QE600 series hot gas mass flowmeter  First, the principle of thermal gas flowmeter    Thermal mass flow meter using the principle of thermal diffusion, thermal diffusion technique is a kind of good performance under severe conditions, high-reliability technology. Which typically comprises two sensor element in the thermal resistance (the RTD platinum), a speed sensor, a gas temperature variation is automatic compensation temperature sensor. When two RTD medium is placed, wherein the speed sensor is heated to above ambient temperature to a constant temperature, a further temperature sensor for sensing the medium temperature. The mass flow of gas flowing through the speed sensor is calculated by the amount of heat transfer from the sensing element. As the gas flow rate increases, the amount of heat removed by the media increases. Causes the sensor temperature to decrease. In order to keep the temperature constant, the operating current through the sensor must be increased. This increased portion of the current is proportional to the flow rate of the medium.  Second, thermal mass flowmeter introduction:    At present, China used gas flowmeter range than there are minor problems, flow range below the lower limit of the basic loss, but this is unacceptable in certain areas, it is intolerable thermal gas mass flow meter in gas and other trade settlement occasions Solved this problem satisfactorily. 1 thermal gas mass flowmeter features   QE600 series of hot gas mass flow meter the gas can flow metering work, also be used for process control. It introduces advanced technology from the United States to produce, without the need for temperature and pressure compensation, directly measuring the mass flow of the fluid. Its salient features are: no moving parts; pressure loss; range than the width; high precision; high reliability; easy to install and operate. The orifice plate and differential pressure flow meter can be completely replaced in all fields . 2. Thermal Mass Flow Meter Usage :    This product is widely used in steel mills, coking plants, petroleum, chemical, thermal power, medical, thermal power plants, environmental protection and other industries. Can be done: Steel plant, coke plant gas flow measurement Boiler air flow, measurement of secondary air volume Flue gas flow measurement from the chimney Precipitation flow measurement in water treatment Cement, cigarette, gas flow measurement in glass factory Compressed air flow measurement Natural gas, gas, liquefied gas, flare gas, hydrogen gas flow measurement Third, the technical parameters: Measuring range: ( 0.05 ~ 80 ) Nm/s (Standard state is 20 °C, 101.33KPa ) Measurement method: Segmental plug-in Temperature range: Ambient temperature: -40 °C to +60 °C           Medium temperature: -10 °C to +450 °C Accuracy: ± 1% of reading; ± 0.5% full scale Repeatability: ± 0.5% of full scale lose    Out: 4-20mA DC (large load 600 Ω); RS232 ; RS485 Response speed: less than 1S                   Supply voltage: 24VDC ± 10% Mechanical connection: 3/4NPT stainless steel fastener (insert type); flange Probe length: 800mm (This length is a plug-in standard length, special please specify) Probe diameter: 18mm (insert type)         Straight pipe length: no strict requirements Pressure loss: can be ignored Working pressure: 1.6MPa ; 7.3MPa  Live display: LED display ; LCD display Data protection : Cumulative amount stored in EEROM , (power off can save for a hundred years) Sensor and Pipe Body Material : 316L (Optional Hastelloy C ) Protection class: IP65 Explosion-proof grade: ExdIICT4 Fourth, application examples 1. Petrochemical industry Application: Torch gas emission monitoring Advantages of the product: Wide range ratio, the sensor is not easy to be blocked, and can be plugged and cleaned online. 2. Power industry Application: Air flow measurement of primary, secondary and pulverized coal in boilers Advantages of the product: easy installation, no requirement of straight pipe section, low pressure loss, no need of temperature and pressure compensation, can be used under harsh conditions (eg air contains dust, particles, serious wear, low pressure, etc.) 3. Metallurgical industry Application: Measurement of blast furnace gas and coke oven gas Product advantages: According to the actual media component calibration, component changes can be corrected, the sensor can be cleaned online, the insertion length can be adjusted 4. Electronic industry Application: High-purity gas mass flow measurement Advantages of the product: no direct measurement of mass flow with temperature and pressure compensation, the sensor head is highly polished and can be used for trade settlement 5. Heating Ventilation and Air Conditioning System ( HVAC ) Advantages of product: Sensitive product, reliable operation, no strict requirements for installation of straight pipe sections 6. Water treatment industry Application: Measuring air flow in aeration tanks Product advantages: dirt, dust, no pressure drop, easy installation on site 7. Food industry Application: Pass proper amount of gas into reactor to control process and quality Product advantages: Sanitary grade 3A , high purity, all wetted surfaces are made of stainless steel, wide range ratio
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Thermal gas mass flow meter principle