How to check the calibration information of ULPA testing instruments? Certificate and validity period

ULPA filter testing instrument calibration information should correspond to the actual instrument used, measurement items and test date. The validity period of the certificate does not automatically prove that the range, method and on-site conditions are suitable for this test. A calibration certificate is placed at the back of the report and looks complete. However, the certificate itself cannot answer these questions: whether the serial number of the instrument on the certificate is the same as the instrument used in the report; whether the range covered by the certificate is in the same range as the range of the test; and whether the instrument was in normal condition on the day of the test. These questions cannot be answered by the certificate itself. Aili Industrial's own testing laboratory has systematic management records for instrument calibration. The instrument number, calibration items, range coverage and validity period are filed in the same numbering system as the test data. Test reports and instrument status can be corresponded item by item without relying on inference.

1. Check the unique identity of the instrument: the model, serial number and certificate number must match

Check the model, serial number and certificate number, and confirm that the instrument used in the report is the same as the certificate object, including relevant probe or accessory requirements.

The calibration certificate is issued for a specific instrument, not a specific model. Multiple instruments of the same model may have different calibration statuses. Aili Industry isThe HEPA/ULPA filter testing process establishes a unique number for each instrument, the calibration certificate is filed according to the instrument number, and the instrument number used is indicated in the test record;The ULPA ultra-high-efficiency filter test report and instrument records are related according to the same numbering system. During acceptance, the instrument and certificate can be checked from the report. The relationship between levels and filtering requirements can be found inISO cleanliness level comparison。

2. Verification scope and time: Within the validity period of the certificate, it also depends on whether the measurement range and method are covered

Pay attention to the calibration items, range, results and applicable periods to determine whether the test is in the specified state. Don't just look at the cover date and ignore the measurement range.

It is a necessary condition that the certificate is valid within the validity period, but it is not a sufficient condition. If the range covered by the certificate is 0-1000 Pa, and the actual test point is near 1500 Pa, the test is not covered by the certificate; if the certificate only calibrates the flow item, and the test also relies on concentration measurement, the calibration status of the concentration channel is not covered. In the instrument management of the testing laboratory, Aili Industries establishes a coverage list based on calibration items and measuring ranges. Before testing, check whether the test points are within the coverage range. The calibration status of the instruments used is noted in the testing records. For the coordination of instrument status and test conditions, please refer toHEPA FAQs and Selection Guide。

3. Record on-site functional inspection: Routine verification cannot replace calibration, but it cannot save the time.

Complete zero point, flow or other necessary checks according to procedures, distinguishing daily verification from formal calibration. Historical results after instrument anomalies should be processed according to impact assessment.

Calibration is performed periodically and a functional check is performed before each test. Zero point drift, flow deviation, or probe contamination may occur during the calibration validity period. Aili Industrial performs pre-test functional inspections on the instruments during the testing process, and the inspection results are archived with the testing records;The factory test of the FFU fan filter unit also requires pre-test confirmation of the instrument status. This set of practices can be converted into a functional checklist for on-site inspection. For data impact assessment after instrument abnormality, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

4. When the instrument serial numbers are similar and the certificate belongs to another instrument, the corresponding relationship must be corrected.

When the instrument serial numbers are similar and the certificate belongs to another instrument, the corresponding relationship should be corrected and the certificate of the same model cannot be used instead. This type of problem is prone to occur in laboratories with a large number of instruments - instruments of the same model are placed together, and if the certificate and instrument are related only by model, it is easy to be confused.

Aili Industrial Testing Laboratory uses number binding management for instruments and certificates. Instrument ledgers, calibration plans and test records are related by the same number.The testing of non-standard ULPA filter items is also recorded according to the instrument number, which can be checked item by item during acceptance. For the relationship between calibration management and data traceability, please refer toULPA ultra-high efficiency filter FAQ and selection guide。

5. Related questions and answers

If the calibration is qualified, then there is no need for daily inspections?
The on-site status still needs to be confirmed according to the procedures. Transportation, contamination and accessory connections may affect use.

Does the certificate prove that the test is valid within the validity period?
It is also necessary to check whether the measuring range and calibration items cover the test points, as well as the functional check status on the day of the test.

Can calibration certificates for instruments of the same model be used interchangeably?
cannot. The calibration certificate corresponds to the specific instrument serial number, and the calibration status of different instruments of the same model may be different.

6. Related articles

ULPA ultra-high efficiency filter FAQ and selection guide

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Non-standard customized ULPA ultra-high efficiency filter

HEPA FAQs and Selection Guide

7. Key points for selection and acceptance inspection

8. Product matching and technical support from Aili Industrial

Aili Industrial's own testing laboratory establishes unique number management for instruments. Calibration certificates are filed according to instrument numbers. Test records indicate the instrument numbers used.HEPA/ULPA filters withThe ULPA ultra-high-efficiency filter test report and instrument records are associated with the same numbering system; the instrument ledger, calibration plan and test records correspond with the same number. A coverage list is established for calibration items and measuring ranges. Before testing, check whether the test points are within the coverage range. The pre-test functional inspection results are archived with the inspection records.The factory test of the FFU fan filter unit also requires confirmation of the instrument status before testing.Non-standard ULPA filter project testing is recorded according to the instrument number. Provide process objectives, installation drawings, operating conditions and acceptance requirements, and can further communicate ULPA standard specifications, non-standard interfaces, samples and batch matching. The specific parameters and test range are based on the confirmed model and technical documents.