Why do you need an alcohol tester
According to statistics, about 50% of car accidents in the world are related to drinking. If you want to increase the punishment for drinking and driving, the first thing to solve is how to efficiently measure the alcohol content of the human body. This is why the alcohol tester was invented. s reason
How the alcohol tester works？
In fact, the most accurate way to measure a person’s body alcohol level is to check the blood alcohol level in his body, but it requires specific medical conditions and takes a long time. The alcohol tester solves this problem. Its principle is based on measuring the alcohol content in a person’s breath to determine whether it is drunk driving. Because a large number of statistical research results show that people exhale with moderate force for more than three seconds after deep inhalation, and the exhaled air at this time is the air that comes out of the deep lungs. The blood alcohol concentration of the human body and the breath alcohol concentration have a relatively fixed conversion relationship.
1. The commonly used units of Blood Alcohol Concentration (BAC) are:
1. )mg/100ml
2. ) g/100ml is equivalent to % g/ml, simplified to %
3. ) mg/ml is equivalent to ‰g/ml, simplified to ‰
2. The commonly used units of breath alcohol concentration (Breath Alcohol Concentration=BrAC) are:
1. ) mg/L
2. )ug/100ml
3. Conversion relationship between blood alcohol concentration (BAC) and breath alcohol concentration (BrAC)
1. ) conversion formula: BAC (in mg/L) = BrAC (in mg/L) * k
2. ) The conversion factor k in the formula: my country adopts 2200, the United States adopts 2000, and most European countries and Taiwan adopt 2100.
| 1 Unit-? | Mg/100ml | g/100ml or % | mg/ml or ‰ | mg/L | Ug/100ml |
| 1mg/100ml | 1 | 0.001 | 0.01 | 1/220 | 1/2.2 |
| 1g/100ml or1% | 1000 | 1 | 10 | 1/0.22 | 1/0.0022 |
| 1mg/ml or ‰ | 100 | 0.1 | 1 | 1/0.2 | 1/0.022 |
| 1mg/l | 220 | 0.22 | 2.2 | 1 | 100 |
| 1ug/100ml | 2.2 | 0.0022 | 0.22 | 0.01 | 1 |
when k=2000
| 1 Unit-? | mg/100mL | g/100mlor% | mg/ml or ‰
|
mg/L | Ug/100ml |
| 1mg/100ml | 1 | 0.001 | 0.01 | 0.005 | 0.5 |
| 1g/100ml or1% | 1000 | 1 | 10 | 5 | 500 |
| 1mg/ml or ‰ | 100 | 0.1 | 1 | 0.5 | 50 |
| mg/L | 200 | 0.2 | 2 | 1 | 100 |
| 1ug/100ml | 2 | 0.002 | 0.02 | 0.01 | 1 |
Standard breath alcohol tester technical indicators
Working conditions:
Temperature: the upper and lower limits of the working temperature range from 0°C to 40°C
Humidity: The upper and lower limits of the working humidity range from 20%RH to 90%RH
Atmospheric pressure: 86kpa~106kpa
There is no gas or electromagnetic field around that will affect the normal operation of the instrument
Determination indicators of alcohol tester
Indication error, it is required to meet the following requirements in the whole working range:
| Range /(mg/L) | Error |
| ＜0.200 | ±0.025/L |
| 0.200～0.400 | ±0.040mg/L |
| 0.400～1.1000 | ±10% |
Repeatability refers to the repeated detection of the same gas source under the same conditions, and the displayed value can be within the error range. It is an indicator of the stability of the instrument’s measurement value. The repeatability of the indicated value should meet the requirements of the following table：
| Range/（mg/L） | Repeatability |
| ＜0.400 | ±0.006mg/L |
| 0.100～1.1000 | ±1.5% |
The anti-interference ability refers to the sensitivity of the alcohol tester to the gas. The ideal alcohol tester should only respond to alcohol and not to other gases.
