Breathalyser Calibration: Why It Matters and How Often You Should Do It

You’ve bought quality breathalysers, written a solid alcohol policy and trained your security team. Then, months later, a disputed result reveals the device hasn’t been calibrated since it came out of the box. It happens more often than you’d think, and it can undo a well-built testing programme.

What calibration actually does

Over time, the sensor in a breath alcohol tester drifts. Calibration checks the device against a known reference and adjusts it so it reads correctly again. Without it, even a top-end instrument can start giving skewed readings, and that affects both safety and fairness.

Three reasons calibration can’t be skipped

1. Accuracy

Correct calibration means correct BAC readings. That lowers the risk of false positives, where a sober employee gets sent home, and false negatives, where an impaired one gets onto site.

2. Compliance

Alcolizer breath testers are certified to the Australian Standard AS3547, which covers the accuracy and reliability of breath alcohol testing devices. Calibrating regularly keeps your devices within that standard, which matters if a result is ever challenged at a disciplinary hearing or the CCMA. A correct paper trail and traceable calibration and/or service records is vital to the presenation of evidence.

3. Longevity

A device that’s maintained properly lasts longer. Regular calibration keeps it running well, which means less downtime and lower long-term maintenance costs.

Understanding the AS3547 standards

There are two versions of the standard you’ll come across:

• AS3547:1997: the original standard, which laid the groundwork for accuracy in breath alcohol testing. The Alcolizer HH3 sold by RunRite is certified under this standard.
• AS3547:2019: the updated standard, with stricter reliability and performance requirements. The Alcolizer HH4, Alcolizer LE5 and Centurion Quantum meet this standard.

If you’re buying new equipment or replacing older units, it’s worth knowing which standard your devices are certified to. In South Africa rhe reliance on international best practices is important to note when selecting a testing device.

What good calibration looks like

Not all calibration services are the same. Look for these:

• OEM-certified technicians: RunRite, the master distributor for Alcolizer Technology in Africa, uses technicians certified by the original manufacturer.
• Manufacturer procedures and genuine parts: calibration should follow the OEM’s recommended guidelines.
• Traceable Calibration Reference standards should be used.
• Thorough testing: the device should be checked against AS3547 requirements, not just given a quick adjustment.
• ISO 9001 certification for peace of mind that the procedures are audited.
• Fast turnaround: every day a device is away is a day your site may not be testing.

Avoiding downtime

For some Alcolizer models, RunRite offers a module exchange, where you swap the sensor module for a freshly calibrated one instead of sending the whole unit away.

How often should you calibrate?

The right interval depends on the device and how heavily it’s used. Follow the manufacturer’s recommendation for your model. Sites doing heavy volumes, such as gate testing at shift change, may need more frequent checks.

Tip: keep a calibration register for every device, with its serial number, last calibration date and next due date. If a result is ever disputed, that record is your first line of defence.

Don’t forget the basics

Calibration is one part of reliable testing. Using a fresh mouthpiece for every test, such as Alcolizer standard mouthpieces, helps keep results hygienic and consistent.