CN111781312A - Method for calibrating online dew point instrument - Google Patents
Method for calibrating online dew point instrument Download PDFInfo
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- CN111781312A CN111781312A CN202010723083.2A CN202010723083A CN111781312A CN 111781312 A CN111781312 A CN 111781312A CN 202010723083 A CN202010723083 A CN 202010723083A CN 111781312 A CN111781312 A CN 111781312A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/007—Arrangements to check the analyser
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0006—Calibrating gas analysers
Abstract
The invention discloses a method for calibrating an online dew point instrument, and relates to the technical field of online dew point instrument calibration. The main technical scheme of the invention is as follows: a method of calibrating an online dew point meter, comprising: connecting an online dew point meter with a current signal source; obtaining a first indication error and a first repeatability detection result of the online dew point instrument according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of a display instrument of the online dew point instrument; connecting a sensor of the online dew point instrument with an unmounted calibrated display instrument, placing the online dew point instrument into a temperature and humidity calibration box, and simultaneously placing a probe of a standard dew point instrument into the temperature and humidity calibration box; acquiring second standard dew point temperatures of the standard dew point instruments at a plurality of temperature points and a second dew point temperature of the calibrated display instrument, and obtaining a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature; the online dew point meter is calibrated.
Description
Technical Field
The invention relates to the technical field of online dew point instrument calibration, in particular to a method for calibrating an online dew point instrument.
Background
The industrial fixedly-installed online dew point instrument is used for continuously analyzing the humidity of air or other closed pipeline gases, is widely applied to remote monitoring of industrial and living environments, internal monitoring of industrial pipelines, internal monitoring of closed environments for natural gas (various industrial gases such as liquefied gas and nitrogen) conveying and the like, ensures that the internal environmental conditions of the conveying pipeline meet the requirements through monitoring, ensures that the conveying pipeline is effectively protected, and is unlikely to be damaged by water vapor corrosion, ice resistance and the like.
However, for the industrial fixed-installation online dew point meter, no effective method is available for periodic calibration detection, and the disassembly and the calibration are not required, but for the remote fixed-installation online dew point meter, the disassembly affects the industrial production and damages the installation environment.
Therefore, how to calibrate the online dew point meter becomes an urgent problem to be solved.
Disclosure of Invention
In view of the above, the present invention provides a calibration method for an online dew point meter, and mainly aims to calibrate a fixedly installed online dew point meter.
In one aspect, the invention provides a method for calibrating an online dew point meter, comprising the following steps:
connecting an online dew point meter with a current signal source;
obtaining a first indication error and a first repeatability detection result of the online dew point instrument according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of the online dew point instrument display instrument;
connecting a sensor of an online dew point instrument with an unmounted calibrated display instrument, placing the online dew point instrument into a temperature and humidity calibration box, and simultaneously placing a probe of a standard dew point instrument into the temperature and humidity calibration box;
acquiring second standard dew point temperatures of the standard dew point instruments and second dew point temperatures of the calibrated display instruments at a plurality of temperature points, and acquiring a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperatures and the second dew point temperatures;
calibrating the online dew point instrument according to the first indicating value error, the first repeatability detection result, the second indicating value error and the second repeatability detection result;
wherein, online dew point meter includes display instrument and sensor.
In this technical solution, the obtaining a first indication error and a first repeated detection result of the online dew point meter according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of the online dew point meter display instrument includes:
according to the plurality of first standard dew point temperatures, the current signal source outputs corresponding current corresponding to each first standard dew point temperature;
obtaining a plurality of first actual dew point temperatures of the display instrument according to a plurality of currents output by the current signal source;
obtaining a first indicating value error of the online dew point instrument according to the plurality of first actual dew point temperatures and the plurality of first standard dew point temperatures;
and carrying out repeated detection on the display instrument of the online dew point instrument to obtain a first repeated detection result.
In this technical solution, the obtaining a first indication error of a display instrument of the online dew point meter according to the plurality of first actual dew point temperatures and the plurality of first standard dew point temperatures includes:
obtaining a first current indication error according to the difference between each first actual dew point temperature and the corresponding first standard dew point temperature;
and selecting the largest of the plurality of first current indicating value errors as the first indicating value error.
In this technical solution, the repeatedly detecting the display instrument of the online dew point meter to obtain a first repeatedly detecting result includes:
selecting any one of the first standard dew point temperatures;
according to the first standard dew point temperature, the current signal source repeatedly outputs the corresponding current for n times;
outputting n times of repeatedly output current according to the current signal source, and acquiring n first actual dew point temperatures by the display instrument;
and obtaining a repeated detection result according to the n first actual dew point temperatures and the plurality of first standard dew point temperatures.
In this embodiment, the obtaining a repeated detection result according to the n first actual dew point temperatures and the plurality of first standard dew point temperatures includes:
obtaining an average value of the first actual dew point temperatures according to the n first actual dew point temperatures;
obtaining a first repeated detection result S according to the average value of the plurality of first standard dew point temperatures and the first actual dew point temperaturen1，
Wherein: t isiIs the ith first standard dew point temperature;
In this technical solution, the obtaining a second standard dew point temperature of the standard dew point instrument and a second dew point temperature of the calibrated display instrument at the plurality of temperature points, and obtaining a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature includes:
acquiring the second actual dew point temperature of the display instrument at each temperature point and a second standard dew point temperature of the standard dew point instrument after calibration according to the plurality of temperature points of the temperature and humidity calibration box;
obtaining a second indication error of the sensor according to the plurality of second standard dew point temperatures and the plurality of second actual dew point temperatures;
and carrying out repeatability detection on the sensor of the online dew point meter to obtain a second repeatability detection result.
In this technical solution, the obtaining a second indication error of the sensor according to the plurality of second standard dew point temperatures and the plurality of second actual dew point temperatures includes:
obtaining a corresponding second current indicating value error according to each second actual dew point temperature, the second standard dew point temperature and a first current indicating value error corresponding to the display instrument;
selecting the largest of the plurality of second current indicating value errors as the second indicating value error;
wherein Δ T ═ Ti-T0-ti|max
Δ T is a second indication error of the sensor;
T0is a second standard dew point temperature;
T0iis the ith second actual dew point temperature;
tii first current indicating errors of the instrument are displayed.
In this technical solution, the performing a repetitive detection on the sensor of the online dew point meter to obtain a second repetitive detection result includes:
selecting any one of the temperature points;
obtaining the second dew point temperature value at the temperature point for a plurality of times;
and obtaining a second repeatability detection result according to the plurality of second dew point temperature values.
In this technical solution, the obtaining a second repeatability detection result according to the plurality of second dew point temperature values includes:
obtaining an average value of the second dew point temperature values according to the plurality of second dew point temperature values;
obtaining a second repeatability detection result S according to the average value of the second dew point temperature values and each second dew point temperature value2n，
Wherein: t is1iThe ith second dew point temperature value;
In the technical scheme, the current signal source repeatedly outputs the corresponding current for 10 times.
The method for calibrating the online dew point instrument can provide a basis for the calibration of the fixedly installed online dew point instrument, and the display instrument in the online dew point instrument does not need to be disassembled in the calibration process, so that manpower and material resources are saved, and the calibration of the fixedly installed online dew point instrument is greatly facilitated.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood and to implement them in accordance with the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is a schematic flow chart of a calibration method of an online dew point meter according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of another method for calibrating an online dew point meter according to an embodiment of the present invention;
FIG. 3 is a schematic view of an installation in a method for calibrating an on-line dew point instrument according to an embodiment of the present invention;
fig. 4 is a schematic view illustrating a calibration method of an online dew point meter and an installation of a temperature and humidity calibration box according to an embodiment of the present invention.
Reference numerals and descriptions:
the device comprises an online dew point meter 10, a current signal source 12, a display instrument 14, a temperature and humidity calibration box 20 and a standard dew point meter 22.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given of the embodiments, structures, features and effects of the method for calibrating an on-line dew point instrument according to the present invention with reference to the accompanying drawings and preferred embodiments.
The embodiment of the invention provides a method for calibrating an online dew point instrument, which comprises the following steps of:
according to the model specification of the on-line dew point meter 10, a dew point temperature and related conversion output current signal debugging corresponding table provided by a manufacturer is taken, as shown in table 1, the table may be linear or nonlinear, the output current corresponding to each dew point temperature can be obtained according to the table 1, and when the on-line dew point meter 10 is calibrated, the current signal source 12 is connected with the on-line dew point meter by adopting a special compensation connecting lead and a corresponding output interface.
| Serial number | Dew point temperature (. degree. C.) | Output Current value (mA) |
| 1 | -80 | 20.000 |
| 2 | -60 | 16.800 |
| 3 | -40 | 13.600 |
| 4 | -20 | 10.400 |
| 5 | 0 | 7.200 |
| 6 | 20 | 4.000 |
TABLE 1
102, obtaining a first indication error and a first repeated detection result of the online dew point instrument according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of the online dew point instrument display instrument;
according to the table 1, the current signal source 12 outputs different currents according to the expected first standard dew point temperature, after the current signal source 12 outputs the current, the display instrument 14 of the online dew point instrument 10 displays the first actual dew point temperature, and then the first indication error and the first repeated detection result of the online dew point instrument 10 are obtained according to the first standard dew point temperature and the first actual dew point temperature.
103, connecting a sensor of the online dew point instrument with an unmounted calibrated display instrument, placing the sensor into a temperature and humidity calibration box, and simultaneously placing a probe of a standard dew point instrument into the temperature and humidity calibration box;
the online dew point meter 10 comprises a display instrument 14 and a sensor, wherein the sensor is detachable from a joint part, and the display instrument 14 is not detachable, so that when the sensor is calibrated, as shown in fig. 3, the sensor is connected with another set of display instrument 14 which is calibrated offline, then the connected sensor is put into a temperature and humidity calibration box 20, and meanwhile, a probe of a standard dew point meter 22 is also put into the temperature and humidity calibration box 20, so that the sensor is calibrated through the temperature and humidity calibration box 20 and the standard dew point meter 22.
104, acquiring second standard dew point temperatures of the standard dew point instruments and second dew point temperatures of the calibrated display instruments at a plurality of temperature points, and obtaining a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperatures and the second dew point temperatures;
the temperature point of the temperature and humidity calibration box 20 can be set as a normal temperature point of a line dew point instrument, multiple points between 15 ℃ and 30 ℃ are generally selected as temperature points, and a calibration humidity point is set as relative humidity: 20%, 40%, 60%, and 80%, when the temperature and humidity calibration box 20 is at each temperature point, obtaining a reading of the corresponding display instrument 14 connected to the sensor, that is, the second dew point temperature, and correspondingly reading the second standard dew point temperature of the standard dew point instrument 22, so as to obtain a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature.
the online dew point meter 10 includes, among other things, a display meter 14 and a sensor.
As shown in fig. 4, in the calibration method of the online dew point meter 10 provided by the present invention, the online dew point meter 10 comprises a display instrument 14 and a sensor, wherein the display instrument 14 cannot be disassembled, the sensor can be disassembled, the online dew point meter 10 is firstly connected with a current signal source 12, the current signal source 12 outputs different currents by considering a first standard dew point temperature reached, after the current signal source 12 outputs a current, the display instrument 14 of the online dew point meter 10 displays a first actual dew point temperature, then a first indication error and a first repeated detection result of the online dew point meter 10 are obtained according to the first standard dew point temperature and the first actual dew point temperature, and since the sensor can be disassembled, the sensor is separately calibrated, the sensor is connected with the display instrument 14 which is subjected to offline calibration, and then the connected sensor is placed in a temperature and humidity calibration box 20, meanwhile, a probe of a standard dew point instrument 22 is also placed in the temperature and humidity calibration box 20, the temperature point of the temperature and humidity calibration box 20 can be set as a normal temperature point of the line dew point instrument, a plurality of points between 15 ℃ and 30 ℃ are generally selected as temperature points, and a calibration humidity point is set as relative humidity: 20%, 40%, 60%, and 80%, when the temperature and humidity calibration box 20 is at each temperature point, obtaining a corresponding reading of the display instrument 14 connected to the sensor, that is, a second dew point temperature, and correspondingly reading a second standard dew point temperature of the standard dew point instrument 22, so as to obtain a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature, and finally calibrating the online dew point instrument 10 according to the first indication error, the first repeatability detection result, the second indication error, and the second repeatability detection result. The method for calibrating the online dew point meter 10 can provide a basis for the calibration of the online dew point meter 10 which is fixedly installed, the display instrument 14 in the online dew point meter 10 does not need to be disassembled in the calibration process, manpower and material resources are saved, and the calibration of the online dew point meter 10 which is fixedly installed is greatly facilitated.
The object of the present invention and the technical problems solved thereby can be further achieved by the following technical measures.
As shown in fig. 2, another method for calibrating an online dew point meter according to an embodiment of the present invention includes:
according to table 1, according to the first standard dew point temperature desired to be reached, the current signal source outputs the corresponding current according to the first standard dew point temperature.
step 2010, calibrating the online dew point instrument according to the first indicating error, the first repeatability detection result, the second indicating error and the second repeatability detection result.
In another calibration method of the on-line dew point instrument 10 provided by the invention, firstly, the on-line dew point instrument 10 is connected with a current signal source 12, the current signal source 12 outputs different currents by considering the reached first standard dew point temperature, after the current signal source 12 outputs the current, a display instrument 14 of the on-line dew point instrument 10 displays a first actual dew point temperature, then a first indication error and a first repeated detection result of the on-line dew point instrument 10 are obtained according to the first standard dew point temperature and the first actual dew point temperature, then a sensor is connected with another set of display instrument 14 which is calibrated off-line, the connected sensor is put into a temperature and humidity calibration box 20, a probe of a standard dew point instrument 22 is also put into the temperature and humidity calibration box 20, the temperature point of the temperature and humidity calibration box 20 can be set as a normal temperature point of the on-line dew point instrument, a plurality of points between 15 ℃ and 30 ℃ are generally selected as temperature points, set calibration humidity point to relative humidity: 20%, 40%, 60%, and 80%, when the temperature and humidity calibration box 20 is at each temperature point, obtaining a corresponding reading of the display instrument 14 connected to the sensor, that is, a second dew point temperature, and correspondingly reading a second standard dew point temperature of the standard dew point instrument 22, so as to obtain a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature, and finally calibrating the online dew point instrument 10 according to the first indication error, the first repeatability detection result, the second indication error, and the second repeatability detection result. The method for calibrating the online dew point meter 10 can provide a basis for the calibration of the online dew point meter 10 which is fixedly installed, the display instrument 14 in the online dew point meter 10 does not need to be disassembled in the calibration process, manpower and material resources are saved, and the calibration of the online dew point meter 10 which is fixedly installed is greatly facilitated.
Wherein, step 204 specifically includes:
2041, obtaining a first current indication error according to the difference between each first actual dew point temperature and the corresponding first standard dew point temperature;
step 2042, select the largest of the plurality of first current indication errors as the first indication error.
In the embodiment, each actual dew point temperature and the corresponding first standard dew point temperature are used for obtaining a first current indication error corresponding to the actual dew point temperature, so that a plurality of first current indication errors are obtained, the standard dew point temperatures are not less than 5, and one of the first current indication errors with the largest absolute value is selected as the first indication error of the online dew point instrument.
Wherein step 205 specifically comprises:
step 2051, selecting any one of the first standard dew point temperatures;
step 2052, repeatedly outputting the corresponding current for n times by the current signal source according to the first standard dew point temperature;
step 2053, outputting n times of repeatedly output current according to the current signal source, and acquiring n first actual dew point temperatures by the display instrument 14;
step 2054, obtaining an average value of the first actual dew point temperatures according to the n first actual dew point temperatures;
step 2055, obtaining a first repeated detection result S according to the average value of the plurality of first standard dew point temperatures and the first actual dew point temperaturen，
Wherein: t isiIs the ith first standard dew point temperature;
In this embodiment, the display instrument 14 of the online dew-point meter 10 is repeatedly tested to obtain a first repeated test result, specifically, any one of the first standard dew-point temperatures is selected as a temperature point for repeated testing, the current signal source 12 outputs current corresponding to the first standard dew-point temperature according to the selected first standard dew-point temperature, and repeatedly outputs the current n times, each time the current signal source 12 outputs the online dew-point meter 10 to obtain a first actual dew-point temperature, so as to obtain n first actual dew-point temperatures, an average value of the first actual dew-point temperatures is obtained according to the n first actual dew-point temperatures, and a first repeated test result S is obtained according to the plurality of first standard dew-point temperatures and the average value of the first actual dew-point temperaturesn1，
Wherein: t isiIs the ith first standard dew point temperature;
is the average of n first actual dew point temperatures.
Alternatively, n may be 10, but may be other times.
Wherein step 208 specifically comprises:
step 2081, obtaining a corresponding second current indicating value error according to each second actual dew point temperature, the second standard dew point temperature and the first current indicating value error corresponding to the display instrument;
step 2082, selecting the largest of the second current indicating value errors as the second indicating value error;
wherein Δ T ═ Ti-T0-ti|max
Δ T is a second indication error of the sensor;
T0is a second standard dew point temperature;
T0iis the ith second actual dew point temperature;
tito display the i first current indicating errors of the meter 14.
In this embodiment, each actual dew point temperature and the corresponding first standard dew point temperature are used to obtain a first current indication error corresponding to the actual dew point temperature, so as to obtain a plurality of first current indication errors, and one of the plurality of first current indication errors with the largest absolute value is selected as the first indication error of the online dew point instrument 10.
Obtaining a corresponding second standard dew point temperature according to each second actual dew point temperature, and displaying a corresponding first current indicating error of the instrument 14 under the second standard dew point temperature, so that the second current indicating error Δ T is that Δ T ═ Ti-T0-ti|max，T0Is a second standard dew point temperature; t is0iIs the ith second actual dew point temperature; t is tiTo display the i first current indicating errors of the meter 14.
Step 209 specifically comprises:
step 2091, selecting any one of the temperature points;
step 2092, acquiring the second dew point temperature value at the temperature point for multiple times;
step 2093, obtaining an average value of the second dew point temperature values according to the plurality of second dew point temperature values;
step 2094, averaging the second dew point temperature valueObtaining a second repeatability detection result S for each second dew point temperature value2n，
Wherein: t is1iThe ith second dew point temperature value;
In this embodiment, any suitable temperature point is selected from the plurality of temperature points, so that the temperature and humidity calibration box 20 stabilizes the temperature at the temperature point for a plurality of times, thereby obtaining the second dew point temperature at the temperature point for a plurality of times, recording a reading every 1 minute, wherein the number of continuous recording times can be 10 times, thereby obtaining an average value of a plurality of second dew point temperature values according to the plurality of second dew point temperatures, and obtaining a second repeatability detection result S according to the average value of the second dew point temperature values and each second dew point temperature value2n，
Wherein: t is1iThe ith second dew point temperature value;
the average of the readings of the sensor is measured n times.
In this embodiment, the current signal source repeatedly outputs the corresponding current 10 times.
In the method for calibrating the online dew point instrument, the online dew point instrument comprises a display instrument and a sensor, wherein the display instrument cannot be disassembled, the sensor can be disassembled, the online dew point instrument is firstly connected with a current signal source, the current signal source outputs different currents by considering the reached first standard dew point temperature, after the current signal source outputs the current, the display instrument of the online dew point instrument displays a first actual dew point temperature, then a first indication error and a first repeated detection result of the online dew point instrument are obtained according to the first standard dew point temperature and the first actual dew point temperature, and the sensor can be disassembled, so that the sensor is independently calibrated, the sensor is connected with another set of display instrument which is calibrated offline, then the connected sensor is placed in a temperature and humidity calibration box, and simultaneously, a probe of the standard dew point instrument is also placed in the temperature and humidity calibration box, the temperature point with the humiture calibration case can set up to line dew point meter normality temperature point, generally selects a plurality of points between 15 ~ 30 ℃ as the temperature point, sets for the calibration humidity point and is relative humidity: 20%, 40%, 60% and 80%, when the temperature and humidity calibration box is at each temperature point, obtaining a corresponding reading of a display instrument connected with the sensor, namely a second dew point temperature, and correspondingly reading a second standard dew point temperature of a standard dew point instrument, so as to obtain a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature, and finally calibrating the online dew point instrument according to the first indication error, the first repeatability detection result, the second indication error and the second repeatability detection result. The method for calibrating the online dew point instrument can provide a basis for the calibration of the fixedly installed online dew point instrument, and the display instrument in the online dew point instrument does not need to be disassembled in the calibration process, so that manpower and material resources are saved, and the calibration of the fixedly installed online dew point instrument is greatly facilitated.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A method of calibrating an online dew point meter, comprising:
connecting an online dew point meter with a current signal source;
obtaining a first indication error and a first repeatability detection result of the online dew point instrument according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of the online dew point instrument display instrument;
connecting a sensor of an online dew point instrument with an unmounted calibrated display instrument, placing the online dew point instrument into a temperature and humidity calibration box, and simultaneously placing a probe of a standard dew point instrument into the temperature and humidity calibration box;
acquiring second standard dew point temperatures of the standard dew point instruments and second dew point temperatures of the calibrated display instruments at a plurality of temperature points, and acquiring a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperatures and the second dew point temperatures;
calibrating the online dew point instrument according to the first indicating value error, the first repeatability detection result, the second indicating value error and the second repeatability detection result;
wherein, online dew point meter includes display instrument and sensor.
2. The method for calibrating an on-line dew point instrument according to claim 1, wherein the obtaining a first indication error and a first repeated detection result of the on-line dew point instrument according to a first standard dew point temperature corresponding to the output current of the current signal source and a first actual dew point temperature of the on-line dew point instrument display instrument comprises:
according to the plurality of first standard dew point temperatures, the current signal source outputs corresponding current corresponding to each first standard dew point temperature;
obtaining a plurality of first actual dew point temperatures of the display instrument according to a plurality of currents output by the current signal source;
obtaining a first indicating value error of the online dew point instrument according to the plurality of first actual dew point temperatures and the plurality of first standard dew point temperatures;
and carrying out repeated detection on the display instrument of the online dew point instrument to obtain a first repeated detection result.
3. The method for calibrating an online dew point meter as claimed in claim 2, wherein the step of obtaining a first indication error of a display instrument of the online dew point meter according to the plurality of first actual dew point temperatures and the plurality of first standard dew point temperatures comprises:
obtaining a first current indication error according to the difference between each first actual dew point temperature and the corresponding first standard dew point temperature;
and selecting the largest of the plurality of first current indicating value errors as the first indicating value error.
4. The method for calibrating an online dew point meter according to claim 2, wherein the repeatedly detecting the display instrument of the online dew point meter to obtain a first repeatedly detecting result comprises:
selecting any one of the first standard dew point temperatures;
according to the first standard dew point temperature, the current signal source repeatedly outputs the corresponding current for n times;
outputting n times of repeatedly output current according to the current signal source, and acquiring n first actual dew point temperatures by the display instrument;
and obtaining a repeated detection result according to the n first actual dew point temperatures and the plurality of first standard dew point temperatures.
5. The method for calibrating an online dew point meter as claimed in claim 4, wherein said obtaining a plurality of repeated measurements based on said n first actual dew point temperatures and said plurality of first standard dew point temperatures comprises:
obtaining an average value of the first actual dew point temperatures according to the n first actual dew point temperatures;
obtaining a first repeated detection result S according to the average value of the plurality of first standard dew point temperatures and the first actual dew point temperaturen1，
Wherein: t isiIs the ith first standard dew point temperature;
6. The method for calibrating an online dew point meter according to claim 1, wherein the obtaining a second standard dew point temperature of the standard dew point meter and a second dew point temperature of the calibrated display meter at a plurality of temperature points, and obtaining a second indication error and a second repeatability detection result of the sensor according to the second standard dew point temperature and the second dew point temperature comprises:
acquiring the second actual dew point temperature of the display instrument at each temperature point and a second standard dew point temperature of the standard dew point instrument after calibration according to the plurality of temperature points of the temperature and humidity calibration box;
obtaining a second indication error of the sensor according to the plurality of second standard dew point temperatures and the plurality of second actual dew point temperatures;
and carrying out repeatability detection on the sensor of the online dew point meter to obtain a second repeatability detection result.
7. The method of calibrating an on-line dew point meter of claim 6, wherein said deriving a second indication error of said sensor from said plurality of second standard dew point temperatures and said plurality of second actual dew point temperatures comprises:
obtaining a corresponding second current indicating value error according to each second actual dew point temperature, the second standard dew point temperature and a first current indicating value error corresponding to the display instrument;
selecting the largest of the plurality of second current indicating value errors as the second indicating value error;
wherein Δ T ═ Ti-T0-ti|max
Δ T is a second indication error of the sensor;
T0is a second standard dew point temperature;
T0iis the ith second actual dew point temperature;
tii first current indicating errors of the instrument are displayed.
8. The method of claim 6, wherein the performing a repetitive test on the sensor of the online dew point meter to obtain a second repetitive test result comprises:
selecting any one of the temperature points;
obtaining the second dew point temperature value at the temperature point for a plurality of times;
and obtaining a second repeatability detection result according to the plurality of second dew point temperature values.
9. The method of claim 8, wherein obtaining a second repeatable test result from the plurality of second dew point temperature values comprises:
obtaining an average value of the second dew point temperature values according to the plurality of second dew point temperature values;
obtaining a second repeatability detection result S according to the average value of the second dew point temperature values and each second dew point temperature value2n，
Wherein: t is1iThe ith second dew point temperature value;
10. The method of calibrating an online dew point meter of claim 4,
the current signal source repeatedly outputs the corresponding current for 10 times.
Priority Applications (1)
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