Thermal Mass Flow Meter

thermal mass flow meter
Thermal Mass Flow Meter is accurate, easy to install, having no moving parts and best suitable solution for measuring and controlling compressed Air, oxygen, nitrogen, biogas, digester gases,  ethane and natural gas flow. Heat dispersion (mass flow) technology to provide proportional mass flow measurement resulting in higher accuracy performance at a lower cost than orifice flow meter, Vortex shedding flow meter and other gas flow measuring devices.

Operating Principle:

The thermal principle operates by observing the cooling effect of a gas flow as it passes over a heated transducer. The temperature sensor monitors the actual gas temperature whilst the heater transducer is maintained a constant differential temperature by caring the required current from electronic to maintain the differential temperature. Greater the flow, greater will be cooling effect and power required to maintain the differential temperature. The energy required maintaining this temperature differential is directly proportional to the mass flow rate. Thus, there is no need for additional temperature or pressure compensation in thermal mass flow meter. This meter is also used for compressed air flow measurement.


Good level of accuracy at an economical price

Wide flow rangeability including low flow rates

Simple, durable construction

Easy to install and maintain

Flexible connection to flow instruments for flow control

Wide variety of process connections

Turn down ratio 100:1

Low pressure drop across the flow meter

Provides a convenient signal output

  • Accuracy 98.5%
  • Maintanance 100%
  • User Friendly 100%

Silent Features

Accuracy +/- 1.5 % FSD

Micro controller based design

12 X 2 LCD display

Instant Flow Rate Indicator

Totalizer for commutative flow indication

Zero reset feature with password protection system

4-20mA Transmitter/alarm Output – Configurable

Power Supply 24 vdc

Flame Proof Enclosure CMRI certified

Inline mode from DN 15 up to DN 200

Insertion mode from DN 50 up to DN 2000

Application by Gas type

Options available in Thermal Mass Flow Meter:

with field mounted flow rate indicator, totalizer, 4-20 ma output transmitter

offline thermal/dot matrix printer

with gsm modem

with rs 232 communication

with rs 485 communication

with data logger & pc software

with field mounted flow rate indicator, totalizer

flow meter with offline thermal/dot matrix printer

Insertion thermal dispersion mass flow meter

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Nominal sizeDn15, DN20, DN25, DN40, DN80, DN100, Dn150 / DN 2000 INSERTION TYPE

Process connection: BSP threaded, DIN & ANSI fanged; other on request eg , ti-clamp, NPT

Flange rating : PN 16, 40, 100 (BS EN 1092-1); ANSI 150, 300, 600 RF (ANSI B16.5)

Compatibility: Air, Oxygen, Nitrogen, Argon, Hydrogen, Natural Gas, Butane, Compressed Air Co2 Gas, Ammonia, Ethane, Helium, Methane

Flow range: 0 to 2500 CFM

Operating temperature: -40 to 150 C

Max operating pressure: 10 bar

Output: 4-20 mA , 3.5-10 volt

Communication: RS 485

Pressure drop: Very low (in term of water column)

Accuracy: 1.5%

Repeatability: ±0.5% of reading

Materials: Body: 304 stainless steel (standard); 316 (optional); other materials available on request

Sensor MOC: Platinum Winding encapluted in SS316L

Enclosure: Die-cast Aluminum

Installation: Horizontal or vertical flow

Approvals: CMRI Certified to gas group IIA, IIB