Audit Record Form for Negative Pressure Weighing Chamber – Accuracy and Completeness Control Plan
I. Avoiding Omission and Missing Items through Form Design (Source Control)
Require quantification in mandatory columns, prohibiting only marking a check without filling in data.
Separate columns for negative pressure and wind speed settings for independent digit entry. Do not allow only checking “normal”; any value without a number directly determines that the record is incomplete.
Fixed items for each area, no blank spaces
Basic information: Equipment number, date, shift, start and stop time, operator, reviewer all set as fixed filling columns;
Exception columns and shift handover remarks column marked as “No exceptions, please fill in ‘None’, no blank spaces allowed”.
Exception linkage filling design
Only check “exception”, then the fault description + handling measures must be filled in, binding the two columns, any missing item makes it unqualified.
Post the on-site filling standard card
Post the parameter standards (negative pressure – 15~-30Pa, wind speed 0.35~0.45m/s), filling norms, modification requirements beside the weighing chamber to facilitate real-time comparison by employees.
Uniform numbering of forms, monthly binding
Each record form has consecutive page numbers, invalidated documents cannot be torn off, all attached to the ledger to prevent missing pages and loss.
II. Unified filling norms to ensure accurate and true records
Real-time filling, strictly prohibiting pre-filling, post-recording, proxy filling
Requirements: One item checked, one item recorded; immediately fill in after completing the start-up inspection, prohibit filling in the entire day’s records at once after work; do not sign on behalf of others, the reviewer independently checks and signs.
Data filling standards
Quantitative parameters: Truthfully read the instrument value, allow minor instrument errors, deviations from the standard range must be explained in the exception column;
Qualitative inspection items: Fill in “Normal” for normal, write down specific problems for abnormal, prohibit only marking “Abnormal” without text;
Idle equipment: Unified mark “This shift not used, equipment in standby” and do not leave blank spaces.
Modification control rules
Cross out the incorrect data with a double line, write the correct value above, sign the name at the modification place; prohibit the use of correction fluid, correction stickers, or blackening to cover.
Writing tool requirements
Use a black signature pen, prohibit pencils, ballpoint pens to prevent fading and tampering.
III. Three-level review and verification mechanism, multi-level control (Core Guarantee)
1) First-level self-inspection: Operators self-check (execute immediately after filling)
① Check all columns without blanks, negative pressure and wind speed have actual measured values;
② Data and on-site pressure difference meter, wind speed instrument readings are consistent;
③ All exception items have fault descriptions and handling records;
④ Modification traces are compliant, complete signatures are present;
After self-checking without errors, submit to the team leader for review.
2) Second-level on-site review: Team leader conducts offline comparison every shift (key anti-fraud)
Must go to the equipment site to verify the record form, no paper-based verification in the office is allowed
Basic information verification: Date, shift, signatures are not missing;
Parameter on-site comparison: Read the pressure difference on-site, actual wind speed, and compare with the table values, if the error > ±3Pa, require re-measurement and filling;
Equipment status visual verification: Door gasket, gloves, fan, return air filter, alarm function actual status is consistent with the record description;
Logical loop verification: If there is a fault / parameter exceeding the standard in the record, there must be a handling measure and re-measurement result;
Judgment and disposal: Minor omissions are returned for completion immediately; data inconsistency, concealing abnormalities, proxy filling of documents are directly invalidated and reported.
3) Third-level random inspection review: QA / Equipment Administrator conducts periodic audit and verification
On-site surprise inspection: Unannounced visits to the workshop, retrieve the current record form, conduct on-site re-measurement and comparison, verify if the record is inconsistent with the site and issue deviations;
Cross-validation of ledgers
Compare the inspection record and filter replacement ledger, monthly maintenance record, maintenance work order, instrument calibration record:
Long-term negative pressure at a low level records need to correspond with filter replacement, sealing maintenance records;
Record glove damage, need to match the accessory requisition, maintenance records; Continuity check: Randomly review the records for several consecutive days to detect any traces of fraud such as batch pre-filling and complete parameter stability;
Monthly summary review: Count the frequent problems such as missed filling, data distortion, abnormal non-closure, etc., and organize on-site training for positions.
Four. Hardware guarantee to avoid inaccurate instrument readings causing record errors
Pressure differential sensors and anemometers are calibrated on schedule (monthly verification, annual external calibration), and the instruments are labeled with calibration certificates. They are prohibited from use beyond the calibration period;
Pressure differential meters and anemometer displays are installed in positions where operators can view them directly, facilitating real-time reading and reducing estimation errors;
Regularly clean the pressure guiding pipelines to prevent blockages that cause inaccurate pressure differential readings.
Five. Personnel management and assessment to reduce human errors
Special on-the-job training
New employees must be trained on form filling requirements, parameter standards, review procedures, and abnormal handling. They can operate independently only after passing the assessment; monthly record problem review training is conducted.
Performance assessment linkage
If there are multiple occurrences of missed filling, false records, or concealing abnormalities, re-training or performance deductions will be imposed; strictly prohibit re-entry, proxy filling behaviors.
Clarify job responsibilities
Operator: Bears the primary responsibility for the authenticity and completeness of the records;
Team leader: Responsible for on-duty review and on-site calibration;
QA: Responsible for supervision of random checks, deviation handling, and compliance control.
Six. Ledger archiving management to prevent record loss or damage
The record forms are collected by the team leader at the end of each day, and bound monthly by equipment number;
The storage environment is dry and protected from light to avoid blurring of the characters due to water stains or oil stains;
The records are fully retained and kept for at least one year after the product expiration date, with a clear ledger directory for easy auditing at any time;
Establish a ledger form borrowing registration system, and all issued, invalidated documents are registered, ensuring that each form can be traced.
Seven. Common defect determination criteria (any one of these is considered non-compliant)
Negative pressure and wind speed are only checked as normal, without measured values;
Parameters exceed the standard range, without abnormal explanations or handling records;
Checked as abnormal, but the fault location and phenomenon are not specified;
A large number of columns are blank, with blank sections in shift handover and remarks;
Pre-filled, proxy signatures, and centralized post-event re-entry;
Improper modification and correction, without strikethroughs or signatures of the modifier;
The recorded data does not match the actual state of the on-site instrument or equipment;
Equipment abnormalities have no closed-loop handling, only fault descriptions without re-testing;
Lack of signatures of the operator or reviewer.