A PNP type electric contact meter calibration auxiliary device

Abstract

The utility model discloses a PNP type electric contact meter calibration auxiliary device, and the technical field of design auxiliary calibration tools includes: a housing, a wiring board arranged on the housing, an auxiliary calibration circuit arranged inside the housing, the auxiliary calibration circuit including a positive power terminal, a negative power terminal, an adjustable potentiometer and a protective resistor, the positive power terminal is connected to the positive end of the pressure gauge to be measured, the negative power terminal is connected to the protective resistor and the adjustable potentiometer in sequence, the adjustment end of the adjustable potentiometer is connected to the negative end of the pressure gauge to be measured, and the two sides of the adjustable potentiometer are connected in parallel to the signal measurement end of the calibrator. The utility model provides a working voltage for the PNP type pressure gauge by setting a calibration auxiliary device and a built-in power supply, thereby calibrating the PNP type pressure gauge; the structure is simple, no special calibration equipment is required, and the cost is saved; the housing and the wiring board are provided to facilitate the plug-in operation.

Description

Technical Field

[0001] The invention relates to the technical field of auxiliary calibration tools, in particular to a PNP type electric contact meter calibration auxiliary device. Background Art

[0002] Since the existing pressure standard 811A calibrator does not support direct measurement of the switch action of the PNP type electric contact pressure gauge, maintenance personnel are required to connect an external load. At the same time, the meter not only requires an external power supply when working, but also has strict requirements on the current passing through the electronic switch (not less than 20 mA and not more than 100 mA).

[0003] The advantages of this type of pressure gauge over ordinary electric contact pressure gauges are: no wear due to close contact action and almost no impact on the measurement system. Therefore, it has been widely used in various units in our factory in recent years. Due to the large number and different models used in different scenarios, the existing standard instruments cannot directly calibrate this type of meter and require some external auxiliary equipment to achieve it. This greatly increases the workload of maintenance personnel in calibrating this type of instrument, wastes a lot of time, and reduces the work efficiency of maintenance personnel.

[0004] For this purpose, an auxiliary calibration device is designed to cooperate with the existing standard instrument to realize the calibration of PNP type electric contact meters. Utility Model Content

[0005] The technical problem to be solved by the utility model is to solve the deficiencies in the prior art and to design a PNP type electric contact meter calibration auxiliary device.

[0006] The technical solution adopted by the utility model to solve its technical problems is:

[0007] A PNP type electric contact meter calibration auxiliary device, comprising:

[0008] The shell is provided with a wiring board, and an auxiliary calibration circuit is provided inside the shell. The auxiliary calibration circuit includes a positive power terminal, a negative power terminal, an adjustable potentiometer and a protective resistor. The positive power terminal is connected to the positive terminal of the pressure gauge to be tested, and the negative power terminal is connected to the protective resistor and the adjustable potentiometer in sequence. The adjustment end of the adjustable potentiometer is connected to the negative terminal of the pressure gauge to be tested, and the two sides of the adjustable potentiometer are connected in parallel to the signal measurement end of the calibrator.

[0009] As a further technical solution of the utility model, the auxiliary verification circuit also includes an ammeter, and the ammeter is connected in series on the circuit between the protection resistor and the built-in power supply.

[0010] As a further technical solution of the present invention, the signal measuring end of the calibrator is a standard 811A calibrator MEAS sensor.

[0011] As a further technical solution of the utility model, an ammeter, a power supply adjustment knob, a positive power supply terminal, a negative power supply terminal, a meter positive terminal, a meter negative terminal, a measuring end positive terminal and a measuring end negative terminal are arranged on the terminal board; the positive power supply terminal is connected to the positive power supply terminal, the negative power supply terminal is connected to the negative power supply terminal, the positive measuring end terminal and the negative measuring end terminal are connected to the signal measuring end of the calibrator; the positive meter terminal and the negative meter terminal are connected to the pressure gauge to be tested, and the positive power supply terminal and the negative power supply terminal are connected to the power supply.

[0012] As a further technical solution of the utility model, the pressure gauge to be tested is a PNP pressure gauge or an NPN pressure gauge.

[0013] As a further technical solution of the utility model, the shell is made of insulating material.

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

[0015] 1. The utility model can calibrate the PNP type pressure gauge by setting a calibration auxiliary device. It is not necessary to customize a calibrator to calibrate the PNP type pressure gauge. The built-in power supply provides a working voltage for the PNP type pressure gauge, thereby calibrating the PNP type pressure gauge.

[0016] 2. The verification auxiliary device has a simple structure and does not require special verification equipment, which saves costs. The housing and terminal board are provided to facilitate plug-in operation.

[0017] 3. In order to monitor the output current of the built-in power supply, the auxiliary verification circuit also includes an ammeter, which is set on the outer casing for easy viewing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a structural diagram of a PNP type electric contact meter calibration auxiliary device proposed by the utility model;

[0019] Figure 2 This is a front view of the PNP type electric contact meter calibration auxiliary device proposed by the utility model;

[0020] Figure 3 This is the calibration principle wiring diagram of the PNP type electric contact meter calibration auxiliary device proposed by the utility model;

[0021] Figure 4The utility model discloses a wiring diagram of the calibration principle of the NPN type electric contact meter calibration auxiliary device. DETAILED DESCRIPTION

[0022] The following describes the specific implementation of the utility model in conjunction with the accompanying drawings and embodiments:

[0023] It should be noted that the structures, colors, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification so that people familiar with this technology can understand and read them, and are not used to limit the conditions under which the present invention can be implemented. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical contents disclosed in the present invention without affecting the effects and purposes that can be achieved by the present invention.

[0024] At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present utility model. Changes or adjustments to their relative relationships should be regarded as the scope of the implementation of the present utility model without substantially changing the technical content.

[0025] like Figures 1 to 3 As shown, the utility model provides a PNP type electric contact meter calibration auxiliary device, comprising:

[0026] A shell, a wiring board is arranged on the shell, an auxiliary calibration circuit is arranged inside the shell, the auxiliary calibration circuit includes a built-in power supply U, an adjustable potentiometer P and a protection resistor R, the positive output end of the built-in power supply U is used to connect the positive end of the pressure gauge to be tested, the negative output end of the built-in power supply U is connected to the protection resistor R and the adjustable potentiometer P in sequence, the adjustment end of the adjustable potentiometer P is connected to the negative end of the pressure gauge to be tested, and the two sides of the adjustable potentiometer P are connected in parallel to the signal measurement end of the calibrator.

[0027] In the embodiment of the utility model, by setting up a calibration auxiliary device, the PNP type pressure gauge can be calibrated, and there is no need to customize a calibrator specifically for calibrating the PNP type pressure gauge. The calibration auxiliary device provided by the utility model has a built-in power supply to provide a working voltage for the PNP type pressure gauge. When it is subjected to pressure, its working voltage is also supplied. When the pressure reaches the set value, the pressure gauge is measured to see whether it is operating, thereby calibrating the PNP type pressure gauge. The calibration auxiliary device has a simple structure, does not require the use of special calibration equipment, saves costs, and facilitates plug-in operations by setting up a housing and a terminal block.

[0028] In an embodiment of the utility model, in order to monitor the output current of the built-in power supply, the auxiliary verification circuit also includes an ammeter, which is connected in series to the circuit between the protection resistor and the built-in power supply, and the ammeter is arranged on the casing for easy viewing.

[0029] Among them, the signal measurement terminal PV of the calibrator is the MEAS sensor of the standard 811A calibrator.

[0030] See also Figure 3 , U is the built-in output switching power supply of the pressure standard 811A calibrator, VT is the PNP switch in the electric contact pressure gauge, R is the protection resistor, P is the adjustable potentiometer, and PV is the measuring element of the standard 811A calibrator.

[0031] When in use, insert the connecting wire into the test jack according to the drawing, adjust the potential to the maximum resistance, and install the PNP meter on the pressure calibration bench; when everything is ready, turn on the built-in power output switch of 811A, and select the working voltage level that meets the requirements of the meter, and then operate the pressure source control of the pressure standard to raise the pressure to the required action pressure value. At this time, adjust the resistance value of the potentiometer, gradually from large to small, and observe the current reading of the external ammeter. When the measured loop current meets the working current requirements of the PNP meter, the PNP electronic switch is actuated, and the action state of the PNP electronic switch is measured by the signal measurement terminal MEAS of 811A, and the calibration data is automatically recorded. When the PNP switch is actuated, there is voltage at both ends of the potentiometer P, and the calibrator detects the contact action; otherwise, it does not act. In this way, the calibrator only needs to connect the two test wires at both ends of PV and release the built-in power supply of the calibrator. Compared with the previous cumbersome preparation and wiring and unwinding work, it saves a lot of time and greatly improves the work efficiency of the calibrator.

[0032] In the embodiment of the utility model, the wiring board is provided with an ammeter, a power supply adjustment knob, a positive power supply terminal, a negative power supply terminal, a meter positive terminal, a meter negative terminal, a measuring end positive terminal and a measuring end negative terminal. The positive power supply terminal is connected to the positive power supply terminal, the negative power supply terminal is connected to the negative power supply terminal, the measuring end positive terminal and the measuring end negative terminal are connected to the signal measuring end of the calibrator; the meter positive terminal and the meter negative terminal are connected to the pressure gauge to be tested, and the power supply positive terminal and the power supply negative terminal are connected to the power supply. By setting the terminal, it is convenient to plug and connect the wires, and the operation is simple and convenient.

[0033] In the embodiment of the utility model, the shell is made of insulating material. The power supply can be an external power supply or a built-in power supply. Preferably, the power supply is the power supply of the pressure standard 811A calibrator, which is connected to the power supply of the standard calibrator through a connecting line, and no additional power supply is required, which saves costs and is convenient for wiring.

[0034] When the calibrator calibrates the PNP type electric contact meter, it only needs to connect the meter signal line to the corresponding socket on the device panel, and connect the calibrator power output line and measurement signal line to the corresponding socket on the top of the device to calibrate. This solves the problem that the 811A calibrator cannot directly calibrate the PNP type electric contact meter. At the same time, compared with the previous cumbersome preparation and wiring work, it saves a lot of time and greatly improves the work efficiency of the calibrator. In addition, this device can be easily installed and disassembled, and has strong applicability.

[0035] The calibration auxiliary device provided by the utility model is not only suitable for the calibration of PNP type pressure gauges, but also for NPN type pressure gauges. Figure 4 , realizing the function of one object for multiple uses, and also saving about hundreds of thousands of costs for purchasing new standards, achieving maximum utilization of existing standards.

[0036] In addition to the technical problems solved by the present invention, the technical features that constitute the technical solution, and the advantages brought by the technical features of the technical solution as described above, other technical problems that can be solved by the real-time early warning device for operation safety of hydraulic tunnels of the present invention, other technical features included in the technical solution, and the advantages brought by these technical features will be further described in detail in conjunction with the accompanying drawings.

[0037] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A PNP type electric contact meter calibration auxiliary device, characterized in that: include: The shell is provided with a wiring board, and an auxiliary calibration circuit is provided inside the shell. The auxiliary calibration circuit includes a positive power terminal, a negative power terminal, an adjustable potentiometer and a protective resistor. The positive power terminal is connected to the positive terminal of the pressure gauge to be tested, and the negative power terminal is connected to the protective resistor and the adjustable potentiometer in sequence. The adjustment end of the adjustable potentiometer is connected to the negative terminal of the pressure gauge to be tested, and the two sides of the adjustable potentiometer are connected in parallel to the signal measurement end of the calibrator.

2. A PNP type electric contact meter calibration auxiliary device according to claim 1, characterized in that: The auxiliary verification circuit also includes an ammeter, which is connected in series on the line between the protection resistor and the built-in power supply.

3. A PNP type electric contact meter calibration auxiliary device according to claim 1, characterized in that: The signal measuring end of the calibrator is the standard 811A calibrator MEAS sensor.

4. A PNP type electric contact meter calibration auxiliary device according to claim 1, characterized in that: An ammeter, a power supply adjustment knob, a positive power supply terminal, a negative power supply terminal, a meter positive terminal, a meter negative terminal, a measuring end positive terminal and a measuring end negative terminal are arranged on the terminal board; the positive power supply terminal is connected to the positive power supply terminal, the negative power supply terminal is connected to the negative power supply terminal, the positive measuring end terminal and the negative measuring end terminal are connected to the signal measuring end of the calibrator; the positive meter terminal and the negative meter terminal are connected to the pressure gauge to be tested, and the positive power supply terminal and the negative power supply terminal are connected to the power supply.

5. A PNP type electric contact meter calibration auxiliary device according to claim 1, characterized in that: The pressure gauge to be tested is a PNP pressure gauge or an NPN pressure gauge.

6. A PNP type electric contact meter calibration auxiliary device according to claim 1, characterized in that: The shell is made of insulating material.

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