CN111610337A - Alcohol detector calibrating device and method for displaying current calibration allowable error - Google Patents
Alcohol detector calibrating device and method for displaying current calibration allowable error Download PDFInfo
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Abstract
The invention provides an alcohol detector calibrating device and a method for displaying the current calibrating allowable error. The alcohol detector calibrating device comprises: the device comprises a body, an air source, a calculation module and a display module; the gas source, the calculation module and the display module are all arranged in the body, the calculation module is electrically connected with the display module, and the gas source can output alcohol standard gas; the calculation module is used for calculating to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas; the display module is used for displaying the current verification allowable error, the alcohol detector calibrating device is used for directly calculating and displaying the current verification allowable error, the time required by calibrating personnel for calculating the current verification allowable error can be saved, the verification efficiency is improved, and the verification error rate is reduced.
Description
Technical Field
The invention relates to the technical field of alcohol detector calibration, in particular to a method for displaying a current calibration allowable error by an alcohol detector calibration device.
Background
The new exhaled gas alcohol content detector (hereinafter referred to as alcohol detector) metrological verification procedure (JJG657-2019) stipulates the indication error requirement of the alcohol detector: first verification: (-0.040-0) mg/L or relative error-10% -0, meet one of them; and (4) subsequent verification: (-0.060-0) mg/L; or the relative error is-15 to 0, and only one of the relative errors is satisfied.
Compared with the old edition verification procedure, the method has three characteristics: one is that it only allows negative deviations and not positive deviations. The error value of the old version verification rule is positive or negative, and the absolute value of the error value is symmetrical; secondly, the method is divided into two requirements according to whether the instrument is firstly detected or subsequently detected, wherein the absolute value of the error in the subsequent detection is 1.5 times of that in the first detection; third, the standard gas concentration value is expressed by absolute error and relative error value, that is, when the standard gas concentration value is low, the standard gas concentration value is expressed by absolute error, and when the standard gas concentration value is high, the standard gas concentration value is expressed by relative error.
JJG657-2019 also stipulates that ethanol standard gas generated by ethanol gas standard substances (hereinafter referred to as primary standard gas) and generation sources (hereinafter referred to as generation devices) in national first-class certified air is used as gas for verification. In order to verify the indication error of the alcohol detector, a corresponding verification device is provided in the market, wherein the chinese patent with the application number of CN201710563165.3 provides a verification device and a verification method for the alcohol detector, in which, a primary standard gas filled in a steel cylinder is placed in a constant temperature box, the temperature of an air outlet is kept constant to the required 34 ℃ ± 0.5 ℃, meanwhile, the current atmospheric pressure is detected, and the corresponding mass concentration is calculated according to the molar concentration on the steel cylinder for practical verification, and the calculation formula can refer to jjjg 657-. For example, at a standard atmospheric pressure of 34 ℃, the mass concentration of a cylinder-filled alcohol standard gas with the molar concentration of 219ppm is 0.400mg/L, if a certifier measures a certain alcohol detector by using the alcohol standard gas, the allowable indication error range is divided into two types, at the first time of detection, if the measurement result of the alcohol detector is between 0.360mg/L and 0.400mg/L, the detector is qualified, and if the measurement result exceeds the range, the detector is unqualified; and in the subsequent detection, if the measurement result of the alcohol detector is between 0.340mg/L and 0.400mg/L, the instrument is qualified, and is unqualified when the measurement result exceeds the range. Because the allowable error is a negative error and is not a common positive or negative error, for each standard alcohol gas concentration, a checker needs to calculate an allowable error range first to judge whether a checked instrument is qualified or unqualified, and because the outlet temperature and the atmospheric pressure change slightly all the time, the calculated allowable error range also changes, the range needs to be calculated every detection, which is not only troublesome, but also easy to make mistakes in manual calculation, and both the checking efficiency and the checking accuracy are not high.
Disclosure of Invention
The invention aims to provide a calibrating device for an alcohol detector, which can improve calibrating efficiency and reduce calibrating error rate.
The invention also aims to provide a method for displaying the current verification allowable error, which can improve the verification efficiency and reduce the verification error rate.
In order to achieve the above object, the present invention provides an alcohol detector calibrating apparatus, comprising: the device comprises a body, an air source, a calculation module and a display module;
the gas source, the calculation module and the display module are all arranged in the body, the calculation module is electrically connected with the display module, and the gas source can output alcohol standard gas;
the calculation module is used for calculating to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
the display module is used for displaying the current verification allowable error.
The alcohol detector calibrating device also comprises a temperature detection module and a pressure detection module which are arranged in the body;
the temperature detection module and the pressure detection module are respectively used for detecting the current temperature and the current atmospheric pressure;
the calculation module is further used for receiving the current temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas, and calculating the current mass concentration of the alcohol standard gas according to the current temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas.
The alcohol detector calibrating device further comprises a selection module, and the selection module is electrically connected with the calculation module;
the selection module is used for informing the calculation module that the current verification is the first verification or the subsequent verification.
The current verification allowable error comprises an allowable error upper limit, an allowable error middle limit and an allowable error lower limit;
when the selection module informs the calculation module that the current verification is the first verification, the specific formula for determining the allowable error of the current verification by the calculation module is as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
The allowable error of the current verification comprises an upper allowable error limit, a middle allowable error limit and a lower allowable error limit,
when the selection module informs the calculation module that the current verification is the subsequent verification, the specific formula for determining the allowable error of the current verification by the calculation module is as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
The invention also provides a method for displaying the allowable error of the current verification, which comprises the following steps:
step S1, providing an alcohol detector calibrating apparatus, comprising: the device comprises a body, an air source, a calculation module and a display module;
the gas source, the calculation module and the display module are all arranged in the body, the calculation module is electrically connected with the display module, and the gas source can output alcohol standard gas;
step S2, the calculation module calculates to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
and step S3, the display module displays the current verification allowable error.
The body is also provided with a temperature detection module and a pressure detection module;
the calculation module obtains the current mass concentration of the alcohol standard gas through the following steps:
respectively detecting the current temperature and the current atmospheric pressure through a temperature detection module and a pressure detection module;
the calculation module receives the current temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas, and calculates the current mass concentration of the alcohol standard gas according to the current temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas.
The alcohol detector calibrating device further comprises a selection module, and the selection module is electrically connected with the calculation module;
before the calculation module calculates and obtains the current verification allowable error, the method also comprises the step that the selection module informs the calculation module that the current verification is the first verification or the subsequent verification;
the current verification allowable error comprises an allowable error upper limit, an allowable error middle limit and an allowable error lower limit;
when the selection module informs the calculation module that the current verification is the first verification, the specific formula for determining the allowable error of the current verification by the calculation module is as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
The current verification allowable error comprises an allowable error upper limit, an allowable error middle limit and an allowable error lower limit;
when the selection module informs the calculation module that the current verification is the subsequent verification, the specific formula for determining the allowable error of the current verification by the calculation module is as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
The invention has the beneficial effects that: the invention provides a calibrating device for an alcohol detector, which comprises: the device comprises a body, an air source, a calculation module and a display module; the gas source, the calculation module and the display module are all arranged in the body, the calculation module is electrically connected with the display module, and the gas source can output alcohol standard gas; the calculation module is used for calculating to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas; the display module is used for displaying the current verification allowable error, the alcohol detector calibrating device is used for directly calculating and displaying the current verification allowable error, the time required by calibrating personnel for calculating the current verification allowable error can be saved, the verification efficiency is improved, and the verification error rate is reduced. The invention also provides a method for displaying the current verification allowable error, which can improve the verification efficiency and reduce the verification error rate.
Drawings
For a better understanding of the nature and technical aspects of the present invention, reference should be made to the following detailed description of the invention, taken in conjunction with the accompanying drawings, which are provided for purposes of illustration and description and are not intended to limit the invention.
In the drawings, there is shown in the drawings,
FIG. 1 is a block schematic diagram of an alcohol detector calibration apparatus of the present invention;
fig. 2 is a flow chart of a method of the present invention showing current certification allowable error.
Detailed Description
To further illustrate the technical means and effects of the present invention, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Referring to fig. 1, the present invention provides an alcohol detector calibrating apparatus, including: the device comprises a body 10, an air source 20, a calculation module 30 and a display module 40;
the gas source 20, the calculation module 30 and the display module 40 are all arranged in the body 10, the calculation module 30 is electrically connected with the display module 40, and the gas source 20 can output alcohol standard gas;
the calculation module 30 is configured to calculate to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
the display module 40 is used for displaying the current verification allowable error.
Alternatively, the gas source 20 is a steel cylinder filled with standard alcohol gas, although this is not a limitation of the present invention, and those skilled in the art can select other suitable gas sources according to actual needs.
Optionally, the display module 40 is a display screen, preferably a touch screen.
Further, the alcohol detector calibrating device further comprises a temperature detection module 50 and a pressure detection module 60 which are arranged in the body 10; the temperature detection module 50 and the pressure detection module 60 are respectively used for detecting the current air outlet temperature and the current atmospheric pressure;
the calculation module 30 is further configured to receive a current gas outlet temperature, a current atmospheric pressure, and a molar concentration of the alcohol standard gas, and calculate a current mass concentration of the alcohol standard gas according to the current gas outlet temperature, the current atmospheric pressure, and the molar concentration of the alcohol standard gas.
The specific calculation formula of the current mass concentration of the alcohol standard gas is as follows:
in the formula: c is the current mass concentration of the alcohol standard gas, unit: mg/L;
p is the current atmospheric pressure, in units: kPa;
m is the molar mass of the alcohol molecule, 46.07 g/mol;
r is a gas constant of 8.3145 L.kPa/(mol.K);
t is the current temperature, 307.15K (corresponding to 34 ℃);
x is the molar concentration (mole fraction) of the alcohol standard gas, unit: μ mol/mol or PPM.
Preferably, be equipped with on the body 10 with the gas outlet 11 of air supply 20 intercommunication, gas outlet 11 is used for blowing to the alcohol detector that waits to be decided, temperature detection module 50 is located correspondingly gas outlet 11 department to the temperature of real-time detection gas outlet 11 department.
Specifically, the alcohol detector calibrating device further comprises a selection module 70, and the selection module 70 is electrically connected with the calculation module 30; the selection module 70 is used to inform the calculation module 30 that the current certification is the first certification or the subsequent certification.
Optionally, the selection module 70 includes a first key and a second key, and the current verification may be selected as the first verification by selectively pressing the first key, and the current verification may be selected as the subsequent verification by pressing the second key, which is not a limitation of the present invention.
It should be noted that, according to the requirements of the assay protocol, the requirements of the first assay and the subsequent assay for the allowable error are different, and three concentrations of standard gas are required during the assay: 0.1mg/L, 0.4mg/L and 0.6mg/L, the concentration points of the standard gases used must be judged according to the allowable error required by the assay protocol:
when the mass concentration of the standard gas is lower than 0.4mg/L, the absolute error is used for representing;
when the mass concentration of the standard gas is higher than 0.4mg/L, the relative error is used for representing;
when the standard gas mass concentration is equal to 0.4mg/L, the standard gas mass concentration can be expressed by absolute error difference or absolute error.
Accordingly, in the alcohol detector calibration device according to the present invention, the allowable error of the current calibration includes an upper allowable error limit, a middle allowable error limit, and a lower allowable error limit;
when the selection module 70 notifies the calculation module 30 that the current verification is the first verification, the calculation module 30 determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
When the selection module 70 notifies the calculation module 30 that the current verification is the subsequent verification, the calculation module 30 determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
specifically, the display module 40 displays the upper limit, the middle limit and the lower limit of the allowable error, which are all mg/L.
During each detection, a detection person directly reads the upper limit of the allowable error, the middle limit of the allowable error and the lower limit of the allowable error displayed on the display module 40 to judge the detection result, the indication value of the detected alcohol detector exceeds the upper limit of the allowable error or the lower limit of the allowable error to judge that the detected alcohol detector is unqualified, otherwise, the detected alcohol detector is qualified, and the detection person can refer to the fact that when all the alcohol detectors are qualified products and are reasonably calibrated, and when the allowable error meets the Gaussian distribution, the average value of the indication values of the detected alcohol detector is close to the middle limit of the allowable error.
The display module 40 directly displays the allowable error to replace the manual calculation of the calibrating personnel, so that the calibrating efficiency can be improved, and the calibrating error rate can be reduced.
Referring to fig. 2, the present invention further provides a method for displaying a current verification allowable error, including the following steps:
step S1, please refer to fig. 1, providing an alcohol detector calibrating apparatus, comprising: the device comprises a body 10, a gas source 20, a calculation module 30 and a display module 40;
the gas source 20, the calculation module 30 and the display module 40 are all arranged in the body 10, the calculation module 30 is electrically connected with the display module 40, and the gas source 20 can output alcohol standard gas;
step S2, the calculation module 30 calculates to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
step S3, the display module 40 displays the current verification tolerance.
Alternatively, the gas source 20 is a steel cylinder filled with standard alcohol gas, although this is not a limitation of the present invention, and those skilled in the art can select other suitable gas sources according to actual needs.
Optionally, the display module 40 is a display screen, preferably a touch screen.
Specifically, the body 10 is further provided with a temperature detection module 50 and a pressure detection module 60;
the calculation module 30 obtains the current mass concentration of the alcohol standard gas by the following steps:
respectively detecting the current air outlet temperature and the current atmospheric pressure through a temperature detection module 50 and a pressure detection module 60;
the calculation module 30 receives the current gas outlet temperature, the current atmospheric pressure, and the molar concentration of the alcohol standard gas, and calculates the current mass concentration of the alcohol standard gas according to the current gas outlet temperature, the current atmospheric pressure, and the molar concentration of the alcohol standard gas.
The specific calculation formula of the current mass concentration of the alcohol standard gas is as follows:
in the formula: c is the current mass concentration of the alcohol standard gas, unit: mg/L;
p is the current atmospheric pressure, in units: kPa;
m is the molar mass of the alcohol molecule, 46.07 g/mol;
r is a gas constant of 8.3145 L.kPa/(mol.K);
t is the current temperature, 307.15K (corresponding to 34 ℃);
x is the molar concentration (mole fraction) of the alcohol standard gas, unit: μ mol/mol or PPM.
Preferably, be equipped with on the body 10 with the gas outlet 11 of air supply 20 intercommunication, gas outlet 11 is used for blowing to the alcohol detector that waits to be decided, temperature detection module 50 is located correspondingly gas outlet 11 department to the temperature of real-time detection gas outlet 11 department.
Specifically, the alcohol detector calibrating device further comprises a selection module 70, and the selection module 70 is electrically connected with the calculation module 30;
the method further includes a step of notifying the calculation module 30 that the current verification is the first verification or the subsequent verification by the selection module 70 before the calculation module 30 calculates the allowable error of the current verification.
Optionally, the selection module 70 includes a first key and a second key, and the current verification may be selected as the first verification by selectively pressing the first key, and the current verification may be selected as the subsequent verification by pressing the second key, which is not a limitation of the present invention.
It should be noted that, according to the requirements of the assay protocol, the requirements of the first assay and the subsequent assay for the allowable error are different, and three concentrations of standard gas are required during the assay: 0.1mg/L, 0.4mg/L and 0.6mg/L, the concentration points of the standard gases used must be judged according to the allowable error required by the assay protocol:
when the mass concentration of the standard gas is lower than 0.4mg/L, the absolute error is used for representing;
when the mass concentration of the standard gas is higher than 0.4mg/L, the relative error is used for representing;
when the standard gas mass concentration is equal to 0.4mg/L, the standard gas mass concentration can be expressed by absolute error difference or absolute error.
Accordingly, in the alcohol detector calibration device according to the present invention, the allowable error of the current calibration includes an upper allowable error limit, a middle allowable error limit, and a lower allowable error limit;
when the selection module 70 notifies the calculation module 30 that the current verification is the first verification, the calculation module 30 determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
When the selection module 70 notifies the calculation module 30 that the current verification is the subsequent verification, the calculation module 30 determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
specifically, the display module 40 displays the upper limit, the middle limit and the lower limit of the allowable error, which are all mg/L.
During each detection, a detection person directly reads the upper limit of the allowable error, the middle limit of the allowable error and the lower limit of the allowable error displayed on the display module 40 to judge the detection result, the indication value of the detected alcohol detector exceeds the upper limit of the allowable error or the lower limit of the allowable error to judge that the detected alcohol detector is unqualified, otherwise, the detected alcohol detector is qualified, and the detection person can refer to the fact that when all the alcohol detectors are qualified products and are reasonably calibrated, and when the allowable error meets the Gaussian distribution, the average value of the indication values of the detected alcohol detector is close to the middle limit of the allowable error.
The display module 40 directly displays the allowable error to replace the manual calculation of the calibrating personnel, so that the calibrating efficiency can be improved, and the calibrating error rate can be reduced.
In summary, the present invention provides a calibrating apparatus for an alcohol detector, comprising: the device comprises a body, an air source, a calculation module and a display module; the gas source, the calculation module and the display module are all arranged in the body, the calculation module is electrically connected with the display module, and the gas source can output alcohol standard gas; the calculation module is used for calculating to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas; the display module is used for displaying the current verification allowable error, the alcohol detector calibrating device is used for directly calculating and displaying the current verification allowable error, the time required by calibrating personnel for calculating the current verification allowable error can be saved, the verification efficiency is improved, and the verification error rate is reduced. The invention also provides a method for displaying the current verification allowable error, which can improve the verification efficiency and reduce the verification error rate.
As described above, it will be apparent to those skilled in the art that other various changes and modifications may be made based on the technical solution and concept of the present invention, and all such changes and modifications are intended to fall within the scope of the appended claims.
Claims (10)
1. An alcohol detector calibrating device, comprising: the device comprises a body (10), an air source (20), a calculation module (30) and a display module (40);
the gas source (20), the calculation module (30) and the display module (40) are all arranged in the body (10), the calculation module (30) is electrically connected with the display module (40), and the gas source (20) can output alcohol standard gas;
the calculation module (30) is used for calculating to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
the display module (40) is used for displaying the current verification allowable error.
2. The alcohol detector calibration device according to claim 1, further comprising a temperature detection module (50) and a pressure detection module (60) disposed in the body (10);
the temperature detection module (50) and the pressure detection module (60) are respectively used for detecting the current air outlet temperature and the current atmospheric pressure;
the calculation module (30) is further configured to receive a current gas outlet temperature, a current atmospheric pressure, and a molar concentration of the alcohol standard gas, and calculate a current mass concentration of the alcohol standard gas according to the current gas outlet temperature, the current atmospheric pressure, and the molar concentration of the alcohol standard gas.
3. The alcohol detector calibration device according to claim 1, further comprising a selection module (70), wherein the selection module (70) is electrically connected to the calculation module (30);
the selection module (70) is used for informing the calculation module (30) that the current verification is the first verification or the subsequent verification.
4. The alcohol detector calibration device according to claim 3, wherein the current calibration allowable error comprises an upper allowable error limit, a middle allowable error limit, and a lower allowable error limit;
when the selection module (70) informs the calculation module (30) that the current verification is the first verification, the calculation module (30) determines a specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
5. The alcohol detector calibration device according to claim 3, wherein the current calibration allowable error comprises an upper allowable error limit, a middle allowable error limit, and a lower allowable error limit;
when the selection module (70) informs the calculation module (30) that the current verification is the subsequent verification, the calculation module (30) determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
6. A method of displaying a current certification allowable error, comprising the steps of:
step S1, providing an alcohol detector calibrating apparatus, comprising: the device comprises a body (10), an air source (20), a calculation module (30) and a display module (40);
the gas source (20), the calculation module (30) and the display module (40) are all arranged in the body (10), the calculation module (30) is electrically connected with the display module (40), and the gas source (20) can output alcohol standard gas;
step S2, the calculation module (30) calculates to obtain a current verification allowable error according to the current mass concentration of the alcohol standard gas;
and step S3, the display module (40) displays the current verification allowable error.
7. The method for displaying the allowable error of the current verification as claimed in claim 6, wherein a temperature detection module (50) and a pressure detection module (60) are further provided in the body (10);
the calculation module (30) obtains the current mass concentration of the alcohol standard gas through the following steps:
respectively detecting the current air outlet temperature and the current atmospheric pressure through a temperature detection module (50) and a pressure detection module (60);
the calculation module (30) receives the current gas outlet temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas, and calculates the current mass concentration of the alcohol standard gas according to the current gas outlet temperature, the current atmospheric pressure and the molar concentration of the alcohol standard gas.
8. The method of displaying the current certification allowable error as set forth in claim 6, wherein the alcohol detector certification device further comprises a selection module (70), the selection module (70) being electrically connected to the calculation module (30);
the method also comprises the step that the selection module (70) informs the calculation module (30) that the current verification is the first verification or the subsequent verification before the calculation module (30) calculates the current verification allowable error.
9. The method of displaying certification current tolerances as claimed in claim 8, wherein said certification current tolerances include upper tolerance, middle tolerance and lower tolerance limits,
when the selection module (70) informs the calculation module (30) that the current verification is the first verification, the calculation module (30) determines a specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
10. The method of displaying certification current tolerances as claimed in claim 8, wherein said certification current tolerances include upper tolerance, middle tolerance and lower tolerance limits,
when the selection module (70) informs the calculation module (30) that the current verification is the subsequent verification, the calculation module (30) determines the specific formula of the allowable error of the current verification as follows:
Cu＝Cs；
wherein Cs is the current mass concentration of the alcohol standard gas, Cu is the upper limit of the allowable error, Cm is the middle limit of the allowable error, Cd is the lower limit of the allowable error, and the unit is mg/L.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113640529A (en) * | 2021-07-07 | 2021-11-12 | 宁波市计量测试研究院(宁波新材料检验检测中心) | Alcohol detector metering verification method |
| CN113640530A (en) * | 2021-07-26 | 2021-11-12 | 宁波市计量测试研究院(宁波新材料检验检测中心) | Alcohol detector metrological verification management method capable of automatically identifying detection result |
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| CN113640529A (en) * | 2021-07-07 | 2021-11-12 | 宁波市计量测试研究院(宁波新材料检验检测中心) | Alcohol detector metering verification method |
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| CN113640530B (en) * | 2021-07-26 | 2023-10-13 | 宁波市计量测试研究院(宁波新材料检验检测中心) | Alcohol detector metering verification management method capable of automatically identifying detection result |
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