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Flowmeters

Thermal Mass Flowmeter

For compressed air, flare gas, ventilation and stable gas measurement.

Thermal mass flowmeters measure gas mass flow directly and are often considered for compressed air, flare gas, ventilation and multi-component gas applications after gas composition and operating range are checked.

Velomac thermal mass flowmeter options on clean background
Industrial gas utility line for thermal mass flowmeter application context

Where It Is Used

Application Context

Used for compressed air and industrial gas monitoring where gas composition and normal operating range can be confirmed.

Compressed air monitoring

Flare gas measurement

Ventilation systems

Blast furnace air flow

Multi-component gas applications

Selection Notes

Conditions to Confirm

A useful quotation starts with the real operating condition, not only the model name.

Media

Compressed air, Flare gas, Ventilation air, Stable gas

Flow range

Share minimum, normal and maximum flow before sizing.

Pressure / temperature

Confirm operating and design conditions.

Pipe size

Send DN, connection type and available straight pipe.

Installation condition

Note vibration, access limits, pipe layout and shutdown limits.

Output / signal

Confirm local display, 4-20mA, pulse, RS485 or other site needs.

Typical Applications

Related Site Conditions

Compare the product with nearby application scenarios before sending site details.

Available configurations

Wafer Thermal Mass FlowmeterFlanged Thermal Mass FlowmeterInsertion Thermal Mass Flowmeter

Direct gas mass measurement

Direct mass flow measurement can be reviewed without separate temperature and pressure compensation sensors.

Insertion and in-line options

Insertion and in-line installation types cover a broad line size range when process conditions are confirmed.

Gas range selection

Flow range depends on line size and gas type, including air, oxygen and combustible gas service.

Before Quotation

What to Send

These details help Velomac recommend a suitable meter configuration and avoid a model-only quotation.

Fluid / media
Pipe size / DN
Flow range
Pressure
Temperature
Quantity
Installation details
Signal output

Technical Data

Data for Configuration Review

Thermal Mass Flowmeter Technical Data

ParameterSpecification
Installation TypeInsertion or in-line
Measuring MediaCommon stable gases; consultation required for reactive media such as acetylene or boron trichloride
Line Size (DN)Insertion: DN65-DN4000; in-line: DN15-DN2000
Flow Velocity0.1 to 120 Nm/s
Accuracy+/-1.0% to +/-2.5% of reading
Temperature RatingProcess sensor: -40 deg C to 450 deg C; transmitter ambient: -20 deg C to 45 deg C
Pressure Rating (PN)Insertion: <= 4.0 MPa; in-line: <= 1.6 MPa; higher ratings customizable on request
Power Supply24V DC, >= 18W
Response Time1 second
Output Signal4-20mA optically isolated, max load 500 ohm; RS485 optically isolated
Alarm Output1 to 2 normally open contacts, 24V / 0.5A
Compatible Pipe MaterialsCarbon steel, stainless steel, plastics and others
Local Display4-line LCD display
Ingress ProtectionIP65, IP67, IP68
Wetted Parts MaterialInsertion: stainless steel; in-line: stainless steel or carbon steel

Selection note: Confirm final configuration against gas type, flow range, pressure, temperature and site details.

Selected Thermal Mass Flow Range

Line Size (DN)Air standard range (Nm3/h)Air extended range (Nm3/h)Oxygen range (Nm3/h)
100.5-280.03-300.5-14
250.5-1750.18-1800.5-89
501-6000.5-7000.7-352
1003-23003-28003-1420
20012-900012-1150012-5650
50070-5700070-7000070-35300
1000290-230000290-280000290-140000
20001150-900000Confirm during sizing1150-560000

Selected flow ranges are shown for orientation. Final sizing depends on gas type, flow range, pressure, temperature and site details.

Selection support

Send site details for a better recommendation.

Share the fluid, pipe size, flow range, pressure, temperature, quantity, installation details and signal output needs.

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Industrial gas utility line for thermal mass flowmeter application context