Essential Knowledge: Choosing Your Breath Analyzer
Alcohol Breath Analyzer
Alcohol measurement type
Alcohol Breath Analyzer Evidential Test
Evidential breath testing devices produce printouts and data that are legally admissible as evidence in court.
Alcohol Breath Analyzer Screening Test
A screening breath analyzer is designed for rapid, initial testing. The results are typically used for preliminary screening and are generally not admissible as legal evidence.
Alcohol Sensor
There are two types of alcohol breath analyzer sensors.
Electrochemical Cell
Alcohol breath analyzer using electrochemical sensors provide the highest accuracy. There was no effect of volatile substances such as candy, glue or perfume.
Semiconductor
Alcohol breath analyzer using semi-conductor sensors provide primarily designed for personal use and accurate measurements at lower BAC levels, but are typically used for non-evidential, personal screening.
Questions
What is breath alcohol concentration?
Blood or breath alcohol concentration (BAC) is the amount of alcohol in your body and is measured by the concentration of alcohol in your breath or blood. It is measured in grams of alcohol per 100mL. of blood.
How long can breath analyzer detect alcohol?
Alcohol is typically eliminated from the body at an average rate of 0.015% BAC per hour. Breath analyzers can detect alcohol as long as it remains in the bloodstream and is high enough to register above the device’s detection limit. For most people, the period is around 24 hours, depending heavily on the amount they consumed.
How do you convert BAC to mg% ?
The results of analysis may be expressed in any of the common methods for blood alcohol concentration.
MG% = milligrams of alcohol in 100 milliliters of blood
%BAC = grams of alcohol in 100 milliliters of blood
The relationship between these expressions is illustrated breath as follow:
For example : = 0.05 %BAC × 1,000
= 50 mg%
How do you calibrate a breath analyzer?
Calibration is checking and adjusting the accuracy of a unit by comparing its result with a traceable reference standard.
During the calibration process, the breath analyzer is tested by using a certified breath alcohol simulator which will generate a certified concentration alcohol vapor into the device. Then the device’s reading is verified comparing the reference standard within the Maximum Permissible Error (MPE) to confirm its accuracy.
How often do you calibrate a breath analyzer?
The standard calibration frequency is between 6 to 12 months. However, some models may require calibration based on a specific number of tests performed. Please note that the calibration process may take several business days to complete.
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