CN111751048A - Pressure sensor online checking device and method matched with digital instrument - Google Patents
Pressure sensor online checking device and method matched with digital instrument Download PDFInfo
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Abstract
The invention discloses an online calibration device of a pressure sensor matched with a digital instrument, which comprises a three-way pipeline, a stop valve and a calibration port, wherein the three-way pipeline comprises an inlet pipeline, an outlet pipeline and a bypass pipeline; the stop valve is installed on the inlet pipeline, and the calibration port is installed on the export of bypass line, and the calibration port is used for being connected with standard pressure source. The pressure sensor on-line calibration method for the digital instrument is also disclosed, and the pressure sensor and the digital instrument are electrified and preheated; closing the stop valve; connecting a standard pressure source; loading a standard pressure value; if the comprehensive precision of the pressure sensor to be detected and the digital instrument is in a qualified range, the detection is finished; if the comprehensive accuracy of the pressure sensor to be verified and the digital instrument is in the unqualified range, loading a standard pressure value, and carrying out pairing calibration on the pressure sensor and the digital instrument; and after the calibration is finished, loading a standard pressure value, and re-calibrating the comprehensive precision of the pressure sensor and the digital instrument.
Description
Technical Field
The invention belongs to the technical field of pressure sensor detection, and particularly relates to a pressure sensor online checking device and method matched with a digital instrument.
Background
Pressure sensors on the aircraft parts testing equipment must be periodically certified, or certified after a pressure spike, over-range event, to a certification department. According to the JJG860-1994 pressure sensor (static) verification regulation (hereinafter referred to as verification regulation), the verification department records the output value of the detection instrument for the full-range of the sensor, including some pressure points concerned by the using party of the equipment, by adding or subtracting the standard pressure by using a gas piston type pressure gauge. After repeated cycles of loading and unloading are sequentially performed for the sensor, the verification result gives: and (4) obtaining a verification conclusion of the precision grade of the sensor by using the repeatability error, the return error, the linear error, the basic error (accuracy), the full-scale output value and the working linear equation. The digital instrument matched with the sensor also needs to be periodically sent to a verification department for verification. And for the sensor and the digital instrument with the accuracy grade lower than the original grade of the test equipment in the verification conclusion, if the degraded use cannot ensure the requirement on the accuracy of the detection product, the sensor and the digital instrument are forbidden.
Because the careless mistake in dismantlement, censorship, reinstallation pressure sensor and digital instrument in-process very easily causes the damage, include: wiring errors; damage to pressure sensors and digital instruments with precise integrated circuits caused by transportation collision; the pressure sensor is disassembled and assembled for many times, so that the installation thread is smooth, and the like. In some digital instruments with the adjusting function, if PID adjusting parameters are mistakenly changed in the verification process, although the verification work is not influenced, the pressure adjusting system of the test equipment after the reinstallation has problems, and the production is seriously influenced.
Disclosure of Invention
The invention aims to provide an online calibration device and method for a pressure sensor matched with a digital instrument, which can carry out pairing calibration and calibration work on the pressure sensor and the digital instrument under the condition of not disassembling the pressure sensor.
The invention is realized by the following technical scheme:
an online calibration device of a pressure sensor matched with a digital instrument comprises a three-way pipeline, a stop valve and a calibration port, wherein the three-way pipeline comprises an inlet pipeline, an outlet pipeline and a bypass pipeline;
the stop valve is arranged on the inlet pipeline, and the inlet pipeline is used for being communicated with the equipment pressure measuring pipeline;
the outlet pipeline is used for being connected with the pressure sensor;
and the calibration port is arranged on the outlet of the bypass pipeline and is used for being connected with a standard pressure source.
Further, a plug is arranged on the calibration port.
Further, the standard pressure source employs a gas piston manometer.
The invention also discloses an online calibration method of the pressure sensor matched with the digital instrument, which is used for detecting by using the online calibration device of the pressure sensor matched with the digital instrument and specifically comprises the following steps:
s1, communicating the inlet pipeline with the equipment pressure measuring pipeline, and electrifying and preheating the pressure sensor and the digital instrument;
s2, closing the stop valve;
s3, connecting a standard pressure source to the calibration port;
s4, the pressure sensor and the matched digital instrument are verified: loading a standard pressure value by using a standard pressure source, and recording the loaded standard pressure value, a display value of a digital instrument and the output voltage or current value of a pressure sensor;
s5, if the comprehensive precision of the pressure sensor to be detected and the matched digital instrument is in the qualified range, the detection is finished;
if the comprehensive precision of the pressure sensor to be verified and the matched digital instrument is in the unqualified range, performing pairing calibration on the pressure sensor and the matched digital instrument;
and S6, repeating the step S4 after the calibration is finished, and verifying the comprehensive accuracy of the calibrated pressure sensor and the matched digital instrument again.
Further, in step S4, the process of loading the standard pressure value specifically includes: a plurality of detection points are selected according to the full-range of the pressure sensor, a standard pressure source is used for sequentially increasing the pressure and loading standard pressure values, and then the pressure is sequentially reduced and loading the standard pressure values.
Further, the certification points include pressure points that the equipment user requires to detect.
Further, in step S4, the recording data specifically includes: and recording the digital instrument pressure display value and the digital multimeter verification data of each verification point on a data table.
Further, in step S5, the pairing calibration process is specifically divided into 2 types according to the signal receiving manner of the digital instrument:
(1) calibration with standard pressure source pressure: sequentially increasing or decreasing the pressure and loading standard pressure values, and setting a corresponding display value of the digital instrument as a loaded standard pressure indicating value in a matching manner;
(2) calibration with set digital meter parameters of the output voltage or current values of the pressure sensor: and averaging the multiple detection values of the output voltage or current of the pressure sensor of the same detection point recorded in the detection process, and configuring the corresponding relation between the voltage or current detection values and the standard loading pressure displayed by the instrument on the digital instrument from low to high or from high to low in sequence.
Further, after loading the standard pressure value each time, checking the pressure maintaining condition, specifically: the circuit was confirmed to be leak free and there was no pressure decay at each setpoint.
And further, after the verification is finished, reducing the pressure of the standard pressure source to zero, disconnecting the standard pressure source and opening the stop valve.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention discloses an online calibration device of a pressure sensor matched with a digital instrument, which comprises a three-way pipeline, a stop valve and a calibration port, wherein the online calibration device is provided with the online calibration port, and can effectively calibrate a calibration result. The inlet pipeline of the three-way pipeline is connected in series with the equipment pressure measuring pipeline, the stop valve is initially in an open state, and the pressure sensor and the matched digital instrument are used for measuring and displaying the pressure of the equipment main pipeline. During on-line calibration, the calibration port is connected with the standard pressure source to calibrate the pressure sensor and the matched digital instrument, so that the time for stopping and sending the pressure sensor and the matched digital instrument for calibration is reduced. The problems that the damage of the detected piece caused by inspection sending, disassembly and assembly and the error calibration of a digital instrument by a user of the equipment and the on-site verification correctness cannot be realized to cause serious quality accidents are avoided when no on-line verification device is provided. After the online calibration is finished, only the calibration port needs to be sealed. The device has simple structure, easy manufacture and low cost, and can save a lot of workload for the equipment user and the verification party and save the time of the two parties.
Furthermore, a plug is arranged on the calibration port, and the calibration port is sealed by the plug at ordinary times, so that the measurement and display of the pressure sensor and a matched digital instrument on the pressure of the main pipeline of the equipment are not influenced.
The pressure sensor on-line checking method matched with the digital instrument can directly carry out checking on the equipment pressure measuring pipeline, reduces the time for stopping the pressure sensor and the matched digital instrument for checking, avoids the damage of a checked piece caused by checking, dismounting and mounting, and solves the problems that the equipment user can not check the correctness on site due to wrong calibration of the digital instrument, thereby causing serious quality accidents. (ii) a The pressure sensor and the digital instrument can be matched and calibrated on site without disassembling the pressure sensor, and after the calibration is finished, the pressure sensor and the digital instrument can be calibrated on site by using a standard pressure source. When the verification result is at the degraded use edge and the pressure sensor is in the product stabilization period, the equipment user can continuously use the pressure sensor and the digital instrument according to the original precision grade through the pairing calibration of the pressure sensor and the digital instrument, so that the waste is avoided, and the detection quality of the tested product is ensured; the pressure detection process conforms to detection regulations, and the comprehensive precision of the pressure sensor and the digital instrument can be detected.
Furthermore, the verification points comprise pressure points required to be detected by a device user, and special points can be specially verified, so that the precision is improved.
Further, for the pairing calibration process in the mode (1), if the online calibration device is not provided, a user can not carry out online calibration, and a calibration department can not carry out online calibration; for the pairing calibration process of the mode (2), the user unit can be implemented on line, but without the online calibration device, the calibration department cannot perform online calibration, and thus the calibration certification can not be given. If the 2 calibration methods are to be implemented in the verification department, the pressure sensor and the digital instrument need to be disassembled, damage is easily caused, and the two calibration processes can be implemented on line after the online verification and calibration device is installed on the pressure measuring pipeline.
Furthermore, after the standard pressure value is loaded each time, the pressure maintaining condition is checked, it is confirmed that no pressure attenuation exists at each detection point, and the measured data is accurate after the pressure is stable.
Drawings
FIG. 1 is a schematic structural diagram of an online calibration device for a pressure sensor of a digital instrument of the present invention;
FIG. 2 is a schematic view of an installation structure of the pressure sensor on-line calibration device for a digital instrument of the present invention;
fig. 3 is a data linearity diagram of an data acquisition system according to example 3 of the present invention, in which the thick line is a theoretical pressure-voltage curve of a pressure sensor and the thin line is an actual calibration curve.
Wherein, 1 is the inlet pipeline, 2 is the outlet pipeline, 3 is the bypass pipeline, 4 is the stop valve, 5 is the end cap.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
As shown in fig. 1 and 2, the pressure sensor online calibration device matched with a digital instrument disclosed by the invention comprises a three-way pipeline, a stop valve 4 and a calibration port, wherein the three-way pipeline comprises an inlet pipeline 1, an outlet pipeline 2 and a bypass pipeline 3; the stop valve 4 is initially in an open state, the stop valve 4 is installed on the inlet pipeline 1, and the inlet pipeline 1 is used for being communicated with an equipment pressure measuring pipeline; the outlet pipeline 2 is used for connecting with a pressure sensor; and the calibration port is arranged on the outlet of the bypass pipeline 3 and is used for being connected with a standard pressure source.
Preferably, the calibration port is provided with a plug 5, and the calibration port is sealed by the plug 5 at ordinary times, so that the measurement and display of the pressure sensor and the matched digital instrument on the pressure of the main pipeline of the equipment are not influenced.
Typically, standard pressure sources employ gas piston gauges.
The following examples are provided to illustrate the detection method of the on-line calibration device for pressure sensor of a digital instrument.
Example 1
An online calibration method for a pressure sensor matched with a digital instrument specifically comprises the following steps:
(1) electrifying the pressure sensor and the matched digital instrument: the equipment user transmits power to the equipment, and the instrument is preheated for 30 minutes to reach a stable working state of the instrument; the pressure sensor may be fed by a digital meter, both of which are energized, with the warm-up being for the meter to reach a steady state temperature drift.
(2) And (4) closing the stop valve: the equipment user turns off the pressure measuring pipeline inlet of the pressure sensor to be calibrated on the equipment;
(3) connecting a standard pressure source for assay and a digital multimeter: the calibration department unscrews the calibration port plug 5, connects the standard pressure source for calibration to the pressure gauge calibration port, and connects the high-performance digital multimeter to the signal input end of the digital instrument, namely: a pressure sensor signal output terminal for reading a voltage or current signal;
(4) loading a standard pressure value: aiming at the full-range of the pressure sensor, including some pressure points concerned by the equipment user, a verification department selects a plurality of verification points and loads standard pressure values by sequentially increasing and reducing the pressure by using a standard pressure source;
specifically, the pressure sensor with the pressure sensor range of 0-7000 KPa and the output voltage of 0-10V is taken as an example, the pressure sensor connected with the digital instrument is stepped up to 6000KPa by using a standard pressure source, and then stepped down to 0.
The digital instrument display values recorded in the first inspection are as follows:
(5) checking the pressure maintaining condition: confirm that the circuit is leak free and that there is no pressure decay at each setpoint;
(6) recording data: corresponding to the step (4), the verification department records the digital instrument pressure display numerical value and the digital multimeter verification data corresponding to each verification point on a data table, as shown in the upper table;
(7) and (4) analysis of the verification result: the display value of the digital instrument is inconsistent with the loaded standard pressure value, the comprehensive precision of the pressure sensor and the digital instrument is detected to be in an unqualified range, and the matching calibration work of the pressure sensor and the matched digital instrument is required;
the pairing calibration work specifically comprises the following steps: selecting a plurality of calibration points according to the full-range of the pressure sensor, and sequentially increasing or decreasing the pressure by using a standard pressure source to load a standard pressure value; the equipment user performs pairing calibration work on the pressure sensor and the digital instrument according to the operation instruction of the digital instrument; the method specifically comprises the following steps:
(7.1) entering a digital instrument programming mode setting page;
(7.2) selecting the number n of the calibration points to be 15;
(7.3) calibrating by selecting step-by-step pressure (A) of the pressure sensor by using a standard pressure source;
(7.4) adjusting the standard pressure for calibration step by step, operating in coordination with the instrument parameter key, and receiving the pressure calibration point An (n is 1, 2, 3, 4, 5 … … 15);
(7.5) corresponding to the step (7.4), corresponding display values Dn (n is 1, 2, 3, 4, 5 … … 15) of calibration points An (n is 1, 2, 3, 4, 5 … … 15) of each stage are interactively set.
More preferably, after each pressure loading, a check is made for pressure retention: the circuit was confirmed to be leak free and there was no pressure decay at each calibration point.
(8) And (5) repeating the steps (4) to (6) after the pressure values of the specified points are matched and calibrated, and verifying the comprehensive precision of the calibrated pressure sensor and the matched digital instrument again to verify whether the calibration result is qualified. If not, the pressure sensor and the matched digital instrument are forbidden to be used, and if not, the pressure sensor and the matched digital instrument can be continuously used.
The subsequent ending work specifically comprises the following steps:
after all data points are verified, the verification department reduces the pressure of the standard pressure source to zero;
standard pressure source for disconnection assay: the calibration department disconnects the standard pressure source for calibration from the calibration port, and the calibration port is sealed by a plug 5;
opening the stop valve 4: and the user of the equipment is connected with a pressure measuring pipeline of the pressure sensor which is verified on the equipment.
Finally, labeling the qualified instruments: the calibration department arranges the recorded calibration data, evaluates various errors of the pressure sensor and the digital instrument to be tested according to the calibration data and the regulation requirements, issues a calibration certificate, provides a calibration qualified mark for the pressure sensor and the digital instrument of the equipment and grants the next calibration period.
In this embodiment, in the process of loading the standard pressure value, the number n of the selected calibration points or calibration points is 15, which sequentially includes:
point 1: a pressurization pressure point X1, typically 0;
and (2) point: the pressurization pressure point X2, X2 is a certain pressure point specified by the user of the equipment;
and 3, point: the pressurization pressure point X3, X3 is a certain pressure point specified by the user of the equipment;
……
point 15: the pressurization pressure point, X15, is typically the maximum range of the pressure sensor.
The specific calibration process is as follows:
pressing a meter parameter key to enter a digital meter programming mode setting page;
selecting the number of calibration points: n is 15;
selecting a calibration mode: a (pressure calibration);
selecting a plurality of calibration points for the full-range of the pressure sensor, and gradually boosting the pressure sensor connected with the digital instrument to 6000KPa by using a standard pressure source;
during the boosting process, the standard pressure source and the digital instrument are operated interactively:
(1) calibration Point 1
Adjusting the standard pressure to be initial 0;
when the pressure is stable, the pressure is received by pressing a meter parameter key: a1 ═ 0;
setting a display value of a calibration point 1 on the instrument; d1 ═ 0.0;
pressing a parameter key of the instrument to receive the calibration;
(2) calibration Point 2
Adjusting the standard pressure to 200 KPa;
when the pressure is stable, the pressure is received by pressing a meter parameter key: a2 ═ 200;
setting a display value of a calibration point 2 on the instrument; d2 ═ 200.0;
pressing a parameter key of the instrument to receive the calibration;
(3) calibration Point 3
……
(15) Calibration points 15
Adjusting the standard pressure to 6000 KPa;
when the pressure is stable, the pressure is received by pressing a meter parameter key: a15 ═ 6000;
setting the display value of the calibration point 15 on the meter; d15 ═ 6000.0;
pressing a parameter key of the instrument to receive the calibration;
and (5) exiting the digital instrument programming mode setting page by pressing an instrument parameter key, and finishing calibration.
And returning to the verification work, and performing rechecking of the calibration effect.
The digital instrument display values recorded by the recheck are as follows:
and (4) analysis of the verification result: and (4) the display value of the digital instrument is completely consistent with the loaded standard pressure value, the comprehensive precision of the pressure sensor and the digital instrument is determined to be in a qualified range, the verification is finished, and the subsequent ending work is executed.
Example 2
An online calibration method for a pressure sensor matched with a digital instrument specifically comprises the following steps:
(1) energizing the pressure sensor and the digital meter: the equipment user transmits power to the equipment, and the instrument is preheated for 30 minutes to reach a stable working state;
(2) and (4) closing the stop valve: the equipment user turns off the pressure measuring pipeline inlet of the pressure sensor to be calibrated on the equipment;
(3) connecting a standard pressure source for assay and a digital multimeter: the calibration department unscrews the calibration port plug 5, connects the standard pressure source for calibration to the pressure gauge calibration port, and connects the high-performance digital multimeter to the signal input end of the digital instrument, namely: a pressure sensor signal output terminal for reading a voltage or current signal;
(4) loading a standard pressure value: aiming at the full-range of the pressure sensor, including some pressure points concerned by the equipment user, a verification department selects a plurality of verification points and loads standard pressure values by sequentially increasing and reducing the pressure by using a standard pressure source;
taking the range of the pressure sensor to be 0-700 KPa and the output voltage to be 0-10V as an example, selecting a plurality of detection points, gradually increasing the pressure of the pressure sensor connected with the digital instrument to 700KPa by using a standard pressure source, and then gradually reducing the pressure to 0.
The digital instrument display value recorded in the first inspection and the output voltage value of the pressure sensor are as follows:
(5) checking the pressure maintaining condition: confirm that the circuit is leak free and that there is no pressure decay at each setpoint;
(6) recording data: corresponding to the step (4), the verification department records the digital instrument pressure display numerical value and the high-performance digital multimeter verification data corresponding to each verification point on a data table, as shown in the upper table;
(7) and (4) analysis of the verification result: the display value of the digital instrument is inconsistent with the loaded standard pressure value, the comprehensive precision of the pressure sensor and the digital instrument is detected to be in an unqualified range, and the matching calibration work of the pressure sensor and the matched digital instrument is required;
aiming at the full-range of the pressure sensor, selecting a plurality of verification point voltage or current verification data as calibration point numerical values, typing the numerical values from low to high or from high to low, averaging the multiple verification values of the same verification point, and carrying out pairing calibration work on the pressure sensor and the digital instrument by an equipment user according to the operation instruction of the digital instrument, wherein the method specifically comprises the following steps:
(7.1) entering a digital instrument programming mode setting page;
(7.2) selecting the number n of the calibration points to be 8;
(7.3) selecting to set digital instrument parameters for calibration with the output voltage value (K) of the pressure sensor;
(7.4) setting the pressure sensor output voltage values recorded during the certification process at each of the certification points into the digital instrument parameters K n (n ═ 1, 2, 3, 4, 5 … … 8);
(7.5) in the correspondence step (7.4), the correspondence display value Dn (n is 1, 2, 3, 4, 5 … … 8) of each of the detection point parameters K n (n is 1, 2, 3, 4, 5 … … 8) is set.
(8) And (5) matching the pressure values of the calibrated specified points, repeating the steps (4) to (6), verifying the calibration effect, wherein the display value of the digital instrument is completely consistent with the loaded standard pressure value, the comprehensive precision of the pressure sensor and the digital instrument to be detected is in a qualified range, and after verification, executing subsequent ending work.
The subsequent ending work specifically comprises the following steps:
after all data points are verified, the verification department reduces the pressure of the standard pressure source to zero;
standard pressure source for disconnection assay: the calibration department disconnects the standard pressure source for calibration from the calibration port, and the calibration port is sealed by a plug 5;
opening the stop valve 4: and the user of the equipment is connected with a pressure measuring pipeline of the pressure sensor which is verified on the equipment.
Finally, labeling the qualified instruments: the calibration department arranges the recorded calibration data, evaluates various errors of the pressure sensor and the digital instrument to be tested according to the calibration data and the regulation requirements, issues a calibration certificate, provides a calibration qualified mark for the pressure sensor and the digital instrument of the equipment and grants the next calibration period.
In this embodiment, in the process of loading the standard pressure value, the number n of the selected calibration points or calibration points is 8, which sequentially includes:
point 1: a pressure X1, typically 0;
and (2) point: the pressurization pressure point X2, X2 is a certain pressure point specified by the user of the equipment;
and 3, point: the pressurization pressure point X3, X3 is a certain pressure point specified by the user of the equipment;
……
point 8: pressurization X8, typically the pressure sensor maximum range;
the specific calibration process is as follows:
pressing a meter parameter key to enter a digital meter programming mode setting page;
selecting the number of calibration points: n is 8;
selecting a calibration mode: k (setting digital instrument parameter calibration);
against the data of the table above, the following operations were performed on the digital meter:
(1) calibration Point 1
The parameters (i.e. the pressure sensor output voltage value of the detection point 1) are set on the instrument: k1 ═ 0.018;
setting a display value of a calibration point 1 on the instrument; d1 ═ 0.0;
(2) calibration Point 2
The parameters (i.e. the pressure sensor output voltage value of the detection point 2) are set on the meter: k2 ═ 0.983;
setting a display value of a calibration point 2 on the instrument; d2 ═ 100.0;
(3) calibration Point 3
……
(8) Calibration point 8
The parameters (i.e. the pressure sensor output voltage value of the detection point 8) are set on the meter: k8 ═ 9.544;
setting the display value of the calibration point 8 on the instrument; d8 ═ 700.0;
and (5) exiting the digital instrument programming mode setting page by pressing an instrument parameter key, and finishing calibration.
And returning to the verification work, and performing recheck of the calibration effect, wherein the digital instrument display value and the output voltage value of the pressure sensor recorded by the recheck are as follows:
example 3
A pressure sensor online calibration method matched with a digital instrument adopts a virtual instrument of a data acquisition system, and specifically comprises the following steps:
(1) electrifying the data acquisition system: the equipment user transmits power to the equipment, and the data acquisition system is preheated for 30 minutes to reach a stable working state;
(2) and (4) closing the stop valve: the equipment user turns off the pressure measuring pipeline inlet of the pressure sensor to be calibrated on the equipment;
(3) connecting standard pressure sources for assays: the calibration department unscrews the calibration port plug 5 and connects a standard pressure source for calibration to the calibration port of the pressure gauge;
(4) loading a standard pressure value: aiming at the full-range of the pressure sensor, including some pressure points concerned by a device user, selecting a plurality of detection points, and sequentially increasing and decreasing pressure by using a standard pressure source to load standard pressure values;
specifically, in the data acquisition system main menu, a "calibrating" pressure sensor channel page is selected. Taking the range of the pressure sensor as 0-700 KPa and the output voltage as 0-10V as an example, selecting a plurality of detection points in the full range of the pressure sensor, gradually increasing the pressure of the pressure sensor connected with the digital instrument to 700KPa by using a standard pressure source, and then gradually reducing the pressure to 0.
When the voltage is increased to load or the voltage is decreased to each check point, a verification confirmation key is pressed, the data acquisition system stores the virtual instrument pressure display numerical value and the pressure sensor output voltage value of each check point, and finally the points are plotted on a linear degree graph, as shown in fig. 3, the voltage output value corresponding to each check point is consistent with the verification result in the embodiment 2.
(5) And (4) analysis of the verification result: the data acquisition system automatically gives a verification conclusion, if the comprehensive precision linearity chart of the pressure sensor to be verified and the virtual instrument of the data acquisition system is in a qualified range, the detection is finished, and subsequent ending work is executed; if the comprehensive accuracy linearity chart is in an unqualified range, performing pairing calibration work on the pressure sensor and the virtual instrument;
the pairing calibration work specifically comprises the following steps: in the data acquisition system main menu, a "calibrate" pressure sensor channel page is selected. Selecting a plurality of calibration points for the full-range of the pressure sensor, and sequentially boosting and loading standard pressure values by using a standard pressure source; according to the operation specification of the data acquisition system, the pairing calibration work of the pressure sensor and the virtual instrument is carried out, and the method specifically comprises the following steps:
(5.1) selecting a page of a 'calibration' pressure sensor channel in a main menu of the data acquisition system;
(5.2) adjusting the standard pressure for calibration step by step, and saving the pressure sensor output voltage value of the pressure calibration point Bn (n is 1, 2, 3, 4, 5 … … 8) in cooperation with the operation of a calibration page;
(5.3) corresponding to the step (5.2), corresponding display values En (1, 2, 3, 4, 5 … … 8) of calibration points Bn (n is 1, 2, 3, 4, 5 … … 8) of each level are interactively set.
(6) And (5) matching the pressure values of the specified points after calibration, repeating the step (4) and verifying the calibration effect.
More preferably, after each pressure loading, the pressure maintenance is checked: the circuit was confirmed to be leak free and there was no pressure decay at each calibration point.
The subsequent ending work specifically comprises the following steps:
after all data points are verified, the verification department reduces the pressure of the standard pressure source to zero;
standard pressure source for disconnection assay: the calibration department disconnects the standard pressure source for calibration from the calibration port, and the calibration port is sealed by a plug 5;
opening the stop valve 4: and the user of the equipment is connected with a pressure measuring pipeline of the pressure sensor which is verified on the equipment.
Finally, labeling the qualified instruments: the verification department organizes the verification data recorded by the data acquisition system, evaluates various errors of the detected pressure sensor and the virtual instrument according to the verification data and the regulation requirements, issues verification certificates, provides verification qualified marks for the pressure sensor and the virtual instrument of the equipment and grants the next verification period.
In this embodiment, the process of loading the standard pressure value sequentially includes:
point 1: a pressurization X1, which may be 0;
and (2) point: pressurization X2, equipment user designation;
and 3, point: pressurization X3, equipment user designation;
……
point 8: the pressurization X8 may be the maximum range of the pressure sensor.
The specific calibration work is as follows:
in the data acquisition system main menu, a "calibrate" pressure sensor channel page is selected.
A plurality of calibration points are selected for the full range of the pressure sensor. And (4) gradually boosting the pressure of a pressure sensor connected with the gas collection system to 700KPa by using a standard pressure source.
During the boost, the standard pressure source and the "calibration" page are interoperated:
(1) calibration Point 1
Adjusting the standard pressure to be initial 0, and setting a display value of a calibration point 1; e1 ═ 0.0;
when the pressure is stable, pressing the 'confirm' key to read and store the output voltage value of the pressure sensor when the pressure is stable: b1 ═ 0.018;
(2) calibration Point 2
Adjusting the standard pressure to 200KPa, and setting a display value of a calibration point 2; e2 ═ 100.0;
when the pressure is stable, pressing the 'confirm' key to read and store the output voltage value of the pressure sensor when the pressure is stable: b2 ═ 0.983;
(3) calibration Point 3
……
(15) Calibration point 8
Adjusting the standard pressure to 700KPa, and setting a display value of a calibration point 8; e8 ═ 700.0;
when the pressure is stable, pressing the 'confirm' key to read and store the output voltage value of the pressure sensor when the pressure is stable: b8 ═ 9.544;
and after the calibration is finished, returning to the verification work, and performing rechecking of the calibration effect.
Claims (10)
1. The pressure sensor on-line calibration device matched with the digital instrument is characterized by comprising a three-way pipeline, a stop valve (4) and a calibration port, wherein the three-way pipeline comprises an inlet pipeline (1), an outlet pipeline (2) and a bypass pipeline (3);
the stop valve (4) is arranged on the inlet pipeline (1), and the inlet pipeline (1) is communicated with a pressure measuring pipeline of the equipment;
the outlet pipeline (2) is used for being connected with the pressure sensor;
and the calibration port is arranged on the outlet of the bypass pipeline (3) and is used for being connected with a standard pressure source.
2. The on-line calibration device for the pressure sensor of the matched digital instrument according to claim 1, wherein a plug (5) is installed on the calibration port.
3. The on-line calibration device for the pressure sensor of the digital instrument as claimed in claim 1, wherein the standard pressure source is a gas piston type pressure gauge.
4. A pressure sensor online calibration method matched with a digital instrument is characterized in that the pressure sensor online calibration method matched with the digital instrument is used for detection according to any one of claims 1 to 3, and the method specifically comprises the following steps:
s1, communicating the inlet pipeline (1) with a pressure measuring pipeline of the equipment, and electrifying and preheating the pressure sensor and the digital instrument;
s2, closing the stop valve (4);
s3, connecting a standard pressure source to the calibration port;
s4, the pressure sensor and the matched digital instrument are verified: loading a standard pressure value by using a standard pressure source, and recording the loaded standard pressure value, a display value of a digital instrument and the output voltage or current value of a pressure sensor;
s5, if the comprehensive precision of the pressure sensor to be detected and the matched digital instrument is in the qualified range, the detection is finished;
if the comprehensive precision of the pressure sensor to be verified and the matched digital instrument is in the unqualified range, performing pairing calibration on the pressure sensor and the matched digital instrument;
and S6, repeating the step S4 after the calibration is finished, and verifying the comprehensive accuracy of the calibrated pressure sensor and the matched digital instrument again.
5. The on-line calibration method for the pressure sensor of the matched digital instrument according to claim 4, wherein in the step S4, the process of loading the standard pressure value specifically comprises the following steps: a plurality of detection points are selected according to the full-range of the pressure sensor, a standard pressure source is used for sequentially increasing the pressure and loading standard pressure values, and then the pressure is sequentially reduced and loading the standard pressure values.
6. The method of claim 5, wherein the verification points comprise pressure points required to be detected by a user of the device.
7. The on-line calibration method for the pressure sensor of the matched digital instrument as claimed in claim 4, wherein in the step S4, the recorded data is specifically: and recording the digital instrument pressure display value and the digital multimeter verification data of each verification point on a data table.
8. The method for on-line calibration of a pressure sensor of a digital instrument as claimed in claim 4, wherein in step S5, the procedure of the pairing calibration is divided into 2 types according to the signal receiving mode of the digital instrument:
(1) calibration with standard pressure source pressure: sequentially increasing or decreasing the pressure and loading standard pressure values, and setting a corresponding display value of the digital instrument as a loaded standard pressure indicating value in a matching manner;
(2) calibration with set digital meter parameters of the output voltage or current values of the pressure sensor: and averaging the multiple detection values of the output voltage or current of the pressure sensor of the same detection point recorded in the detection process, and configuring the corresponding relation between the voltage or current detection values and the standard loading pressure displayed by the instrument on the digital instrument from low to high or from high to low in sequence.
9. The on-line calibration method for the pressure sensor of the matched digital instrument according to claim 4, wherein after the standard pressure value is loaded each time, the pressure maintaining condition is checked, and the method specifically comprises the following steps: the circuit was confirmed to be leak free and there was no pressure decay at each setpoint.
10. The on-line calibration method for the pressure sensor of the matched digital instrument is characterized in that after the calibration is finished, the pressure of the standard pressure source is reduced to zero, the standard pressure source is disconnected, and the stop valve (4) is opened.
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Application publication date: 20201009 |