Digital pressure transmitter with external zero setting function

Abstract

The utility model discloses an external zero setting digital pressure transmitter, which relates to the technical field of pressure transmitters and comprises a shell, a pressure sensor and a circuit board are arranged in the shell, a potentiometer is connected onto the circuit board, the pressure sensor and the potentiometer are both electrically connected with the circuit board, and the circuit board is electrically connected with the shell. One end of the shell is provided with a pressure connector, the other end of the shell is provided with a plug, the plug is electrically connected with the circuit board through a wire, the plug is locked on the shell through a locking ring, the locking ring is detachably connected with the shell, and after the locking ring and the plug are detached, the potentiometer is exposed out of a port of the shell. And the potentiometer can be adjusted through the port of the shell, so that the calibration of the pressure transmitter is realized. According to the digital pressure transmitter with the external zero setting function, calibration of the pressure transmitter can be achieved through the potentiometer of the digital pressure transmitter, calibration is convenient, and calibration cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure transmitters, in particular to an external zero-adjusting digital pressure transmitter. Background Art

[0002] A pressure transmitter is a device used to measure pressure and convert it into a standard signal output. It is widely used in industrial automation control systems to monitor and control pressure parameters. Currently, the calibration of the pressure transmitter needs to be connected to a computer to adjust the output zero and full-scale signals.

[0003] In the actual use of the pressure transmitter, in order to calibrate the pressure transmitter, it is necessary to carry a computer with you, which not only increases the calibration cost, but also makes the calibration process very troublesome and extremely inconvenient to use. Utility Model Content

[0004] The utility model aims to provide a digital pressure transmitter with external zero adjustment to solve the problems existing in the above-mentioned prior art, and can realize the calibration of the pressure transmitter through its own potentiometer, with convenient calibration and low calibration cost.

[0005] To achieve the above purpose, the utility model provides the following solutions:

[0006] The utility model provides an externally zeroed digital pressure transmitter, comprising a shell, wherein a pressure sensor and a circuit board are arranged in the shell, a potentiometer is connected to the circuit board, the pressure sensor and the potentiometer are both electrically connected to the circuit board, one end of the shell has a pressure joint, and the other end has a plug, the plug is electrically connected to the circuit board through a wire, the plug is locked on the shell through a locking ring, the locking ring and the shell can be detachably connected, after the locking ring and the plug are removed, the potentiometer is exposed in a port of the shell, the potentiometer can be adjusted through the port of the shell, and the pressure transmitter is calibrated.

[0007] Preferably, the shell includes a first shell and a second shell, the first shell is connected to the second shell by threads, the pressure joint is arranged at an end of the first shell away from the second shell, the pressure sensor is arranged in the first shell and close to the pressure joint, a sensor locking ring is connected in the first shell, the sensor locking ring is threadedly connected to an end of the first shell away from the pressure joint, and the pressure sensor is pressed into the first shell, and the sensor locking ring is filled with jelly glue.

[0008] Preferably, the circuit board and the potentiometer are both arranged in the second shell, and the second shell is filled with jelly glue to wrap the circuit board and the potentiometer inside and expose the adjustment part of the potentiometer, and the plug and the locking ring are arranged at one end of the second shell away from the first shell.

[0009] Preferably, the inner wall of the second shell is provided with insulating barley paper.

[0010] Preferably, an anti-interference sheet is further provided in the second shell, the anti-interference sheet is located between the potentiometer and the plug, the anti-interference sheet is provided with a through hole for the adjustment part of the potentiometer to extend out, the anti-interference sheet is also provided with a through hole for the wire to pass through, and a protective coil is provided in the through hole.

[0011] Preferably, an air duct is provided in the shell, one end of the air duct passes through the jelly glue in the first shell to lead to the pressure sensor, and the other end passes through the jelly glue in the second shell and the anti-interference sheet to lead to the space between the anti-interference sheet and the plug, and a pressure measuring channel leading to the pressure sensor is provided in the pressure joint.

[0012] Preferably, it also includes a socket, which is plug-connected to the plug.

[0013] Preferably, thread glue is applied at the threaded connection between the first shell and the second shell.

[0014] Compared with the prior art, the utility model has achieved the following technical effects:

[0015] The externally zeroed digital pressure transmitter provided by the utility model can, when in use, require calibration and zeroing, by disassembling the locking ring and the plug to expose the internal potentiometer, and by adjusting the potentiometer, the zero point and full-scale signals output by the digital pressure transmitter can be adjusted to achieve calibration of the digital pressure transmitter, and the calibration process is convenient, and there is no need to connect to a computer for calibration, thereby reducing the calibration cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a structural schematic diagram of the externally zeroed digital pressure transmitter provided by the utility model.

[0018] In the figure: 1-housing, 2-pressure sensor, 3-circuit board, 4-potentiometer, 5-pressure joint, 6-plug, 7-locking ring, 8-first housing, 9-second housing, 10-sensor locking ring, 11-jelly glue, 12-insulating barley paper, 13-anti-interference sheet, 14-protective coil, 15-air guide tube, 16-pressure measuring channel, 17-threaded connection, 18-socket. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0020] The utility model aims to provide an external zero-adjusting digital pressure transmitter to solve the problems existing in the prior art, and can realize the calibration of the pressure transmitter through its own potentiometer, with convenient calibration and low calibration cost.

[0021] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0022] like Figure 1 As shown, this embodiment provides an externally zeroed digital pressure transmitter, including a housing 1, a pressure sensor 2 and a circuit board 3 are arranged in the housing 1, a potentiometer 4 is connected to the circuit board 3, the pressure sensor 2 and the potentiometer 4 are both electrically connected to the circuit board 3, a pressure connector 5 is provided at one end of the housing 1, and a plug 6 is provided at the other end, the plug 6 is electrically connected to the circuit board 3 through a wire, the plug 6 is locked to the housing 1 through a locking ring 7, the locking ring 7 and the housing 1 can be detachably connected, after the locking ring 7 and the plug 6 are removed, the potentiometer 4 is exposed in the port of the housing 1, the potentiometer 4 can be adjusted through the port of the housing 1, and the pressure transmitter is calibrated.

[0023] When calibration is required, the locking ring 7 and the plug 6 can be disassembled to expose the internal potentiometer 4. By adjusting the potentiometer 4, the zero point and full-scale signals output by the digital pressure transmitter can be adjusted to achieve calibration of the digital pressure transmitter. The calibration process is convenient and does not require connection to a computer for calibration, thereby reducing calibration costs.

[0024] In this embodiment, the housing 1 includes a first housing 8 and a second housing 9, the first housing 8 and the second housing 9 are connected by threads, the pressure joint 5 is arranged at one end of the first housing 8 away from the second housing 9, the pressure sensor 2 is arranged in the first housing 8 and close to the pressure joint 5, the first housing 8 is connected with a sensor locking ring 10, the sensor locking ring 10 is threadedly connected to one end of the first housing 8 away from the pressure joint 5, and the pressure sensor 2 is pressed in the first housing 8, and the sensor locking ring 10 is filled with jelly glue 11. After the pressure sensor 2 is pressed by the sensor locking ring 10, the jelly glue 11 is filled to ensure the stability of the pressure sensor 2.

[0025] In this embodiment, the circuit board 3 and the potentiometer 4 are both arranged in the second housing 9, and the second housing 9 is filled with jelly glue 11 to wrap the circuit board 3 and the potentiometer 4 inside, and the adjustment part of the potentiometer 4 is exposed, and the plug 6 and the locking ring 7 are arranged at one end of the second housing 9 away from the first housing 8. By filling the second housing 9 with jelly glue 11 and wrapping the circuit board 3 and the potentiometer 4 inside, the circuit board 3 and the potentiometer 4 can be protected, and the adjustment part of the potentiometer 4 is exposed, which is convenient for adjusting the potentiometer 4 during calibration and zeroing.

[0026] In this embodiment, the inner wall of the second shell 9 is provided with insulating barley paper 12, which further insulates the circuit board 3 and the potentiometer 4 from the shell, thereby improving the safety of use.

[0027] In this embodiment, an anti-interference sheet 13 is further provided in the second housing 9, and the anti-interference sheet 13 is located between the potentiometer 4 and the plug 6. The anti-interference sheet 13 is provided with a through hole for the adjustment part of the potentiometer 4 to extend out, and the anti-interference sheet 13 is also provided with a through hole for the wire to pass through, and a protective coil 14 is provided in the through hole. By providing the anti-interference sheet 13, the interference to the internal electrical components can be reduced and the accuracy of the measurement can be improved.

[0028] In this embodiment, an air duct 15 is provided in the housing 1, one end of the air duct 15 passes through the jelly glue 11 in the first housing 8 to lead to the pressure sensor 2, and the other end passes through the jelly glue 11 in the second housing 9 and the anti-interference sheet 13 to lead to the space between the anti-interference sheet 13 and the plug 6, and a pressure measuring channel 16 leading to the pressure sensor 2 is provided in the pressure connector 5. The provision of the air duct 15 enables one end of the pressure sensor 2 to be connected to the atmosphere, so that the pressure of the environment to be measured can be measured through the pressure measuring channel 16 at the other end of the pressure sensor 2.

[0029] In this embodiment, a socket 18 is also included, and the socket 18 is plug-connected to the plug 6 .

[0030] In this embodiment, thread glue is applied to the threaded connection 17 between the first shell 8 and the second shell 9 to ensure the sealing and tightness of the connection between the two.

[0031] The present invention uses specific examples to illustrate the principle and implementation of the present invention. The above examples are only used to help understand the method and core idea of ​​the present invention. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A digital pressure transmitter with external zero adjustment, characterized in that: It comprises a shell, wherein a pressure sensor and a circuit board are arranged in the shell, a potentiometer is connected to the circuit board, the pressure sensor and the potentiometer are both electrically connected to the circuit board, one end of the shell has a pressure joint, and the other end has a plug, the plug is electrically connected to the circuit board through a wire, the plug is locked on the shell through a locking ring, the locking ring and the shell can be detachably connected, after the locking ring and the plug are removed, the potentiometer is exposed in the port of the shell, the potentiometer can be adjusted through the port of the shell, and the pressure transmitter can be calibrated.

2. The digital pressure transmitter with external zero adjustment according to claim 1, characterized in that: The shell includes a first shell and a second shell, the first shell is connected to the second shell by threads, the pressure joint is arranged at one end of the first shell away from the second shell, the pressure sensor is arranged in the first shell and close to the pressure joint, a sensor locking ring is connected in the first shell, the sensor locking ring is threadedly connected to one end of the first shell away from the pressure joint, and the pressure sensor is pressed into the first shell, and the sensor locking ring is filled with jelly glue.

3. The digital pressure transmitter with external zero adjustment according to claim 2, characterized in that: The circuit board and the potentiometer are both arranged in the second shell, and the second shell is filled with jelly glue to wrap the circuit board and the potentiometer inside and expose the adjustment part of the potentiometer. The plug and the locking ring are arranged at one end of the second shell away from the first shell.

4. The digital pressure transmitter with external zero adjustment according to claim 3, characterized in that: The inner wall of the second shell is provided with insulating barley paper.

5. The digital pressure transmitter with external zero adjustment according to claim 3, characterized in that: An anti-interference sheet is also provided in the second shell, and the anti-interference sheet is located between the potentiometer and the plug. The anti-interference sheet is provided with a through hole for the adjustment part of the potentiometer to extend out, and the anti-interference sheet is also provided with a through hole for the wire to pass through, and a protective coil is provided in the through hole.

6. The digital pressure transmitter with external zero adjustment according to claim 5, characterized in that: An air duct is provided in the shell, one end of the air duct passes through the jelly glue in the first shell to lead to the pressure sensor, and the other end passes through the jelly glue in the second shell and the anti-interference sheet to lead to the space between the anti-interference sheet and the plug. A pressure measuring channel leading to the pressure sensor is provided in the pressure joint.

7. The digital pressure transmitter with external zero adjustment according to claim 1, characterized in that: It also includes a socket, which is plug-connected with the plug.

8. The digital pressure transmitter with external zero adjustment according to claim 2, characterized in that: Thread glue is applied at the threaded connection between the first shell and the second shell.

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