CN211626804U - Online calibration device of differential pressure transmitter - Google Patents
Online calibration device of differential pressure transmitter Download PDFInfo
- Publication number
- CN211626804U CN211626804U CN202020490795.XU CN202020490795U CN211626804U CN 211626804 U CN211626804 U CN 211626804U CN 202020490795 U CN202020490795 U CN 202020490795U CN 211626804 U CN211626804 U CN 211626804U
- Authority
- CN
- China
- Prior art keywords
- pressure side
- differential pressure
- connecting pipe
- low
- pressure transmitter
- 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
Images
Landscapes
- Measuring Fluid Pressure (AREA)
Abstract
The utility model provides an online calibration equipment of differential pressure transmitter, including the standard calibration table, standard calibration table high pressure measurement end is equipped with the high pressure side connecting pipe, standard calibration table low pressure measurement end is equipped with the low pressure side connecting pipe, high pressure side connecting pipe and low pressure side connecting pipe are connected with quick union respectively, the quick union of standard calibration table high pressure side is used for connecting the high pressure side blowdown end of treating differential pressure transmitter, the quick union of standard calibration table low pressure side is used for connecting the low pressure side blowdown end of treating differential pressure transmitter, be equipped with hand formula booster pump on the high pressure side connecting pipe. The utility model discloses can realize differential pressure transmitter online check-up, need not demolish differential pressure transmitter, easy operation practices thrift the manpower.
Description
Technical Field
The utility model belongs to the technical field of the differential pressure transmitter check-up, in particular to differential pressure transmitter online calibration equipment.
Background
Differential pressure transmitters are the most common type of weight transmitter used in industrial practice to prevent the medium in the pipe from directly entering the transmitter, and the pressure sensing diaphragm is connected to the transmitter by a fluid filled capillary tube. The device is used for measuring the liquid level, the flow and the pressure of liquid, gas or steam, and then converting the liquid, the flow and the pressure into 4-20 mA DC signals for output, and is widely applied to various industrial automatic control environments, and relates to various industries such as water conservancy and hydropower, railway transportation, intelligent buildings, production automatic control, aerospace, war industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like.
As shown in figure 6, the differential pressure transmitter comprises a high-pressure sewage discharge end, a low-pressure sewage discharge end, a high-pressure measuring end and a low-pressure measuring end, wherein the high-pressure sewage discharge end and the low-pressure measuring end are respectively connected to the upstream end and the downstream end of the throttling device through pipelines, sewage discharge screws are arranged on the high-pressure sewage discharge end and the low-pressure sewage discharge end, and the sewage discharge screws are detached for sewage discharge operation. The pressure of the measured medium is directly acted on the diaphragm (stainless steel or ceramic) of the transducer, so that the diaphragm produces micro-displacement proportional to the pressure of the medium, the resistance value of the sensor is changed, and the change is detected by an electronic circuit and converted to output a standard measuring signal corresponding to the pressure. The diaphragm is deformed and then deflects due to long-time compression of the diaphragm, so that the measuring result is influenced. While the stability period of the transmission period specified by a general manufacturer is mostly within six months (intelligent type may be one year), the so-called stability is the basic absolute error value of the maximum measurement range within the specified period.
The prior problems are that: the differential pressure transmitter has long service life, the stability of the transmitter is reduced, and zero point or range drift occurs, so that the measurement result is deviated from the actual value, the process adjustment is not timely, and a series of problems of unqualified product quality and the like are caused. The existing transmitter calibration device, such as the "static pressure calibration device of differential pressure transmitter" disclosed in chinese patent document CN206974610U, needs to detach the differential pressure transmitter for inspection and calibration, and the device is only suitable for periodic calibration of instruments, but not suitable for online calibration of instruments. Because the differential pressure transmitter is influenced by the working condition at ordinary times, the zero drift of the differential pressure transmitter is easy to occur, if the condition is met every time, the differential pressure transmitter needs to be dismantled for verification, the workload is heavy, and the industrial production is not facilitated.
Disclosure of Invention
In view of the technical problem that the background art exists, the utility model provides an online calibration equipment of differential pressure transmitter can realize the online calibration of differential pressure transmitter, need not demolish differential pressure transmitter, and easy operation practices thrift the manpower.
In order to solve the technical problem, the utility model discloses following technical scheme has been taken and has been realized:
the utility model provides an online calibration equipment of differential pressure transmitter, including the standard calibration table, standard calibration table high pressure measurement end is equipped with the high pressure side connecting pipe, standard calibration table low pressure measurement end is equipped with the low pressure side connecting pipe, high pressure side connecting pipe and low pressure side connecting pipe are connected with quick union respectively, the quick union of standard calibration table high pressure side is used for connecting the high pressure side blowdown end of treating differential pressure transmitter, the quick union of standard calibration table low pressure side is used for connecting the low pressure side blowdown end of treating differential pressure transmitter, be equipped with hand formula booster pump on the high pressure side connecting pipe.
In the preferred scheme, the high-pressure measuring end of the differential pressure transmitter to be calibrated is detachably provided with a blind plate for high-pressure side calibration, and the low-pressure measuring end of the differential pressure transmitter to be calibrated is detachably provided with a blind plate for low-pressure side calibration.
In a preferred scheme, the quick movable joint comprises a connecting column, one end of the connecting column is in threaded connection with a high-pressure side sewage discharge end or a low-pressure side sewage discharge end of the differential pressure transmitter to be calibrated, and a through hole is formed in the axis of the connecting column; the other end of the connecting column is detachably connected with a joint connecting pipe, and the joint connecting pipe is used for being connected with a high-pressure side connecting pipe or a low-pressure side connecting pipe.
In the preferred scheme, joint connecting pipe through joint nut center set up, and joint connecting pipe one end is equipped with the snap ring, the snap ring is located inside the joint nut, the joint nut passes through the screw thread mode with the spliced pole and is connected, the spliced pole terminal surface is equipped with the ring channel, the snap ring is used for inserting the ring channel and sets up.
In a preferred scheme, an elastic gasket is arranged in the annular groove.
In the preferred scheme, the outer walls of the connecting columns and the joint screw caps are provided with torsion extension bars.
This patent can reach following beneficial effect:
under the condition that the differential pressure transmitter is not dismantled, the blowdown screw is dismantled, and then the quick union is installed to realize that standard calibration table is connected with the differential pressure transmitter of treating the school, then provide the pressure differential through hand formula booster pump, connect differential pressure transmitter through the manual operator, utilize the HART agreement to carry out the check-up operation. The differential pressure transmitter can be checked on line, the differential pressure transmitter does not need to be dismounted, the operation is simple, and the manpower is saved.
After the pollution discharge screw is removed, in order to quickly install the calibration device, the design of the quick movable joint is adopted, so that the field installation time is saved.
Drawings
The invention will be further explained with reference to the following figures and examples:
FIG. 1 is a schematic view of the connection in the checking use of the present invention;
FIG. 2 is a three-dimensional structure diagram of the quick movable joint of the present invention;
FIG. 3 is a three-dimensional structure diagram of the connecting column of the present invention;
FIG. 4 is a three-dimensional structure diagram of the joint nut and joint connecting tube of the present invention;
FIG. 5 is a three-dimensional structure diagram of the joint connecting pipe of the present invention;
FIG. 6 is a schematic diagram of the connection of a differential pressure transmitter to be calibrated during use.
In the figure: the device comprises a standard checking meter 1, a quick movable joint 2, a connecting column 21, a through hole 22, a joint connecting pipe 23, a joint screw cap 24, a snap ring 25, an annular groove 26, a torsion extension rod 27, a hand-operated booster pump 3, a blind plate 41 for high-pressure side checking, a blind plate 42 for low-pressure side checking, a differential pressure transmitter 5 to be checked, a primary high-pressure side stop valve 61, a secondary high-pressure side stop valve 62, a primary low-pressure side stop valve 71, a secondary low-pressure side stop valve 72 and a throttling device 8.
Detailed Description
The preferred scheme is as shown in figures 1 to 6, an online verifying attachment of differential pressure transmitter, including standard check table 1, the high-pressure measurement end of standard check table 1 is equipped with the high pressure side connecting pipe, the low pressure measurement end of standard check table 1 is equipped with the low pressure side connecting pipe, high pressure side connecting pipe and low pressure side connecting pipe are connected with quick union 2 respectively, the quick union 2 of the high pressure side of standard check table 1 is used for connecting the high pressure side blowdown end of treating differential pressure transmitter 5, the quick union 2 of the low pressure side of standard check table 1 is used for connecting the low pressure side blowdown end of treating differential pressure transmitter 5, be equipped with hand formula booster pump 3 on the high pressure side connecting pipe.
As shown in fig. 2, the conveying pipeline is used for conveying working condition media, the throttling device is arranged on the conveying pipeline, the differential pressure transmitter is used for measuring differential pressure at the front end and the rear end of the throttling device and can convert the differential pressure into parameters such as flow and the like, the measuring pipeline is divided into a high-pressure side measuring pipeline and a low-pressure side measuring pipeline, the high-pressure side measuring pipeline is provided with a high-pressure side primary stop valve 61 and a high-pressure side secondary stop valve 62, and the low-pressure side measuring pipeline is provided with a low-pressure side primary stop valve 71 and. The blowdown end of the existing differential pressure transmitter is used for emptying, so that the high-pressure measuring end and the low-pressure measuring end of the differential pressure transmitter are communicated with the atmosphere, the pressure on two sides of the differential pressure transmitter is open to the atmosphere, and under the normal condition, when the two ends of the differential pressure transmitter are empty, the differential pressure transmitter should display '0', namely, no differential pressure exists. However, when a zero point offset occurs, the differential pressure transmitter indicates that the value is not "0". The diaphragm is deformed and then shifts due to long-time compression of the diaphragm, and a measurement result is influenced, so that the differential pressure transmitter cannot reflect the differential pressure of normal working conditions. At this point, the differential pressure transmitter needs to be calibrated.
In the technical scheme, the adopted verification mode is as follows: under the condition that differential pressure transmitter is not dismantled, demolish the blowdown screw, then install quick union 2 to realize that standard calibration table 1 is connected with the differential pressure transmitter 5 of treating proofreading, then provide pressure differential through hand formula booster pump 3, connect differential pressure transmitter through the manual operator, utilize the HART agreement to carry out the check-up operation.
Further, a high-pressure measuring end of the differential pressure transmitter 5 to be calibrated is detachably provided with a blind plate 41 for high-pressure side calibration, and a low-pressure measuring end of the differential pressure transmitter 5 to be calibrated is detachably provided with a blind plate 42 for low-pressure side calibration. The high-pressure side check blind plate 41 and the low-pressure side check blind plate 42 mainly play a role in isolation in the check process, and the leakage of the high-pressure side primary stop valve 61, the high-pressure side secondary stop valve 62, the low-pressure side primary stop valve 71 and the low-pressure side secondary stop valve 72 on the measuring pipeline, which causes inaccurate check, is avoided.
Furthermore, the quick movable joint 2 comprises a connecting column 21, one end of the connecting column 21 is in threaded connection with a high-pressure side sewage discharge end or a low-pressure side sewage discharge end of the differential pressure transmitter 5 to be calibrated, and a through hole 22 is formed in the axis of the connecting column 21; the other end of the connection column 21 is detachably connected to a joint connection pipe 23, and the joint connection pipe 23 is used for being connected to a high pressure side connection pipe or a low pressure side connection pipe. After the pollution discharge screw is removed, the design of the quick movable joint 2 is adopted for quickly installing the calibration device, so that the field installation time is saved.
The joint connecting pipe 23 is fixedly connected with the high-pressure side connecting pipe or the low-pressure side connecting pipe in advance through the ferrule type pipe joint, the preferred hand-operated booster pump 3 is connected with the standard calibration table 1 in advance, and the manual-operated booster pump is not required to be frequently disassembled after being used, so that the current calibration time can be saved. The ferrule type pipe joint is a commonly used connecting piece for a measuring pipeline.
Further, joint connecting pipe 23 runs through joint nut 24 center setting, and joint connecting pipe 23 one end is equipped with snap ring 25, and snap ring 25 is located inside joint nut 24, and joint nut 24 is connected through the screw thread mode with spliced pole 21, and spliced pole 21 terminal surface is equipped with ring channel 26, and snap ring 25 is used for inserting the setting in ring channel 26. When the joint nut 24 is rotated, the joint coupling tube 23 is not rotated, and when the joint nut 24 is completely tightened, the snap ring 25 is completely inserted into the annular groove 26, so that the joint coupling tube 23 is coupled to the coupling post 21.
Further, an elastic gasket is provided in the annular groove 26. The elastic gasket can improve the sealing effect.
Furthermore, the outer walls of the connecting column 21 and the joint nut 24 are provided with torsion extension bars 27. The torsion extension bar 27 can be quickly disassembled without frequent disassembly by a wrench, and the field assembly time is further shortened.
The working principle of the whole device is as follows:
before checking, the standard checking table 1, the hand-operated booster pump 3 and the quick movable joint 2 are confirmed to be connected. And closing the high-pressure side primary stop valve 61, the high-pressure side secondary stop valve 62, the low-pressure side primary stop valve 71 and the low-pressure side secondary stop valve 72, installing the high-pressure side check blind plate 41 and the low-pressure side check blind plate 42, removing the sewage discharge screw of the differential pressure transmitter 5 to be checked, and connecting the two quick movable joints 2.
After the connection is finished, the high-pressure side connecting pipe is pressurized by using the hand-operated booster pump 3, indication values of the standard calibration table 1 and the differential pressure transmitter 5 to be calibrated are checked in real time, whether drift exists or not is judged, and if drift exists, the transmitter is corrected by using a manual operator through an HART protocol.
Claims (6)
1. The utility model provides a differential pressure transmitter online calibration equipment, includes standard inspection table (1), its characterized in that: the high-pressure measuring end of the standard checking meter (1) is provided with a high-pressure side connecting pipe, the low-pressure measuring end of the standard checking meter (1) is provided with a low-pressure side connecting pipe, the high-pressure side connecting pipe and the low-pressure side connecting pipe are respectively connected with a quick union (2), the quick union (2) on the high-pressure side of the standard checking meter (1) is used for connecting a high-pressure side sewage discharge end of a differential pressure transmitter (5) to be checked, the quick union (2) on the low-pressure side of the standard checking meter (1) is used for connecting a low-pressure side sewage discharge end of the differential pressure transmitter (5) to be checked, and the high-pressure side connecting pipe is.
2. The differential pressure transmitter online verification device of claim 1, wherein: a blind plate (41) for high-pressure side verification is detachably arranged at the high-pressure measuring end of the differential pressure transmitter (5) to be calibrated, and a blind plate (42) for low-pressure side verification is detachably arranged at the low-pressure measuring end of the differential pressure transmitter (5) to be calibrated.
3. The differential pressure transmitter online verification device of claim 1, wherein: the quick movable joint (2) comprises a connecting column (21), one end of the connecting column (21) is in threaded connection with a high-pressure side sewage discharge end or a low-pressure side sewage discharge end of the differential pressure transmitter (5) to be calibrated, and a through hole (22) is formed in the axis of the connecting column (21); the other end of the connecting column (21) is detachably connected with a joint connecting pipe (23), and the joint connecting pipe (23) is used for being connected with a high-pressure side connecting pipe or a low-pressure side connecting pipe.
4. The differential pressure transmitter online verification device of claim 3, wherein: joint connecting pipe (23) through-connection nut (24) center sets up, and joint connecting pipe (23) one end is equipped with snap ring (25), and snap ring (25) are located inside joint nut (24), and joint nut (24) are connected through the screw thread mode with spliced pole (21), and spliced pole (21) terminal surface is equipped with ring channel (26), and snap ring (25) are used for inserting and set up in ring channel (26).
5. The differential pressure transmitter online verification device of claim 4, wherein: an elastic gasket is arranged in the annular groove (26).
6. The differential pressure transmitter online verification device according to claim 4 or 5, wherein: the outer walls of the connecting column (21) and the joint screw cap (24) are provided with torsion lengthening rods (27).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020490795.XU CN211626804U (en) | 2020-04-07 | 2020-04-07 | Online calibration device of differential pressure transmitter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020490795.XU CN211626804U (en) | 2020-04-07 | 2020-04-07 | Online calibration device of differential pressure transmitter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211626804U true CN211626804U (en) | 2020-10-02 |
Family
ID=72620323
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020490795.XU Active CN211626804U (en) | 2020-04-07 | 2020-04-07 | Online calibration device of differential pressure transmitter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211626804U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113324692A (en) * | 2021-07-05 | 2021-08-31 | 北京康斯特仪表科技股份有限公司 | Pressure gauge, quick calibration method thereof and pressure calibration device |
| CN114235274A (en) * | 2021-12-14 | 2022-03-25 | 泰安佳业环保科技有限公司 | Pressure and differential pressure checking system and method |
| WO2022155813A1 (en) * | 2021-01-20 | 2022-07-28 | 深圳市特安电子有限公司 | Remote transmission differential pressure transmitter and zeroing method |
-
2020
- 2020-04-07 CN CN202020490795.XU patent/CN211626804U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022155813A1 (en) * | 2021-01-20 | 2022-07-28 | 深圳市特安电子有限公司 | Remote transmission differential pressure transmitter and zeroing method |
| CN113324692A (en) * | 2021-07-05 | 2021-08-31 | 北京康斯特仪表科技股份有限公司 | Pressure gauge, quick calibration method thereof and pressure calibration device |
| CN114235274A (en) * | 2021-12-14 | 2022-03-25 | 泰安佳业环保科技有限公司 | Pressure and differential pressure checking system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211626804U (en) | Online calibration device of differential pressure transmitter | |
| CN1963402A (en) | A differential pressure type flow measuring method and flow apparatus thereof | |
| CN105241614A (en) | Detection apparatus of pressure pipeline | |
| CN201555685U (en) | Pressure sensor's installation, calibration equipment | |
| CN100392362C (en) | Liquid level transmitter for sealed oil tank | |
| CN210065276U (en) | Metering pump set integrating pressure stabilization, overflow and metering | |
| CN202141557U (en) | Absolute pressure gauge | |
| CN201514262U (en) | On-line scaling and calibrating flowmeter | |
| CN219657074U (en) | Portable flange equipment measuring device | |
| CN219495324U (en) | Bidirectional flow Pi Tuoer flowmeter | |
| CN211477502U (en) | Adaptive assembly for calibrating pressure gauge | |
| CN210638744U (en) | Differential pressure flowmeter | |
| CN102023070B (en) | Pressure sensor mounting and verifying device and pressure sensor correcting method | |
| CN208043318U (en) | A kind of manometer metering device free of demolition | |
| CN211042340U (en) | Nozzle flowmeter | |
| CN110864847A (en) | Calibration method of pump station pressure gauge for cold extrusion process | |
| CN209892552U (en) | Portable hydraulic system fault detection device | |
| CN210533420U (en) | Electromagnetic water meter with pressure taking function | |
| CN219694424U (en) | Differential pressure transmitter detection sensor | |
| CN219996255U (en) | Saddle type water flow indicator high-pressure sealing structure | |
| CN219694239U (en) | Round wedge flowmeter | |
| CN217111039U (en) | Liquid calibration device | |
| CN208270139U (en) | Coke oven gas pipe surveys pressure and takes mouth structure | |
| CN216695395U (en) | Portable tool for checking fluid pressure | |
| CN220472726U (en) | Stainless steel welding watchcase |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |