Meters on the daily inspection of the instrument - Database & Sql Blog Articles

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Instrumentation technicians typically have their own dedicated area for maintaining and repairing instruments. Based on the layout of the instruments under their responsibility, they plan the most efficient inspection route and conduct checks at least once daily. During these inspections, it's important for the instrumentation staff to communicate with the on-duty process operators to ensure a clear understanding of the instrument’s operation.

1. Check the instrument readings and ensure they are normal. The on-site transmitter should match the display in the control room, and the regulator output should correspond with the valve position (usually two technicians are required for this). If there is minimal change in the production process, a slight time lag between the field and control room readings is acceptable.

2. Verify that the power supply (for electric III-type instruments, check if the 24V DC power is within the specified range) and the air source (0.14MPa) meet the required levels.

3. Inspect the insulation and heating tracing conditions of the instruments to prevent damage from temperature fluctuations or moisture.

4. Examine the instrument body and connectors for any signs of damage or corrosion, which could affect performance or safety.

5. Check for leaks in the instrument and its connection points with the process system to avoid contamination or operational issues.

6. Ensure the instrument is in good working condition. You can refer to the "Equipment Maintenance and Repair Procedures" issued by the Ministry of Chemical Industry as a guide. For example:

According to HG 25359-91 "Regulations for Maintenance and Care of Vortex Flowmeters," a vortex flowmeter is considered to be in good condition if the following criteria are met:

1. All parts are complete and meet technical requirements:

• The nameplate must be clearly marked and accurate.
• All components should be present and standardized.
• Fasteners must not be loose.
• Connectors should maintain good contact.
• Terminal wiring must be secure.
• Adjustable parts should be in the correct position.
• Seals should be leak-free.

2. The instrument operates normally and meets usage standards:

• The meter must perform according to its specified indicators during operation.
• Under normal conditions, the reading should fall between 20% and 80% of the full scale.
• The mechanical counter for accumulation should move smoothly without sticking.

3. The equipment and surrounding environment are clean and well-maintained:

• The entire unit should be clean, free of rust, and have a smooth, bright paint finish.
• Instrument pipelines and cables should be neatly arranged and securely fixed.
• A permanent label indicating the fluid flow direction should be visible on the instrument casing.
• Pipeline and cable markings must be complete, clear, and accurate.

4. Technical documentation is complete and accurate:

• All specifications, certificates, and factory compliance documents should be available.
• Operation logs, fault records, calibration data, and replacement records must be accurate and up-to-date.
• Schematic diagrams and wiring plans should be complete and precise.
• Instrument constants and their changes should be properly documented.
• Explosion-proof instruments must have an official explosion-proof certificate.
• All configuration or programming data for the accumulator should be fully recorded.