CN105021674A - Verification method of gas humidity detector - Google Patents
Verification method of gas humidity detector Download PDFInfo
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- CN105021674A CN105021674A CN201510451774.0A CN201510451774A CN105021674A CN 105021674 A CN105021674 A CN 105021674A CN 201510451774 A CN201510451774 A CN 201510451774A CN 105021674 A CN105021674 A CN 105021674A
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Abstract
The invention relates to a verification method of a gas humidity detector. The gas humidity detector comprises a sample feeding system, a detection system and a data processing and controlling system. The verification method comprises the following steps: verifying the sample feeding system: measuring a sample feeding amount of the sample feeding system by using a soap film flow meter; comparing a measured value of the soap film flow meter with a detection value of the detector to verify the flow size and the metering accuracy of the sample feeding system; verifying the detection system: injecting distilled water or desalted water with the known amount into an electrolytic tank of the detector; comparing a theoretical value of distilled water with the detection value of the detector or comparing the theoretical value of the desalted water and the detection value of the detector to verify the accuracy of the detection system; and verifying the detection accuracy of the gas humidity detector: adopting nitrogen gas with known humidity, and comparing the theoretical value of the humidity of the nitrogen gas and the detection value of the detector to verify the detection accuracy of the detector. According to the verification method of the gas humidity detector, the sample feeding system, the detection system and the detector are wholly verified so that the detection performance of the detector can be relatively effectively evaluated.
Description
Technical field
The present invention relates to method of calibration, be specifically related to a kind of method of calibration of gas humidity detector.
Background technology
Karl Fischer coulometric determination utilizes principle of electrochemical reaction to measure the assay method of moisture, a kind of maturation, classical trace water content and measurement result chemical method the most accurately, often by the standard method of analysis as moisture particularly ppm traces of moisture, in order to correct other assay method, develop SF based on the method
6the detector of gas humidity; This detector is different from dew point method and capacitance-resistance method SF
6gas humidity detector, because it is a kind of absolute method of measurement, it effectively, really can detect SF
6the humidity of gas; Therefore, the quality of detecting instrument performance is directly connected to the accuracy of testing result, vital to the verification of this kind of method instrument.
Existing method of calibration generally can only verify its accuracy detected on the whole, can not detect the accuracy of concrete various piece, and be difficult to find concrete reason.
Summary of the invention
The invention provides a kind of method of calibration that can verify the accuracy of sampling system, detection system and whole detection respectively.
The technical solution used in the present invention is: gas humidity detector comprises sampling system, detection system and data processing and control system, and its method of calibration comprises the following steps:
Sampling system verifies: adopt soap-film flowmeter to measure sampling system sample size, by comparing soap-film flowmeter measured value and detector detected value, and verification sampling system uninterrupted and metering accuracy;
Detection system verifies: the electrolytic cell distilled water of known quantity or demineralized water being injected detector, by comparing theoretical value and the detector detected value of distilled water, or the theoretical value of demineralized water and detector detected value, the accuracy of verification detection system;
Gas humidity detector detection accuracy verifies: the nitrogen adopting known humidity, by comparing theoretical value and the detector detected value of nitrogen humidity, and verification detector detection accuracy.
As preferably, the gas sampling amount size that in described sampling system verification, environmentally the measurement of soap-film flowmeter obtains by temperature and atmospheric pressure is converted into status of criterion lower volume, compares with detector detected value.
As preferably, measure the sample size of at least 2 soap-film flowmeters in described sampling system verification, average, calculate relative error, meet the relative error range of setting, then judge that detector sampling system is accurate.
As preferably, described relative error magnitudes is not more than 0.8% of soap-film flowmeter full scale, judges that detector sampling system is accurate.
As preferably, the standard specimen of known moisture content is injected detector electrolytic cell by described detection system checking procedure, by comparing theoretical value and the detector detected value of water cut, and the accuracy of verification detection system.
As preferably, in described detection system verification, carry out at least twice parallel experiment.
As preferably, the relative error of described detected value and theoretical value is no more than ± and 5%, judge that detector detection system is accurate.
As preferably, at least measure 10 samples in described gas humidity detector detection accuracy checking procedure, calculate its standard deviation, meet the Standard deviation-Range of setting, then judge that detector is accurate.。
As preferably, described standard deviation is 7.14-1.10%, judges that detector is accurate.
As preferably, described soap-film flowmeter is the standard digital soap-film flowmeter through calibration.
The invention has the beneficial effects as follows:
(1) the present invention can verify sampling system, detection system and detector entirety, can the quality of effectively evaluating detecting instrument detection perform more;
(2) to verify accuracy higher, more targeted in the present invention.
Accompanying drawing explanation
Fig. 1 is gas humidity detector structural representation in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Gas humidity detector comprises sampling system, detection system and data processing and control system, and its method of calibration comprises the following steps:
Sampling system verifies: adopt soap-film flowmeter to measure sampling system sample size, by comparing soap-film flowmeter measured value and detector detected value, and verification sampling system uninterrupted and metering accuracy;
Detection system verifies: the electrolytic cell distilled water of known quantity or demineralized water being injected detector, by comparing theoretical value and the detector detected value of distilled water, or the theoretical value of demineralized water and detector detected value, the accuracy of verification detection system;
Gas humidity detector detection accuracy verifies: the nitrogen adopting known humidity, by comparing theoretical value and the detector detected value of nitrogen humidity, and verification detector detection accuracy.
The gas sampling amount size measurement of soap-film flowmeter obtained in sampling system verification is converted into status of criterion lower volume, compares with detector detected value; Measure the sample size of at least 2 soap-film flowmeters in sampling system verification, average, calculate relative error; Relative error magnitudes is not more than 0.8% of soap-film flowmeter full scale, judges that detector sampling system is accurate.
During verification, the injection port of the standard digital soap-film flowmeter through calibration is adopted to be connected with gas humidity detector drain place; Add suds to soap-film flowmeter, detector starts sample introduction and starts sample introduction simultaneously and open soap-film stream metering button simultaneously, writes down the uninterrupted of gas humidity detector and soap-film flowmeter respectively; Record environment temperature, atmospheric pressure, then the size of gas humidity detector gas sampling amount is converted into status of criterion lower volume size, with the mean value of soap-film flowmeter three metric results, calculate relative error, its value is not more than 0.8% of full scale, then judge detector detection accuracy, if relative error magnitudes is greater than 0.8% of full scale, then need to calibrate detector.
The standard specimen of known moisture content is injected detector electrolytic cell by detection system checking procedure, and by comparing theoretical value and the detector detected value of water cut, the accuracy of verification detection system, at least carries out twice parallel experiment; The relative error of detected value and theoretical value is no more than ± and 5%, judge that detector detection system is accurate.
During verification, measure the standard specimen of 0.1 μ L distilled water, demineralized water or known moisture content with 0.5 μ L syringe, open detection instrument hand sampling pattern, inject electrolytic cell by the hand sampling mouth on electrolytic cell top, carry out three parallel experiments; The displayed value i.e. relative error of its detected value and theoretical value of detector is no more than ± 5%, then judge that detector is accurate, if the displayed value of the detector i.e. relative error of its detected value and theoretical value exceed ± 5%, then need to calibrate detector.
At least measure 10 samples in gas humidity detector detection accuracy checking procedure, calculate its standard deviation; Standard deviation is 7.14-1.10%, judges that detector is accurate.
During verification, the nitrogen choosing 4 kinds of different humidity detects, and after each sample determination 5 times, calculate its standard deviation to testing result, its standard deviation is 7.14-1.10%, then judge that detector is accurate; If standard deviation is not within the scope of this, then need to calibrate detector.
The present invention is mainly in based on Karl Fischer coulometric determination SF
6the verification of gas humidity detector, because this gas humidity detector is higher for accuracy requirement, so its verification is more important; The present invention adopts verification sampling system, verification detection system and the detection accuracy of entirety to carry out simultaneously, can the quality of effective evaluation detector detection perform.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a method of calibration for gas humidity detector, gas humidity detector comprises sampling system, detection system is entered and data processing and control system, it is characterized in that, comprises the following steps:
Sampling system verifies: adopt soap-film flowmeter to measure sampling system sample size, by comparing soap-film flowmeter measured value and detector detected value, and verification sampling system uninterrupted and metering accuracy;
Detection system verifies: the electrolytic cell distilled water of known quantity or demineralized water being injected detector, by comparing theoretical value and the detector detected value of distilled water, or the theoretical value of demineralized water and detector detected value, the accuracy of verification detection system;
Gas humidity detector detection accuracy verifies: the nitrogen adopting known humidity, by comparing theoretical value and the detector detected value of nitrogen humidity, and verification detector detection accuracy.
2. the method for calibration of a kind of gas humidity detector according to claim 1, is characterized in that: the gas sampling amount size measurement of soap-film flowmeter obtained in described sampling system verification is converted into status of criterion lower volume, compares with detector detected value.
3. the method for calibration of a kind of gas humidity detector according to claim 1, it is characterized in that: the sample size measuring at least 2 soap-film flowmeters in described sampling system verification, average, calculate relative error, meet the relative error range of setting, then judge that detector sampling system is accurate.
4. the method for calibration of a kind of gas humidity detector according to claim 3, is characterized in that: described relative error magnitudes is not more than 0.8% of soap-film flowmeter full scale, judges that detector sampling system is accurate.
5. the method for calibration of a kind of gas humidity detector according to claim 1, it is characterized in that: the standard specimen of known moisture content is injected detector electrolytic cell by described detection system checking procedure, by comparing theoretical value and the detector detected value of water cut, the accuracy of verification detection system.
6. the method for calibration of a kind of gas humidity detector according to claim 1, is characterized in that: carry out at least twice parallel experiment in described detection system verification.
7. the method for calibration of a kind of gas humidity detector according to claim 1 or 5, is characterized in that: the relative error of described detected value and theoretical value is no more than ± and 5%, judge that detector detection system is accurate.
8. the method for calibration of a kind of gas humidity detector according to claim 1, it is characterized in that: in described gas humidity detector detection accuracy checking procedure, at least measure 10 samples, calculate its standard deviation, meet the Standard deviation-Range of setting, then judge that detector is accurate.
9. the method for calibration of a kind of gas humidity detector according to claim 8, is characterized in that: described standard deviation is 7.14-1.10%, judges that detector is accurate.
10. the method for calibration of a kind of gas humidity detector according to claim 1, is characterized in that: described soap-film flowmeter is the standard digital soap-film flowmeter through calibration.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110850040A (en) * | 2019-12-18 | 2020-02-28 | 西安格远自动化科技有限公司 | Hygrograph inspection method and standard humidity generation device and method |
| US20210372978A1 (en) * | 2019-03-08 | 2021-12-02 | Ball Wave Inc. | System, method and program for calibrating moisture sensor |
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| CN101315315A (en) * | 2008-07-04 | 2008-12-03 | 北京工业大学 | Single-pump double-gas path sampling device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20210372978A1 (en) * | 2019-03-08 | 2021-12-02 | Ball Wave Inc. | System, method and program for calibrating moisture sensor |
| US11982659B2 (en) * | 2019-03-08 | 2024-05-14 | Ball Wave Inc. | System, method and program for calibrating moisture sensor |
| CN110850040A (en) * | 2019-12-18 | 2020-02-28 | 西安格远自动化科技有限公司 | Hygrograph inspection method and standard humidity generation device and method |
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