Category
Airflow Transmitters for Fans and Ducts
Measure air volume in fans and ducts with Produal DPT-Flow airflow transmitters.
An airflow transmitter calculates the volume of air a fan or duct is actually moving from its differential pressure, giving the BMS the basis for ventilation control, balancing and energy monitoring. The Produal DPT-Flow range covers standard building automation and, with a flameproof enclosure, dust collector and bag filter systems.
2 Products · Airflow Transmitters
Selection guide
Airflow Transmitters for Fans and Ducts Guide
How an airflow transmitter measures volume flow
Connected to a centrifugal fan's measuring points, the DPT-Flow uses the fan's own performance factor to convert the pressure difference it senses into a flow figure. In ducts, it's paired with a FloXact averaging probe to get the same result from a straight run rather than at the fan itself. Either way, the output is a volume flow figure the BMS can use directly for ventilation control, balancing and energy monitoring, rather than a raw pressure value that still needs converting.
Produal DPT-Flow range
- DPT-Flow-MOD: a multifunctional transmitter measuring airflow volume, velocity, and static and differential pressure, with Modbus RTU over RS-485. -40C models are available for very cold environments.
- DPT-Flow flameproof: measures air volume flow, velocity or differential pressure in a flameproof enclosure, with field-selectable units and 0 to 10 V or 4 to 20 mA output, for bag filter and dust collector systems.
For the duct-mounted averaging probes that pair with this range, see Airflow Probes for HVAC Ducts. For fan and duct proving without a flow calculation, see Air Velocity Transmitters for HVAC. Confirm the range and output before ordering, since a transmitter sized for a large AHU fan will under-read on a small one.
FAQ
Common questions
How does the DPT-Flow measure fan airflow?
It measures the pressure difference at the fan's dedicated measuring points and converts that into a flow figure using the fan's own performance factor, so the reading reflects what that specific fan is actually moving rather than a generic estimate.
Can the airflow transmitter be read over Modbus?
Yes. The DPT-Flow-MOD communicates over Modbus RTU (RS-485), so it can report airflow volume, velocity and pressure to a BMS or PLC without needing a separate analogue input for each value.
Is a hazardous-area airflow transmitter available?
Yes, the DPT-Flow with a flameproof enclosure, which measures air volume flow, velocity or differential pressure and suits bag filter and dust collector systems in areas where standard electronics aren't permitted.
Does the DPT-Flow work in cold environments?
The DPT-Flow-MOD is available in -40C versions for very cold environments, such as unheated plant rooms or outdoor ductwork, where a standard-range transmitter could be affected by low temperatures.
What is the difference between the DPT-Flow and a FloXact probe?
The FloXact is a duct probe that samples pressure across the airstream; on its own it gives a differential pressure signal, not a flow figure. The DPT-Flow transmitter is what converts that signal, or a fan's own measuring points, into an actual volume flow reading for the BMS.
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