Installation of Thermal Gas Mass Flow Meters

Abstract: The installation information of thermal gas mass flow meter is provided by excellent flow meter and flow meter manufacturers and quotation manufacturers. Thermal gas mass flowmeter is an instrument that uses the principle of heat transfer, that is, the heat exchange relationship between the fluid in flow and the heat source (the object heated in the fluid or the heating body outside the measuring tube) to measure the flow rate. flowmeter. Thermal gas. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the installation article details of thermal gas mass flowmeters. Thermal gas mass flowmeter is an instrument that uses the principle of heat transfer, that is, the heat exchange relationship between the fluid in flow and the heat source (the object heated in the fluid or the heating body outside the measuring tube) to measure the flow rate. flowmeter. Thermal gas mass flow meters measure gas flow by measuring the cooling effect of the gas as it flows through heating elements within the flow meter. There are two thermal resistance elements in the measuring section through which the gas passes, one of which is used as a temperature detection and the other as a heater. The temperature sensing element is used to detect the gas temperature, and the heater maintains a constant temperature difference between its temperature and the temperature of the gas being measured by changing the current. When the gas flow rate increases, the cooling effect is greater, and the current that must maintain a constant temperature between the thermal resistors is also greater. Thermal air mass flowmeter The heat transfer is proportional to the gas mass flow rate, that is, the supply current has a corresponding functional relationship with the gas mass flow rate to reflect the gas flow rate. In my country, the material balance in the production process, the economic accounting in the production management and the measurement in the custody transfer process are mostly based on the mass unit. The volume of fluid is measured by differential pressure, positive displacement, velocity flow meters and methods of detecting capacity, such as manual gauges of oil tanks. With the change of working conditions, some characteristic parameters of the fluid, such as temperature, pressure, density, viscosity, etc., will change. When the working conditions change greatly, the above measurement methods often fail to accurately measure the fluid mass flow. Therefore, the development of thermal air mass flow meters is of great significance for handover metering and process control. Thermal gas mass flowmeters are the most widely used due to their high measurement accuracy, wide range ratio, wide range of applicable media, and good reliability. Thermal gas mass flowmeters are mainly used to measure liquid media, and can also be used for Measurement of medium and high pressure gas medium. At present, for the measurement of general liquid media, such as gasoline, kerosene, diesel, etc., the manual gauge or volumetric flowmeter of the oil tank is mostly used, that is, the actual liquid level of the oil tank is measured first with the oil dipstick (or instrument). , calculate its volume according to the tank table, and multiply it by the density to get the mass flow of the oil. This not only takes into account the accuracy of the instrument itself, but also the influence of parameters such as temperature and the deviation during operation. Using a mass flow meter avoids the latter bias. The following are some experiences on the installation of thermal gas mass flow meters. Installation of thermal gas mass flowmeter: 1) Thermal gas mass flowmeter works based on the principle of vibration, and in the process of its operation, electromagnetic technology is used for vibration excitation, torsion angle detection and detection signal detection. Therefore, the installation location of the thermal air mass flow meter cannot have a large vibration source, nor can it be installed near equipment that generates strong magnetic fields such as transformers and motors to prevent external interference from affecting its normal operation. 2) There is no requirement for straight pipe sections, but stress should be avoided when connecting the sensor and the pipe. If the concentricity between the sensor and the pipeline centerline is deviated during the installation of the thermal gas mass flowmeter, it will cause stress in the vibrating tube, which will form pressure, tension, or shear force to affect the alignment of the pipeline and cause detection probes. The asymmetry of the zero point changes, which affects the measurement accuracy. If the concentricity deviation between the pipeline and the sensor is too large, the zero point may not be adjusted. Therefore, reinforcement measures should be taken to stabilize the pipeline near the instrument. When installing the flow sensor, a soft connection method should be adopted as far as possible, and the flange connection screws should be tightened evenly and symmetrically. In order to reduce the influence of residual stress, the flow sensor should be zero-calibrated after installation. In order to facilitate the installation and zero adjustment of the thermal air mass flowmeter, the front and rear ends of the thermal gas mass flowmeter are also equipped with stop valves. 3) The connection cable between the sensor and the transmitter should use the special cable of the manufacturer; the transmitter receives the low-level signal, so the cable should not be too long. When installing the transmitter, make sure that the bulkhead used to separate the intrinsically safe sensor cable from the power supply and output cables is in place; make sure that the sensor junction box and the transmitter housing are well sealed to avoid short circuits that cause measurement errors or flowmeter failures. This is the whole content of this article. You are welcome to inquire about the flowmeter selection and quotation of our factory. 'Installation of Thermal Gas Mass Flow Meter'

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