How to install thermal gas mass flowmeter

Thermal gas mass flowmeters are 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 in medium , Measurement of high pressure gas medium. At present, for the measurement of general liquid media, such as gasoline, kerosene, diesel oil, etc., the manual dipstick or volumetric flowmeter of the oil tank is mostly used, that is, the actual liquid level of the oil tank must be measured with an oil dipstick (or instrument) first. , Calculate its volume according to the tank table, and then multiply it by the density to get the mass flow rate of the oil. This should not only take into account the accuracy of the instrument itself, but also the influence of parameters such as temperature and the deviation during operation. The use of mass flow meters avoids the latter bias. Let's talk about some experience in the installation of thermal gas mass flowmeters. The installation of thermal gas mass flowmeter: 1) The thermal gas mass flowmeter works based on the principle of vibration, and in the process of its work, electromagnetic technology is used to excite vibration, detect torsion angle and detect signal. Therefore, the installation position of the thermal air mass flowmeter should not have a large vibration source, nor should it be installed near transformers, motors and other equipment that generate strong magnetic fields, so as to prevent external interference from affecting its normal operation. 2) There is no requirement for a straight pipe section, but stress should be avoided when the sensor is connected to the pipe. If there is a deviation in the concentricity between the sensor and the centerline of the pipeline during the installation of the thermal gas mass flowmeter, it will cause stress on the vibrating tube, which will form pressure, tension, or shear force to affect the alignment of the pipeline, causing the detection probe to The asymmetry of the zero point will cause the zero point to change, which will affect the measurement accuracy. If the concentricity deviation between the pipe and the sensor is too large, it may not be possible to adjust the zero point. Therefore, reinforcement measures should be taken to stabilize the pipeline near the instrument. When installing the flow sensor, try to adopt a soft connection method, and the flange connection screws should be tightened evenly and symmetrically. In order to reduce the influence of residual stress, the flow sensor needs to be calibrated at zero point after installation. In order to facilitate the installation and zero adjustment of the thermal air mass flowmeter, stop valves should be installed at the front and rear ends of the thermal gas mass flowmeter. 3) The connection cable between the sensor and the transmitter should use the manufacturer's cable; the transmitter receives low-level signals, so the cable should not be too long. When installing the transmitter, make sure that the partition used to separate the intrinsically safe sensor cable from the power supply and output cables is installed in place; make sure that the sensor junction box and the transmitter housing are sealed well to avoid short circuits that cause measurement errors or flowmeter failures

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