Connecting device for calibrating pressure transmitter

Abstract

The invention discloses a connecting device for verification of a pressure transmitter, which comprises a conversion box body, an adjustable linear voltage regulator is arranged in the conversion box body, and a power supply display screen, a change-over switch, a voltage adjusting knob and a power switch are arranged on the front side of the conversion box body. A binding post, a connecting socket and a power socket are arranged on the back face of the conversion box body, the power socket is electrically connected with the adjustable linear voltage stabilizer, the power switch is electrically connected with the adjustable linear voltage stabilizer, and the power supply display screen and the voltage adjusting knob are electrically connected with the adjustable linear voltage stabilizer. And the binding post is electrically connected with the connecting socket through the change-over switch. By the adoption of the connecting device, through the configured conversion box and the conversion switch, rapid wiring can be achieved, the risk of short circuit caused by wiring misoperation is reduced, and the connecting device is simple in overall structure, convenient to operate, capable of greatly improving working efficiency and suitable for application and popularization.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instrument verification, and in particular to a connecting device used for pressure transmitter verification. Background Art

[0002] Pressure, also known as pressure intensity, is one of the most widely used measurement parameters both in industrial and agricultural production processes and in scientific research. In order to ensure the smooth progress of production activities and facilitate the safe and reliable operation of various process flows, pressure must be measured and controlled by using various pressure instruments. The basic task of pressure measurement is to ensure the reliable performance of instruments and meters for measuring pressure. Common electrical pressure gauges include pressure sensors, pressure transmitters, etc. As the primary link of automatic control and automatic detection, sensors play an important role in the development of science and technology. Among them, pressure sensors are the most widely used, especially in aviation, aerospace, petrochemical, electric power, metallurgy and other industries. Modern aircraft are equipped with a large number of pressure sensors. From system pressure to engine pressure, from static pressure, dynamic pressure to flight parameters, pressure measurement is everywhere, and pressure transmitters are the most common pressure instruments in industry.

[0003] In the actual production process, it is necessary to use a pressure transmitter in conjunction with the corresponding equipment to achieve pressure control of the hydraulic (or pneumatic) system. The laboratory verifies the pressure transmitter by simulating the pressure increase or decrease process of the medium (liquid or gas) at the production site, converting the pressure signal into an electrical signal to achieve the purpose of measuring pressure.

[0004] Since an adjustable voltage-stabilized power supply is required for the calibration of the pressure transmitter, the voltage-stabilized power supply needs to be moved to the pressure transmitter calibration platform before the calibration. After confirming that the pressure transmitter is a two-wire system (current output connected to an ammeter) or a three-wire system (voltage output connected to a voltmeter), the voltage-stabilized power supply, pressure transmitter, and ammeter or voltmeter are connected with a clip line, and the preparation work before the calibration is completed. When calibrating or calibrating the pressure transmitter, in order to solve the problem that the adjustable voltage-stabilized power supply needs to be moved before the calibration, the connection is cumbersome, and there are many connection points that are prone to short circuits and cause equipment damage, it is very necessary to provide a connection device for the calibration of the pressure transmitter to meet the actual use needs, which also has a wide range of promotion value. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a connection device with simple structure and convenient operation in view of the problems existing in the background technology. By using the connection device, it is possible to effectively solve the problem that when the existing two-wire or three-wire pressure transmitter is verified or calibrated, an adjustable voltage-stabilized power supply needs to be moved, and the connection is complicated and a large number of connection points easily cause short circuits, thereby causing equipment damage. Specifically, it is a connection device for pressure transmitter verification.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is: a connection device for pressure transmitter calibration, including a conversion box, an adjustable linear regulator is arranged inside the conversion box, a power supply display screen, a conversion switch, a voltage adjustment knob and a power switch are arranged on the front of the conversion box, and a terminal, a connection socket and a power socket are arranged on the back of the conversion box, the power socket is used for an external power supply, the power socket is electrically connected to the adjustable linear regulator, and the power switch is electrically connected to the adjustable linear regulator, the power supply display screen and the voltage adjustment knob are electrically connected to the adjustable linear regulator respectively, the terminal is electrically connected to the connection socket through the conversion switch, the connection socket is used to be electrically connected to the pressure transmitter to be calibrated, the terminal is used to externally connect an ammeter or a voltmeter, the adjustable linear regulator provides a power supply for calibration, and the calibration of the pressure transmitter to be calibrated is achieved through the ammeter or the voltmeter.

[0007] Furthermore, a connection device for pressure transmitter calibration described in the present invention is adopted, the terminal includes a positive terminal and a negative terminal, and the conversion switch includes a current output switch and a voltage output switch, the voltage output switch and the current output switch are integrated toggle switches, the toggle switch is a six-pin switch, the six-pin switch includes six connecting pins, namely connecting pin one, connecting pin two, connecting pin three, connecting pin four, connecting pin five and connecting pin six, wherein the connecting pin three and connecting pin four are short-circuited, the connecting pin two is connected to the negative terminal in the terminal, the connecting pin six is ​​connected to the positive terminal in the terminal, one end of the connecting pin one is grounded, and the other end is connected to the negative pole of the power supply, and the connecting pin five is connected to the positive pole of the power supply; the pressure transmitter to be calibrated connected to the connecting socket is a two-wire transmitter or a three-wire transmitter.

[0008] Furthermore, a connection device for pressure transmitter calibration described in the present invention is adopted, wherein the connection socket has three wire holes, and the three wire holes are respectively wire hole one, wire hole two and wire hole three, wherein one end of the wire hole one is grounded, and the other end is detachably connected to the negative power supply electrode and the negative output power supply electrode of the pressure transmitter to be calibrated; one end of the wire hole two is electrically connected to the connecting pin four in the button switch, and the other end is detachably connected to the positive power supply electrode of the pressure transmitter to be calibrated; one end of the wire hole three is electrically connected to the positive terminal in the terminal, and the other end is detachably connected to the positive output power supply electrode of the pressure transmitter to be calibrated; wherein, by using an ammeter or voltmeter externally connected to the terminal, the current output switch and the voltage output switch in the conversion switch are respectively turned to the current gear or the voltage gear, so as to realize the current calibration of the two-wire transmitter electrically connected to the connection socket or the voltage calibration of the three-wire transmitter.

[0009] Furthermore, a connection device for pressure transmitter calibration described in the present invention is used, the pressure transmitter to be calibrated is set as a two-wire transmitter, the terminal is externally connected to an ammeter, and the specific calibration method is that the power socket is externally connected to a power supply, the power switch is turned on, and the power supply display screen displays the voltage. The voltage adjustment knob is manually operated first to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the two-wire transmitter, and then the conversion switch is operated to make the current output switch turn to the current gear, the positive pole of the power supply of the power supply is short-circuited with the connection pin six through the connection pin five of the six-pin switch, and then connected to the positive pole of the ammeter by the positive terminal electrically connected to the connection pin six, and the negative pole of the ammeter is connected to the connection pin two of the six-pin switch through the negative terminal in the terminal, and then short-circuited with the connection pin four of the six-pin switch, and finally connected to the positive pole of the power supply of the two-wire transmitter, the negative pole of the power supply of the two-wire transmitter is connected to the negative pole of the power supply of the power supply, the pressure signal is input through the two-wire transmitter, and the corresponding current signal is output, and the current value displayed by the ammeter is the detection value.

[0010] Furthermore, a connection device for pressure transmitter calibration described in the present invention is used, the pressure transmitter to be calibrated is set as a three-wire transmitter, the terminal is externally connected to a voltmeter, and the specific calibration method is that the power socket is externally connected to a power supply, the power switch is turned on, and the power supply display screen displays the voltage. The voltage adjustment knob is manually operated first to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the three-wire transmitter, and then the conversion switch is operated to make the voltage output switch turn to the voltage gear, the positive pole of the power supply is short-circuited with the connecting pin four through the connecting pin five of the six-pin switch, and then connected to the positive pole of the power supply of the three-wire transmitter through the connecting pin four, and the negative pole of the voltmeter is connected to the connecting pin two of the six-pin switch through the negative pole terminal in the terminal, and is short-circuited with the connecting pin one through the connecting pin two of the six-pin switch, and is connected to the negative pole of the power supply through the connecting pin one, and the negative pole of the power supply of the three-wire transmitter is connected to the negative pole of the power supply, and the pressure signal is input through the three-wire transmitter, and the corresponding voltage signal is output, and the voltage value displayed on the voltmeter is the detection value.

[0011] Furthermore, using the connection device for pressure transmitter calibration described in the present invention, the power socket is used for externally connecting to a 220V AC power supply.

[0012] Furthermore, using the connection device for pressure transmitter verification described in the present invention, the voltage adjustment knob is used to adjust the power supply provided by the adjustable linear regulator.

[0013] Furthermore, using the connection device for pressure transmitter calibration described in the present invention, the power supply display screen is used to display the power supply provided by the adjustable linear regulator, and the power supply is a 24V DC power supply or a 12V DC power supply.

[0014] Furthermore, a connection device for pressure transmitter calibration described in the present invention is adopted, the power supply display screen on the front of the conversion box is arranged on the left side of the conversion box, the voltage adjustment knob and the power switch are arranged on the right side of the conversion box, and the conversion switch is placed in the middle of the conversion box, wherein the voltage adjustment knob is located above the power switch; the terminal posts on the back of the conversion box are located on the right side of the conversion box, the connection socket is located on the left side of the conversion box, and the power socket is located in the middle of the conversion box, wherein the connection socket and the terminal posts are located above the power socket and on its left and right sides.

[0015] Compared with the prior art, the connection device for pressure transmitter calibration described in the present invention has the following beneficial effects: through the configured conversion box, an adjustable linear voltage regulator is provided inside the conversion box, and a power supply display screen, a conversion switch, a voltage adjustment knob and a power switch are provided on the front of the conversion box, and wiring posts, a connection socket and a power socket are provided on the back of the conversion box. An ammeter or a voltmeter is externally connected with the wiring posts in the conversion box, and the power supply voltage required by the pressure transmitter to be calibrated is adjusted by the voltage adjustment knob. By reversing the conversion switch, it can be turned to the current gear or the voltage gear, thereby realizing the calibration or calibration of the two-wire or three-wire pressure transmitter, without the need to cumbersomely move the adjustable voltage-stabilized power supply, and the cumbersome connection and the large number of connection points easily cause short circuit problems.

[0016] It can be seen that by adopting the connection device described in the present invention, through the configured conversion box and the use of the conversion switch, rapid connection can be achieved, which greatly reduces the risk of short circuit caused by operator's wiring error operation. Its overall structure is simple and easy to operate, which greatly improves work efficiency and is suitable for popularization and use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the circuit connection inside the conversion box of the present invention; Figure 2 This is a schematic diagram of the front structure of the conversion box according to the present invention; Figure 3 This is a schematic diagram of the back structure of the conversion box according to the present invention; Figure 4 A connection circuit diagram for the pressure transmitter of the present invention during calibration; Figure 5 This is a workflow diagram for calibrating the two-wire pressure transmitter to be calibrated according to the present invention; Figure 6 The present invention is a flowchart of the process of calibrating the three-wire pressure transmitter to be calibrated. DETAILED DESCRIPTION

[0019] The following is a description of the implementation of the present invention by means of specific embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0020] It should be noted that the structures, proportions, sizes, etc. drawn in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present invention, should still fall within the scope of the technical content disclosed by the present invention. At the same time, the description of the orientation involved in this specification, such as the terms "upper", "lower", "left", "right", etc., are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of the relative relationship, without substantial change in the technical content, should also be regarded as the scope of the implementation of the present invention. Its purpose is only to facilitate the description of the present invention and simplify the description, and it does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation of the present invention.

[0021] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "provided with" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0022] It should be noted that the term "comprise" or any other variation is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or apparatus. Example 1

[0023] like Figures 1 to 4As shown, a connection device for pressure transmitter calibration provided by this embodiment includes a conversion box, an adjustable linear regulator is arranged inside the conversion box, a power supply display screen, a connection socket, a voltage adjustment knob and a power switch are arranged on the front of the conversion box, and a terminal, a conversion switch and a power socket are arranged on the back of the conversion box, the power socket is used for an external power supply, the power socket is electrically connected to the adjustable linear regulator, and the power switch is electrically connected to the adjustable linear regulator, the power supply display screen and the voltage adjustment knob are electrically connected to the adjustable linear regulator respectively, the terminal is electrically connected to the connection socket through the conversion switch, the connection socket is used to be electrically connected to the pressure transmitter to be calibrated, the terminal is used to be externally connected to an ammeter or a voltmeter, the adjustable linear regulator provides a power supply for calibration, and the pressure transmitter to be calibrated is calibrated through the ammeter or the voltmeter.

[0024] Further, a connection device for calibrating a pressure transmitter described in this embodiment is used, the terminal includes a positive terminal and a negative terminal, and the conversion switch includes a current output switch and a voltage output switch, the voltage output switch and the current output switch are integrated toggle switches, the toggle switch is a six-pin switch, the six-pin switch includes six connecting pins, namely connecting pin 1, connecting pin 2, connecting pin 3, connecting pin 4, connecting pin 5, and connecting pin 6, wherein the connecting pin 4 and the connecting pin 3 are short-circuited, the connecting pin 2 is connected to the negative terminal in the terminal, the connecting pin 6 is connected to the positive terminal in the terminal, one end of the connecting pin 1 is grounded, and the other end is connected to the negative pole of the power supply, and the connecting pin 5 is connected to the positive pole of the power supply; the pressure transmitter to be calibrated connected to the connecting socket It is a two-wire transmitter or a three-wire transmitter; and the connecting socket has three wire holes, which are respectively wire hole 1, wire hole 2 and wire hole 3, wherein one end of the wire hole 1 is grounded, and the other end is detachably connected to the negative pole of the power supply and the negative pole of the output power supply of the pressure transmitter to be calibrated; one end of the wire hole 2 is electrically connected to the connecting pin 4 4 in the button switch, and the other end is detachably connected to the positive pole of the power supply of the pressure transmitter to be calibrated; one end of the wire hole 3 is electrically connected to the positive pole terminal in the terminal, and the other end is detachably connected to the positive pole of the output power supply of the pressure transmitter to be calibrated; wherein, by using the ammeter or voltmeter externally connected to the terminal, the current output switch and the voltage output switch in the conversion switch are respectively turned to the current gear or turned to the voltage gear, so as to realize the current calibration of the two-wire transmitter or the voltage calibration of the three-wire transmitter electrically connected to the connecting socket.

[0025] Furthermore, a connection device for pressure transmitter calibration described in this embodiment is used, the power socket is used to connect an external 220V AC power supply; the voltage adjustment knob is used to adjust the power supply provided by the adjustable linear regulator, and the power supply display screen is used to display the power supply provided by the adjustable linear regulator, and the power supply is a 24V DC power supply or a 12V DC power supply.

[0026] Furthermore, a connection device for pressure transmitter calibration described in this embodiment is adopted. In order to make the overall layout of the conversion box reasonable and convenient for connection and operation, the power supply display screen on the front of the conversion box is arranged on the left side of the conversion box, the power switch and the voltage adjustment knob are arranged on the right side of the conversion box, and the conversion switch is located in the middle of the front of the conversion box, wherein the voltage adjustment knob is located above the power switch; the terminal on the back of the conversion box is located on the right side of the conversion box, and the connection socket on the back of the conversion box is located on the left side of the conversion box. The power sockets on the back of the conversion box are all located in the middle of the conversion box, wherein the connection socket and the terminal are located above the power socket and on its left and right sides. The circuit connection structure of the adjustable linear regulator arranged inside the conversion box is as shown in FIG. Figure 1 As shown, since the existing voltage stabilizer is used, its specific circuit connection structure is not described in detail. Example 2

[0027] like Figure 5 As shown, this embodiment provides a calibration method for two-wire transmitter verification using the connection device described in Example 1. The calibration method described in this embodiment is used. The pressure transmitter to be calibrated is set as a two-wire transmitter. The terminal is externally connected to an ammeter. The specific calibration method is to connect the power socket to an external power supply, turn on the power switch, and the power supply display screen displays the voltage. First, manually operate the voltage adjustment knob to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the two-wire transmitter, and then operate the conversion switch to turn the current output switch to the current gear. The positive pole of the power supply is connected to the power supply through six The connection pin five 5 of the foot switch is short-circuited with the connection pin six 6, and then the positive terminal electrically connected to the connection pin six 6 is connected to the positive pole of the ammeter, and the negative pole of the ammeter is connected to the connection pin two 2 of the six-pin switch via the negative terminal in the terminal, and then the connection pin two 2 of the six-pin switch is short-circuited with the connection pin three 3, and finally connected to the positive power supply pole of the two-wire transmitter through the connection pin four 4 of the six-pin switch, the negative power supply pole of the two-wire transmitter is connected to the negative power supply pole of the power supply, the pressure signal is input through the two-wire transmitter, and the corresponding current signal is output, and the current value displayed on the ammeter is the detection value. Example 3

[0028] like Figure 6As shown, this embodiment provides a calibration method for three-wire transmitter verification using the connection device described in Example 1. The calibration method described in this embodiment is used. The pressure transmitter to be calibrated is set as a three-wire transmitter. The terminal is externally connected to a voltmeter. The specific calibration method is to connect the power socket to an external power supply, turn on the power switch, and the power supply display screen displays the voltage. First, manually operate the voltage adjustment knob to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the three-wire transmitter, and then operate the conversion switch to turn the voltage output switch to the voltage gear. The positive pole of the power supply is connected to the positive pole of the power supply through the six-pin switch. Connector pin four 4 is short-circuited with connector pin five 5, and then connector pin four 4 is connected to the positive power supply electrode of the three-wire transmitter, and the negative electrode of the voltmeter is connected to connector pin two 2 of the six-pin switch via the negative terminal in the terminal, and connector pin two 2 of the six-pin switch is short-circuited with connector pin one 1, and connected to the negative power supply electrode of the power supply through connector pin one 1, and the negative power supply electrode of the three-wire transmitter is connected to the negative power supply electrode of the power supply, and the positive power output electrode of the three-wire transmitter is connected to the positive electrode of the terminal, and the pressure signal is input through the three-wire transmitter, and the corresponding voltage signal is output, and the voltage value displayed on the voltmeter is the detection value.

[0029] With the connection device for pressure transmitter calibration provided by the present invention, since the adjustable linear regulator arranged inside the conversion box is an existing device, the specific circuit connection inside the conversion box is as follows: Figure 1 As shown, since this technical solution is an existing solution, no detailed description is given.

[0030] The connection device described in the present invention is adopted, through the configuration of the conversion box, since an adjustable linear voltage regulator is provided inside the conversion box, and a power supply display screen, a connection socket, a voltage adjustment knob and a power switch are provided on the front of the conversion box, and a terminal post, a conversion switch and a power socket are provided on the back of the conversion box. An ammeter or a voltmeter is externally connected with the terminal post in the conversion box, and the power supply voltage required by the pressure transmitter to be calibrated is adjusted by the voltage adjustment knob. By reversing the conversion switch, it can be turned to the current gear or the voltage gear, thereby realizing the verification or calibration of the two-wire or three-wire pressure transmitter, without the need to cumbersomely move the adjustable voltage-stabilized power supply, and the cumbersome connection and the large number of connection points are prone to short circuit problems.

[0031] In summary, by adopting the connection device described in the present invention, two different connection lines and an adjustable linear regulator are solidified in the conversion box. The two-wire ammeter and the three-wire voltmeter share the same wiring post. The pressure transmitter connection socket is plugged in. By toggling the conversion switch, quick connection can be achieved, which greatly reduces the risk of short circuit caused by wiring error operation by the operator. The overall structure is simple, the operation is convenient, the work efficiency is greatly improved, and it is suitable for popularization and use.

[0032] Other aspects of the present invention that are not described in detail are all conventional techniques known to those skilled in the art.

[0033] The protection scope of the present invention is not limited to the technical solutions disclosed in the specific implementation methods. The above description is only a preferred implementation method of the present invention and does not limit the present invention. Any minor modifications, equivalent substitutions and improvements made according to the technical solutions of the present invention should be included in the protection scope of the technical solutions of the present invention.

Claims

1. A connection device for pressure transmitter calibration, comprising a conversion box, wherein an adjustable linear regulator is arranged inside the conversion box, characterized in that: A power supply display screen, a conversion switch, a voltage adjustment knob and a power switch are provided on the front of the conversion box, and a terminal, a connection socket and a power socket are provided on the back of the conversion box. The power socket is used for an external power supply, the power socket is electrically connected to an adjustable linear regulator, and the power switch is electrically connected to the adjustable linear regulator. The power supply display screen and the voltage adjustment knob are electrically connected to the adjustable linear regulator respectively. The terminal is electrically connected to the connection socket through the conversion switch, and the connection socket is used to be electrically connected to the pressure transmitter to be calibrated. The terminal is used for an external ammeter or voltmeter. The adjustable linear regulator provides a power supply for calibration, and the pressure transmitter to be calibrated is calibrated through the ammeter or voltmeter.

2. A connection device for pressure transmitter calibration according to claim 1, characterized in that: The terminal includes a positive terminal and a negative terminal, and the conversion switch includes a current output switch and a voltage output switch, the voltage output switch and the current output switch are integrated button switches, the button switch is a six-pin switch, the six-pin switch includes six connecting pins, namely connecting pin one, connecting pin two, connecting pin three, connecting pin four, connecting pin five and connecting pin six, wherein the connecting pin three and connecting pin four are short-circuited, the connecting pin two is connected to the negative terminal in the terminal, the connecting pin six is ​​connected to the positive terminal in the terminal, one end of the connecting pin one is grounded, and the other end is connected to the negative pole of the power supply, and the connecting pin five is connected to the positive pole of the power supply; the pressure transmitter to be calibrated connected to the connecting socket is a two-wire transmitter or a three-wire transmitter.

3. A connection device for pressure transmitter calibration according to claim 2, characterized in that: The connecting socket is composed of three wire plug holes, which are respectively wire plug hole one, wire plug hole two and wire plug hole three, wherein one end of the wire plug hole one is grounded, and the other end is detachably connected to the negative power supply electrode and the negative output power supply electrode of the pressure transmitter to be calibrated; one end of the wire plug hole two is electrically connected to the connecting pin four in the button switch, and the other end is detachably connected to the positive power supply electrode of the pressure transmitter to be calibrated; one end of the wire plug hole three is electrically connected to the positive terminal in the terminal, and the other end is detachably connected to the positive output power supply electrode of the pressure transmitter to be calibrated; wherein, by using the ammeter or voltmeter externally connected to the terminal, the current output switch and the voltage output switch in the conversion switch are respectively turned to the current gear or the voltage gear, so as to realize the current calibration of the two-wire transmitter electrically connected to the connecting socket or the voltage calibration of the three-wire transmitter.

4. A connection device for pressure transmitter calibration according to claim 3, characterized in that: The pressure transmitter to be calibrated is set as a two-wire transmitter, and the terminal is externally connected to an ammeter. The specific calibration method is that the power socket is externally connected to a power supply, the power switch is turned on, and the power supply display screen displays the voltage. The voltage adjustment knob is manually operated first to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the two-wire transmitter, and then the conversion switch is operated to make the current output switch turn to the current gear. The positive pole of the power supply is short-circuited with the connection pin six through the connection pin five of the six-pin switch, and then connected to the positive pole of the ammeter by the positive terminal electrically connected to the connection pin six, and the negative pole of the ammeter is connected to the connection pin two of the six-pin switch through the negative terminal in the terminal, and then short-circuited with the connection pin four of the six-pin switch, and finally connected to the positive pole of the power supply of the two-wire transmitter, and the negative pole of the power supply of the two-wire transmitter is connected to the negative pole of the power supply of the power supply, and the pressure signal is input through the two-wire transmitter, and the corresponding current signal is output, and the current value displayed by the ammeter is the detection value.

5. A connection device for pressure transmitter calibration according to claim 3, characterized in that: The pressure transmitter to be calibrated is set as a three-wire transmitter, and the terminal is externally connected to a voltmeter. The specific calibration method is that the power socket is externally connected to a power supply, the power switch is turned on, and the power supply display screen displays the voltage. The voltage adjustment knob is manually operated first to make the output voltage of the adjustable linear regulator reach the power supply voltage required by the three-wire transmitter, and then the conversion switch is operated to make the voltage output switch turn to the voltage gear. The positive pole of the power supply is short-circuited with the connecting pin four through the connecting pin five of the six-pin switch, and then connected to the positive pole of the power supply of the three-wire transmitter through the connecting pin four, and the negative pole of the voltmeter is connected to the connecting pin two of the six-pin switch through the negative pole terminal in the terminal, and is short-circuited with the connecting pin one through the connecting pin two of the six-pin switch, and is connected to the negative pole of the power supply through the connecting pin one, and the negative pole of the power supply of the three-wire transmitter is connected to the negative pole of the power supply, and the pressure signal is input through the three-wire transmitter, and the corresponding voltage signal is output, and the voltage value displayed on the voltmeter is the detection value.

6. A connection device for pressure transmitter calibration according to claim 1, characterized in that: The power socket is used for externally connecting to a 220V AC power source.

7. A connection device for pressure transmitter calibration according to claim 1, characterized in that: The voltage adjustment knob is used to adjust the power supply provided by the adjustable linear regulator.

8. The connection device for pressure transmitter calibration according to claim 1, characterized in that: The power supply display screen is used to display the power supply provided by the adjustable linear regulator, and the power supply is a 24V DC power supply or a 12V DC power supply.

9. A connection device for pressure transmitter calibration according to claim 1, characterized in that: The power supply display screen on the front of the conversion box is arranged on the left side of the conversion box, the power switch and the voltage adjustment knob are arranged on the right side of the conversion box, and the conversion switch is placed in the middle of the conversion box, wherein the voltage adjustment knob is located above the power switch; the terminal posts on the back of the conversion box are placed on the right side of the back of the conversion box, the connecting socket is placed on the left side of the back of the conversion box, and the power socket is placed in the middle of the back of the conversion box, wherein the connecting socket and the terminal posts are located above the power socket and on its left and right sides.

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