Category
Differential Pressure Transmitters for AHUs
Differential pressure transmitters for AHUs, filters, fans and clean rooms from Produal.
A differential pressure transmitter for an AHU measures the pressure difference across filters, fans, coils or between rooms, sending a continuous signal so the BMS can control dampers, alarm on clogged filters and hold a room's pressure. Produal's DPT range is engineered for building automation, with a model for every job from simple filter monitoring to clean room control.
9 Products · Differential Pressure Transmitters for Air
2-wire Differential Pressure Transmitter DPT-2W
DPT-R8 WITH FLAMEPROOF ENCLOSURE
HVAC differential pressure transmitter for air, flameproof enclosure, 8 selectable ranges
Differential Pressure Transmitter DPT-Dual-MOD
Differential Pressure Transmitter DPT-Priima
Differential Pressure Transmitter DPT-Priima-MOD-AZ-D
Differential Pressure Transmitter DPT-R8
Differential Pressure or Airflow Controller DPT-Ctrl
Differential Pressure or Airflow Controller DPT-Ctrl-MOD
Differential pressure transmitter for AHU
Selection guide
Differential Pressure Transmitters for AHUs Guide
How differential pressure control works in an AHU
The transmitter senses the pressure difference between two points, such as either side of a filter or between two rooms, and outputs a signal proportional to it. The BMS compares that against a setpoint to alarm, modulate a fan, or hold a clean room in the correct pressure cascade relative to surrounding spaces.
Choosing a DPT transmitter for air
- Simple wiring: the DPT-2W is a 2-wire, loop-powered 4 to 20 mA transmitter with ranges from ±25 Pa, for jobs that don't need extra features.
- Field-adjustable range: the DPT-R8 offers voltage and current outputs with 8 selectable ranges, plus cold-resistant -40C versions with a heating element.
- Two points at once: the DPT-Dual-MOD reads two pressure sensors and two extra inputs over Modbus RTU, and the AHU version (DPT-Dual-MOD-AHU) pairs a -700 to 7000 Pa range with a -250 to 2500 Pa range for two different measuring points.
- Clean room accuracy: the DPT-Priima gives ±0.4% ±0.4 Pa accuracy; the Priima-MOD adds Modbus and airflow calculation.
- Constant pressure or flow control: the DPT-Ctrl and DPT-Ctrl-MOD hold a setpoint for fans, VAV systems and dampers rather than just reporting a value.
- Hazardous areas: the DPT-R8 with flameproof enclosure.
For industrial differential pressure transmitters beyond HVAC, see Air Differential Pressure Transmitters. For hazardous-area versions, see Flameproof Differential Pressure Transmitter.
FAQ
Common questions
Which transmitter suits a clean room?
The DPT-Priima, with ±0.4% ±0.4 Pa accuracy, is built for the tight tolerances a clean room needs to hold its pressure cascade relative to surrounding spaces. The Priima-MOD version adds Modbus communication and airflow calculation on top of that accuracy.
Can one transmitter monitor two points in an AHU?
Yes. The DPT-Dual-MOD-AHU has two pressure sensors with different ranges, -700 to 7000 Pa and -250 to 2500 Pa, so it can cover a higher-pressure point like a fan alongside a lower-pressure point like a filter from a single device.
Which models work in very cold conditions?
The -40C models of the DPT-R8, which have a heating element to keep the sensor working down to -40 °C. This suits outdoor air handling units or unheated plant rooms where a standard transmitter's range wouldn't hold.
What is the simplest option for a basic filter pressure alarm?
The DPT-2W, a 2-wire loop-powered 4 to 20 mA transmitter with ranges from ±25 Pa. It doesn't need a separate power supply, which keeps wiring simple for a straightforward filter or fan monitoring point.
How does a DPT-Ctrl differ from a standard DP transmitter?
A standard DPT-R8 or DPT-2W only reports the pressure it measures. The DPT-Ctrl and DPT-Ctrl-MOD actively hold a pressure or flow setpoint, controlling a fan, VAV box or damper directly, which suits jobs where you want constant pressure rather than just a reading.
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