1. The pointer stuck
(1) Metal float flow meter glass panel damaged squeeze pointer stuck. Approach is: open the display table replacement glass panel;
(2) Vibration, in other equipment overhaul or instrument overhaul instrument pointer deformation loosening, the pointer deformation can not reflect the actual flow value. Approach is: Use the same model to replace the installation of display adjustment table.
2. pointer jitter
(1) metal float flow meter pointer because the pipeline and medium fluctuations will produce slight fluctuations.
(2) Pipelines and media fluctuate slightly due to unstable operating pressure;
The above fault can contact the control room to find out the reasons for the operation, adjust the process parameters to stabilize the pressure and temperature flow, increase the metal float flow meter damping, improve the process environment to make the flowmeter stable.
Signal power failure
(1) signal amplification conversion component damage fault;
(2) screw loose transmission line failure;
(3) DCS control station terminal failure;
(4) control station I / 0 module failure.
Troubleshooting method is: "split method" in the control room terminal board after the control station voltage DC (1-5) V, analysis to determine whether the site fault or control room failure, the failure rate is the highest terminal screws loose, fastening screw failure Can be ruled out. Fault can not be ruled out According to the terminal wire number to find DCS measurement module fault, find the module fault indicator light to see if there is a fault, can also be used "replacement method" to replace the same model measurement module replacement to see if the display is normal.
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