I. Standardize data collection and ensure accuracy from the source
The detection instruments must be calibrated regularly
Pressure differential meters, particle counters, temperature and humidity meters, etc. should be within the valid calibration period. The calibration certificate number should be recorded in the ledger to avoid errors in data caused by instrument inaccuracies.
Unify data reading standards
Ensure that the line of sight for pressure differential readings is perpendicular to the dial and be precise to two decimal places; for example, measure the temperature and air volume of the fan using a unified method to prevent human reading errors.
Double-check critical data by two people
For important data such as the final resistance of the high-efficiency filter and cleanliness testing, two people should read and confirm separately. If there is inconsistency, immediately re-measure.
II. Implement on-site immediate recording to eliminate memory errors
Adhere to recording while operating, fill in immediately after measuring the pressure differential and completing the cleaning. Prohibit recalling and supplementing after the fact.
Avoid vague descriptions. All states should be quantified and filled in, for example, write “Pressure differential 280Pa, approaching the initial value by 1.5 times”, rather than simply writing “Normal”.
III. Standardize record filling to avoid human errors
Erroneous writing can only be crossed out with a single horizontal line, and the correct content should be rewritten and signed by the person making the correction and the date. Prohibit the use of correction fluid or scraping.
Set a traceability function for electronic records, allowing all editing traces to be traced back. Prohibit deleting or overwriting the original data.
The signature of maintenance personnel must be signed by the person themselves, and prevent proxy signing.
IV. Strengthen logical verification to prevent data contradictions
Check the trend of pressure differential changes. Normally, it should gradually increase with the use time. Abnormal fluctuations need to be verified and noted.
Ensure a closed-loop process: when the pressure differential exceeds the limit → replace the filter → record the initial pressure differential of the new filter, and the data before and after must match.
The maintenance content and results should be corresponding. For example, when disassembling and cleaning the diffuser plate, it is necessary to simultaneously record the post-cleaning status.
V. Establish a multi-level review mechanism to correct errors promptly
First-level self-check: After the operator completes the recording, they should self-check.
Second-level review: The team leader should randomly check the completeness and data rationality of the records daily.
Third-level audit: The quality department should regularly check the maintenance records and the actual equipment status on site.
VI. Strengthen personnel training to enhance professional accuracy
Train maintenance personnel to be familiar with the structure of the supply air ceiling, filter parameters, and standard resistance range.
Clarify filling norms, emphasize key error-prone items, and reduce the error rate of filling.
VII. Fix standardized templates to reduce filling omissions
The template clearly specifies mandatory items, including equipment location, time, various data, maintenance content, abnormal handling, verification results, and signatures, to avoid missing key information.