-
Technical Specifications
| Structural form | Insertion type | Inline type |
| Nominal diameter | DN65～ DN1000 | DN10～ DN300 |
| Velocity range | ( 0.1～100 ) Nm/s | |
| Accuracy | ±2.5% | |
| Response time | 1s | |
| Transmitter output | (4 ~ 20) mA , photoelectric isolation, maximum load 500 Ω | |
| Communication output | RS485 interface, photoelectric isolation , Mod bus protocol | |
| Hart | ||
| Alarm | 1 ~ 2 line Relay, Normally Open state | |
| Power supply | AC 220V/ DC 24V, power supply should be greater than 18W | |
| Power consumption | ≤7W | |
| Measuring medium | Common steady-state gas ( medium moisture content less than 5% ) Note: Unstable media such as acetylene and boron trichloride cannot be measured | |
| Operating temperature | Sensor: (-40 ～ 300 ) ℃ Converter: ( -20 ～45 ) ℃ | |
| Work Pressure | Medium pressure ≤2.5MPa | Medium pressure ≤1.6MPa |
| Display | 4 lines LCD: Mass flow, Volume flow in standard condition, Flow totalizer, Date and Time, Working time, and Velocity, etc. | |
| Protection level | IP65 | |
| Sensor Material | Stainless steel | Stainless steel, carbon steel |
-
Applications
The Thermal Gas Mass Flow Meter is widely used in industrial gas flow measurement and monitoring systems, including:
-
Compressed air flow measurement
-
Natural gas flow monitoring
-
Industrial gas consumption measurement
-
Gas leak detection systems
-
Boiler air supply measurement
-
Combustion air monitoring
-
Ventilation and exhaust gas monitoring
-
Chemical plant gas flow control
-
Power plant gas monitoring
-
Semiconductor and industrial gas distribution systems
Its ability to directly measure gas mass flow without temperature and pressure compensation makes it particularly suitable for industrial gas management and energy efficiency monitoring.
-
Why Choose This Thermal Gas Mass Flow Meter
-
Reliable thermal dispersion measurement technology
-
High accuracy across wide gas velocity range
-
Long service life with no moving parts
-
Easy installation and maintenance
-
Suitable for industrial automation integration
-
Measuring principle
The meter operates using the thermal dispersion method.
Inside the sensor, two platinum resistance temperature sensors are installed:
-
One sensor measures the actual gas temperature.
-
The other sensor functions as a heater and is maintained at a constant differential temperature (typically 30°C higher than the gas temperature).
As gas flows across the heated sensor, it removes heat due to the cooling effect. The higher the gas velocity, the greater the cooling effect and the more power required to maintain the constant temperature difference.
The required heater power is proportional to the gas mass flow rate.
The relationship between gas velocity and heater power can be expressed as:
-
ρg – specific gravity of medium
-
V – velocity
-
K – balance coefficient
-
Q – heater power
-
ΔT – differential temperature
Because the sensor temperature is always maintained at approximately 30°C above the medium temperature and the meter uses constant differential temperature control, temperature and pressure compensation are not required in principle.
