16 Key Points for the Use and Maintenance of Instruments

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1. It is prohibited to use signal cables and power cables together in a multi-core cable! 2. When disconnecting wires from instruments for maintenance, it is essential to wrap the wire ends tightly to prevent short circuits that could lead to accidents! 3. The connection cable should not have any intermediate connectors. 4. Point shielding grounding is generally carried out on the control room side. 5. The protective hose must be positioned below the instrument inlet to prevent water from entering the instruments. 6. The open-air instruments should be equipped with instrument protection boxes or wrapped in nylon plastic bags. 7. When cables are laid in cable trays, intrinsically safe cables, power cables, and signal cables should be separated using partitions. 8. When performing wiring operations, compensation wires should not use terminal lugs to prevent contact between two different conductors, which could lead to errors in the measurement results. 9. The control room must have proper protection measures in place to prevent damage caused by small animals. 10. Single-unit testing must be completed before the instruments are installed, and circuit testing must be finished after installation before integrated testing can be carried out. 11. For on-site maintenance of instruments, it is necessary to contact the technical personnel to understand the status of the process. When removing instruments that are connected to power, the power supply must be turned off first; then use a multimeter to confirm that the power is indeed off, ensuring safety first. 12. When designing flow meters, it is essential to select the appropriate type of meter based on the medium being measured, as well as temperature and pressure conditions, and to implement proper flow compensation. Attention should be paid to the various special requirements of flow meters during installation. 13. When routing instrument wiring into the trunking in the control room, in order to prevent rainwater from entering the control room, upward and downward bends must be considered, and proper sealing measures must be taken. 14. When instrument air is introduced from the main pipe, the valve must be located above the exact center of the pipeline, preferably at a 90-degree angle above it, to prevent debris in the air stream from entering the instrument valve. 15. The shielding layer shall not be grounded at both ends ； The outlets of outdoor cable protection pipes should have rainproof measures ； In explosion-proof environments, pay attention to the sealing of pipe openings. 16. Do not disassemble equipment while it is powered on; carry a voltage tester with you to avoid the risk of electric shock. Xi’an Dinghua Electronics Co., Ltd., established in 1992 and currently located in Xi’an, Shaanxi Province, is a high-tech enterprise that specializes in the research, development, production, sales, and engineering services of external liquid level measuring instruments, radar level gauges, and other related products. At present, the company offers a range of products including radar level gauges, external measurement level instruments, fork-type level switches, electro-hydraulic actuators, ultrasonic flow meters, and external temperature sensors. All of these products have withstood numerous complex operational conditions in real-world settings, and they are widely used in industries such as petroleum, chemicals, power generation, coal mining, metallurgy, as well as food and pharmaceuticals. Professional selection guidance, excellent product quality, reasonable prices, fast delivery times, and comprehensive pre-sales, in-sales, and after-sales services…