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DPS629 Differential Pressure Transmitter

For Monitoring Hydronic HVAC Systems

Taco DPS sensors monitor the differential pressure in a hydronic HVAC system. As the system operates and sees an increase or decrease in demand, these sensors relay the system  pressure changes back to the building management system or VFD to modulate pump speed. Taco offers two models: the DPS629 Differential Pressure Transmitter, designed to meet NEMA 4X (IP66) construction, and the DPS3100D Smart Pressure Transmitter, with a 100:1 turn downrange that allows the smart transmitter to be configured to fit any application.


The Taco DPS629 Differential Pressure Transmitter monitors differential pressure of air and compatible gases and liquids with 0.5% accuracy. The design employs dual pressure sensors converting pressure changes into a standard 4-20 mA output signal for two wire circuits. Small internal volume and minimum moving parts result in exceptional response and reliability. Terminal block, zero and span adjustments are easily accessed under the top cover. The DPS629 Differential Pressure Transmitter is designed to meet NEMA 4X (IP66) construction.

Instruction Sheet
Submittal Data
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Performance Data

Accuracy: ±0.5% F.S. (includes linearity, hysteresis and repeatability).
Temperature Limits: 0 to 200°F (-18 to 93°C).
Compensated Temp. Limits: 0 to 175°F (-18 to 79°C).
Pressure Limits: 0 – 25 PSI with an over pressure limit of 250PSI.
Thermal Effect: 0.02%/°F (0.036%/°C) includes zero & span.
Power Requirements: 13-30 VDC (2-wire).
Output Signal: 4 to 20 mA. Optional 0-5, 0-10 VDC

  • Compatible gases & liquids
  • Electrical Connections: Terminal block, 1⁄ 2″ female NPT conduit
  • Process Connections: 1⁄ 4″ female NPT
  • Enclosure Rating: Designed to meet NEMA 4X (IP66)
  • Mounting Orientation: Not position sensitive
  • Hydronic HVAC Systems
  • Monitor differential pressures across:
    • Flow Elements
    • Pumps
    • Heat exchangers
    • Coils
    • Filters

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