Safety managers and equipment administrators who run breathalyzers may find a calibration label torn or detached during a routine check, while moving equipment, or while preparing to submit certificates. A calibration label is a mark attached to the equipment that helps identify calibration-related information quickly. However, the fact that the label is damaged does not by itself mean the equipment was never calibrated or that something is wrong with its measurement condition.
What you need to check here is not how the sticker looks, but whether the one breathalyzer you have and the one calibration document refer to the same item. Calibration is the work of establishing the relationship between a reference value and the value the equipment indicates. It is distinct from adjusting the equipment, repairing a fault, or judging whether it meets a particular standard. By cross-checking the serial number on the unit, the calibration certificate, and the calibration intake record in turn, you can separate what has been confirmed from what still needs checking, even after the label is damaged.
Preserve the damaged label as it is
Even if the label is lifting or only partly left, it is better not to peel it off right away or add glue. The remaining date, document number, institution name, and position can be clues to cross-check against the certificate or intake record. Photographing the readable parts and the position records the condition at the time of damage, but the photo itself is not evidence of the calibration result.
Next, check the model name and serial number on the unit itself. The asset number assigned by your organization and the serial number assigned at manufacture may differ, so compare the same item as the identification stated on the certificate. It is best not to open the unit, or wipe or disassemble the area around the sensor, to look under the label.
Cross-check equipment numbers and documents one by one
The fact that a certificate is on file does not confirm the status of the equipment in front of you. You need to see whether the equipment number of the calibrated item stated on the certificate matches the serial number of the unit you have. The scheduled calibration date in an internal management list may be a future plan, so do not read it as evidence that calibration was actually completed.
| Record to cross-check | What to check | When the record is missing or does not match |
|---|---|---|
| Unit and remaining label | Model name, serial number, remaining markings | Photograph the readable content and avoid damaging the label further. |
| Calibration certificate | Equipment number of the calibrated item and calibration date | Separate documents by unit to make sure another unit's document has not been mixed in. |
| Calibration intake record | Identification of the equipment received and the issuing body | Organize the information needed to ask the issuing body to re-confirm. |
| Internal management list | Equipment location, what was recorded as completed, scheduled date | Look for documents other than the scheduled date that support completion. |
When checking several units together, handling one unit and one certificate as a single set reduces confusion. Even within the same model, a different serial number means a different unit. If you copy the label date or certificate details of a neighboring unit onto the unit with the missing label, it becomes even harder to determine the actual calibration history later.
Classify the current status based on whether the records match
As a hypothetical example, consider a case where most of the label on unit A came off from rubbing against its case during transport. The person in charge photographs the remaining markings and position, checks the serial number on unit A, and cross-checks it against the item number on the certificate on file. If the two numbers match, the observed fact is that "the label is damaged, but the identification on the unit and the certificate match."
Based on this interpretation, a possible action is to record the damage, the date checked, and the certificate cross-checked in the internal management list, and to ask the issuing body whether the label can be reissued. The completion criterion in this case is not attaching a new sticker. It is confirming that the serial number of the current unit is linked to the corresponding certificate or issuance record.
Conversely, if the certificate's number differs from unit A or the certificate cannot be found, you cannot immediately conclude that there is no calibration history. It is accurate to classify it as a state in which the records currently available do not link the unit to a calibration document. To keep others from mistaking it for a unit whose check is complete, you can store it separately or write the actual progress in the management list, such as "document cross-check in progress," and confirm with the issuing body based on the intake record.
Link reissued labels to the issuing body's records
Even when the equipment number and certificate match, it is advisable to follow the issuing body's guidance on how to re-label the equipment. Sending the institution name, the unit's serial number, the document information on the certificate, and the condition of the damage helps the body check its records and decide whether a label can be reissued.
Manufacturer materials can be used to understand how to identify the equipment and the scope of handling. However, the existence of a product manual does not prove the recent calibration history of a specific unit. Likewise, you cannot apply a product photo or the label from another unit of the same model to the current unit.
Avoid making and attaching your own labels that combine an accredited body's mark, a certificate number, and a calibration date. If the originally issued label and internally made markings get mixed, it later becomes hard to tell which information is the issuing body's record. If the equipment was adjusted or repaired during the checking process, that work does not mean the same as calibration, so it is better to keep the related documents separate too.
Internal markings should only show the progress of the check
If you need to show on site how the check of a unit is progressing, you can use markings for internal management. For example, write only the actions actually taken, such as "certificate number cross-check complete" or "checking with issuing body." It must be clear that this is not a substitute for a calibration label but a marking for telling equipment apart and continuing the check.
Internal markings are best placed where they do not cover parts needed to identify and use the equipment, such as the serial number, screen, controls, and inlet. Once the link between the unit and the document is confirmed, record the damage and the documents used for the cross-check in the management list. Only by not writing up unconfirmed content as if it were past history can later staff distinguish the confirmed scope from the unconfirmed scope.
Look at storage and transport when damage keeps recurring
If labels keep getting damaged, you can record the conditions actually observed, such as friction when putting units into and taking them out of the case, how they are stacked with other items, and where they make contact during transport. Noting which unit's label, in which position, was damaged and in what way gives you clues for judging whether storage methods need adjusting.
There is no need to hastily pin down the cause or add treatments such as improvised coating, heat treatment, or extra glue. When a label peels off, the key is not to make the mark look new but to confirm the link between one unit and one document. Proceed in order: cross-check the serial number on the unit against the item number on the certificate, and if records are lacking, confirm the issuing body's records through the intake record.
