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Common faults and treatment methods
1 Failure: Flowmeter operation is unstable; Treatment method: Ensure that the pressure before the flowmeter is stable and the method of commissioning is correct.
When the flow meter is put into operation, it is stable before the flow meter. It is not possible to directly open the cylinder pressure reducing valve instead of the flow meter front valve. When replacing the cylinder or switching the flowmeter, close the front valve of the flowmeter until the pressure is stable below the operating pressure of 0.7Mpa, and slowly open the hand valve. Sudden flow surges can cause damage to the device. When changing cylinders or switching flowmeters, they are jointly completed by technicians and instrumentation personnel and mutually supervised. Never use compressed air to purge the pipeline.
2 Failure: Flowmeter blockage; Treatment method: The filter and flowmeter in front of the flowmeter need to be cleaned regularly
In order to ensure that the impurities in the medium (especially the oil and water components) are effectively filtered and the flow-restricting elements, sensors and valve cores are kept clean, the technicians need to use the time during the start-stop period to clean the filter before the flowmeter. Instrument personnel during the start and stop period, immediately after the process is stopped, access the dry nitrogen reverse-sweep flowmeter, and then switch to BF3 before driving. Note: The flowmeter must be purged after the valve has a given value and the valve is open. , prohibit the use of air pressure to open the valve when it is closed. This can cause irreparable damage to the regulator in the flowmeter. Purge time cannot be less than 30 minutes.
In order to ensure that the flowmeter passes through the medium without impurities, the flowmeter can be used normally, requiring that the flowmeter's pre-filter be replaced at least once a month, and that daily instrumentation inspections should observe the flowmeter's front pressure gauge if the pressure gauge indicates less than 4 Kg. At this time, the filter is blocked. The filter shop should be informed immediately to replace the filter.
3 Failure: The flowmeter measurement value fluctuates greatly; Processing method: It is necessary to keep the temperature inside the flowmeter box constant
Keep the temperature in the instrument box constant at a certain value (between 10-18°C) and do not have large fluctuations. Ensure that the temperature of the media into the flowmeter BF3 is stable and do not have large fluctuations. After the flowmeter is purged, close the door promptly and wait until the heater works so that the temperature in the cabinet rises above 10°C and then use the flowmeter. The instrumentation personnel will reform the heat tracing in the meter box according to the flow meter operation conditions.
Thermal Mass Flowmeter Common Faults and Treatment Methods
Thermal mass flow meters are not commonly used in traditional chemical companies, but in polyformaldehyde fine chemical companies, boron trifluoride is used as a chemical raw material because boron trifluoride is a highly toxic corrosive chemical and reacts as a trioxane. The catalyst of the process is very small in usage, and it requires accurate measurement and precise adjustment. The conventional flow meter cannot meet the measurement requirements of boron trifluoride, and thus a special flowmeter, boron trifluoride thermal mass flow meter, is used to realize measurement and adjustment. In order to achieve the requirements of process equipment production.