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(1) Phenomenon: When there is no flow in the pipeline, the flow rate display is not 0.
Solution: 1. Check if the grounding is good. 2. Check if the gain is too high. 3. Check whether the pipeline vibration is serious. If necessary, support the pipeline perpendicular to the axis of the pipeline and the vortex generator body near the flowmeter.
(2) Phenomenon: There is flow in the pipeline, but it is displayed as 0.
Solution: 1. First confirm whether the flow value is below the lower limit or near the lower limit. 2. Check if the flow sensor / temperature sensor / pressure sensor connection is good. 3. Increase the gain and observe. 4. Observe whether the temperature and pressure are normal. Detect the flow/temperature/pressure sensor circuit check by sensor detection method.
(3) Phenomenon: The flow display is unstable.
Solution: 1. First confirm whether the flow itself is unstable, and increase the time constant appropriately. 2. Check if the flow is near the lower limit. 3. Check if the pipe vibration is serious and support if necessary.
(4) Phenomenon: The current output is not correct.
Solution: 1. First confirm that the secondary meter range is consistent with the maximum flow rate, and determine whether the current output is normal or not. 2. Detect the current output loop (enter the engineer menu). 3. Check if the current loop load resistance is less than the maximum load resistance value of 600 ohms.
(V) Phenomenon: The flow rate changes with the flow, but does not match the actual flow.
Solution:
1. Check whether the instrument number and the bit number are correct. Note that the instruments of different machine numbers cannot be misplaced.
2. Check if the meter constant meter value is consistent with the nameplate.
3. When the measurement mode is mass flow rate and standard volume flow rate, check whether the temperature and pressure of the working condition of the medium are too different from the design selection. If the difference is very large, the corresponding parameters must be calculated according to the actual working conditions. Condition density, standard density, maximum flow, minimum flow, etc.).
4. Check whether the straight pipe sections before and after meet the requirements.
5. Check if the instrument installation is centered.
6. Check that the inner diameter of the pipe is consistent with the inner diameter of the meter.
7. Check the gasket and do not penetrate into the pipe.
8. Check if the inner wall of the pipe is smooth.
9. Check if the installation angle and direction are correct, and whether the media flow direction is consistent with the arrow.
10. Check whether the measurement medium has a two-phase flow. For example, add a moisture separator to the wet steam to remove the small water droplets, and use a suitable filter to remove the solid particles in the gas.
11. Check whether the flow rate is near the lower limit. The flow rate below the lower limit cannot accurately and stably measure.
12. Check the sensor to see if the capacitance and insulation resistance are within the specified range.
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