Materials)

Operating Temperature

  • -22° to 80° C (0° to 175° F)

Output

  • 4-20 mA, 2-Wire

Power Requirement

  • 11-30 Vdc

Pressure Range

  • bar: 0 to 6.89
  • kPa: 0 to 689.5
  • psid: 0 to 100

Pressure Type

  • Differential

Response Time

  • 30 to 50 milliseconds

Span & Zero Adjustments

  • ± 1 mA, Non-Interactive

Storage Temperature

  • -54° to 126° C (-65° to 260° F)

Temperature Effect

  • Zero & Span: ± 0.02 % of Full Scale/°F at -1° to 65° C (30° to 150° F)

Wetted Materials

  • 300 Stainless Steel
  • 630 Stainless Steel
  • Fluoroelastomer
  • Silicone

  • Process control
  • Filter monitoring
  • Refrigeration equipment
  • Pump speed control
  • HVAC equipment
  • Liquid level measurement

Documentation

Approvals

Catalogs

Manuals

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