Take corresponding measures to make the measurement accuracy of the mass flowmeter higher

Take corresponding measures to make the measurement accuracy of the mass flowmeter higher. After continuous practice and exploration, a relatively complete set of methods has been formed in the operation, monitoring, maintenance and troubleshooting of the mass flowmeter, and good results have been achieved. The effect, without further ado, let us find out together. 1. Establishment of equipment archives The establishment of archives for mass flowmeters is indispensable, which can facilitate the daily maintenance and management of mass flowmeters. Among them, the equipment file should include the installation location of the mass flowmeter, the name of the measuring medium, the working condition parameters of the medium, the diameter of the pipe, the internal setting parameters of the mass flowmeter, normal flow rate, large flow rate, etc., and each verification Certificate of conformity and daily inspection and maintenance records. 2. Realize mass flowmeter network data monitoring. The internal metering data acquisition network of the Sinopec system adopts a distributed acquisition workstation and server/client data sharing structure. Data acquisition is divided into three levels: instrument layer, data acquisition layer and data management layer. The mining network monitors the operating status of the field instruments in real time, and once an abnormality occurs, it can be found within a short time and can be analyzed and dealt with in a timely manner. 3. Zero adjustment Before the mass flowmeter is put into operation, the flowmeter should be zero-adjusted with pressure and full pipe. The steps are as follows: (1) After the flowmeter is installed, turn on the power to preheat the mass flowmeter for about 30 minutes. , can check the internal parameters of the flowmeter, check the output circuit and debug the network data acquisition and other work. (2) Pipeline operation: open the front and rear valves in turn, close the bypass valve, so that the measurement medium can circulate normally in the flowmeter, and after the flow is stable, cut off the valve behind the meter and ensure that there is no leakage. At this time, it must be Make sure that the mass flowmeter is filled with medium. (3) Observe the flow meter“live zero” Is it stable, in“live zero” The zero point adjustment can only be performed after the value of the small signal cutoff is set to zero. (4) After the zero point adjustment is completed, open the valve behind the meter and restore the normal operation of the pipeline. 4. General steps for mass flowmeter troubleshooting (1) Check whether the power supply and signal wiring are correct; (2) Check whether the process variables and internal parameter settings are correct; (3) Check the sensor coil, RTD and core processor resistance; ( 4) Check whether there is vibration or electromagnetic field interference near the installation place of the flowmeter; (5) Preliminarily judge the cause of the fault through the transmitter status indicator light, status alarm and self-diagnosis results; (6) Check and determine whether the physical state of the measurement medium has changed , such as density, viscosity, slug flow, air bubbles, impurities, etc.; (7) Open the bypass, cut off the flow meter passage, remove the flow meter, check whether the flow meter is blocked, damaged, and whether the pipeline is unblocked; (8) Put the Check the flowmeter again to see if it is normal. If the above steps still cannot eliminate the fault, contact the manufacturer. In the actual use of mass flowmeters, objective factors often affect the measurement results of mass flowmeters. We should take corresponding measures to reduce this effect and make the accuracy of mass flowmeters higher. Only by mastering the performance of the mass flowmeter, can we know how to maintain and use it.

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