Thermal Mass Flow Meter

$ 2,187.50$ 6,000.00

A Thermal Mass Flowmeter works by measuring the total mass flow rate of a fluid flowing through a pipe or duct.  In a thermal flowmeter’s simplest working configuration, fluid flows past a heated thermal sensor and a temperature sensor.  As the molecules of the fluid flow past the heated thermal sensor, heat is lost to the flowing fluid.

Thermal mass flow meter, also known as thermal dispersion or immersible mass flow meters comprise a family of instruments for the measurement of the total mass flow rate of a fluid, primarily gases, flowing through closed conduits.  A second type is the capillary-tube type of thermal mass flow meter.  Many mass flow controllers (MFC) which combine a mass flow meter, electronics and a valve are based on this design.  Furthermore, a thermal mass flow meter can be built by measuring temperature differential across a silicon-based MEMS chip.


A Thermal Mass Flow Meter is suitable for all industrial and test platform applications that require fast, accurate gas measurement.  Moreover, the flowmeter directly indicates the mass flow or standardized volume flow of the gas without any additional pressure and temperature compensation.  Additionally, they have impressive high accuracy, short response times, and a very wide flow range, with almost no loss of accuracy even at the lowest flow.

Thermal mass flow meter
  • Direct measurement of gas mass flow without any temperature or pressure compensation
  • ± 1.0% high accuracy, fast response time, and very wide flow range.  In addition, even at the lower limit of the flow range, the accuracy is still very good.
  • Applications:  Industrial plants, oil, and gas upstream and downstream production, water and wastewater treatment plants, etc.


Product introduction

A Thermal Mass Flow Meter is suitable for all industrial and test rig applications that demand quick and precise gas measurement.  Also, the Flow Meters directly indicate the mass flow or normalized volume flow of gases without any additional pressure and temperature compensation.  They have impressively high accuracy, short response time, and a very wide flow range with virtually no loss of accuracy even at the lowest flow rates.


Touch screen transmitter: 

We have our own patented touch screen transmitters with DSP core processor with faster data processing speed.


Insertion Type; Pipeline Type: 

For the pipeline size below DN65, it is recommended to use the pipeline type.  Moreover, while for the pipeline size higher than DN65, it is recommended to use the insertion type.



Also, 4-20mA, Standard RS 485 communication protocol, and HART Protocol



The connections can be customized, including flanges, threaded connections, etc.  Furthermore, we will also include the ball head along with the thermal flow meters.



We are providing the new generation of DSP transmitters with faster data processing.



Finally, the sensor of thermal mass flow meters includes two sensors.  While one is to heat the air, and the other one is to sense the heat took away by the flowing of air.


Additional information

Weight 12 lbs
Dimensions 24 × 14 × 14 in

3/4", 1", 1-1/2", 2", 3", 4"

Pressure Class

150LB, 300LB, 600LB


NPT, Flanged, Triclamp


Yes, No


24 VDC, 120 VAC

Communication Protocol



4-20 MA, 0-10 VDC


Explosion Proof, Intrinsically Safe



Currently no product agency approvals.

Enclosure Certifications by manufacturer
US – CL. I. GR. A,B,C,D; CL. II. GR. E,F,G; CL. III.;TYPE 4X
IECEx – Ex d IIC Gb, Ex t IIIC Db,
ATEX – II 2G Ex IIC Gb, II 2Dd Ex t 111C Db

Linear signal output
0–5 VDC & 4–20 mA (Flow and Temperature)

Event Relay Rating one with Frequency or two, 1 Amp @ 30Vdc (33W)

Signal Interface
RS232 & RS485 Modbus RTU embedded, Optional HART or Profibus DP, LCD (flow rate, flow total, gas temperature)

Accuracy, including linearity (Ref.: 21°C)
±(1% of Reading + 0.5% of Full Scale + GTC)

±0.2% of Full Scale

Sensor response time
1 second to 63% of final value

Turn down ratio
100:1 @ 10 SFPM (.051 NMPS) Minimum Reading

Electronics PCB temperature range
-40° to 158°F (-40° to +70°C)

Environmental temperature range
-40° to 140°F (-40° to +60°C)

Gas temperature range
-40°–392°F (-40°–200°C)

Gas temperature coefficient (GTC)
0.02% Full Scale/°C

Gas pressure effect
Negligible over ± 20% of absolute calibration pressure

Pressure rating maximum
500 PSI Std.

Input power requirement
24VDC @ 250mA, 115 VAC 50/60 Hz optional, 230 VAC 50/60 Hz optional

Flow Transmitter power requirements
5 watts maximum

RAM Back-up
Lithium Battery

Wetted materials
316 Stainless Steel (Hastelloy optional)

Standard temperature & pressure (STP)
70°F & 29.92″ Hg (Air .075 lb./cubic foot)

NIST traceable calibration

NOTE: Specifications subject to change without notice.



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