Thermal Gas Flow Meter Supplier in Bangladesh
Digital thermal mass flow meters from Smart Measurement and TECHANGE for compressed air, nitrogen, biogas and natural gas lines, supplied with installation support by Techno Bangla Creation.
What Is a Thermal Gas Flow Meter?
A thermal gas flow meter, also called a thermal mass flow meter, measures how much gas flows by heat transfer. One sensor is heated, and the moving gas carries heat away from it. The more gas flows, the more heat it removes, so the meter reads mass flow directly with no moving parts.
It is not a vortex or turbine meter. Those measure gas volume, so they usually need extra temperature and pressure readings to find mass. A thermal meter reads mass flow directly, but it must be calibrated for the gas you measure. For steam, see our vortex flow meter. For liquids, see the electromagnetic flow meter.
- Thermal insertion probe with a remote monitor
- No moving parts and very low pressure drop
- 4-20 mA output, with RS485 as an option
- Installation and after-sales support in Bangladesh
Thermal Gas Flow Meter Specifications
- Type
- Thermal insertion mass flow meter
- Monitor
- Remote type
- Size
- 25 ~ 300 mm (about 1 ~ 12 inch)
- Max. Temperature
- -20 ~ 250 °C
- Max. Pressure
- 1.6 MPa (16 bar, about 232 psi)
- Body Material
- Stainless steel (SS)
- Output
- 4 ~ 20 mA single output. RS485 optional.
- Power Supply
- 220 Vac, 50 Hz
- Brand
- Smart Measurement Co, Ltd, TECHANGE
- Origin
- USA, China
Accuracy, turndown, gas calibration and probe length depend on the model. Send us your gas, pipe size and flow range and our engineers will confirm them on the datasheet.
How Does a Thermal Mass Flow Meter Work?
- Probe Enters the PipeAn insertion probe with two temperature sensors sits in the gas stream.
- One Sensor Is HeatedThe meter heats one sensor above the gas temperature, which the second sensor tracks.
- Gas Carries Heat AwayMoving gas cools the heated sensor. More flow means more cooling.
- Power Shows Mass FlowThe power needed to hold the temperature gap is a measure of mass flow.
- Transmitter Sends the SignalThe remote monitor shows flow and sends 4-20 mA, or RS485 if fitted.
Key Benefits of Thermal Gas Flow Meters
Gas is a utility cost. A meter turns an estimate into a number you can act on.
- Direct mass flow, so no separate temperature and pressure transmitters for the flow reading
- Wide turndown, often quoted near 100:1, so it reads low and high flow
- Very low pressure drop, which protects compressor and blower energy
- No moving parts, so wear and routine maintenance stay low
- Insertion probe suits existing pipes without cutting in a full meter body
- Local engineering and after-sales support from Techno Bangla
When Should You Choose a Thermal Gas Flow Meter?
Choose a Thermal Meter When
- You measure compressed air, nitrogen, biogas or natural gas
- You need mass flow, not just volume
- Flow is low or varies widely
- The gas is clean and fairly dry
- Low pressure drop matters
Choose Another Meter When
- The medium is steam. Use a vortex flow meter.
- The gas is wet, with condensed water in the line
- Gas composition changes often and cannot be calibrated for
- The line has no straight run and you cannot fit a flow conditioner
- Clean gas runs at steady, high volume. See our turbine gas flow meter.
Where Are Thermal Gas Flow Meters Used?
Any clean gas line where mass flow and low pressure drop matter.
- Compressed Air Systems
- Nitrogen, Argon and CO₂
- Biogas
- Natural Gas to Burners and Boilers
- Aeration Air in ETP and STP
- Boiler Combustion Air
- Emission Monitoring
- Pharmaceutical
- Chemical Processing
- Textile Mills
How to Choose the Right Thermal Gas Flow Meter
Share these details with our engineers and we will recommend a suitable model and probe length.
- Gas type and composition. A thermal meter reads correctly only for the gas it is calibrated for. Biogas and natural gas need their own calibration, and a changing mix lowers accuracy.
- Flow range. Give us minimum, normal and maximum flow. The meter must be calibrated across the low end if you run at low flow.
- Pipe size and straight run. Insertion meters usually need about 15 to 20 pipe diameters upstream and 5 to 10 downstream. A flow conditioner reduces this.
- Moisture and dirt. Condensed water hurts accuracy. In humid Bangladesh, fit the probe after the air dryer and filter, and avoid low points where water collects.
- Outputs and power. Choose 4-20 mA or RS485 for your PLC or SCADA, and plan for a stable 220 Vac supply. Ask about hazardous-area needs for biogas.
Frequently Asked Questions
What is the difference between Nm³/h and m³/h on a gas flow meter?
m³/h is the volume at the pipe’s actual temperature and pressure. Nm³/h is the volume converted to standard conditions, so it is comparable across plants and times. A thermal meter reads mass flow, so it shows standard-condition flow without separate temperature and pressure correction. Tell us which unit your plant bills or reports in.
Thermal vs vortex vs differential pressure flow meter: which is better?
None wins in every case. Thermal meters read mass flow directly and handle low flow well. Vortex meters suit steam and higher velocities. Differential pressure meters suit high-pressure, high-flow lines. Choose by gas, flow range and moisture, and confirm values on the datasheet.
Does a thermal flow meter need temperature and pressure compensation?
No separate temperature or pressure correction is needed to get mass flow, because the meter senses heat transfer from gas molecules. It still needs the right gas calibration, and condensed moisture or a changing gas mix can reduce accuracy. Confirm the calibration gas for your model.
Which gases can a thermal flow meter measure?
Thermal meters measure air, nitrogen, argon, carbon dioxide, natural gas and biogas. Each needs a matching calibration, and a mixed or changing gas lowers accuracy. Oxygen and hazardous gases need extra suitability checks. Tell us your gas and we will confirm the meter and calibration.
How accurate is a thermal mass flow meter?
Makers of premium thermal meters quote about ±0.5 to ±1% of reading, with turndown often up to about 100:1. Real accuracy depends on calibration, gas, flow profile and installation. Check the accuracy statement and flow range on the datasheet of the exact model.
How do I install an insertion thermal flow meter?
Mount the probe in a straight pipe run, usually about 15 to 20 pipe diameters upstream and 5 to 10 downstream, and set the probe depth as the manual states. With less straight pipe, a flow conditioner can help. Avoid fitting it right after valves or bends.
Is a thermal gas flow meter suitable for humid Bangladesh?
Yes, if you control condensation. Condensed water on the sensor lowers accuracy, so fit the probe after the dryer and filter and away from low points. Tell us your air or gas quality and line layout, and our engineers will advise the best installation point.
What sizes do you supply and how do I get a quotation?
Our thermal insertion meters cover pipe sizes from 25 to 300 mm, up to 1.6 MPa and -20 to 250 °C. Send your gas, pipe size and flow range by phone or email, and our engineers will reply with a free quotation for your plant or utility line.
