JP2001066210A - Pressure measuring device and pressure calibrating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To create constant pressures of different values, and to realize an automatic calibration by using a stepwise generated constant known pressure by equalizing a known pressure enclosed in a pressure holding container to a pressure in a container held at an atmospheric pressure. SOLUTION: Equalizing of a pressure of a pressure holding container 201 to that of a pressure holding container 202 and releasing of the pressure of the container 202 to the atmosphere are repeated to stepwise reduce the pressure in a closed system constituted of a pressure sensor 102, the containers 201 and 202, the measured and theoretical pressure values of the respective steps are found, a linearity regulating table is updated in the direction ion which both values are matched, thus regulating the linearity. Since a calibrating pressure of high possibility can be generated in the pressure measuring device 100, it is not necessary to periodically send and calibrate the device 100 to an organization having a pressure calibrating facility. If the device 100 is a constituting unit of a pressure measuring system, a worker can calibrate the pressure while remaining setting as a pressure measuring system.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure measuring device capable of highly accurate pressure calibration inside a pressure measuring device.

[0002]

2. Description of the Related Art FIG.
And a high-precision pressure measuring device 2 calibrated with higher accuracy than the device under test 10 as shown in FIG.
At the same time, the pressure P is applied to 0, the two indicated values are compared, and the zero adjustment unit, the span adjustment unit, and the linearity adjustment unit provided in the pressure measurement device 10 to be calibrated are adjusted in a direction in which the two indicated values match. Was going by.

As shown in FIG. 6, there is also a method of calibrating the pressure measurement device 10 to be calibrated using a weight type pressure gauge using a weight whose weight has been strictly measured in advance. In the figure, the weight 31 whose mass is strictly measured is placed on a piston 32 having a diameter D inserted into a cylinder 33. The cylinder 33 and the pressure measuring device 10 to be calibrated are connected by a pressure pipe 34, and the pressure pipe 34 is pressurized by a pressure Pe.

The piston 32 inserted into the cylinder 33 is
The pressure pipe 34 floats by being pressurized with the pressure Pe,
A pressure P is generated in the cylinder 33. At this time, the pressure P is generated, is determined by the equation P = W × (π × D 2/4) (1). At this time, the magnitude W of the force is a value obtained by multiplying the total mass of the piston 32 and the weight 31 by the gravitational acceleration at that point.

Utilizing this, in the pressure calibration method shown in FIG. 6, various weights P are generated by combining weights 31 having various masses, and the theoretical pressure value obtained by the above equation (1) is obtained. And the indicated values of the pressure measurement device 10 to be calibrated, and by adjusting the zero adjustment means, the span adjustment means, and the linearity adjustment means provided in the pressure measurement device 10 to be calibrated in a direction in which the two indicated values coincide with each other, Calibration was being performed.

[0006]

However, in the conventional calibration method, calibration is performed by matching a high-accuracy pressure measuring device with a pressure-measuring device to be calibrated, or a reference pressure calibrated with high accuracy is calibrated by the pressure-measuring device. Since it is necessary to input to the measuring device, there is a problem that it is necessary to periodically send the pressure measuring device to be calibrated to a calibration institution equipped with a calibration facility to perform calibration.

If the pressure measuring device to be calibrated is a constituent device of the pressure measuring system, the calibration operator must remove the pressure measuring device set as the pressure measuring system and set again after the calibration is completed. There was a problem that it had to be done.

An object of the present invention is to solve the above problems and to provide a pressure measuring device capable of highly accurate pressure calibration inside the pressure measuring device.

[0009]

A pressure measuring means for measuring a pressure applied from a pressure input port, a first shut-off valve for shutting off the pressure input port, and a first for inputting an inlet pressure of the pressure measuring means. Pressure holding container, a second shut-off valve for shutting off the input of the first pressure holding container, a second pressure holding container for inputting the pressure of the first pressure holding container, and the second pressure holding A third shutoff valve for shutting off the input of the container, and the second shutoff valve;
And a control circuit for controlling the pressure measurement means and the first to fourth shut-off valves.

According to such a configuration, since the pressure of the gas confined in the pressure holding container is extremely constant, the gas is confined in the first pressure holding container, and the pressure value is measured. , A known pressure P1 that is very constant can be created. Next, the first
The known pressure P1 confined in the pressure holding container is equalized with the pressure in the second pressure holding container held at the atmospheric pressure, so that the pressure P2 is a very constant value different from the pressure P1. Can be produced. The value of the pressure P2 generated here can be obtained by calculation from the volumes of the first pressure holding container and the second pressure holding container and the measured value of the pressure P1 measured first.

[0011] The pressure P2 generated here is confined in the first pressure holding container, and the second pressure P2 held at atmospheric pressure is confined.
By pressure equalizing with the pressure in the pressure holding container, a very constant pressure P3 having a value different from the pressure P2 can be produced. Since the pressure P3 can be obtained by the same calculation as described above, such a pressure equalizing operation is repeated a plurality of times, so that a known pressure that is extremely constant is created stepwise in the first pressure holding container. It becomes possible. In this way, it is possible to realize automatic calibration of the pressure measuring device using a very constant known pressure generated stepwise inside the pressure measuring device.

In the pressure measuring device of the present invention, the communication device using the Internet technology is provided, so that the pressure measuring device can be remotely controlled from a remote place. At the same time, remote automatic calibration can be performed.

[0013] Further, the first to fourth embodiments may be arranged as described above.
By using an inexpensive solenoid valve having a simple structure as the shut-off valve, it is possible to improve the reliability of the pressure measuring device and to suppress the manufacturing cost.

According to a seventh aspect of the present invention, in the pressure calibrating apparatus, the weight type pressure generator, the first pressure holding container for inputting the pressure generated by the weight type pressure generator,
A second shut-off valve for shutting off the input of the pressure holding container, a second pressure holding container for inputting the pressure of the first pressure holding container, and a third shutting off the input of the second pressure holding container. A shutoff valve, a fourth shutoff valve for releasing the pressure of the second pressure holding container, a pressure output port for calibration for outputting the pressure of the second pressure holding container to the pressure measurement device to be calibrated, and the pressure measurement Means and a control circuit for controlling the second to fourth shut-off valves.

[0015] According to such a configuration, utilizing the fact that the stable pressure generation, which is a feature of the weight type force generator, and that the pressure of the gas confined in the pressure holding container is extremely constant, the weight is used. The known pressure generated by the mold force generator is equalized between the first pressure holding container and the second pressure holding container by using the same method as the pressure measuring device of the above-described claim 1, thereby making the pressure extremely high. It is possible to generate a constant known pressure stepwise. In this way, it is possible to realize a pressure calibrating device capable of generating a highly accurate calibration pressure using an extremely constant known pressure generated stepwise.

Also, the second to fourth aspects may be as described in claim 8.
By using an inexpensive solenoid valve having a simple structure as the shut-off valve, it is possible to improve the reliability of the pressure calibration device and to reduce the manufacturing cost.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a configuration diagram of a pressure measuring device according to the present invention. In the figure, components performing the same operations as those of the conventional example are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 1, a pressure input port 101 is connected to a first shut-off valve 111, and an output of the first shut-off valve 111 is connected to a pressure sensor 102 used as pressure measuring means.

The output of the first shut-off valve 111 and the pressure sensor 1
The second shut-off valve 112 is connected to the pressure pipe L1 of 02, and the output of the second shut-off valve 112 is connected to the first pressure holding container 201.

The first pressure holding container 201 is connected to a second pressure holding container 202 via a third shutoff valve 113.

The second pressure holding container 202 is open to the outside air via a fourth shutoff valve 114.

The pressure signal obtained from the pressure sensor 102 is numerically processed by the control circuit 103 and displayed on a display means (not shown) as a measured pressure value. Further, the control circuit 103 includes the first to fourth shutoff valves 111 to 114.
And a zero point correction value for performing a zero point adjustment, a span correction value for performing a span adjustment, and a linearity adjustment table for performing a linearity adjustment. Further, the control circuit 103 includes a communication unit 104 having a web server function.

When measuring the pressure applied to the pressure input port 101 in the pressure measuring apparatus 100 having such a configuration, the control circuit 103 opens the first shutoff valve 111 and sets the second shutoff valve 112. After closing, the pressure signal obtained from the pressure sensor 102 is numerically processed to obtain a pressure measurement value, which is displayed on a display means (not shown).

Here, the pressure measuring device 1 having such a configuration is described.
The calibration method of 00 will be described below.

First, when the zero point adjustment is performed in the pressure measuring device 100, the control circuit 103 controls the first shutoff valve 11
1 is closed, and the second shut-off valve 112, the third shut-off valve 113, and the fourth shut-off valve 114 are opened. By setting these shut-off valves in such a state, the pressure sensor 102 is opened to the atmosphere. Therefore, the control circuit 103 measures the pressure at this time as zero pressure.

Next, the control circuit 103 updates the stored zero point correction value in a direction in which the measured value obtained here becomes zero. This completes the zero point adjustment.

When the span adjustment is performed in the pressure measuring device 100, the control circuit 103 controls the first shut-off valve 11
2 is closed and the first shut-off valve 111 is opened. At this time, the calibration operator changes the strictly specified span pressure to the pressure input port 10.
Apply to 1. The control circuit 103 measures the pressure at this time, and updates the stored span correction value in the direction in which the measured value obtained here matches the span pressure value. This completes the span adjustment.

Next, the operation for adjusting the linearity in the pressure measuring device 100 will be described with reference to the flowchart of FIG.

The control circuit 103 opens the first shut-off valve 111 and the second shut-off valve 112, closes the third shut-off valve 113, and controls the pressure applied to the pressure input port 1 to the pressure sensor 102 and the 1 is introduced into the pressure holding container 201. The pressure introduced at this time is desirably a pressure near the span pressure of the pressure measurement device 10 to be calibrated. (ST1)

The control circuit 103 measures the pressure value at this time by the pressure sensor 102 and stores this pressure as a pressure value P1. (ST2)

Next, the control circuit 103 controls the first shut-off valve 1
11 is closed and the introduced pressure P1 is
2 and the first pressure holding container 201 are sealed. (ST3)

Next, the control circuit 103 controls the fourth shutoff valve 1
14 is closed, the third shut-off valve 113 is opened, and the pressures of the first pressure holding container 201 and the second pressure holding container 202 are equalized.
At this time, the internal pressure Ps1 of the first pressure holding container 201 and the second pressure holding container 202 was measured, and this was measured.
3 is stored. The theoretical value Pr1 of the internal pressure Ps1 at this time is:
Assuming that the relationship between the volume V1 of the first pressure holding container 201 and the volume V2 of the second pressure holding container 202 is V2 = α × V1, P1 × V1 = Pr1 × V2 (2): Pr1 = (1 + α) ) × V1, Pr1 = P1 / (1 + α) (3) (ST4)

Next, the control circuit 103 controls the third shutoff valve 1
13 is closed, the fourth shutoff valve 114 is opened, and the internal pressure of the second pressure holding container 202 is released to the atmosphere. (ST5)

The control circuit 103 counts the number of times of equalization, and compares the count value nex with a predetermined number of equalization times nc. At this time, the count value n
If ex is smaller than the specified equalizing frequency value nc, the process returns to ST4, and after equalizing again, the internal pressure Psn is measured, and the theoretical value Prn is obtained and both are stored. The theoretical value Pr at this time
n can be obtained by Prn = P1 / (1 + α) ^n-1 (4) where n is the number of times of pressure equalization. If the count value nex is equal to or larger than the specified atmospheric release nc, the process proceeds to ST7. (ST
6)

The control circuit 103 opens the third shut-off valve 113 and the fourth shut-off valve 114 and sets the first pressure holding vessel 201
And the internal pressure of the second pressure holding container 202 is released, and ST5 and S
The internal pressure Psn obtained at T6 is compared with the theoretical value Prn, and the stored linearity adjustment table is updated in a direction in which the two coincide with each other. (ST7)

That is, in the pressure measuring device of the present invention, ST
Steps 5 to ST6 are repeated nc times to equalize the pressure of the first pressure holding container 201 with the pressure of the second pressure holding container 202, and then repeatedly discharge the pressure of the second pressure holding container 202 to the outside air. With the pressure sensor 1
02, a first pressure holding container 201, and a second pressure holding container 202, the pressure is gradually reduced in a closed system, and a pressure measurement value and a theoretical value for each stage are obtained. The linearity adjustment is performed by updating the linearity adjustment table in the matching direction.

Since the temperature inside the pressure measuring device 100 needs to be constant during the above-described linearity adjustment period, for example, an electric heater or the like having a temperature control function is installed in the pressure measuring device 100. It is desirable to keep the temperature inside the device constant.

Further, since the pressure measuring device 100 of the present invention includes the communication means 104 having a web server function, the above-described calibration procedure can be remotely controlled, and the range of the pressure measuring device 100 can be switched. It is possible to perform operations such as starting and stopping from a remote location.

Here, the communication means 104 provided in the pressure measuring device 100 of the present invention will be described. Communication means 104
Has an Internet server function and is connected to a local area network (not shown) or directly to the Internet (not shown). Also, software (hereinafter referred to as application software) that operates as an application in an Internet browser for causing the control circuit 103 to execute the above-described calibration procedure is installed.

A client computer (not shown) provided at a remote location is, for example, a WWW (World Wid
e (Web) browser and an Internet browser such as HTTP (Hyper Text Transfer Protocol)
Communication with the communication means 104 is performed using a protocol such as l). That is, in such a connection form, the client computer connected to the Internet is a client-side computer, and the communication means 104 (the pressure measuring device 100) is a server.

Therefore, for example, when the application software of the communication means 104 is obtained from a client computer via a browser and is executed on the client computer, a graphical user interface is provided to an operator operating the client computer, Can use this to interact with the communication means 104 (pressure measurement device 100).

For example, when an address corresponding to the application software of the communication means 104 (pressure measuring device 100) is designated from the browser screen of the client computer, a screen for controlling the above-described calibration procedure is displayed, and the operator operates this screen. The pressure calibration described above can be remotely controlled.

Further, in the pressure measuring device 100 of the present invention,
By providing the communication means 104 having such a configuration,
It is possible to perform remote control such as start-stop of the pressure measuring device 100 and range switching, and it is possible to notify an alarm of the pressure measuring device 100 to a client computer by using an e-mail technology.

Further, it is possible to realize a pressure calibration device capable of calibrating a pressure measurement device with high accuracy by utilizing the advantages of the above-described technique and a weight type pressure gauge capable of generating stable pressure. . FIG. 3 is a configuration diagram of such a pressure calibration device. It should be noted that in FIG.
The same reference numerals are given and the description is omitted.

In FIG. 3, the pressure input port 301 for pressurization is connected to the cylinder 302, and the cylinder 302 is connected to the second shut-off valve 112. This second shut-off valve 112
Is connected to the first pressure holding vessel 201.
The pressure input port 301 for pressurization is pressurized by the pressure Pe.

The first pressure holding container 201 is connected to the second pressure holding container 202 via the third shutoff valve 113.

The second pressure holding container 202 is open to the outside air via a fourth shutoff valve 114. The second pressure holding container 202 is connected to the pressure output port for calibration 303, and the pressure output port for calibration 303 is connected to the pressure measurement device 10 to be calibrated.

The weight 305 whose mass is strictly measured in FIG.
On the piston 304.

The driving means 306 for rotating the piston 304 is connected to the piston 304, and the cylinder 302 is provided with a fiber photoelectric switch 308 for detecting the position of the piston 304. The detection signal of the fiber photoelectric switch 308 is transmitted to the control circuit 307.

The above-described cylinder 302, piston 304, weight 305, driving means 306, and fiber photoelectric switch 308 constitute a weight-type pressure generator 320.

The control circuit 307 controls the second to fourth shut-off valves 112 to 114 and the driving means 306,
The calibration pressure value output from the calibration pressure output port 303 is calculated and displayed on a display means (not shown).

A method of calibrating the pressure calibrating apparatus 300 having such a configuration will be described below.

First, when adjusting the zero point of the pressure measuring device 10 to be calibrated, the control circuit 307 controls the third shut-off valve 113.
Is closed, and the fourth shutoff valve 114 is opened. By setting the two shut-off valves in such a state, the pressure input port of the pressure-measuring device 10 to be calibrated is opened to the atmosphere.
Adjust the zero point of.

Next, when adjusting the span of the pressure measuring device 10 to be calibrated, the control circuit 307 controls the second shutoff valve 112
Then, the third shutoff valve 113 is opened, and the fourth shutoff valve 114 is closed. At this time, the worker applies pressure Pe to the pressure input port 201 for pressurization using a hand pump or the like,
And the weight 305 is lifted.

When the floating of the piston 304 and the weight 305 is detected by the fiber photoelectric switch, the control circuit 307 applies a rotational force to the piston 304 by the driving means 306 to stably float the piston 304. At this time, a pressure P1 is generated inside the cylinder 302.

At this time, the pressure P1 generated depends on the diameter of the piston 304 as D, the piston 32 and the weight 3 as in the conventional example.
When the total mass of the magnitude of the force obtained by multiplying gravity acceleration of the location of 1 is W, determined by the equation P1 = W × (π × D 2/4) (5).

The control circuit 307 displays the theoretical pressure value P1 obtained by the above equation (5) on the display means.

The operator adjusts the weight or the pressure Pe of the weight 305 and obtains the theoretical pressure value P1 from the pressure measuring device 10 to be calibrated.
And the pressure measurement device 1 to be calibrated
By comparing the indicated value of 0, the span of the pressure measurement device 10 to be calibrated is adjusted.

Next, the operation for adjusting the linearity in the pressure measuring device 100 will be described with reference to the flowchart of FIG.

The control circuit 307 opens the second shut-off valve 112, closes the third shut-off valve 113, and generates the pressure P1 inside the cylinder 302 in the same procedure as the span adjustment. It is desirable that the pressure P1 generated at this time should match the span pressure of the pressure measurement device 10 to be calibrated.
When only the linearity is adjusted, an appropriate pressure value near the span pressure may be used. (ST1)

Next, the control circuit 307 controls the second shutoff valve 1
12 is closed, and the pressure P1 is sealed in the first pressure holding container 201. (ST2)

Next, the control circuit 307 controls the fourth shutoff valve 1
14, the internal pressure of the second pressure holding container 202 is released. (ST3)

Next, the control circuit 307 controls the fourth shutoff valve 1
14 is closed, the third shut-off valve 113 is opened, and the pressures of the first pressure holding container 201 and the second pressure holding container 202 are equalized.
The theoretical value Pr1 of the internal pressure Ps1 at this time is, as in the description of FIG. 2, assuming that the relationship between the volume V1 of the first pressure holding container 201 and the volume V2 of the second pressure holding container 202 is V2 = α × V1. , Pr1 = P1 / (1 + α) (6) The operator compares the theoretical pressure value Prn obtained here with the indicated value of the pressure measurement device 10, and updates the linearity adjustment table of the pressure measurement device 10 in such a direction that the deviation between them becomes zero. (ST4)

Next, the control circuit 307 controls the third shutoff valve 1
13 is closed, the fourth shutoff valve 114 is opened, and the internal pressure of the second pressure holding container 202 is released to the atmosphere. (ST5)

The control circuit 307 counts the number of times of pressure equalization, and compares the count value nex with a predetermined specified number of times of pressure equalization nc. At this time, the count value n
If ex is smaller than the specified equalizing frequency value nc, the process returns to ST4, after equalizing again, measures the internal pressure Psn and obtains the theoretical value Prn. Update the linearity adjustment table. The theoretical value Prn at this time can be obtained by the following equation, where n is the number of times of equalization, and Prn = P1 / (1 + α) ^n-1 (7). If the count value nex is equal to or larger than the specified atmospheric release nc, the linearity adjustment ends. (ST6)

That is, in the pressure measuring device of the present invention, a highly accurate calibration pressure is generated by the weight type pressure generator 320, and the obtained configuration pressure is converted from ST5 to ST6 by n.
By repeating c times, the first pressure holding vessel 201
The pressure sensor 102, the first pressure holding container 201, and the second pressure holding container 202 are repeatedly pressure-equalized with the second pressure holding container 202, and thereafter, the pressure of the second pressure holding container 202 is released to the outside air. The pressure is reduced stepwise in a closed system constituted by the pressure holding vessel 202, and the pressure measurement value and the theoretical value at each stage are obtained, and the linearity adjustment of the pressure measurement device 10 to be calibrated is performed in a direction in which the two match. Update the table and adjust the linearity.

Since the temperature in the pressure calibration device 300 needs to be constant during the above-described linearity adjustment period, for example, an electric heater or the like having a temperature control function is installed in the pressure calibration device 300, It is desirable to keep the temperature inside the device constant.

[0068]

It should be noted that the foregoing description has been directed to specific preferred embodiments for the purpose of illustration and illustration of the invention. Therefore, the present invention is not limited to the above-described embodiments, and includes many more modifications without departing from the spirit thereof.
This includes deformation.

[0070]

As is apparent from the above description,
According to the present invention, the following effects can be obtained. According to the first aspect of the present invention, since it is possible to generate a highly accurate calibration pressure inside the pressure measurement device, it is necessary to periodically send the pressure measurement device to an organization having pressure calibration equipment to perform calibration. Disappears. Further, when the pressure measuring device is a constituent device of the pressure measuring system, the calibration operator can perform the pressure calibration while being set as the pressure measuring system. Therefore, the load on the calibration operator can be significantly reduced.

Further, in the pressure measuring device of the present invention, by providing communication means using the Internet technology, it is possible to remotely control the pressure measuring device from a remote place. At the same time, remote automatic calibration can be performed.

According to the sixth aspect of the present invention, by using an inexpensive solenoid valve having a simple structure as the first to fourth shut-off valves, the reliability of the pressure measuring device can be improved and the manufacturing cost can be reduced. Becomes possible.

According to the sixth aspect of the present invention, a stable pressure generation characteristic of the weight type force generator and the fact that the pressure of the gas confined in the pressure holding vessel is extremely constant are utilized. It is possible to realize a pressure calibration device capable of generating a stable calibration pressure.

According to the seventh aspect of the present invention, by using an inexpensive solenoid valve having a simple structure as the second to fourth shut-off valves, the reliability of the pressure calibration device is improved and the manufacturing cost is reduced. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a pressure measuring device according to the present invention.

FIG. 2 is a flowchart illustrating an operation of the pressure measuring device according to the present invention.

FIG. 3 is a configuration diagram showing one embodiment of a pressure calibration device according to the present invention.

FIG. 4 is a flowchart illustrating the operation of the pressure calibration device according to the present invention.

FIG. 5 is a configuration diagram showing an example of a conventional pressure measuring device.

FIG. 6 is a configuration diagram showing an example of a conventional weight type pressure measuring device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Constructed pressure measuring device 20 High-accuracy pressure measuring device 100 Pressure measuring device 111, 112, 113, 114 Shut-off valve 101 Pressure input port 102 Pressure sensor 103, 307 Control circuit 320 Weight type pressure generator 301 Pressure input port for pressurization 33, 302 Cylinder 303 Calibration pressure output port 32, 304 Piston 31, 305 Weight 306 Driving means

Claims (8)

[Claims] 1. A pressure measuring means for measuring a pressure applied from a pressure input port, a first shutoff valve for shutting off the pressure input port, and a first pressure holding vessel for inputting an inlet pressure of the pressure measuring means. A second shut-off valve for shutting off an input to the first pressure holding container; a second pressure holding container for inputting a pressure of the first pressure holding container; and an input for the second pressure holding container. A third shutoff valve for shutting off the pressure, a fourth shutoff valve for releasing the pressure of the second pressure holding container, and a control circuit for controlling the pressure measuring means and the first to fourth shutoff valves. A pressure measuring device, characterized in that: 2. The pressure measuring device according to claim 1, wherein the control circuit includes a communication unit. 3. The communication device according to claim 3, wherein said communication means has an Internet server function, and is configured to be able to remotely control a higher-level device connected to the Internet via a web browser. Data recording device as described. 4. The data recording apparatus according to claim 4, wherein the web browser uses a WWW browser. 5. The data recording apparatus according to claim 4, wherein the remote control function is configured to be able to issue an alarm notification by e-mail. 6. The pressure measuring device according to claim 1, wherein said first to fourth shut-off valves are solenoid valves. 7. A weight type pressure generator, a first pressure holding container for inputting a pressure generated by the weight type pressure generator, and a second shutoff for shutting off input to the first pressure holding container. A valve and a second pressure holding container for inputting the pressure of the first pressure holding container; a third shutoff valve for shutting off the input of the second pressure holding container; and a pressure of the second pressure holding container. A fourth shutoff valve to be opened; a pressure output port for calibration for outputting the pressure of the second pressure holding container to the pressure measurement device to be calibrated; controlling the pressure measuring means and the second to fourth shutoff valves A pressure calibration device, comprising: 8. The pressure measuring device according to claim 1, wherein the second to fourth shut-off valves are solenoid valves.