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Separated Thermal Mass Flowmeter
INTRODUCTION
Thermal mass flow meter contains two platinum resistance temperature sensors. The thermal principle operates by monitoring the cooling effect of a gas stream as it passes over a heated sensor. Gas flowing through the sensing section passes over two sensors one of which is used conventionally as a temperature sensor, whilst the other is used as a heater. The temperature sensor monitors the actual process values whilst the heater is maintained at a constant differential temperature above this by varying the power consumed by the sensor. The greater the gas velocity, the greater the cooling effect and power required to maintain the differential temperature. The measured heater power is therefore a measure of the gas mass flow rate.
TECHNICAL DATA
Suitable Diameter | DN15~DN400mm (flange) DN65~DN3000mm (Insertion type) |
Medium | Various gases (Except the acetylene) |
Velocity | 0.1~100 Nm/s |
Accuracy | ±1.5% |
Working Temperature Snesor: | -40~220℃ |
Transmitter: | -20~45 ℃ |
Working Pressure | 1.0- 4.0MPa |
Power Supply | 24VDC+ 220VAC dual power supply |
Flow unit | Nm3/h, Nm3/min, Nl/h, Nl/min, t/h, t/min, kg/h and kg/min |
Output | 4~20mA, Pulse, RS485, HART |
Display | 4 lines LCD |
Mass flow, volume flow in standard condition, flow totalizer, data and time, working time, and velocity, etc | |
Protection Class | IP65, IP68 |
Sensor material | SS304, SS316(optional) |
FEATURE
◆Measuring the mass flow or volume flow of gas.
◆Do not need to do temperature and pressure compensation in principle with accurate measurement and easy operation.
◆Wide range: 0.1Nm/s~100Nm/s for gas. The meter also can be used for gas leak detection.
◆Good vibration resistance and long service life. No moving parts and pressure sensor in transducer, no vibration influence on the measurement accuracy.
◆Digital design, high accuracy and stability.
◆Configuring with RS485 or HART interface to realize factory automation and integration.
APPLICATION
Oxygen, nitrogen, hydrogen, chlorine and multi-component gas measurement.
Blast furnace gas, coke oven gas measurement.
Flue gas measurement.
Measurement of aeration and chlorine in methane and water treatment.
Compressed air measurement.
Gas flow measurement, such as natural gas, liquefied gas, flare gas etc.
Measurement of primary, secondary air flows of blast furnace in power plants.
Measurement of ventilation or exhaust system flow in mines.
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