【Daily Question 20090410】Please provide examples of how problems with other types of specialized equipment can affect instrumentation devices
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Please share examples of situations where problems with other types of specialized equipment affect instrumentation devices, and how such issues should be handled Let me talk about one issue first: all the temperature readings from the thermocouples on the baking oven are not displayed. The fault occurs in a regular pattern, once every hour for a duration of 1 minute. In sync with the DCS vibration output, the vibration was activated; when it reached the 4th group, a fault occurred. A professional electrician was called in to conduct an inspection, and it was found that this cable was connected to 220AC power, which caused a change in the power supply of the sensor module, resulting in cross-talk. The electrician fixed the problem by replacing the cable. According to regulations, the electrical cables for instruments should not use the same cable tray, but in practice this is not the case; in (older enterprises), it is done for the convenience of the construction drawings. If electrical cables are fed into the electrical tray, such problems can be largely avoided. This post was last edited by wopale3 on 2009-4-10 22:10]
During the trial operation, a sudden failure of the UPS caused the entire automation system to stop, affecting the process trial run. It is necessary to re-establish the system after a UPS failure and reset all emergency shut-off valves.
The desiccant in the dryer of the air compressor is aluminum oxide particles; over time, a significant amount of powder accumulates and enters the compressed air pipelines, blocking the nozzles in the valve positioners used for supplying air to the instruments, which leads to various valve malfunction issues.
1. On rainy days, water gets into the protective casing of our thermocouples, resulting in inaccurate temperature readings. 2. There is a problem with the grounding wire, and the mass flow meter was struck by lightning.