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DN65-DN1000 Thermal Mass Flow Meter

Thermal mass flow meter is designed based on the principle of thermal diffusion. Structure form of this flow meter is plug-in type. Thermal gas mass flow meter has the advantages of small size, high degree of digitization, convenient installation and accurate measurement.
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Delivery date: 7-12 days

A thermal gas mass flow meter is a type of flow meter that measures the flow rate of gases in a pipeline. The flow rate is calculated based on the difference in temperature between the upstream and downstream sides of the sensor, and the thermal conductivity of the gas being measured.

Thermal mass flow meter detail one

High quality components make the measurement stable

  • The thermal mass flowmeter has a wide range ratio, which makes the measurement more stable.
  • A variety of signals, to achieve automation.
Thermal mass flow meter detail two

Adopts with stainless steel material

  • The flowmeter is made of 304 stainless steel, which is resistant to corrosion and oxidation.
  • All metal structure and no moving parts.


The flow meter calculates the mass flow rate of the fluid based on the power required to maintain the constant temperature difference. Thermal mass flow meters are commonly used in applications where precise measurement of gas flow is required, such as in biotechnology, medical equipment, scientific research, chemical and petrochemical industry.

Thermal mass flow meter application

Structural Form plug-in type
Measuring Medium common steady state gas
Pipe Diameter Range DN65-DN1000
Velocity Range 0.1-100 Nm/s
Accuracy ±2.5%
Working Temperature sensor: -40 ℃ ~ 300 ℃; converter: -20 ℃ ~ 45 ℃
Pressure ≤2.5 MPa
Power Supply AC 220V; DC 24V
Response Speed 1s
Output Signal 4-20 mA, RS485
Alarm 1-2 normally open contacts
Display liquid crystal display
Sensor Material stainless steel
Level of Protection IP65


Dimension (Unit: mm)

Thermal mass flow meter dimension

Port Size A B
DN65-DN200 431mm 250mm
DN200-DN500 551mm 370mm
DN500-Dn1000 811mm 630mm

Q1: Can a thermal mass flow meter have perfect accuracy?
A1: In an ideal world, the flow readings from your process meter would be exactly correct, without any type of deviation. Unfortunately, this is not the case, and the errors inherent in measurement must always be identified, accounted for, and minimized as much as possible.

Q2: Does a thermal mass flow meter need to be calibrated?
A2: During the production of a flow meter, several steps are required such as coil winding, lining processing, and electrode assembly. This series of operations can cause a certain amount of error and dispersion in the device, so a calibration process is required to correct the accuracy.

Q3: Do thermal mass flow meters have temperature compensation?
A3: Yes. As long as these temperature variations are within the temperature compensation range, the output reading compensates for the temperature variations.

Tips: Thermal mass flow meter installation tips

  • If the instrument is installed outdoors, it should be equipped with a sun shield to protect it from the sun and rain.
  • Do not install in the place of strong vibration.
  • Do not expose to environments containing large amounts of corrosive gases.
  • Do not share the power supply with the equipment that pollutes the power supply, such as frequency converter and welding machine.

Thank you for buying industrial test and measurement equipment on, all products sold by sisco and the partner cover a 12 months warranty, effective from the date of receiving the products.

What is covered?

sisco is responsible for providing free spare parts, and free technical support to assist the customer to repair the defective products until the problem is solved.

What is not covered?

  • Product purchased from anyone other than a sisco store or a sisco authorized reseller.
  • Expendable parts.
  • Routine cleaning or normal cosmetic and mechanical wear.
  • Damage from misuse, abuse or neglect.
  • Damage from use of parts other than sisco approved.
  • Damage from use outside the product’s usage or storage parameters.
  • Damage from use of parts not sold by sisco.
  • Damage from modification or incorporation into other products.
  • Damage from repair or replacement of warranted parts by a service provider other than a sisco authorized service provider.
  • Damage caused by the application environment not meeting the product usage requirements and the failure to perform preventive maintenance.
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