PID Controller – HK Instruments DPT-Ctrl-2SP Series


  • PID-controller
    • Control differential pressure or air flow in duct or across centrifugal fans
    • Two independent setpoints, switchable via binary input
    • Flow or pressure compensation according to temperature input
    • All parameters (such as PID, setpoints) are adjustable via menu
  • Multiple field selectable measurement units:
    • Volume flow: m3/s, m3/h, cfm, l/s
    • Pressure: Pa, inWC, mmWC, kPa, mbar, psi
  • Unique input/output options:
    • Setpoint switch binary input
    • Outside temperature sensor input
    • Only control voltage output (0–10 V)

Multifunctional stand-alone PID controller with two setpoints for building automation

DPT-Ctrl-2SP is designed for simple systems to control constant pressure or air flow of fans, VAV systems or dampers. The device has a binary input to select between two user-adjustable setpoints. When controlling air flow, it is possible to select a fan manufacturer or a common measuring probe that has a K-value. The device also includes a temperature sensor input which enables compensation of flow or pressure according to for example outside temperature.

DPT-Ctrl-2SP can be used to control air flow or constant pressure in applications where it is important to keep a constant vacuum or steady air flow. Energy savings and optimal indoor air quality can be achieved because of the two setpoints and the outdoor temperature compensation feature of the device. The desired setpoint can be selected, for example, with weekly clock, turn switch or key card switch.


DPT-Ctrl-2SP series devices are commonly used in HVAC/R systems for:

  • Controlling building ventilation exhaust fans based on a week clock
  • Controlling exhaust fans based on user-demand


Accuracy (from applied pressure): Pressure < 125 Pa = 1 % + ±2 Pa
Pressure > 125 Pa = 1 % + ±1 Pa
Measuring units: Pressure: Pa, kPa, mbar, inchWC, mmWC, psi
Flow: m3/s, m3/h, cfm, l/s, m/s, ft/min
Measuring element: MEMS, no flow-through
Control signal: 0…10 VDC
PID-parameters: Adjustable via menu
Zero point calibration: by pushbutton
Supply voltage: 24 VDC ±10 % / 24 VAC ±10 %
Power consumption: < 1.0 W
Operating temperature: -20…+50 °C
Protection standard: IP54


HK Instruments DPT-Ctrl-2SP Series PID Controller-DpstarGroup