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

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

GW MB10F 0.8A 1000V rectifier bridge

Supply 1206 blue light 1206 blue LED quality assurance original authentic large number

Instrumentation technicians usually have their own dedicated area for maintaining and repairing instruments. Based on the distribution of instruments in their assigned areas, they determine the most efficient patrol inspection route and conduct checks at least once daily. During these inspections, instrumentation staff should communicate with the on-duty process operators to ensure a clear understanding of the instrument’s operation.

1. Check the instrument's readings and ensure they are normal. The on-site transmitter display should match the control room instrument reading, and the regulator output should correspond with the valve position (typically two technicians are required for this task). If the process changes slightly, a small time lag between the field and control room is acceptable.

2. Verify that the instrument’s power supply is within the specified range—especially for electric III type instruments using 24V DC. Also check if the air source pressure reaches the rated value of 0.14MPa.

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

4. Examine the instrument body and connectors for any signs of damage or corrosion that might affect performance.

5. Check for leaks at the instrument and process interfaces to ensure safe and accurate operation.

6. Confirm the instrument is in good working condition by referring to the "Equipment Maintenance and Repair Procedures" issued by the Ministry of Chemical Industry. For example, according to HG 25359-91 "Vortex Flowmeter Maintenance and Maintenance Regulations," a vortex flowmeter is considered in good condition if:

1. All parts are complete and meet technical requirements, including:

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

2. The instrument operates normally and meets usage requirements, such as:

• Performance indicators meet specifications during operation.
• Under normal conditions, the instrument reading should be between 20% and 80% of the full scale.
• The mechanical counter for accumulation should move smoothly without sticking.

3. The equipment and surroundings are clean and organized, meeting work standards, including:

• The entire unit is clean, free from rust, and has a smooth, bright paint finish.
• Instrument pipelines and wiring are neatly arranged and securely fixed.
• A permanent label indicating fluid flow is visible on the instrument casing.
• Pipeline and wiring labels are complete, clear, and accurate.

4. Technical documentation is complete and accurate, meeting management requirements, such as:

• Specifications, certificates of conformity, and factory entry documents are all available.
• Operation records, fault handling logs, calibration reports, and part replacement records are clear and accurate.
• System schematics and wiring diagrams are complete and precise.
• Instrument constants and their change records are well-documented.
• Explosion-proof instruments must have an explosion-proof certificate from an authorized agency.
• Complete programming or configuration data records should be available.