CN114354061A - Online calibration method for vacuum furnace pressure gauge - Google Patents
Online calibration method for vacuum furnace pressure gauge Download PDFInfo
- Publication number
- CN114354061A CN114354061A CN202111275576.5A CN202111275576A CN114354061A CN 114354061 A CN114354061 A CN 114354061A CN 202111275576 A CN202111275576 A CN 202111275576A CN 114354061 A CN114354061 A CN 114354061A
- Authority
- CN
- China
- Prior art keywords
- pressure
- pressure gauge
- detected
- vacuum furnace
- standard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000012545 processing Methods 0.000 claims abstract description 33
- 238000009530 blood pressure measurement Methods 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 9
- 238000005259 measurement Methods 0.000 abstract description 10
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The invention belongs to the technical field of measurement and calibration of a pressure gauge and a pressure transmitter of a vacuum furnace, and particularly relates to an online calibration method of the pressure gauge and the pressure transmitter of the vacuum furnace, which is characterized in that a standard digital pressure gauge module is arranged on the vacuum furnace close to the pressure gauge to be detected and the pressure transmitter, after a system is stabilized, the online calibration of the pressure gauge to be detected is completed by comparing the indication value of the pressure gauge to be detected with the pressure value of the standard digital pressure gauge module, on one hand, the frequent disassembly and assembly of the pressure gauge to be detected can be avoided, the difficulty of the pressure gauge to be detected can be reduced, the tightness of the vacuum furnace can be ensured not to be damaged, the shutdown time of the vacuum furnace can be shortened, and the working efficiency can be improved; on the other hand, the calibration result can be directly obtained through the computer data processing system, the calibration time is short, the calibration difficulty is reduced, and the working efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of measurement and calibration of a vacuum furnace pressure gauge, and particularly relates to an online calibration method of the vacuum furnace pressure gauge.
Background
At present, the vacuum furnace pressure gauge can cause the indicating value to appear the error because of various reasons in long-time use, can cause like this to the erroneous judgement of vacuum furnace internal pressure when actual operation to reduce work efficiency, cause the damage of vacuum furnace and even cause the loss of lives and property.
When the pressure gauge of the vacuum furnace is calibrated, the pressure gauge to be detected is usually required to be disassembled and then sent to a laboratory with verification qualification for calibration, so that the disassembly and the assembly of the pressure gauge take long time, and the calibration difficulty is increased; the calibration time is long, so that the vacuum furnace is stopped to reduce the working efficiency; frequent disassembly and assembly can reduce the sealing performance of the vacuum furnace, damage the air tightness of the vacuum furnace and reduce the yield of products.
Disclosure of Invention
The invention aims to provide an online calibration method for a vacuum furnace pressure gauge, which solves the problems that the calibration of the vacuum furnace pressure gauge in the prior art wastes time and labor and reduces the working efficiency.
The technical scheme for achieving the aim comprises the following steps: an online calibration method for a vacuum furnace pressure gauge is characterized by comprising the following steps:
1) installing a standard digital pressure gauge module on the vacuum furnace, so that the air pressure at the position where the standard digital pressure gauge module is installed on the vacuum furnace is the same as the air pressure at the position to be detected on the vacuum furnace, displaying the indicating value by the standard digital pressure gauge module through a signal acquisition and display device, and uploading the indicating value to a computer data processing system for processing;
2) uniformly selecting a plurality of pressure measurement points in the pressure variation range in the vacuum furnace, controlling the pressure in the vacuum furnace by a vacuum furnace pressure control system, and respectively reading the indication value P of the pressure measurement point corresponding to the pressure gauge to be detected when the pressure in the vacuum furnace is reduced to one of the pressure measurement points in the process of reducing the pressureIs to be detectedAnd the indication value P of the standard digital pressure gauge moduleStandard feederAt this time PIs to be detectedAnd PStandard feederAre all process pressure values;
3) the computer data processing system passes through the formula delta PError correction＝PIs to be detected-PStandard feederCalculating the error of the process pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
4) in accordance withAccording to the rest pressure measuring points in 2), respectively reading the indicating value P of the pressure gauge to be detected corresponding to the pressure measuring point when the pressure measuring point is reached each time in the boosting process of the vacuum furnaceTo be examinedAnd the indication value P of the standard digital pressure gauge moduleStandard loopAt this time PTo be examinedAnd PStandard loopAre all return pressure values;
5) the computer data processing system passes through the formula delta PError recovery＝PTo be examined-PStandard loopCalculating the error of the return pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
6) p corresponding to pressure gauge to be detected at the same pressure measurement pointIs to be detectedAnd PTo be examinedRespectively substituted into the formula Δ HReturn difference＝PIs to be detected-PTo be examinedObtaining return differences of a plurality of pressure gauges to be detected through a computer data processing system;
7) repeating steps 2) to 6) at least 2 times;
8) determination of Δ PError correction、ΔPError recoveryAnd Δ HReturn differenceAnd whether the allowable error and the allowable return difference are met, if so, the pressure gauge to be detected is qualified, and if not, the pressure gauge to be detected is unqualified.
Further limiting, the standard digital pressure gauge modules in the step 1) are HB8600 (-100) kPa and HB8600F1 (00-600) kPa.
And further limiting, the indicating value of the pressure gauge to be detected is input into a computer data processing system through an operator, and the indicating value of the standard digital pressure gauge module is converted into a pressure signal corresponding to the indicating value through an output 4-20mA current signal and then is transmitted into the computer data processing system through a signal acquisition and display device.
Further, the number of the pressure measuring points selected in the pressure range of the vacuum furnace is 5.
The invention has the beneficial effects that:
1. the standard digital pressure gauge module is arranged on the vacuum furnace close to the pressure gauge to be detected, so that on one hand, frequent disassembly and assembly of the pressure gauge to be detected can be avoided, the difficulty of the pressure gauge to be detected can be reduced, the tightness of the vacuum furnace can be guaranteed not to be damaged, the downtime of the vacuum furnace can be shortened, and the working efficiency can be improved; on the other hand, the calibration result can be directly obtained through the computer data processing system, the calibration time is short, the calibration difficulty is reduced, and the working efficiency is improved.
2. The pressure gauge on the vacuum furnace can be effectively calibrated for a long time by replacing the standard digital pressure gauge module, the calibration result is high in accuracy, the operation method is convenient and fast, time and labor are saved, and the vacuum furnace can stably work.
Detailed Description
An online calibration method for a vacuum furnace pressure gauge comprises the following steps:
1) installing a standard digital pressure gauge module on a vacuum furnace, enabling the air pressure at the position where the standard digital pressure gauge module is installed on the vacuum furnace to be the same as the air pressure at the position where the pressure to be detected on the vacuum furnace, enabling the model numbers HB8600 (-100) kPa and HB8600F1 (00-600) kPa of the standard digital pressure gauge module, converting the indicating value of the standard digital pressure gauge module into a pressure signal corresponding to the indicating value through an output 4-20mA current signal, and then transmitting the pressure signal into a computer data processing system through a signal acquisition and display device;
2) selecting a plurality of pressure measurement points in the pressure variation range in the vacuum furnace, controlling the pressure in the vacuum furnace through a pressure control system, and respectively reading the indication value P of the pressure measurement point corresponding to the pressure gauge to be detected when the pressure in the vacuum furnace is reduced to one of the pressure measurement points in the process of reducing the pressureIs to be detectedAnd the indication value P of the standard digital pressure gauge moduleStandard feeder，PIs to be detectedAnd PStandard feederAre all course pressure values, P each timeStandard feederDirectly transmitting into computer data processing system, and P corresponding to the computer data processing systemIs to be detectedManually inputting the data into a computer data processing system by an operator to wait for subsequent processing;
3) the computer data processing system passes through the formula delta PError correction＝PIs to be detected-PStandard feederCalculating the error of the process pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
4) according to a plurality of pressure measurements in step 2)Measuring point, respectively reading the corresponding indication value P of the pressure gauge to be detected when the pressure measuring point is reached every time in the boosting process of the vacuum furnaceTo be examinedAnd the indication value P of the standard digital pressure gauge moduleStandard loop，PTo be examinedAnd PStandard loopAre all return pressure values, for the same reason, P each timeStandard loopDirectly transmitting into computer data processing system, and P corresponding to the computer data processing systemTo be examinedManually inputting the data into a computer data processing system by an operator to wait for subsequent processing;
5) the computer data processing system passes through the formula delta PError recovery＝PTo be examined-PStandard loopCalculating the error of the return pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
6) p corresponding to pressure gauge to be detected at the same pressure measurement pointIs to be detectedAnd PTo be examinedRespectively substituted into the formula Δ HReturn difference＝PIs to be detected-PTo be examinedObtaining return differences of a plurality of pressure gauges to be detected through a computer data processing system;
7) repeating the steps 2) -6) for at least 2 times, ensuring more accurate results and reducing errors to the maximum extent;
8) determination of Δ PError correction、ΔPError recoveryAnd Δ HReturn differenceAnd whether the allowable error and the allowable return difference are met, if so, the pressure gauge to be detected is qualified, and if not, the pressure gauge to be detected is unqualified and the calibration is finished.
Example 1
Specifically, the vacuum furnace is communicated with a vacuum furnace pressure source through a pressure control system, and the pressure control system controls the pressure inside the vacuum furnace; wait to examine the manometer and install the furnace position at the vacuum furnace for monitor the furnace pressure of vacuum furnace, standard digital pressure gauge module is installed the position at furnace equally as standard manometer for pressure with waiting to examine the manometer control is unanimous, and the indicating value of standard digital pressure gauge module is as the contrast group of waiting to examine the manometer indicating value.
Since the pressure gauge to be tested usually has a measurement range of (-0.1 to 0.3) MPa and an accuracy of 1.0%, the allowable error thereof is ± 1% × (P) by calculationUpper limit of-POff-line) ± ± 0.004MPa to ± 0.0% (× 0.4MPa), and the allowable size of the backlash is 0.004MPa to an absolute value of an allowable error, in which: pUpper limit ofFor the upper limit pressure value, P, of the pressure gauge to be checkedOff-lineThe lower limit pressure value of the pressure gauge to be detected is obtained.
The tolerance error of the pressure gauge to be detected is as follows: ± 0.004MPa to ± (1.0% × 0.4 MPa);
according to the measurement requirement, the allowable error of the standard digital pressure gauge module is one fourth of the allowable error of the pressure gauge to be detected, the accuracy of the standard digital pressure gauge module is not more than 0.17 percent by calculation, two standard digital pressure gauge modules are selected, the measurement ranges are (-0.1) MPa and (0-0.6) MPa respectively, the accuracy is +/-0.05 percent, and the method meets the requirement, and is specific:
tolerance of standard digital manometer module: 0.004MPa × 1/4 + -0.001 MPa, and 0.17% of standard digital pressure gauge module accuracy + -0.001 MPa/0.6 MPa;
the indicating value of the standard digital pressure gauge module can be converted into a pressure signal corresponding to the indicating value through the output (4-20) mA current signal and then transmitted into a computer data processing system through a signal acquisition and display device, and the signal acquisition and display device can also display the indicating value of the standard digital pressure gauge module.
According to verification regulations JJG52-2013 and JJG882-2019, with reference to the measurement range of a pressure gauge to be detected, selecting 5 pressure measurement points, wherein the uniformly taken points are-0.05, 0, 0.1, 0.2 and 0.3 respectively, and the unit is MPa;
the vacuum furnace reduces the air pressure in the hearth through the pressure control system, and the pressure P at the standard digital pressure gauge module is observed from the signal acquisition and display deviceStandard inlet 1When the pressure in the furnace is 0.3MPa, the indication value P of the pressure gauge to be detected is read when the pressure in the furnace is stableTo be detected 1A 1 is to PTo be detected 1Inputting the two readings into a computer data processing system, and substituting the two readings into a formula delta PError correction＝PIs to be detected-PStandard feederObtaining the error delta P of the process pressure valueError 1＝PTo be detected 1-PStandard inlet 1(ii) a Followed byThe pressure of the rear vacuum furnace is continuously reduced until the pressure P at the standard digital pressure gauge module is observed on the signal acquisition and display deviceStandard inlet 2When the pressure in the furnace is 0.2MPa, the indication value P of the pressure gauge to be detected is read when the pressure in the furnace is stableTo be detected 2A 1 is to PTo be detected 2Inputting the two readings into a computer data processing system, and substituting the two readings into a formula delta PError correction＝PIs to be detected-PStandard feederObtaining the error delta P of the process pressure valueError rate 2＝PTo be detected 2-PStandard inlet 2And the rest of the process pressure value errors delta P are obtained by analogyError correction 3、ΔPError correction 4And Δ PError correction 5。
In the same way, the hearth pressure of the vacuum furnace is increased, and the indication values P of the pressure to be detected corresponding to the 5 pressure measurement points are respectively obtainedIs to be examined for 1、PIs to be examined 2、PIs to be examined for 3、PIs to be examined for 4And PIs to be examined 5By the formula Δ PError recovery＝PTo be examined-PStandard loopCalculating the corresponding error of the return pressure value, delta PError returns to 1、ΔPError return 2、ΔPError return 3、ΔPError correction 4And Δ PThe error is 5.
The computer data processing system then processes the data using the formula Δ HReturn difference＝PIs to be detected-PTo be examinedCalculating 5 sets of corresponding return differences delta H of the pressure gauge to be testedReturn difference 1、ΔHReturn difference 2、ΔHReturn difference 3、ΔHReturn difference 4And Δ HReturn difference 5。
The measurement is repeated at least 2 times, and the error of the measured data is reduced.
Finally, the computer data processing system judges the obtained 5 groups of delta PError correctionAnd 5 groups Δ PError recoveryWhether the pressure is within the allowable error range of the pressure gauge to be detected or not and simultaneously judging delta HReturn differenceIf the error and the return difference are both within the allowable error and the allowable return difference range, the pressure gauge to be detected meets the requirement, and if one of the error and the return difference is not within the range, the pressure gauge to be detected is proved not to meet the requirementAnd (5) completing the calibration work of the vacuum furnace pressure gauge.
If the pressure gauge to be detected does not meet the use requirements, the pressure gauge on the vacuum furnace can be replaced to ensure safe and effective use.
Specifically, the actual measurement is used for illustration, and table 1 and table 2 respectively show experimental data obtained by two times of the vacuum furnace pressure gauge online calibration method:
TABLE 1 first calibration measurement data of vacuum furnace pressure gauge
TABLE 2 vacuum furnace manometer 2 nd time calibration measurement data
Combining the data in tables 1 and 2, the Δ P can be knownError correctionAnd Δ PError recoveryAre all within the allowable error range of the pressure gauge to be detected, and have the same delta HReturn differenceAlso in the allowable return difference range of the pressure gauge to be detected, so that the pressure gauge to be detected meets the requirements.
Claims (4)
1. An online calibration method for a vacuum furnace pressure gauge is characterized by comprising the following steps:
1) installing a standard digital pressure gauge module on the vacuum furnace, so that the air pressure at the position where the standard digital pressure gauge module is installed on the vacuum furnace is the same as the air pressure at the position to be detected on the vacuum furnace, displaying the indicating value by the standard digital pressure gauge module through a signal acquisition and display device, and uploading the indicating value to a computer data processing system for processing;
2) uniformly selecting a plurality of pressure measurement points in the pressure variation range in the vacuum furnaceThe pressure inside the vacuum furnace is controlled by a vacuum furnace pressure control system, and when the vacuum furnace reduces the air pressure, the indication value P of the pressure measurement point corresponding to the pressure gauge to be detected is respectively read when the pressure is changed to one of the pressure measurement pointsIs to be detectedAnd the indication value P of the standard digital pressure gauge moduleStandard feederAt this time PIs to be detectedAnd PStandard feederAre all process pressure values;
3) the computer data processing system passes through the formula delta PError correction＝PIs to be detected-PStandard feederCalculating the error of the process pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
4) according to the rest pressure measuring points in the step 2), respectively reading the indicating values P of the corresponding pressure gauge to be detected when the pressure measuring points are reached each time in the boosting process of the vacuum furnaceTo be examinedAnd the indication value P of the standard digital pressure gauge moduleStandard loopAt this time PTo be examinedAnd PStandard loopAre all return pressure values;
5) the computer data processing system passes through the formula delta PError recovery＝PTo be examined-PStandard loopCalculating the error of the return pressure value between the pressure gauge to be detected and the standard digital pressure gauge module each time;
6) p corresponding to pressure gauge to be detected at the same pressure measurement pointIs to be detectedAnd PTo be examinedRespectively substituted into the formula Δ HReturn difference＝PIs to be detected-PTo be examinedObtaining return differences of a plurality of pressure gauges to be detected through a computer data processing system;
7) repeating steps 2) to 6) at least 2 times;
8) determination of Δ PError correction、ΔPError recoveryAnd Δ HReturn differenceAnd whether the allowable error and the allowable return difference are met, if so, the pressure gauge to be detected is qualified, and if not, the pressure gauge to be detected is unqualified.
2. The method for calibrating the pressure gauge of the vacuum furnace in the online manner according to claim 1, wherein the standard digital pressure gauge modules in the step 1) are respectively provided with model numbers HB8600 (-100) kPa and HB8600F1 (00-600) kPa.
3. The on-line calibration method for the pressure gauge of the vacuum furnace as claimed in claim 2, wherein the indication value of the pressure gauge to be tested is input into the computer data processing system by an operator, and the indication value of the standard digital pressure gauge module is converted into a pressure signal corresponding to the indication value through an output 4-20mA current signal and then is transmitted into the computer data processing system through the signal acquisition and display device.
4. The method for calibrating the pressure gauge of the vacuum furnace in the online manner according to the claims 1 to 3, wherein the number of the pressure measurement points selected in the pressure range of the vacuum furnace is 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275576.5A CN114354061A (en) | 2021-10-29 | 2021-10-29 | Online calibration method for vacuum furnace pressure gauge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111275576.5A CN114354061A (en) | 2021-10-29 | 2021-10-29 | Online calibration method for vacuum furnace pressure gauge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114354061A true CN114354061A (en) | 2022-04-15 |
Family
ID=81095863
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111275576.5A Pending CN114354061A (en) | 2021-10-29 | 2021-10-29 | Online calibration method for vacuum furnace pressure gauge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114354061A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116448315A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Online detection method for pressure gauge |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100107723A1 (en) * | 2006-11-09 | 2010-05-06 | Abbott Medical Optics Inc. | Calibration Utility for Non-Linear Measurement System |
| CN106959189A (en) * | 2017-04-27 | 2017-07-18 | 沈阳飞机工业（集团）有限公司 | A kind of vacuum meter on-line calibration device and application method |
| CN110864847A (en) * | 2018-08-27 | 2020-03-06 | 成都飞机工业（集团）有限责任公司 | Calibration method of pump station pressure gauge for cold extrusion process |
| CN214373114U (en) * | 2021-03-05 | 2021-10-08 | 无锡微泰传感封测技术有限公司 | Online calibrating machine for automobile pressure sensor |
-
2021
- 2021-10-29 CN CN202111275576.5A patent/CN114354061A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100107723A1 (en) * | 2006-11-09 | 2010-05-06 | Abbott Medical Optics Inc. | Calibration Utility for Non-Linear Measurement System |
| CN106959189A (en) * | 2017-04-27 | 2017-07-18 | 沈阳飞机工业（集团）有限公司 | A kind of vacuum meter on-line calibration device and application method |
| CN110864847A (en) * | 2018-08-27 | 2020-03-06 | 成都飞机工业（集团）有限责任公司 | Calibration method of pump station pressure gauge for cold extrusion process |
| CN214373114U (en) * | 2021-03-05 | 2021-10-08 | 无锡微泰传感封测技术有限公司 | Online calibrating machine for automobile pressure sensor |
Non-Patent Citations (2)
| Title |
|---|
| 卡比拉;: "在用压力表的定期检验探析", 科技传播, no. 16, 23 August 2013 (2013-08-23), pages 218 * |
| 沈平平 等: "便携式压力变送器检定***的设计", 实验科学与技术, vol. 11, no. 01, 28 February 2013 (2013-02-28), pages 23 - 25 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116448315A (en) * | 2023-06-12 | 2023-07-18 | 乐山市计量测试所 | Online detection method for pressure gauge |
| CN116448315B (en) * | 2023-06-12 | 2023-08-29 | 乐山市计量测试所 | Online detection method for pressure gauge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201993202U (en) | Calibrating device for pressure sensor or transmitter | |
| CN108195447B (en) | Flowmeter calibration system and calibration method | |
| CN211317615U (en) | Full-automatic pressure verification instrument | |
| CN101763096A (en) | Automatic calibrating and testing system and calibrating and testing method thereof | |
| CN114354061A (en) | Online calibration method for vacuum furnace pressure gauge | |
| CN112484916B (en) | Temperature response characteristic calibration method for patch type pressure sensor | |
| CN112556926A (en) | Automatic detection device and detection method for static pressure performance of differential pressure transmitter | |
| CN116625575A (en) | Pressure scanning valve on-site calibration system and method thereof | |
| CN113447234A (en) | Wind tunnel electronic pressure scanning valve traceability device and traceability method thereof | |
| CN110836699A (en) | Internet of things temperature and pressure compensation diaphragm meter suitable for high-altitude area and compensation method | |
| CN116296414A (en) | Dynamic measurement system and method for on-line calibration and compensation | |
| CN207991747U (en) | A kind of full-automatic pressure sensor batch detection calibration console | |
| CN111751048A (en) | Pressure sensor online checking device and method matched with digital instrument | |
| CN108240889B (en) | Device and method for calibrating high static pressure differential pressure device | |
| CN210036906U (en) | Negative pressure source device and gas meter verification gas circuit system | |
| CN109974932B (en) | Instrument static pressure correction system and method | |
| CN219015429U (en) | Mass flowmeter calibrating device | |
| CN108839975B (en) | Method for detecting performance of oil pump at bottom of oil storage tank | |
| CN104374438A (en) | Gas flow detection device and method for light gas turbine combustion chamber nozzle | |
| CN112255138B (en) | Inspection and maintenance method for special fire extinguishing agent concentration measurement system | |
| CN113021077A (en) | Precision calibration method for on-machine measurement system of numerical control machine tool | |
| CN110243444B (en) | Negative pressure source device, gas meter verification gas circuit system and verification method | |
| CN209432347U (en) | A kind of flow type micro-pressure sensor calibration equipment | |
| CN112710440A (en) | Air detection machine leakage detection method with temperature compensation | |
| CN219434183U (en) | Air flowmeter detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |