CN106404281A - Simple high-precision pressure transmitter verification device and implementation method thereof - Google Patents

Abstract

The invention discloses a simple high-precision pressure transmitter verification device. The device includes a frame, a needle type emptying valve, a finely-adjustable corrugated membrane box, a standard air pressure output interface, a standard gauge interface, a compressed air input interface, a valuator, a pressure stop valve and a three-way connector. The simple high-precision pressure transmitter verification device is characterized in that the device also includes an installation fixing hole, the needle type emptying valve, the finely-adjustable corrugated membrane box, the standard air pressure output interface, the standard pressure gauge interface, the compressed air input interface, the valuator and the pressure stop valve are arranged on the frame, when the verification device is utilized to perform verification, the standard pressure output interface is connected with a pressure transmitter to be verified, the standard pressure gauge interface is connected with a standard meter, the compressed air input interface is connected with a compressed air source, then the valuator is adjusted, so that output pressure of the valuator is appropriately higher than the upper limit of a measuring range of the pressure transmitter to be verified, through operation of opening and closing the pressure stop valve and the needle type emptying valve, a reference standard pressure gauge displays adjustment of pressure to rise or fall to near a required pressure value, and then the adjustable corrugated membrane box is adjusted, so that a display value of the standard pressure gauge is precise to the required pressure value. Due to adoption of the abovementioned technical scheme, the simple high-precision pressure transmitter verification device has the beneficial effects that using the device to perform high-precision pressure transmitter verification can effectively utilize existing standard equipment, and achieves the purpose of realizing high-precision pressure transmitter verification relatively economically.

Description

A simple high-precision pressure transmitter calibration device and its implementation method

technical field

The invention belongs to the field of teaching instruments and equipment, and relates to a simple and high-precision pressure transmitter calibration device and a realization method thereof.

Background technique

At present, there are two types of known pressure transmitter calibration devices. The first type is a combination of compressed air source, pneumatic regulator, precision pressure gauge, precision voltmeter, and precision resistance to form a corresponding pressure transmitter calibration device. system, this method mainly adjusts the size of the standard pressure with reference to the precision pressure gauge through the pneumatic regulator. This method is low in cost. Due to the limitation of the accuracy of the regulator, it is mostly used for the calibration of conventional pressure transmitters with an accuracy level lower than 1.0. The second is a comprehensive and integrated set of automatic calibration devices. The device itself can automatically generate a standard pressure source with high precision and convenient installation and connection, but the cost and maintenance costs are relatively high, and it is mostly used in large-scale enterprises with strong capital.

Contents of the invention

The purpose of the present invention is to provide a low-cost realization of a high-precision pressure transmitter calibration device and its realization method to address the shortcomings of the above-mentioned prior art.

In order to achieve the above object, the technical solutions adopted by the present invention are as follows.

A simple and high-precision pressure transmitter calibration device, including a frame, a needle-type vent valve, a corrugated membrane box that can be fine-tuned, a standard air pressure output interface, a standard pressure gauge interface, a compressed air input interface, a constant value device, a pressure cut-off valve, Tee connector.

The needle-shaped vent valve, finely adjustable corrugated membrane box, standard air pressure output interface, standard pressure gauge interface, compressed air input interface, constant value device, and pressure cut-off valve are arranged on the frame.

Further, the compressed air input interface is connected with the constant value device.

Further, the constant value device is connected with the pressure cut-off valve.

Further, the pressure cut-off valve is connected with the three-way connector.

Further, the three-way connector is connected to the standard pressure gauge interface.

Further, the three-way connector is connected with the finely adjustable bellows bellows.

Further, the finely adjustable bellows bellows is connected to the standard air pressure output interface.

Further, the finely adjustable bellows bellows is connected to the needle vent valve.

The invention also provides a verification method capable of realizing a high-precision pressure transmitter. Include the following steps:

1) The standard pressure output port is connected to the pressure transmitter to be calibrated.

2) The standard pressure gauge interface is connected to the standard gauge.

3) The compressed air input port is connected to the compressed air source.

4) Adjust the constant value device so that the output pressure of the constant value device is properly higher than the upper limit of the range of the pressure transmitter to be verified.

5) Close the needle vent valve, and open the pressure cut-off valve according to the standard pressure gauge to adjust the pressure to rise to near the required pressure value. Adjust the adjustable bellows diaphragm to make the displayed value of the standard pressure gauge accurate to the required pressure value.

6) Close the pressure cut-off valve, and open the needle-shaped vent valve to adjust the pressure to near the required pressure value according to the standard pressure gauge. Adjust the adjustable bellows diaphragm to make the displayed value of the standard pressure gauge accurate to the required pressure value.

Further, steps 5) and 6) can be repeated until different precise pressure values required by the pressure transmitter are verified.

Due to the adoption of the above technical solution, the beneficial effects of the present invention are: using the present invention for calibration of high-precision pressure transmitters, high-precision standard calibration pressure can be obtained, and existing standard equipment can be effectively used to achieve economical and practical purposes .

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of a simple high-precision pressure transmitter calibration device of the present invention.

In the figure: 1 is the frame, 2 is the installation fixing hole, 3 is the needle vent valve, 4 is the fine-tuning corrugated membrane box, 5 is the standard air pressure output port, 6 is the standard pressure gauge port, 7 is the compressed air input port, 8 9 is a pressure cut-off valve, and 10 is a three-way connector.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The simple and high-precision pressure transmitter calibration device of the present invention is shown in Figure 1, including a frame, a needle-type vent valve, a corrugated membrane box that can be fine-tuned, a standard air pressure output interface, a standard pressure gauge interface, a compressed air input interface, a constant value device, and a pressure gauge. Globe valve, three-way connector.

The needle-shaped vent valve, finely adjustable corrugated membrane box, standard air pressure output interface, standard pressure gauge interface, compressed air input interface, constant value device, and pressure cut-off valve are arranged on the frame.

The compressed air input interface is connected with the constant value device. The constant value device is connected with the pressure cut-off valve. The pressure cut-off valve is connected with the three-way connector. The three-way connector is connected with the standard pressure gauge interface. The three-way connector is connected with the finely adjustable corrugated bellows. The finely adjustable bellows bellows is connected to the standard air pressure output interface. The finely adjustable bellows bellows is connected with the needle-shaped vent valve.

Fig. 1 is a schematic diagram of the overall structure of a simple high-precision pressure transmitter calibration device of the present invention.

In the figure: 1 is the frame, 2 is the installation fixing hole, 3 is the needle vent valve, 4 is the fine-tuning corrugated membrane box, 5 is the standard air pressure output port, 6 is the standard pressure gauge port, 7 is the compressed air input port, 8 9 is a pressure cut-off valve, and 10 is a three-way connector.

When using the present invention to realize high-precision pressure transmitter calibration, the standard pressure output interface is connected to the pressure transmitter to be calibrated, the standard pressure gauge interface is connected to the standard gauge, and the compressed air input port is connected to the compressed air source. Then adjust the constant value device so that the output pressure of the constant value device is properly higher than the upper limit of the pressure transmitter to be verified. Close the needle vent valve, open the pressure cut-off valve according to the display of the standard pressure gauge, and adjust the pressure to rise to near the required pressure value. Adjust the adjustable bellows diaphragm to make the displayed value of the standard pressure gauge accurate to the required pressure value. Close the pressure cut-off valve, and open the needle-shaped vent valve to adjust the pressure to drop to near the required pressure value according to the standard pressure gauge. Adjust the adjustable bellows diaphragm to make the displayed value of the standard pressure gauge accurate to the required pressure value.

Due to the adoption of the above technical solution, the beneficial effect of the present invention is: using the present invention to perform calibration of high-precision pressure transmitters can effectively utilize existing standard equipment to achieve the purpose of relatively economical calibration of high-precision pressure transmitters.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the implementation scope of the present invention; if it does not depart from the spirit and scope of the present invention, any modification or equivalent replacement of the present invention shall be covered by the claims of the present invention. within the scope of protection.

Claims (9)

1. A simple and high-precision pressure transmitter calibration device, including a frame, a needle-type vent valve, a corrugated membrane box that can be fine-tuned, a standard air pressure output interface, a standard pressure gauge interface, a compressed air input interface, a constant value device, and a pressure cut-off Valve, three-way connector; it is characterized in that it also includes installation and fixing holes, the needle-shaped vent valve, the corrugated membrane box that can be fine-tuned, standard air pressure output interface, standard pressure gauge interface, compressed air input interface, constant value device, pressure a shut-off valve disposed on the frame, Further, the compressed air input interface is connected with the constant value device, Further, the constant value device is connected with the pressure cut-off valve, Further, the pressure cut-off valve is connected with the three-way connector, Further, the three-way connector is connected to the standard pressure gauge interface, Further, the three-way connector is connected with the finely adjustable bellows bellows, Further, the finely adjustable bellows bellows is connected to the standard air pressure output interface. 2. According to claim 1, characterized in that there are installation and fixing holes on both sides of the frame. 3. The device according to claim 1 or 2, characterized in that the frame has an interface with the pressure input. 4. The simple and high-precision pressure transmitter calibration device according to claim 3, characterized in that the compressed air input interface is connected to the constant value device. 5. The simple and high-precision pressure transmitter calibration device according to claim 4, wherein the constant value device is connected with the pressure cut-off valve. 6. The simple and high-precision pressure transmitter calibration device according to claim 5, characterized in that the pressure cut-off valve is connected with the adjustable bellows diaphragm. 7. The simple and high-precision pressure transmitter calibration device according to claim 6, characterized in that the adjustable bellows capsule is connected to the interface of the standard gauge. 8. A simple high-precision pressure transmitter calibration device and its implementation method according to any one of claims 1-6, characterized in that it comprises the following steps: 1) The standard pressure output port is connected to the pressure transmitter to be calibrated, 2) The standard pressure gauge interface is connected to the standard gauge, 3) The compressed air input port is connected to the compressed air source, 4) Adjust the constant value device so that the output pressure of the constant value device is properly higher than the upper limit of the range of the pressure transmitter to be verified. 5) Close the needle vent valve, open the pressure cut-off valve according to the standard pressure gauge and adjust the pressure to rise to near the required pressure value, Adjust the adjustable bellows diaphragm to make the display value of the standard pressure gauge accurate to the required pressure value, 6) Close the pressure cut-off valve, open the needle vent valve according to the standard pressure gauge to adjust the pressure to drop to near the required pressure value, Adjust the adjustable bellows diaphragm to make the display value of the standard pressure gauge accurate to the required pressure value, Further, steps 5) and 6) can be repeated until different precise pressure values required by the pressure transmitter are verified. 9. The simple and high-precision pressure transmitter calibration device and its implementation method according to claim 7, characterized in that: the different precise pressure values required for the calibration of the pressure transmitter are determined by the sealed pressure sensor in the adjustable corrugated membrane box air provided.