Multifunctional differential pressure transmitters with air flow measurement and Modbus communication

DPT-MOD is a multifunctional transmitter for measuring volume flow, velocity, and static and differential pressure. The measurements can be read and the configuration done via Modbus communication. DPT-MOD requires less wiring than the traditional 3-wire transmitters because multiple devices can be connected on serial line. DPT-MOD can also be used with several different measurement probes such as FloXact™ or pitot tube, and air dampers.


DPT-MOD series devices include:
• Two selectable functions:
o Measure and monitor in-duct volume flow, velocity or
differential pressure
o Measure and monitor air flow across centrifugal fans


• Multiple selectable measurement units:
o Volume flow: m3/s, m3/h, cfm, l/s
o Velocity: m/s, ft/min
o Pressure: Pa, inWC, mmWC, kPa, mbar


• Modbus communication protocol


DPT-MOD series device options offer:
• AZ (autozero) function for automatic zero point calibration, eliminating the need for periodic manual autozeroing to ensure long term accuracy



Technical details

Communication: RS-485 Modbus (RTU)
Accuracy (from applied pressure):
(model 2500)
Pressure < 125 Pa = 1 % + ±2 Pa
Pressure > 125 Pa = 1 % + ±1 Pa
Accuracy (from applied pressure):
(model 7000)
Pressure < 125 Pa = 1.5 % + ±2 Pa
Pressure > 125 Pa = 1.5 % + ±1 Pa
Zero point calibration: automatic with autozero element (-AZ), by pushbutton or via Modbus
Measuring units: Pressure: Pa, kPa, mbar, inchWC, mmWC, psi
Flow: m3/s, m3/hr, cfm, l/s, m/s, ft/min
Measuring element: MEMS, no flow-through
Supply voltage: 24 VAC ±10 % / 24 VDC ±10 %
Power consumption: < 1.3 W
-40 °C model: <4.3 W when <0 °C
Output signal: via Modbus
Response time: 1.0−20 s, selectable via menu or via Modbus
Operating temperature: -20…+50 °C (with autozero calibration -5...+50 °C)
-40…+50 °C (-40C model)
Protection standard: IP54




Product series

Differential pressure transmitter

Model type

Modbus communication

Measuring ranges (Pa)


Zero point calibration

With autozero calibration
Standard with pushbutton manual zero point calibration



Cold resistance

Without cold resistance
-40 °C cold resistant (not available with autozero calibration)