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Home / Products / Thermal Mass Velocity Flow Meter
Thermal Mass Velocity Flow Meter — real BROIL product photograph
HEAT TRANSFER — VELOCITY FLOW METER

Thermal Mass Velocity Flow Meter

Heat lost to the gas becomes the flow rate.

The thermal mass flow meter operates on the principle of thermal dispersion — gases conduct heat differently than other substances. The meter carries two temperature sensors: a heated sensor and a reference sensor, maintaining a constant temperature difference between them. As gas flows through the meter it cools the heated sensor, and the flow rate is directly proportional to the amount of cooling. Measuring the temperature difference between the two sensors gives the gas flow rate directly.

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Sensor housing
SS-316 / Hastelloy / PTFE coated
Velocity
±0.1 ~ 100 Nm/s
Accuracy (standard position)
±1%
Fluid & ambient temperature
-20 to 240°C
01 · Performance

Performance Data

Designed for pipe sizes DN15 to DN4000, measuring flow rates from 1 to 7,00,000 Nm³/h — a wide spectrum suited to applications needing precise flow data.

02 · Where it's used

Markets & Areas of Application

Primarily used for measuring the flow of gases — air, natural gas, nitrogen and other process gases — without needing recalibration for composition changes. Common in chemical processing, HVAC systems and environmental monitoring.

03 · Why choose it

Advantages

✓Direct mass flow measurement, critical where mass flow is a key parameter
✓No moving parts in contact with the fluid
✓High turndown ratio for wide flow-rate ranges
✓Fast response time, real-time measurement
✓Low pressure drop
04 · Build & specification

General Specification

Sensor housing
SS-316 / Hastelloy / PTFE coated
Velocity
±0.1 ~ 100 Nm/s
Accuracy (standard position)
±1%
Fluid & ambient temperature
-20 to 240°C
Connection
Insertion type / Flange end
Model range

Choose your model

15
Max Flow Rate (Nm³/hour): 65
25
Max Flow Rate (Nm³/hour): 175
32
Max Flow Rate (Nm³/hour): 290
40
Max Flow Rate (Nm³/hour): 450
50
Max Flow Rate (Nm³/hour): 700
65
Max Flow Rate (Nm³/hour): 1200
80
Max Flow Rate (Nm³/hour): 1800
100
Max Flow Rate (Nm³/hour): 2800
Show all 23 models →
125
Max Flow Rate (Nm³/hour): 4400
150
Max Flow Rate (Nm³/hour): 6300
200
Max Flow Rate (Nm³/hour): 10000
250
Max Flow Rate (Nm³/hour): 17000
300
Max Flow Rate (Nm³/hour): 25000
400
Max Flow Rate (Nm³/hour): 45000
500
Max Flow Rate (Nm³/hour): 70000
600
Max Flow Rate (Nm³/hour): 100000
700
Max Flow Rate (Nm³/hour): 135000
800
Max Flow Rate (Nm³/hour): 180000
900
Max Flow Rate (Nm³/hour): 220000
1000
Max Flow Rate (Nm³/hour): 280000
1200
Max Flow Rate (Nm³/hour): 400000
1500
Max Flow Rate (Nm³/hour): 600000
2000
Max Flow Rate (Nm³/hour): 700000
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