Category
Mass Flow Meters for Air and Gas
Measure air and gas mass flow with the Halstrup-Walcher P26.2.
A mass flow meter reports flow by weight rather than volume, so the reading doesn't drift as temperature or pressure change. The Halstrup-Walcher P 26.2 differential pressure transmitter, scalable from 10 Pa with ±0.2% FS accuracy up to 50 kPa, pairs with a pitot tube or the Wilson flow grid for combustion air, process air and fermenter aeration duties.
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Selection guide
Mass Flow Meters for Air and Gas Guide
How a mass flow meter works
Volume flow changes with gas temperature and pressure even when the actual mass moving through the duct stays the same, which matters for combustion air and process gas dosing. The P 26.2 doesn't sense mass directly: it measures the differential pressure from a primary element, such as a pitot tube or flow grid, at high accuracy and outputs an analogue signal to your PLC or DCS, which then applies a mass flow calculation using the known gas properties.
How to choose a mass flow meter
- Range: the P 26.2 is scalable from as low as 10 Pa, so it suits both low-pressure ventilation ducts and higher-pressure combustion air lines on the same transmitter platform.
- Accuracy: it's rated ±0.2% FS for spans up to 50 kPa, with high overpressure protection, so a transient pressure spike won't damage the sensor or upset the reading afterwards.
- Primary element: the transmitter alone doesn't measure flow. Pair it with a Wilson flow grid or an averaging pitot tube sized to your duct, chosen from the pitot tube range.
- Output: it gives a standard analogue signal to your PLC or DCS, suiting existing combustion or process control loops without extra signal conditioning.
- Typical duty: combustion air to burners and boilers, process and drying air, and air supply to fermenters and aeration systems, where an accurate, temperature-independent reading matters for combustion efficiency or dosing control.
Confirm your actual pressure span with us before ordering, since the accuracy figure is stated up to 50 kPa full scale.
FAQ
Common questions
What is a mass flow meter used for?
It reports the mass of gas passing through a duct or pipe rather than its volume, so the reading stays consistent even as temperature or pressure changes. It's used for combustion air to burners and boilers, process and drying air, and aeration air to fermenters, where accurate dosing matters.
What's the difference between mass flow and volume flow?
Volume flow reports the space the gas occupies per hour, which expands or contracts with temperature and pressure. Mass flow reports the actual weight of gas moving, which stays the same regardless of those changes. For combustion air and process dosing, mass flow gives the more reliable control input.
Does the P 26.2 measure flow by itself?
No, it's a differential pressure transmitter. It needs a primary element, such as a pitot tube or the Wilson flow grid, fitted in the duct to generate the pressure signal, which the P 26.2 then reads at ±0.2% FS accuracy and passes to your PLC or DCS.
How accurate is the Halstrup-Walcher P 26.2?
It's rated ±0.2% of full scale for measuring ranges up to 50 kPa, with high overpressure protection built in. Confirm the actual pressure span for your application, since accuracy is stated against the selected full-scale range rather than a single fixed figure across all spans.
What applications use a mass flow meter like the P 26.2?
Typical duties include combustion air metering to burners and boilers, monitoring process and drying air, and controlling air supply to fermenters and aeration systems. These are all cases where a temperature-independent reading matters more than a simple velocity figure.
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