When a safety auditor asks when your workplace breathalyser was last calibrated, the answer should be easy to prove. Having a device onsite is only one part of a reliable alcohol testing program. Businesses also need clear documentation showing when it was serviced, which unit was calibrated and when the next service is due. Using professional breathalyser calibration services and maintaining accurate records can help create a traceable maintenance history that supports workplace safety, equipment management and audit readiness.
Key Takeaways
- Breathalyser mouthpieces should be changed for each new person to reduce saliva contact and support cleaner testing.
- Good hygiene depends on correct handling, clean storage, and safe disposal of used mouthpieces.
- Using the right compatible mouthpiece helps protect airflow and supports a smoother testing process.
- Workplaces should keep enough replacement mouthpieces on hand to avoid delays and prevent unsafe shortcuts.
Why Calibration Records Matter During a Safety Audit
Safety audits often look beyond whether a business owns appropriate equipment. Auditors may also review how safety-related equipment is maintained, whether procedures are followed consistently and whether supporting documentation can be produced when required.
For a workplace breathalyser, calibration records can help demonstrate:
- When the device was last calibrated and when its next service is due
- Which specific breathalyser was serviced, including its model and serial number
- Whether servicing occurred within the relevant manufacturer or device calibration interval
- Whether there is a continuous maintenance history for equipment used in workplace alcohol testing
A calibration certificate should not be treated as proof that an entire alcohol testing program is compliant. Instead, it forms one part of the documentation supporting equipment maintenance, testing procedures and the broader safety management system.
Breatho’s current calibration service for its professional device includes a service certificate, reinforcing the importance of maintaining documented evidence alongside servicing.
What a Breathalyser Calibration Record Actually Shows
A good calibration record creates a clear connection between the physical breathalyser and its maintenance history. It should provide enough information for the business to identify the device, determine when it was serviced and establish whether another calibration is approaching.
Identifying the Exact Breathalyser
The most useful records identify the manufacturer, model and serial number of the breathalyser. Larger businesses may also assign an internal asset number, department or worksite to each unit.
This level of detail becomes particularly important when several identical breathalysers are in circulation. A generic invoice stating that a breathalyser was calibrated may confirm that a service occurred, but it may not clearly demonstrate which unit was serviced.
Confirming When Calibration Was Completed
The calibration date establishes an important point in the device’s service history. If questions later arise about equipment used during workplace alcohol testing, the business can review whether the device was within its appropriate maintenance cycle at that time.
A chronological service history also makes gaps easier to identify before they become a problem during an audit.
Tracking the Next Calibration Due Date
Calibration requirements can vary by device and manufacturer. Businesses should therefore record the next applicable service date for each unit rather than relying on a single company-wide interval.
Tracking due dates allows calibration to be scheduled before equipment becomes overdue and reduces the risk of discovering an expired service interval when the breathalyser is needed.
Calibration Creates an Audit Trail for Your Testing Equipment
An audit trail is simply a traceable history showing what happened to a piece of equipment over time.
For workplace breathalysers, the process should be easy to follow:
Breathalyser → serial number → calibration certificate → service date → next due date
This makes it easier for a safety manager or auditor to identify the device being used and locate the records that relate to it.
Why Traceability Matters
Traceability becomes increasingly important as alcohol testing programs grow. A business may operate several sites, rotate equipment between locations or maintain multiple breathalysers for different teams and shifts.
Without clear device identification, calibration certificates can become disconnected from the equipment they are meant to support. Recording serial numbers, assigned locations and service dates creates accountability and helps maintain a complete device lifecycle.
How Calibration Records Support Workplace Alcohol Testing
Calibration records should be viewed as part of the wider workplace testing program rather than a separate administrative task.
Alcohol screening may be carried out before shifts, randomly, following an incident or when reasonable cause exists under a workplace policy. Regardless of the trigger, the organisation should know that the equipment being used has been maintained according to the appropriate requirements.
Businesses developing broader workplace alcohol compliance procedures should consider calibration alongside device selection, employee communication, testing processes, record keeping and operator training.
Supporting Consistent Testing Procedures
A workplace can have a detailed alcohol policy, but reliable implementation also depends on properly maintained equipment. Breathalyser sensors can require recalibration over time, making scheduled servicing an important part of ongoing device management.
Keeping the relevant service documentation alongside testing procedures helps demonstrate that equipment maintenance is treated as a routine part of the program rather than something addressed only when a problem occurs.
Helping Demonstrate Equipment Was Maintained
If a historical test is later reviewed, calibration records can help establish whether the breathalyser was within its documented service period at the time.
That does not mean a calibration certificate automatically validates every individual reading. Testing technique, device operation and other procedural factors can still matter. What the record does provide is evidence that the business maintained the equipment through a documented servicing process.
Where AS 3547:2019 Fits Into Calibration Records
AS 3547:2019 relates to breath alcohol testing devices and sets recognised requirements around areas such as device performance, testing and marking. For workplaces purchasing professional breathalysers, understanding the standard can help when assessing whether equipment is appropriate for compliance-focused use.
Breatho’s AS3547 certification guide also highlights the importance of looking beyond certification alone by considering calibration requirements, product documentation and ongoing maintenance.
Businesses should follow the servicing requirements applicable to the particular device they use and keep documentation showing that this maintenance has occurred.
Certification and Calibration Are Different
Certification and calibration should not be treated as interchangeable.
Certification concerns whether a breath alcohol testing device has been assessed against the requirements of the applicable standard. Calibration is an ongoing process used to help maintain the performance of an individual device over time.
A device may therefore have appropriate certification while still requiring regular calibration. If servicing becomes overdue, the original certification does not replace the need for ongoing maintenance.
What Happens When Calibration Records Are Missing?
Missing documentation does not automatically mean every previous breath test is invalid. It does, however, make it more difficult for a business to demonstrate how its equipment was maintained.
During an audit, the business may struggle to establish when a particular unit was last serviced, whether the correct certificate belongs to that device or whether calibration was overdue during a particular period.
Incomplete records can also lead to unnecessary administrative work. Safety teams may need to search old emails, contact service providers, check purchase records or reconstruct equipment histories that should already be available.
A missing record therefore creates more than a filing problem. It creates uncertainty around equipment management and can expose gaps in the organisation’s wider testing process.
Common Calibration Recordkeeping Mistakes
Many documentation problems are preventable. Common issues include:
- Keeping calibration certificates without linking them to a device serial number
- Saving certificates across individual staff inboxes instead of a central system
- Recording the last calibration date but not the next service due date
- Allowing a device to remain in circulation after its calibration becomes overdue
- Relying only on purchase invoices instead of retaining service documentation
- Failing to record repairs, sensor replacements or other servicing
- Losing knowledge of the maintenance process when responsible employees leave
- Managing several breathalysers without a central equipment register
The aim should be to make the current calibration status of every active breathalyser easy to determine.
Create a Central Breathalyser Calibration Register
A central register is one of the simplest ways to improve breathalyser maintenance and audit readiness. It gives safety teams one location for checking device ownership, calibration status and upcoming service requirements.
What to Record for Each Breathalyser
For each active device, record:
- Make, model, serial number and internal asset number where applicable
- Assigned worksite, department or responsible person
- Date of the most recent calibration and the next due date
- Calibration certificate and relevant service provider details
- Repairs, sensor replacements or other significant maintenance
- Whether the device is active, temporarily out of service or retired
The register does not need to be complicated. What matters is that information remains current, accessible and clearly linked to the correct device.
Use Reminders Before Calibration Becomes Due
Waiting until the due date creates unnecessary risk. Calendar reminders, safety management software or asset systems can be used to flag upcoming services in advance.
The lead time should allow enough opportunity to organise servicing without leaving a site unexpectedly without suitable testing equipment.
Keep Calibration Records With Your Other Testing Documentation
Calibration certificates become more useful when they sit within the wider documentation for the workplace alcohol testing program.
The business should be able to connect its testing policy and procedures with operator responsibilities, testing records, equipment details and servicing history. This creates a clearer picture of how the overall system is managed.
For safety managers, centralised documentation also reduces the amount of time spent collecting information during audits, incident reviews or internal compliance checks.
Assign Responsibility for Breathalyser Maintenance
Calibration dates are easier to miss when responsibility is unclear. Businesses should nominate an appropriate person or team to oversee the breathalyser register and upcoming servicing.
Depending on the organisation, this may sit with a WHS manager, safety manager, compliance team, operations manager, site manager or fleet manager.
Responsibilities Should Extend Beyond Booking Calibration
Equipment ownership should include more than sending a device away for service. The responsible person should understand which breathalysers are active, confirm certificates have been stored correctly, monitor due dates and identify units requiring repair or replacement.
Making this part of routine preventative maintenance helps prevent calibration from becoming a reactive task.
Review Calibration Records Before an Audit, Not During One
The best time to discover that a calibration certificate is missing is before an auditor asks for it.
Periodic internal checks can confirm that every active breathalyser appears in the equipment register, serial numbers are correct, certificates are accessible and no units have passed their service date.
The review should also look for gaps between calibration periods and check whether equipment that was repaired, replaced or moved between sites has been properly updated in the register.
This approach turns audit readiness into an ongoing process rather than a last-minute search for documents.
Calibration Records Are Only One Part of a Strong Testing Program
Good records cannot compensate for unclear testing procedures or poorly trained operators.
Workplace alcohol testing works best when businesses combine appropriate equipment with correct operation, regular calibration, clear testing triggers and consistent processes. Policies should also address how results are handled, who is authorised to conduct testing and how employee information is protected.
Calibration records strengthen the equipment side of that system. They help demonstrate that the business has an organised process for maintaining the breathalysers on which its testing program relies.
Stay Audit-Ready With Properly Maintained Breathalysers
When an auditor asks about a workplace breathalyser, the business should be able to identify the device, locate its calibration certificate, confirm when servicing occurred and show when calibration is next due.
The principle is straightforward: calibration helps maintain the breathalyser, while calibration records help demonstrate that the maintenance occurred.
Breatho’s professional breathalyser calibration services provide servicing and documentation for supported devices, helping businesses maintain clearer equipment histories and keep workplace alcohol testing equipment ready for ongoing use.