Breathalyser FAQs

Fuel cell sensors use platinum electrodes to measure alcohol with high accuracy. Ethyl alcohol is oxidised into acetic acid, generating a current that determines your reading. Semiconductor sensors also measure alcohol but are less precise, as other substances can mimic alcohol, leading to skewed results. Fuel cell sensors are preferred by law enforcement for their precision and longer calibration intervals.

Mouthwash contains ethanol, a type of alcohol, which can trigger a reading. Wait 10–15 minutes after using mouthwash, eating, or drinking anything (including non-alcoholic beverages) for accurate results.

Wait at least 20 minutes. Alcohol takes time to absorb into the bloodstream and expel through breath. Testing too soon may lead to inaccurate readings or unnecessary sensor saturation.

Avoid driving with any alcohol in your system. BAC levels can rise for up to two hours after your last drink as alcohol continues to absorb. Test again after 10 minutes to check if your BAC is increasing or decreasing.

Most people record a low or mid-level BAC after two drinks. However, factors such as metabolism, body weight, and time since drinking can lead to a 0.00 reading. On average, one standard drink is processed every hour.

BAC readings differ based on individual factors like weight, gender, metabolism, medications, and whether you’ve eaten. Even with identical alcohol consumption, these variables affect how alcohol is processed.

Recalibrate every 200 uses or 12 months, whichever comes first. Even with infrequent use, accuracy can drift over time.

All recalibrations are conducted at AlcoLimit’s Gold Coast service centre using specialised equipment for precision. However, models with SRS (self-replaceable sensor) technology allow you to replace the sensor yourself.

Yes, our service centre performs recalibration with a fast two-day turnaround. SRS-enabled models allow for user-replacement of pre-calibrated sensors.

Recalibration costs range from $30 to $85, depending on the model. Fees include express return postage.

Common errors include: BAT: Low battery – replace with alkaline batteries. SEN or ER4: Sensor issue – return to AlcoLimit for servicing. FLO: Insufficient breath flow – blow firmly and steadily into the mouthpiece. Check the instruction manual for additional error codes.

This happens when carbon batteries are used instead of alkaline. Always use 1.5V alkaline batteries for optimal performance.

Yes. Mouthpieces are available in packs of 10, 50, or 250 from our Accessories page or selected retailers. Order extras when recalibrating to ensure you always have clean ones on hand.

The device warms the sensor to 34°C to match breath temperature for accuracy. If countdowns take unusually long, the sensor may have alcohol residue build-up and require recalibration.

Alcohol-based products like toothpaste or mouthwash can trigger readings. Avoid eating, drinking, or smoking for at least 10 minutes before testing.

Our mouthpieces are redesigned for better fit, hygiene, and flow accuracy. They are slightly longer and sit more securely in the unit.

No, each sensor is uniquely designed and calibrated for its specific model.

No, sensors require specialised cleaning. Models with SRS technology allow sensor replacement. Others must be sent to our service centre.

Yes, damaged parts such as screens or battery latches can be replaced. Contact our service centre at 1300 667 661 for assistance. Minor parts may be replaced free of charge or for a nominal fee.

We offer several payment options: Credit card (via phone or PayPal). EFT (request an invoice for bank details). Money order (enclose with the unit).