Category
Portable Gas Flow Meters
Handheld meters for commissioning, audits and spot checks of gas and air flow in ducts and pipelines.
A portable gas flow meter gives a handheld reading for consumption audits, commissioning and spot checks on gas and air lines. The Höntzsch flowtherm NT.2 accepts several sensor types, including vortex VA probes, and logs field data, while the flowtherm Ex covers the same duties in ATEX Zone 1 and 2 areas, rated II 2G Ex ib IIC T4.
2 Products · Portable Gas Flow Meter
Selection guide
Portable Gas Flow Meters Guide
What a portable gas flow meter is used for
Both flowtherm units are evaluation units, not sensors on their own: you connect a Höntzsch probe, such as a vortex VA type, and the handheld unit processes and logs the signal. That makes one unit usable across several sensor types and applications, rather than buying a dedicated meter for each duct or line you need to check.
How to choose a portable gas flow meter
- Hazardous area: choose the flowtherm Ex, ATEX rated II 2G Ex ib IIC T4, for Zone 1 and 2 gas atmospheres. Choose the standard NT.2 for non-hazardous plant, where it costs less and has no zone restriction to manage.
- Sensor flexibility: both units accommodate several Höntzsch sensor types, including vortex VA probes, so the same handheld unit covers different duct sizes and flow ranges as you move between measurement points.
- Typical use: air and gas consumption audits, commissioning and checking fixed flow meters already installed, and measuring exhaust or process gas flows during a plant survey.
- Data logging: the NT.2 logs data during field measurements, useful for building a record across multiple points without transcribing readings by hand.
Confirm your hazardous area category and temperature class against the flowtherm Ex rating before deployment. For a fixed vortex installation instead of a handheld unit, see the vortex flow meter.
FAQ
Common questions
What is a portable gas flow meter used for?
It's a handheld evaluation unit for spot checks, consumption audits and commissioning, connected to a Höntzsch sensor such as a vortex VA probe. Typical jobs include auditing air and gas consumption, verifying fixed meters already installed, and measuring exhaust or process gas flows during a survey.
What's the difference between the flowtherm NT.2 and flowtherm Ex?
The NT.2 is for standard industrial use and accommodates several Höntzsch sensor types with data logging. The flowtherm Ex has the same measurement capability but carries ATEX certification, II 2G Ex ib IIC T4, for use in Zone 1 and 2 hazardous gas atmospheres, where the NT.2 isn't rated.
Can a portable gas flow meter be used in a hazardous area?
Yes, with the flowtherm Ex, which is ATEX certified II 2G Ex ib IIC T4 for Zone 1 and 2 gas atmospheres. Confirm your site's gas group and temperature class against this rating before deployment, since not every hazardous area classification matches it.
Does the flowtherm unit include its own sensor?
No, it's an evaluation unit that accepts several Höntzsch probe types, including vortex VA sensors, connected separately. You choose the probe to match your duct size and flow range, and the flowtherm unit processes, displays and logs the signal from whichever probe is attached.
What jobs is a handheld flowtherm meter suited to?
Air and gas consumption audits, commissioning new installations, checking fixed flow meters already in service, and measuring exhaust or process gas flows during a site survey. It suits spot and periodic checks rather than continuous, permanently wired monitoring.
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