Mass flow meter installation considerations
Mass flow meter is an instrument that accurately measures gas flow. The measured value is not misaligned due to temperature or pressure fluctuations. It does not require temperature and pressure compensation. The mass flow meter directly measures the mass flow of the medium through the flow meter. Measuring the density of the medium and indirectly measuring the temperature of the medium. Since the transmitter is a smart meter with a single-chip microcomputer as its core, more than ten parameters can be derived for the user according to the above three basic quantities.
Mass flow meter installation considerations
1. The mass flowmeter works based on the principle of vibration. In the course of its work, it also uses electromagnetic technology for vibration excitation, twist angle detection and detection signal processing. Therefore, the mass flowmeter can not be installed in a large position. The vibration source cannot be installed near equipment that generates strong magnetic fields such as transformers or motors to prevent outside interference from affecting its normal operation.
2, the installation of mass flow meter without straight pipe requirements, but the sensor and the pipe connection should avoid stress, if the mass flow meter installation process, the sensor and the pipe centerline concentricity deviation, will cause the vibration tube to produce stress, Stress can cause stress, tension, or shear forces to affect the alignment of the pipe, causing asymmetry in the probe, resulting in zero-point changes, affecting the measurement accuracy [3, 4]. If the concentricity deviation between the pipe 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 the flow sensor is installed, the soft connection method should be adopted as much as possible. The flange connection screws should be evenly and symmetrically fastened. To reduce the influence of residual stress, the flow sensor must be installed after it is installed. Zero calibration is performed. In order to facilitate the installation and zero adjustment of the mass flowmeter, stop valves are also installed at the front and rear ends of the mass flowmeter.
3, sensor and transmitter connection cable should use the manufacturer's special cable; transmitter receives a low-level signal, so the cable should not be too long. When installing the transmitter, make sure that the partition plate that separates the intrinsically safe sensor cable from the power supply and output cables is in place; make sure that the sensor junction box and transmitter housing are sealed to prevent short circuits that may cause measurement errors or meter failures.
4, according to the different nature of fluid selection of different sensor installation orientation, to always maintain the sensor flow tube in the fluid filled state, the gas feed measurement of the mass flow meter U-shaped tube upward, so as not to accumulate in the measurement tube condensate; liquid feed measurement Mass flow meter U-shaped tube down, so as not to measure the accumulation of gas inside the tube.
Mass flow meter installation considerations
1. The mass flowmeter works based on the principle of vibration. In the course of its work, it also uses electromagnetic technology for vibration excitation, twist angle detection and detection signal processing. Therefore, the mass flowmeter can not be installed in a large position. The vibration source cannot be installed near equipment that generates strong magnetic fields such as transformers or motors to prevent outside interference from affecting its normal operation.
2, the installation of mass flow meter without straight pipe requirements, but the sensor and the pipe connection should avoid stress, if the mass flow meter installation process, the sensor and the pipe centerline concentricity deviation, will cause the vibration tube to produce stress, Stress can cause stress, tension, or shear forces to affect the alignment of the pipe, causing asymmetry in the probe, resulting in zero-point changes, affecting the measurement accuracy [3, 4]. If the concentricity deviation between the pipe 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 the flow sensor is installed, the soft connection method should be adopted as much as possible. The flange connection screws should be evenly and symmetrically fastened. To reduce the influence of residual stress, the flow sensor must be installed after it is installed. Zero calibration is performed. In order to facilitate the installation and zero adjustment of the mass flowmeter, stop valves are also installed at the front and rear ends of the mass flowmeter.
3, sensor and transmitter connection cable should use the manufacturer's special cable; transmitter receives a low-level signal, so the cable should not be too long. When installing the transmitter, make sure that the partition plate that separates the intrinsically safe sensor cable from the power supply and output cables is in place; make sure that the sensor junction box and transmitter housing are sealed to prevent short circuits that may cause measurement errors or meter failures.
4, according to the different nature of fluid selection of different sensor installation orientation, to always maintain the sensor flow tube in the fluid filled state, the gas feed measurement of the mass flow meter U-shaped tube upward, so as not to accumulate in the measurement tube condensate; liquid feed measurement Mass flow meter U-shaped tube down, so as not to measure the accumulation of gas inside the tube.
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