Instrumentation workers in the daily maintenance of automatic control instruments and process detection instruments generally have their own responsibility for the area of ​​instrument maintenance responsibility, according to the distribution of the instrument under the jurisdiction of the jurisdiction, the best selection of inspection routes, at least once a day inspection. During the inspection tour, the instrumentation engineer should understand the operation of the instrument to the on-duty technicians.
1 Check whether the meter indication and recording are normal, whether the meter (transmitter) indication on the site and the control room display meter and the adjustment meter indication value are the same, whether the regulator output indication and the valve position of the regulator valve are the same (usually two meter operators are required at the same time) Observe that if the production process changes little, it is normal that there is a time difference between the production site and the control room.
2 Check the instrument power supply (if the electric type III instrument uses a 24V DC power supply, check whether the power supply voltage is within the specified range), and whether the air source (0.14MPa) has reached the rated value.
3 Check the instrument insulation and heat tracing conditions.
4 Inspect the instrument body and connectors for damage and corrosion.
5 Check for leaks at the meter and process interface.
6 Check the condition of the meter. Instrument integrity can be checked with reference to the “Equipment Maintenance and Inspection Regulations†issued by the Ministry of Chemical Industry. Examples are as follows. According to HG 25359-91 "Vortex Flowmeter Maintenance and Inspection Regulations", the vortex flowmeter (vortex flowmeter) is in good condition as follows.
(1) Parts are complete and meet the technical requirements, namely:
a. The nameplate should be clear and correct;
b. Parts should be complete and standardized;
c. fasteners must not loosen;
d. The connectors should be in good contact;
e. The terminal wiring should be secure;
f. Adjustable parts should be in an adjustable position;
g. The seal should be leak free.
(2) Operation is normal and meets the requirements for use, ie:
a. When operating, the instrument should meet the specified performance indicators;
b. Under normal conditions, the instrument indicates that the value should be 20% to 80% of the full scale;
c. Accumulated mechanical counters should be flexible and free of jamming.
(3) The equipment and environment are neat and clean and meet the requirements of the work, namely:
a. The whole machine should be clean and free of rust. The lacquer layer should be smooth, bright and free from shedding;
b. The instrument pipelines and lines shall be laid neatly and all shall be fixed and installed;
c. There should be a permanent sign indicating fluid flow in the obvious part of the instrument housing;
d. The piping and circuit markings should be complete, clear and accurate.
(4) The technical data is complete and accurate and meets the management requirements, namely:
a. The specification, certificate, and verification certificate of the factory shall be complete;
b. Operation records, troubleshooting records, calibration records, and parts replacement records should be clear and correct;
c. The system schematic and wiring diagram should be complete and accurate;
d. The meter constant and its change record should be complete and accurate;
e. The explosion-proof instrument manufacturer must have an explosion-proof certificate issued by the explosion-proof appraisal agency;
f. There should be a complete set-up (or programming) of the accumulator to record the daily maintenance of the automation control instrumentation and process instrumentation.
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