Customer service

Interlock program customers should contact their local installation office for all matters related to equipment or appointment scheduling. Please select your nearest jurisdiction below.


Toll free in North America: +1 877 227 7112, +1 416 619 3500

A member of our customer service team will be pleased to assist you.

Dealers are encouraged to email us at A member of our customer service team will be pleased to assist you.

Register your product

Registering your product with ACS helps ensure your warranty is in good standing. If registering multiple units of the same model, simply separate each serial number with a comma.

Please complete all required fields (*) before submitting:

Calibration / Repairs

It is recommended that you have your device calibrated at least once per year and that only qualified technicians perform maintenance of any breath alcohol tester.

STEP 1. Complete the Service Request Form

STEP 2. Print a copy and sent it along with the unit to:

Alcohol Countermeasure Systems Corp.
60 International Boulevard
Toronto, Ontario  M9W 6J2 

Attn: Service

For more information about calibration services please refer to the calibration FAQ section.

Please complete all required fields (*) on the Service Request Form below, when you require calibration or other maintenance/repair services not covered under warranty.

Customer information

Product information

Repair Calibration Maintenance

Ensure that a copy of this form is sent along with the unit to:

Alcohol Countermeasure Systems
60 International Boulevard
Toronto, Ontario M9W 6J2

Attn: Service

Warranty and returns

This section is for services covered under Warranty only. For information about calibration and other services click here

ACS breath alcohol testers are warranted to be free from defects in workmanship and material for one(1) year from the date of purchase. It is recommended that only qualified technicians perform maintenance of any breath alcohol tester.

If you require warranty services please complete and follow the instructions in the Return Material Authorization(RMA)form below. Note that we may contact you for furhter information if necessary. Once it has been approved we would issue a RMA number and send it to you along with other instructions by email, or fax.

Please do not ship any products back to Alcohol Countermeasure Systems Corp without a valid RMA number. If you have problems submitting this form please call Customer Service at 1-416-619-3500 for assistance.

Upon receiving your RMA number you may send your product to:

ACS Warranty Services
60 International Boulevard
Toronto, Ontario  M9W 6J2 

Attn: Service

Important note
Unless agreed upon, the customer is responsible for all shipping costs and must insurce the package for the purchased value.

Whenever returning an item to Alcohol Countermeasure Systems Corp, we require the following:

  • Please return all products with original documentation.
  • Retrn all parts and/or accessories. The actual replacement cost for missing items will
    be deducted from your refund/credit.
  • Clearly place the RMA# on a label and attach it to the outside of the box
  • Place this form inside the box.

Please complete all required fields(*) before submitting:

Return Material Authorization(RMA) Request

Inspection/Replace Credit
Check the box to acknowledge the information above is accurate


Our breathalyzers operate within ± 5% accuracy for every breath test result.

Choose the best breathalyzer that will fit your needs with the Find Your Best Fit function here

It is recommended that you calibrate your breathalyzer once every year. Please contact your local service provider for more information on calibration costs.

When a breathalyzer needs to be calibrated, contact your local service provider and ship the device prepaid to the service centre. Once the calibration is complete, the device will be shipped back to you.

Yes, you have to use a mouthpiece for all of the breathalyzer units, except for ALCOCHECK™. It is not recommended to reuse mouthpieces due to hygiene and potential damage to internal components in the device.

The readings displayed on the breathalyzer shows the BAC (Blood Alcohol Concentration) level of the breath sample.

Both terms are relevant to each other; however, some countries use BAC and some use BrAC.

Yes, they both use an industry certified fuel cell sensor.

Yes, depending on the temperature threshold of the device. Please consult the instruction manual for further information.

Store your device indoors, at room temperature when not in use. Ensure that the breathalyzer is not used/stored in extremely hot or cold environments or in direct light for prolonged periods of time.

If a breathalyzer is left in your vehicle, there is a chance that it might not work efficiently. Consult the instruction manual for further information.

Yes, there is a one-year warranty that is included when you purchase any breathalyzer that only covers factory defects. Damages caused by misuse or mishandling are the owner’s responsibility. If a device needs to be repaired outside of warranty, please ship it prepaid to a local service centre.

If your device is still within the one-year warranty, you can ship it prepaid to the nearest service centre for repair. The device will be repaired or replaced if a factory defect has been assessed. If the warranty has expired, we will assess the damage(s) and provide you with a quote.

Yes, you can extend the warranty for your breathalyzer by contacting your local service provider.

An ignition interlock consists of a handset to conduct breath alcohol tests with and relays messages to the driver and an Electronic Control Unit (ECU) that is connected to the power and control circuits of the vehicle.

An ignition interlock device controls the normal operation of a vehicle through a connection with the vehicle starter. To start the engine, the driver must provide an acceptable breath sample with a Breath Alcohol Concentration (BrAC) below the preset limit.

At our Service Centres, we ensure that every installation goes smoothly and according to plan. Our trained technicians are certified and know exactly how to treat your vehicle. If, however, you experience difficulties with your ignition interlock, please contact us for assistance.

During normal operation, the device requests the driver to provide additional breath samples at fixed or random intervals to ensure that alcohol has not been consumed since starting the engine.

Our ignition interlock devices will never cause the vehicle engine to stop. The handset will beep to notify you of the retest request, and the timer will activate and give you sufficient time to stop in a safe location before providing a breath sample. We do not recommend performing a breath test while the vehicle is in motion.

We also install ignition interlocks on motorcycles, but certain modifications may apply.

Calibration is the process of checking and adjusting the sensor within your breathalyzer to ensure it displays an accurate reading.

There are 3 different types of sensors used in breathalyzer devices: semiconductors, electrochemical and infrared. No matter what kind of breathalyzer device you use, it needs to be calibrated on a regular basis.

Without calibration, the sensor will begin displaying inaccurate and inconsistent results and eventually become damaged.

Calibration ensures that the sensor is in great working condition, results will be accurate and accuracy will be consistent. Calibration also ensures that all components of the breathalyzer are working properly, free of defects and are well maintained, extending the overall lifespan of the breathalyzer device.

In addition, damage to the sensor caused by delaying calibration is not covered under the device warranty.

There are different breathalyzer calibration methods depending on the type of sensor within the breathalyzer device. Semiconductors and electrochemical sensors can be calibrated using a breath alcohol simulator or compressed gas standard. Infrared sensors can be calibrated using gas calibration.

A breath alcohol simulator uses an alcohol reference solution to mimic a person providing a breath sample. An alcohol reference solution is a liquid with a known alcohol content level. The breath alcohol simulator connects to the breathalyzer and provides a sample. If the breathalyzer results indicate an incorrect breath alcohol concentration, the device is reset to the accurate reading.

Compressed Gas Standard requires a gas tank filled with oxygen and ethanol. The gas tank connects to the breathalyzer device and mimics a breath test. If the breathalyzer results do not correspond to the known alcohol level indicated on the gas tank, the breathalyzer is adjusted to the correct level.

No matter which calibration method is used, a trained laboratory technician must perform the calibration process.

Depending on the type of device and the purpose, recommended calibration times vary. Most breathalyzers with a display screen will display CAL when the tester is due for calibration. For breathalyzers with LED lights, refer to your user manual to see how calibration is required is displayed.

In general, a personal breathalyzer device will indicate that calibration is required after 1 year or 5000 tests; breathalyzers for law enforcement should be calibrated once per month.

Calibration is needed sooner if your breathalyzer is providing inconsistent results, results that are abnormally high or low, or the device is not displaying results at all.

Just as it is important to calibrate a breathalyzer to ensure the sensor is reporting an accurate reading, it is essential to calibrate the ALCOSIM to ensure all components are working correctly and can calibrate breathalyzer devices effectively and efficiently.

The following is a list of reasons why it is important to calibrate the ALCOSIM:

• ensure that the firmware is up-to-date

• ensure that the temperature of 34 °C is reached and maintained

• ensure that all components are working properly and free of defects

If any components of the ALCOSIM are not in working order or working effectively, the ALCOSIM will not calibrate breathalyzer devices accurately which can damage the breathalyzer sensor.

The ALCOSIM requires calibration at least once per year to ensure that the latest firmware is installed and that all components are in optimal working condition. The ALCOSIM may need to be calibrated sooner if you notice that it is taking longer than usual to reach 34 °C or that the temperature is not being maintained. The ALCOSIM may also need calibration sooner than once a year if it does not seem to be calibrating breathalyzer devices properly.

The calibration process includes the following procedures:

• Check for and install firmware updates

• Check hardware to ensure all components are in optimal condition

• Heat and stabilize the ALCOSIM at 34 °C; ensure the heater is working efficiently and the temperature remains within the expected range

• Calibration is performed by using a thermometer to track the temperature of the ALCOSIM. The temperature is raised and lowered; the amount of time it takes for the ALCOSIM to adjust back to 34 °C is recorded. The calibration process ensures the heater and all other components are working properly.

• Verify calibration by completing the process again with a second temperature probe to ensure the results are accurate and consistent

A trained laboratory technician must perform the calibration process.

For price information for our calibration services, contact Customer Service at

With 40 years of experience producing and maintaining breath alcohol testing products, we know how to keep your device working to its greatest potential. When your breathalyzer requires calibration, simply send it to ACS and we’ll calibrate it and ensure that all components are in optimal condition.

Alternatively, you can enroll in the ACS Product Protection Plan, which includes 4 breathalyzer calibrations per year as well as many other services which ensure your device is perfectly maintained and kept in great working condition.

With our experience and expertise creating industry-leading breath alcohol testing technology, there is no better way to ensure that your breathalyzer is working accurately and in optimal condition.

Equipment that requires service should be individually wrapped and packed securely before it is shipped prepaid to an authorized service centre. Contact Alcohol Countermeasure Systems for more details: Email:


To maintain the accuracy of the device, most alcohol testers require calibration each year from the first date of use or after a set number tests. When calibration is due, “CAL” will appear on the display of the device. When the tester is due for a calibration, contact an authorized Service Centre.

If the breath alcohol tester is being used by multiple people it is strongly recommended to use a new mouthpiece for each individual. If the tester is used by a single person, a new mouthpiece is not necessary each time. However, moisture collects in the mouthpiece and if moisture enters the tester it may damage the equipment’s capabilities and result in costly repairs that are not covered by warranty. If a new mouthpiece is not used each time ensure that the mouthpiece is visibly dry.

Units must be stored in a clean environment that is free from fumes, chemicals or pollution.

Storage temperature must be within the 10°C to 30°C range.

For optimal performance, run at least 10 tests with the unit every month. This will keep the humidity in the sensor.

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