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Differential Pressure Transmitter

Series 646B

The Series 646B Differential Pressure Transmitter is designed to be used with clean, dry air and other non-corrosive gases. Each unit features a flame retardant enclosure and a unique design which is suitable for circuit board mounting. Series 646B measures differential pressure at an accuracy of ±2.0% FS down to 0.5 in w.c. The transmitter contains a stainless steel sensor that provides resistance against corrosion combined with excellent performance and long term stability. The Series 646B transmitter features excellent stability, low hysteresis, accurate operation over a broad temperature range, and exceptional insensitivity to vibration. These features make the transmitters perfect for VAV systems, filter monitoring, HVAC fan control, building pressurization, and leak detection systems.

  • Service: Air and non-combustible, compatible gases
  • Wetted Materials: 302 SS, glass, nickel, polyethylene, acrylic and ABS
  • Accuracy: ±2.0% FS* at room temperature
  • *RSS (Root Sum Square) includes non-linearity, hysteresis and nonrepeatability
  • Temperature Limits: Operating: 23 to 170°F (-5 to 77°C); Storage: -6 to 185°F (-21 to 85°C)
  • Compensated Temperature: 32 to 170°F (0 to 77°C)
  • Zero/Span Shift: < 0.05% FS/F (< 0.09% FS/C)
  • Warm-Up Shift: ±0.1% FS
  • Position Effect: Unit is calibrated in a vertical position
  • Pressure Limits: ±10 psi (69 kPa)
  • Output Signal: 0.5 to 4.5 VDC ratiometric
  • Output Impedence: < 5.0 ?
  • Supply Voltage: 5.0 ±0.25 VDC
  • Response Time: Approximately 10 ms
  • Electrical Connection: Three stripped, color-coded lead wires, 26 AWG, approximately 3.5" length
  • Process Connections: 3/16" OD barbed fitting for 1/8" ID push-on tubing
  • Housing: PBT+ABS alloy
  • Weight: 3.1 oz (90 g)

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