(2) The instrument is too high in zero position
Example 7-30 A certain device does not flow during the production process, and the instrument is still showing.
① Fault check: At the beginning, it was suspected that there was a problem with the setting of small signal cutting. The parameters that change the D10 (LOW CUT) LOW flow cut value have no effect, and the meter still shows a slight flow value change. E10 parameter settings are incorrect
② Troubleshooting: Change E10 from 7 to 8, display screen is restored
③ Repair summary: This is a Shanghai Henghe Diameter 250mm DY Vortex flowmeter. This failure is caused by the wrong caliber setting. Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size: Nominal size If the smart instrument fails, the setting parameters need to be checked.
Example 7-31 A Rosemount 8800D vortex flowmeter, there is still 4.5mA current output without flow.
① Fault check: Contact with the process to determine whether there is flow, which is normal use of the instrument. I decided to make a slight adjustment of
② Fault handling: Adjust low-pass filter to make the output current 4m
③ Repair summary: According to the instructions: "Operation errors are still detected when zero flow, which can be eliminated by adjusting small flow cutoff, trigger level or low-pass filter ". The small flow of this table has been cut to the specified value and cannot be adjusted any more. The manufacturer does not recommend that users adjust the water level by themselves. Only the low-pass filter (manual shortcut keys: 1, 4, 3, 2.4) is adjusted, and
is still valid
