Category
Airflow Probes for HVAC Ducts
Balance and monitor supply and exhaust air in HVAC systems with duct airflow probes.
An airflow probe fitted in a duct measures the volume of air moving through it, which is what balancing an HVAC system and tracking energy use actually require, rather than a single-point velocity reading. Variable air volume systems need this continuously, and the Produal FloXact gives a representative average across the duct.
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Selection guide
Airflow Probes for HVAC Ducts Guide
Why an averaging probe
Airflow in HVAC ducts is uneven, especially after bends, dampers and fittings, so a single-point reading can be misleading. The Produal FloXact samples total and static pressure at multiple points across the duct for a representative average, and amplifies the differential pressure 2.5 times to measure down to 1.0 m/s.
Typical HVAC uses
- Supply and extract air volume at the AHU: confirming the unit delivers its design airflow.
- Outdoor air measurement for minimum fresh air control: so the BMS can hold a set fresh-air volume.
- Tracking supply and extract airflow in labs and clean rooms: where the balance between them affects pressure control.
Pairing with a transmitter
- Pairing: the probe alone gives a differential pressure signal. Pair it with a Produal DPT-Flow airflow transmitter to convert that into an air volume reading for the BMS.
- Beyond HVAC: for general and process use, see Averaging Airflow Sensor FloXact.
FAQ
Common questions
Can I measure fresh air volume with an airflow probe?
Yes. A FloXact fitted in the outdoor air duct gives an averaged reading across the duct, which the BMS can use to hold a set minimum fresh air volume rather than relying on a fixed damper position that drifts over time.
How do I get an airflow probe reading into the BMS?
Connect the probe to a differential pressure or flow transmitter, such as the Produal DPT-Flow, which converts the probe's signal into an air volume reading and sends it to the BMS as a standard output.
Does the FloXact work at low air speeds?
Yes, down to 1.0 m/s (200 fpm), because it amplifies the differential pressure signal 2.5 times before it reaches the transmitter. This matters in ducts with low design velocities, where a standard pitot-style probe would struggle to give a usable signal.
Why is an averaging probe better than a single-point sensor in a duct?
Duct airflow is uneven after bends, dampers and fittings, so a single point can read high or low depending on where it sits. An averaging probe like the FloXact samples multiple points across the duct, giving one reading that better represents the actual air volume moving through it.
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