What items should be checked during the inspection of on-site instruments?

During inspections, it is necessary to check whether the instrument readings are normal, whether there are any leaks at the connections on site, and whether the wiring and grounding terminals are in good condition. For transmitters, regular cleaning and zeroing procedures must also be carried out...

Additional points regarding the second floor: it is necessary to check whether the instrument readings are normal, whether there are any leaks at the connections on site, and whether the wiring and grounding terminals are in good condition. It is also important to identify any potential factors that could affect the accuracy of the instruments (such as whether proper insulation measures have been taken to protect against temperature changes, or whether ultrasonic or radar measurements show excessive steam levels in the tank). Outdoor instruments should be protected from rain and sunlight, their surfaces should be cleaned regularly, and communication with the process operators must remain smooth

During inspections, ask the operators about the operation status of the instruments； Display the DCS status screen to check the operation status of the cards ； Check whether the room temperature and humidity are within the required range ； Check the condition of the instruments on site ； Check for instrument leaks ； Check whether the instrument is waterproof, heat-resistant, and frost-proof ； Check the gauge components and the tightness of the connections ； Conduct an alarm test ； Lubricate the instrument components ； Perform instrument drainage, condensate removal, and gas release ； Perform instrument cleaning and maintenance.

A proper inspection route should be established, with special attention paid to important valves and gauges. The purpose of routine inspections is to identify potential risks, such as leaks at the packing areas, issues related to insulation and heating, leaks in the duct clamps, and whether the fixing supports for pneumatic components are secure. It is also necessary to clean the pressure gauges regularly. In summer, measures must be taken to prevent rain (sealing of wiring terminals, gauge heads, and wiring boxes), to keep insects at bay (using insect screens on two-way five-port exhausts and on the exhaust ports of single-acting cylinders), and to ensure proper lightning protection (through proper grounding). In winter, anti-freezing measures are required; heat generation stations need to have their condensate drained regularly, and the temperature of pressure gauges should be checked daily so that any issues can be addressed promptly. Lubricant should be applied regularly to the control valves in high-temperature areas, and the analysis instruments should be maintained and calibrated periodically; that’s roughly it. {:3_47:}