Thermal Gas Mass Flow Meter
Introduction
Thermal gas mass flow meter is designed on the basis of thermal dispersion, and adopts method of constant differential temperature to measuring gas flow. It has advantages of small size, easy installation, high reliability and high accuracy, etc. The 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.
Specification
| Suitable Diameter | DN10~DN4000mm |
| Medium | Various gases (Except the acetylene) |
| Velocity | 0.1~100 Nm/s |
| Accuracy | ±1~2.5% |
| Working Temperature | Snesor: -40~220 C Transmitter: -20~45 C |
| Working Pressure | Insertion Sensor: medium pressure≤ 1.6MPa Flange Sensor: medium pressure≤ 1.6MPa Special pressure please contact us |
| Power Supply | Compact type: 24VDC or 220VAC, Power consumption ≤18W Remote type: 220VAC, Power consumption ≤19W |
| Response Time | 1s |
| Output | 4~20mA (optoelectronic isolation, maximum load 500Ω), Pulse, RS485 (optoelectronic isolation) and HART |
| Alarm Output | 1-2 line relay, normally open state, 10A/220V AC or 5A/30V DC |
| Sensor Type | Standard Insertion, hot-tapped Insertion and flange |
| Construction | Compact and Remote |
| Pipe Material | Carbon steel, stainless steel, plastic, etc |
| Display | 4 lines LCD Mass flow, volume flow in standard condition, flow totalizer, data and time, working time, and velocity, etc |
| Protection Class | IP65 |
| Sensor Housing Material | Stainless Steel(316) |
Feature
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Measuring the mass flow or volume flow of gas
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Do not need to do temperature and pressure compensation in principle with accurate measurement and easy operation.
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Good vibration resistance and long service life. No moving parts and pressure sensor
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In transducer, no vibration influence on the measurement accuracy.
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Easy installation and maintenance. If the conditions on site are permissible, the meter can achieve a hot-tapped installation and maintenance. (Special order of custom-made)
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Digital design, high accuracy and stability
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Configuring with RS485 or HART interface to realize factory automation and integration
Application
Thermal gas mass flow meter has very wide application:
1. Public works-monitoring of electricity, gas and water treatment Pipeline gas; general system; biogas; coal gas; natural gas; liquefied gas; boiler preheated air.
2. Oil and gas industry Energy exchange; well-filling gas recovery; gas metering; gas quality analysis; leaking gas testing; natural gas measurement; flare gas monitoring.
3. Power industry Gas measurement in the process of gas distribution in fuel systems; measurement of various gases in boilers and auxiliary systems; gas measurement in gas furnaces; argon measurement; measurement of primary air and secondary air in blast furnaces of power plants.
4. Chemical industry Flue gas circulation monitoring; gas flow measurement in sampling system; gas flow measurement of induced draft fan; ammonia measurement in fertilizer plant; various gas flow measurement in battery plant.
5. Metallurgical industry Gas filling measurement in steel plants; blast furnace gas measurement in ironworks; coke oven gas measurement in coking plants; measurement and control of heating furnace gas (blast furnace gas, coking gas, natural gas, etc.) in rolling mills; hydrogen, oxygen, and oxygen in heat treatment quenching furnaces, etc. Control of gases such as nitrogen.
6. Pulp and paper industry Gas measurement in wastewater treatment system; flue flow monitoring; boiler recovery secondary/tertiary air; boiler gas and air supply air measurement.
7. Food and pharmaceutical industry Addition of fresh air in processing operations; carbon dioxide treatment in breweries; hot air flow in bottle sterilizers; gas flow measurement during thermal oxidation; ventilation system; process control of boiler intake and exhaust gas.
8. Environmental protection Gas measurement in the process of biogas utilization; chlorine gas measurement in the chlorine treatment process; gas measurement in the aeration tank in the sewage treatment process; flue gas exhaust detection S02 and NOX emissions.
9. Other industries Factory compressed air measurement; pulverized coal combustion process powder/gas ratio control fuel; cement industry vertical mill exhaust hot gas flow control.
