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MEGA-TMF300-I insertion type

Insertion Thermal Gas Mass Flowmeter (MEGA-TMF300-I)

Item No.: 14
Thermal mass flowmeter, also known as a thermal dispersion or immersible mass flowmeters, are precision instruments used to measure the mass flow of fluid flowing in a closed channel like a pipe or a duct.
Description Specifications Structure Drawing

The MEGA-TMF300-I Series is the top selling meter in our Product Line. The MEGA-TMF300-I Series thermal gas mass flowmeter features a bright, high contrast display of flow rate and temperature. It is powered by 24VDC or 220VAC.

The MEGA-TMF300-I Series thermal gas mass flowmeter is offered in Integral or Remote style. Specify any standard probe length of flow body size. It has a 4-20mA output as well as a pulse output of totalized flow. In addition, MEGA-TMF300-I supports full Modbus compliant RS485 RTU communication.


  • Isolated 4-20mA output and pulse output
  • Modbus compliant RS485 RTU communications or HART
  • Available in 220VAC or 24VDC
  • Measures process gas flow rate/total flow and temperature
  • Insertion probes: for 2’’ to 80’’ pipe
  • Wide measurement range
  • Flow accuracy for gases: ±1.0%
  • Working temperature can be up to 350℃
  • It has more compact design, which means smaller enclosure and thinner insertion tube probe
  • Wide Turndown ratio 100:1
  • Cost-effective model



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Line Size 50-2000mm
Velocity range 0.1~120Nm/s
Accuracy ±1.0%
Process temprature Standard: -20~+150℃,  Option: -25~+350℃
Rated pressure 1.6MPa (standard), 2.5MPa, 4.0MPa, high pressure can be customized
Turn down ratio over 100:1
Response speed 1s
Structure Compact or Remote 
Sensor material Standard: SS316L, Option: Hastelloy
Didsplay Instantaneous flow, Total flow, Fluid temp, Cumulative running time
Measuring unit NCMH(Nm3/h), KGH(kg/h), NLPM(NL/min), KGM(kg/min)
Signal output 4-20mA (std), Pulse (opt)
Communication Modbus compliant RS485 RTU, HART
Power supply 24VDC or 220VAC (power consumption is less than 10W)
Explosion ExdIICT4Gb
Protection Transmitter IP67, Sensor IP68
Process connection G3/4” small ball valve
G1 1/2” big ball valve
G1 1/2” big ball valve (can be installed under pressure)