CN105549639B - A method of the pressure vessel ancillary equipment control based on PLC control - Google Patents
A method of the pressure vessel ancillary equipment control based on PLC control Download PDFInfo
- Publication number
- CN105549639B CN105549639B CN201510905779.6A CN201510905779A CN105549639B CN 105549639 B CN105549639 B CN 105549639B CN 201510905779 A CN201510905779 A CN 201510905779A CN 105549639 B CN105549639 B CN 105549639B
- Authority
- CN
- China
- Prior art keywords
- pressure
- plc
- value
- analog quantity
- module
- 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.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000009466 transformation Effects 0.000 claims abstract description 12
- 238000004364 calculation method Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 238000005259 measurement Methods 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 5
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 5
- 241000282693 Cercopithecidae Species 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000004088 simulation Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims 1
- 230000037431 insertion Effects 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- 238000009530 blood pressure measurement Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000011017 operating method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D16/00—Control of fluid pressure
- G05D16/20—Control of fluid pressure characterised by the use of electric means
- G05D16/2006—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means
- G05D16/208—Control of fluid pressure characterised by the use of electric means with direct action of electric energy on controlling means using a combination of controlling means as defined in G05D16/2013 and G05D16/2066
Landscapes
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
The present invention relates to technical field of electric power more particularly to a kind of methods of the pressure vessel ancillary equipment control based on PLC control.Increase new-style electronic pressure sensor specifically in the measuring cell of pressure vessel, using debugging computer with PLC is online checks present day analog measuring value, according to calculation formula P=L*(Px-4000)/digital signal is scaled practical measured value by (20000-4000), adjust the correcting button of pressure sensor A, keep measured pressure value close to actual pressure value, up to error concealment or within the allowable range, transformation control logic is added by equipment setting value of pressure requirement in a program, compiler is simultaneously downloaded, on-line testing is carried out after new procedures application, confirm errorless backed off after random.Stability of the present invention is high, easily realizes, it is convenient to operate, and effectively improves sensitivity, accuracy and the control ability to ancillary equipment of control pressure, runs relatively reliable, safety, reduces the harm to the person and equipment.
Description
Technical field
The present invention relates to technical field of electric power more particularly to a kind of pressure vessel ancillary equipment controls based on PLC control
Method.For carrying out centralized control, zero load, the load switching of high pressure oil gas tank auxiliary device using PLC；Pressure aqueous vapor tank is inflated
And the start-up and shut-down control of tonifying Qi ancillary equipment；And the start and stop of ancillary equipment that are controlled by pressure of other pressure vessels or transformation etc..
Background technique
At present in the control mode for controlling pressure vessel ancillary equipment using pressure value, mechanical compression is generallyd use
Switch is used as pressure monitoring signal, when pressure meets the setting value of pressure switch, is connected after contact above and below pressure switch
Circuit send signal to control PLC, controls the start and stop or transformation of corresponding ancillary equipment.
This control mode is more single, the control to equipment is completed by simple mechanical type contact, there are many
Hidden danger and control ability is poor, for long operational time and the frequent equipment of pressure oscillation, this control mode can not
The accuracy for guaranteeing pressure seriously threatens the person and equipment safety.It is common using this control mode of mechanical pressure switch
The problem of mainly have the following:
1, mechanical pressure switch will lead to setting value drift due to long term frequent use, influence the accuracy of pressure.
2, due to the influence of ambient enviroment cause mechanical contact can not reliable contacts, influence equipment reliability of operation.
3, mechanical pressure switch due to itself fault of construction and lead to contact card plug, seriously affect the person and equipment
Safety etc..
This to use mechanical pressure switch as this control mode of pressure monitoring signal, structure is simple, poor reliability,
With the passage of runing time and the influence of surrounding enviroment, the accuracy of pressure not can guarantee, or even can jeopardize the person and set
Standby safety.
Summary of the invention
To overcome above-mentioned defect existing in the prior art, it is auxiliary that the present invention provides a kind of pressure vessel based on PLC control
The method for helping equipment to control.Its purpose is to prevent the generation of above situation, and provide a kind of using novel electron pressure
Sensor as pressure measurement signal, and in PLC program be added measured value and setting value CL Compare Logic, the logic output knot
Fruit and mechanical pressure switch signal form combined type logic control, and electronic pressure transmitter can effectively improve control pressure
Accuracy, double logic controls then can effectively guarantee equipment reliability of operation, reduce the harm to the person and equipment.
In order to achieve the above objectives, the technical scheme adopted by the invention is that:
A method of the pressure vessel ancillary equipment control based on PLC control, specific steps are as follows:
Increase electronic pressure sensor in the measuring cell of pressure vessel, electronic pressure sensor power supply is positive (+)
+ 24V the terminal of PLC analog quantity module B is accessed, electronic pressure sensor power supply negative (-) accesses the S of PLC analog quantity module B
(+) terminal, S (-) terminal of PLC analog quantity module B and the 0V terminal of PLC analog quantity module B are shorted；Using debugging computer with
PLC is online to check present day analog measuring value, according to calculation formula P=L*(Px-4000)/(20000-4000) change digital signal
Calculating is practical measured value, adjusts the correcting button of electronic pressure sensor, keeps measured pressure value close to actual pressure value, until
Error concealment or within the allowable range requires that transformation control logic is added according to equipment setting value of pressure in a program, compiles journey
Sequence is simultaneously downloaded, and is carried out on-line testing after new procedures application, is confirmed errorless backed off after random.
It is described specific steps are as follows:
(1) preparation tool:
Output 4-20mA electronic pressure sensor one, the monkey wrench of bore 30mm two, multi-function multimeter one
A, one, a word length bar screwdriver, one, cross stock screwdriver, band is several；
(2) it installs:
Bolt on electronic pressure sensor pedestal is removed, the suitable installation site in aperture, bottom are chosen on bracket
Seat is downwardly into electronic pressure sensor, and bolt is returned dress, fixed sensor；PLC analog input mould is measured with multimeter
The positive and negative pole tension of block, is confirmed as 24V, by+24V the terminal of positive (+) the access PLC analog quantity module B of sensors A power supply, electronics
Formula pressure sensor power supply negative (-) access PLC analog quantity module B S (+) terminal, S (-) terminal of PLC analog quantity module B with
The 0V terminal of PLC analog quantity module B is shorted；
(3) simulation measuring value conversion calculated with actual values formula:
Electronic pressure sensor output is 4-20mA current mode analog quantity, is equipped with A/D converter inside PLC module, can
The digital quantity that the analog quantity is converted to 4000-20000 utilizes following conversion formula you can get it actual pressure value:
P=L*(Px-4000)/(20000-4000) (1-1)；
Parameter is described as follows:
P: the measured pressure value after converting；
L: sensor measurement range；
Px: the digital quantity that analog quantity is exported through A/D converter；
4000: analog quantity lower bound 4mA corresponding digital quantity；
20000: analog quantity height limits the corresponding digital quantity of 20mA；
The actual value that pressure can be calculated according to above-mentioned formula, in addition if analog quantity crosses the limitation of 4-20mA, or
It is the limitation that digital quantity crosses 4000-20000, has numerical value and show, but does not have practical significance；
(4) accuracy correction:
Contemporary Digital measuring value Px is checked in PLC module, and is calculated using formula (1-1), by the pressure value of calculating
It is compared with actual pressure, calculates error, adjust the trim button of sensor, lean on measured pressure value to actual pressure value
Closely, up to error concealment or within the allowable range；
(5) logic Modification:
Numerical value comparison module is introduced in PLC control program, and makees following modification:
Module GE: greater than be equal to logic, A port value be more than or equal to C port value when, Q is connected to the right；
OK: module enable end, module works after the conducting of left end；
P: the pressure measured value that converted formula (1-1) is calculated；
X: pressure set points；
I001: mechanical pressure switch signal；
Q001 [S]: control ancillary equipment start and stop or transformation；
Pressure measured value is compared with setting value, output result and pressure switch signal collective effect are in control equipment
Start and stop or transformation, two kinds of control modes combine to form complex controll；
(6) compiling downloading debugging:
Software is online with PLC, the program modified is compiled, is downloaded to PLC after compiling successfully, PLC is restarted and answers
It with new program, is debugged online, confirms backed off after random without exception.
Advantages of the present invention and application effect are:
Using novel electronic pressure transmitter, as pressure measurement signal, and in PLC program, addition measures the present invention
The CL Compare Logic of value and setting value, the logic output result and mechanical pressure switch signal form combined type logic control, electricity
Sub- pressure sensor output analog quantity can effectively improve the sensitivity and accuracy of control pressure after the conversion of A/D module.
It combines to form complex controll logic with mechanical pressure switch, which then can greatly improve to ancillary equipment
Control ability, it is effective to guarantee to make that pressure vessel operation is relatively reliable, safety, reduce the harm to the person and equipment.
Control mode stability of the present invention is high, and is based on PLC centralized control, easy to accomplish, and it is convenient to operate, for modern work
Industry is easily generalized to the field of the ancillary equipments such as control flow, temperature, liquid level, has very strong applicability.
The present invention will be further described in detail in the following with reference to the drawings and specific embodiments.
Detailed description of the invention
Fig. 1 is present system schematic diagram；
Fig. 2 is hardware structure diagram of the present invention；
Fig. 3 is logic Modification figure of the present invention；
Fig. 4 is that the present invention implements operating procedure block diagram.
Specific embodiment
The present invention is a kind of method of pressure vessel ancillary equipment control based on PLC control.As Figure 1-Figure 4, exist
Increase new-style electronic pressure sensor, positive (+) the access PLC analog quantity mould of sensors A power supply in the measuring cell of pressure vessel
+ 24V the terminal of part B, sensors A power supply negative (-) access S (+) terminal of PLC analog quantity module B, the S of PLC analog quantity module B
The 0V terminal of (-) terminal and PLC analog quantity module B are shorted；Using debugging computer with PLC is online checks present day analog measuring value,
Digital signal is scaled practical measured value according to calculation formula (1-1), the correcting button of pressure sensor A is adjusted, presses measurement
Force value is close to actual pressure value, up to error concealment or within the allowable range, wants in a program according to equipment setting value of pressure
Addition transformation control logic is sought, compiler is simultaneously downloaded, and is carried out on-line testing after new procedures application, is confirmed errorless backed off after random.It should
Analog output result and mechanical pressure switch collective effect form good reliability in the control of ancillary equipment, with high accuracy
Complex controll logic, while the setting value of analog quantity can be modified at any time as needed, it is simpler convenient to operate.
In the specific implementation, operating process is as described below by the present invention:
(1) preparation tool:
Output 4-20mA electronic pressure transmitter one, the monkey wrench of bore 30mm two, multi-function multimeter one,
One one, word length bar screwdriver, one, cross stock screwdriver, band is several.
(2) it installs:
Bolt on electronic pressure transmitter pedestal is removed, the suitable installation site in aperture, pedestal are chosen on bracket
It is downwardly into electronic pressure transmitter, bolt is returned into dress, fixed sensor.With multimeter measurement PLC Analog input mModule
Positive and negative pole tension, is confirmed as 24V, by+24V the terminal of positive (+) the access PLC analog quantity module B of sensors A power supply, sensors A electricity
Source negative (-) accesses S (+) terminal of PLC analog quantity module B, S (-) terminal and PLC analog quantity module B of PLC analog quantity module B
0V terminal be shorted.
(3) simulation measuring value conversion calculated with actual values formula:
Sensor output is 4-20mA current mode analog quantity, is equipped with A/D converter inside PLC module, can be by the analog quantity
The digital quantity for being converted to 4000-20000 utilizes following conversion formula you can get it actual pressure value:
P=L*(Px-4000)/(20000-4000) (1-1)；
Parameter is described as follows:
P: the measured pressure value after converting；
L: sensor measurement range；
Px: the digital quantity that analog quantity is exported through A/D converter；
4000: analog quantity lower bound 4mA corresponding digital quantity；
20000: analog quantity height limits the corresponding digital quantity of 20mA.
The actual value that pressure can be calculated according to above-mentioned formula, in addition if analog quantity crosses the limitation of 4-20mA, or
It is the limitation that digital quantity crosses 4000-20000, has numerical value and show, but does not have practical significance.
(4) accuracy correction:
Contemporary Digital measuring value Px is checked in PLC module, and is calculated using formula (1-1), by the pressure value of calculating
It is compared with actual pressure, calculates error, adjust the trim button of sensor, lean on measured pressure value to actual pressure value
Closely, up to error concealment or within the allowable range.
(5) logic Modification:
Numerical value comparison module is introduced in PLC control program, and makees modification as shown in Figure 1.
As shown in figure 3, wherein parameter is described as follows:
Module GE: greater than be equal to logic, when A port value is more than or equal to C port value, Q is connected to the right (can be according to practical control
System needs to select corresponding logic module).
OK: module enable end, module works after the conducting of left end；
P: the pressure measured value that converted formula (1-1) is calculated；
X: pressure set points；
I001: mechanical pressure switch signal；
Q001 [S]: control ancillary equipment start and stop or transformation.
Pressure measured value is compared with setting value, output result and pressure switch signal collective effect are in control equipment
Start and stop or transformation, two kinds of control modes combine to form complex controll, have both improved measurement accuracy while ensure that equipment is run
Reliability.
(6) compiling downloading debugging:
Software is online with PLC, the program modified is compiled, is downloaded to PLC after compiling successfully, PLC is restarted and answers
It with new program, is debugged online, confirms backed off after random without exception.
Claims (1)
1. a kind of method of the pressure vessel ancillary equipment control based on PLC control, it is characterized in that: specific steps are as follows:
Increase electronic pressure sensor, positive (+) access of electronic pressure sensor power supply in the measuring cell of pressure vessel
+ 24V the terminal of PLC analog quantity module B, electronic pressure sensor power supply negative (-) access S (+) end of PLC analog quantity module B
Son, S (-) terminal of PLC analog quantity module B and the 0V terminal of PLC analog quantity module B are shorted；It is online using debugging computer and PLC
Present day analog measuring value is checked, according to calculation formula P=L*(Px-4000)/digital signal is scaled reality by (20000-4000)
Measured value adjusts the correcting button of electronic pressure sensor, keeps measured pressure value close to actual pressure value, until error concealment
Or within the allowable range, it requiring that transformation control logic is added according to equipment setting value of pressure in a program, compiler is simultaneously downloaded,
On-line testing is carried out after new procedures application, confirms errorless backed off after random；
It is described specific steps are as follows:
(1) preparation tool:
Output 4-20mA electronic pressure sensor one, the monkey wrench of bore 30mm two, multi-function multimeter one, one
One, word length bar screwdriver, one, cross stock screwdriver, band is several；
(2) it installs:
Bolt on electronic pressure sensor pedestal is removed, on bracket choose the suitable installation site in aperture, pedestal to
Bolt is returned dress, fixed electronic pressure sensor by lower insertion electronic pressure transmitter；It is defeated with multimeter measurement PLC analog quantity
The positive and negative pole tension for entering module, is confirmed as 24V, by electronic pressure sensor power supply it is positive (+) access PLC analog quantity module B+
24V terminal, electronic pressure sensor power supply negative (-) access S (+) terminal of PLC analog quantity module B, PLC analog quantity module B
S (-) terminal and PLC analog quantity module B 0V terminal be shorted；
(3) simulation measuring value conversion calculated with actual values formula:
Electronic pressure sensor output is 4-20mA current mode analog quantity, and A/D converter is equipped with inside PLC module, can should
Analog quantity is converted to the digital quantity of 4000-20000, utilizes following conversion formula you can get it actual pressure value:
P=L*(Px-4000)/(20000-4000) (1-1)；
Parameter is described as follows:
P: the measured pressure value after converting；
L: sensor measurement range；
Px: the digital quantity that analog quantity is exported through A/D converter；
4000: analog quantity lower bound 4mA corresponding digital quantity；
20000: analog quantity height limits the corresponding digital quantity of 20mA；
The actual value of pressure can be calculated according to above-mentioned formula, in addition if analog quantity crosses the limitation of 4-20mA, or number
Word amount crosses the limitation of 4000-20000, has numerical value and shows, but does not have practical significance；
(4) accuracy correction:
Contemporary Digital measuring value Px is checked in PLC module, and is calculated using formula (1-1), by the pressure value and reality of calculating
Border pressure is compared, and is calculated error, is adjusted the trim button of sensor, keep measured pressure value close to actual pressure value, directly
To error concealment or within the allowable range；
(5) logic Modification:
Numerical value comparison module is introduced in PLC control program, and makees following modification:
Module GE: greater than be equal to logic, A port value be more than or equal to C port value when, Q is connected to the right；
OK: module enable end, module works after the conducting of left end；
P: the pressure measured value that converted formula (1-1) is calculated；
X: pressure set points；
I001: mechanical pressure switch signal；
Q001 [S]: control ancillary equipment start and stop or transformation；
Pressure measured value is compared with setting value, output result and pressure switch signal collective effect are in the start and stop of control equipment
Or transformation, two kinds of control modes combine to form complex controll；
(6) compiling downloading debugging:
Software is online with PLC, the program modified is compiled, is downloaded to PLC after compiling successfully, it is new to restart PLC application
Program, debugged online, confirm backed off after random without exception.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510905779.6A CN105549639B (en) | 2015-12-09 | 2015-12-09 | A method of the pressure vessel ancillary equipment control based on PLC control |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510905779.6A CN105549639B (en) | 2015-12-09 | 2015-12-09 | A method of the pressure vessel ancillary equipment control based on PLC control |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105549639A CN105549639A (en) | 2016-05-04 |
| CN105549639B true CN105549639B (en) | 2019-01-08 |
Family
ID=55828874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510905779.6A Active CN105549639B (en) | 2015-12-09 | 2015-12-09 | A method of the pressure vessel ancillary equipment control based on PLC control |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105549639B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102400123B1 (en) * | 2020-08-21 | 2022-05-19 | 주식회사 지오테크놀로지 | Dispenser and method for precision calculating liquid level in syringe |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642278A (en) * | 1995-01-03 | 1997-06-24 | Hewlett-Packard Co. | Method and apparatus for temperature and pressure compensation of pneumatic manifolds |
| CN1862435A (en) * | 2006-01-12 | 2006-11-15 | 绵阳西磁科技开发公司 | Device and method for controlling atmosphere components and pressure balance in negative pressure container |
| CN202025208U (en) * | 2011-03-29 | 2011-11-02 | 东北石油大学 | On-line measure and control device on pressure vessel |
| CN202735859U (en) * | 2012-08-07 | 2013-02-13 | 苏州中锦电气科技有限公司 | Water pressure automatic regulating device |
| CN202929496U (en) * | 2012-11-26 | 2013-05-08 | 上海电站辅机附件厂有限公司 | Power station auxiliary machine pressure guaranteeing system |
| CH709051A2 (en) * | 2013-12-23 | 2015-06-30 | Taferner Marko | Method and apparatus for flushing channels. |
-
2015
- 2015-12-09 CN CN201510905779.6A patent/CN105549639B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5642278A (en) * | 1995-01-03 | 1997-06-24 | Hewlett-Packard Co. | Method and apparatus for temperature and pressure compensation of pneumatic manifolds |
| CN1862435A (en) * | 2006-01-12 | 2006-11-15 | 绵阳西磁科技开发公司 | Device and method for controlling atmosphere components and pressure balance in negative pressure container |
| CN202025208U (en) * | 2011-03-29 | 2011-11-02 | 东北石油大学 | On-line measure and control device on pressure vessel |
| CN202735859U (en) * | 2012-08-07 | 2013-02-13 | 苏州中锦电气科技有限公司 | Water pressure automatic regulating device |
| CN202929496U (en) * | 2012-11-26 | 2013-05-08 | 上海电站辅机附件厂有限公司 | Power station auxiliary machine pressure guaranteeing system |
| CH709051A2 (en) * | 2013-12-23 | 2015-06-30 | Taferner Marko | Method and apparatus for flushing channels. |
Non-Patent Citations (4)
| Title |
|---|
| PLC多路模拟量输入模块的设计与实现;谢灿华，等;《智能建筑与城市信息》;20121231(第8期);第64-67页 |
| PLC接收模拟量输入信号的通用计算表达式;栾秀春，等;《电气电子教学学报》;20101231;第32卷(第6期);摘要、第81-83页 |
| PLC控制系统模拟量信号的数值整定;卢建洲;《电工技术》;20091231(第6期);第37-38页 |
| PLC模拟量的数值整定方法;吕景泉;《自动化与仪表》;19971231;第12卷(第4期);第56-57页 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105549639A (en) | 2016-05-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113036186B (en) | Fuel cell system and hydrogen system bottle valve fault detection method and device thereof | |
| US10606228B2 (en) | Measurement transducer having a monitoring function | |
| CN105425201A (en) | Metering chip simulation test method used for intelligent electric energy meter software reliability detection | |
| CN105549639B (en) | A method of the pressure vessel ancillary equipment control based on PLC control | |
| CN104568308B (en) | The detection means of pressure sensor, method and system | |
| CN108845563A (en) | A kind of method and system for testing PLC program and PLC monitoring software | |
| WO2014090571A1 (en) | Portable equipment for monitoring and controlling the level of oxygen in reflow oven atmosphere | |
| US9502887B2 (en) | Measuring system having at least one field device with at least one display apparatus as well as method for operating same | |
| US20200183350A1 (en) | Electronic circuit for a field device used in automation technology | |
| CN203606339U (en) | Device for detecting sulfur hexafluoride leakage alarming instrument | |
| EP2981764A1 (en) | In situ probe with improved diagnostics and compensation | |
| CN112557599A (en) | Sensor field correction method | |
| CN107817831A (en) | A kind of method of the pressure vessel auxiliary equipment control based on PLC controls | |
| CN203148660U (en) | Detection system for detecting response time of pneumatic valve | |
| US20130041484A1 (en) | Method and system for acquiring and analyzing control loop feedback | |
| CN203178803U (en) | Pressure regulating testboard | |
| US20210119233A1 (en) | Method for detecting a leak in an energy converter system | |
| US20140048289A1 (en) | Fire pump system and system controller | |
| CN106896793B (en) | Process structured ozone system based on object control | |
| CN111536803B (en) | Precise vacuum atmosphere heat treatment furnace with precise control | |
| CN202727055U (en) | Prepress control system for artificial board production line | |
| CN103306964A (en) | Fault detection device | |
| CN203287078U (en) | Liquid level transmitter and liquid level detecting system | |
| CN102081026A (en) | Portable sulfur hexafluoride (SF6) gas density calibrator | |
| CN203785733U (en) | Boiler drum level soft measurement device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |