JP5661543B2 - Diaphragm pressure gauge calibration device - Google Patents

Description

  The present invention relates to a diaphragm pressure gauge calibration apparatus. In particular, the present invention relates to a structure of an apparatus for calibrating a diaphragm type pressure gauge that receives a fluid to be measured by a diaphragm and measures the pressure of the fluid.

  In plants such as nuclear power plants and thermal power plants, many pipes are laid to transfer various fluids such as liquids and gases. In these plants, various fluids and gases are stored in a container such as a tank. In these plants, pressure gauges for measuring the pressures of these fluids are arranged everywhere. And a plant can be operated safely and reliably by managing a plant appropriately based on the data measured with the pressure gauge.

  In a power plant such as a nuclear power plant, a diaphragm type pressure gauge is used as a pressure gauge. The diaphragm type pressure gauge includes a pressure gauge main body having an indicator, a capillary tube in which a liquid is sealed, a diaphragm (diaphragm) for receiving a fluid to be measured. The pressure gauge main body includes one having a communication function capable of transmitting the measured pressure data.

  For example, a fluid to be measured is introduced into an introduction pipe branched from a pipe through which the fluid flows, and a diaphragm of a diaphragm type pressure gauge is disposed at a closed end of the introduction pipe. The pressure received by the diaphragm is transmitted to the main body of the pressure gauge through the capillary tube, and the pressure of the fluid flowing through the pipe is measured. Since the diaphragm type pressure gauge seals the fluid to be measured with the diaphragm, the contact between the fluid and the outside air can be avoided, and for example, there is an advantage that corrosion of the pressure gauge main body can be prevented.

  At nuclear power plants, etc., calibration of diaphragm type pressure gauges is carried out regularly. This calibration work is performed as follows, for example. First, the main valve (open / close valve) provided on the branch side of the introduction pipe is closed to block outflow of fluid.

  Next, a hat-shaped detection pipe with a diaphragm attached to the bottom surface of the recess is removed from the end of the introduction pipe. Normally, the end part of the introduction pipe and the detection pipe are connected with each other through the packing, so that the detection pipe can be removed from the end part of the introduction pipe by removing the bolts and nuts that fasten these flanges. Can be removed. In this case, the pressure gauge main body is connected to the detection pipe via a capillary tube.

Next, after removing the fluid remaining in the detection pipe, calibration work is performed. In this calibration work, the detection pipe is sealed in advance with a hat body (cap body) having the same shape as the detection pipe. Next, the diaphragm is filled with a gas such as N ₂ (nitrogen) gas or air from the hat body side, and calibration is performed by pressurizing the diaphragm. The pressure of the gas sent from the hat body side is varied while being measured by a manometer (for example, a mercury column pressure gauge) as a standard device (reference device), and the indicated value of the manometer is compared with the indicated value of the pressure gauge body. The diaphragm pressure gauge is calibrated.

  By the way, the series of calibration operations described above require disassembly work of the end portion of the introduction pipe and the detection pipe, and also requires reassembly work of the end portion of the introduction pipe and the detection pipe. It has become necessary. In particular, in the nuclear power plant, the once removed packing was replaced with a new one without being reused, which was problematic in terms of cost.

  In order to eliminate such a problem, a diaphragm pressure gauge calibration apparatus that can calibrate the pressure gauge body with the diaphragm pressure gauge attached to the plant has been disclosed (for example, see Patent Document 1).

Japanese Utility Model Publication No. 61-167538

  FIG. 3 is a diagram showing a configuration of a diaphragm pressure gauge calibration device according to Patent Document 1, FIG. 3A is a piping diagram of the diaphragm pressure gauge calibration device, and FIG. 3B is a diaphragm type. It is a longitudinal cross-sectional view of the diaphragm type displacement device for calibration with which the calibration apparatus of a pressure gauge is equipped. 3A of the present application corresponds to FIG. 1 of Patent Document 1, and FIG. 3B of the present application corresponds to FIG. 2 of Patent Document 1.

  Referring to FIG. 3A, a calibration device 70 for a diaphragm type pressure gauge according to Patent Document 1 includes a cylindrical calibration diaphragm type replacer (hereinafter abbreviated as a replacer) 7, a capillary tube 71, and a pressure gauge. A main body 72 is provided. A fluid flows through the pipe 1. The pipe 1 is connected to the introduction pipe 11. The fluid to be measured can be introduced into the introduction pipe 11 from the pipe 1.

  Referring to FIG. 3 (A), a substitution device 7 is connected to the end of the introduction tube 11. A main valve (open / close valve) 1 a is provided on the pipe 1 side of the introduction pipe 11. When the main valve 1a is closed, the conduit of the introduction pipe 11 can be shut off. That is, when the main valve 1 a is closed, it is possible to prevent the fluid from being introduced from the pipe 1 toward the replacer 7, and it is possible to prevent the fluid from flowing backward from the replacer 7 toward the pipe 1.

  Referring to FIG. 3A, the introduction pipe 11 is provided with a pressure relief valve (open / close valve) 1 b between the main valve 1 a and the replacer 7. When the main valve 1a is opened and the pressure relief valve 1b is closed, the introduction pipe 11 can be closed circuit (fluid circuit). On the other hand, when the main valve 1a is closed and the pressure relief valve 1b is opened, the fluid remaining in the introduction pipe 11 between the main valve 1a and the replacer 7 can be made the same pressure as the atmospheric pressure, and again the pressure relief valve 1b is turned on. When closed, the remaining fluid can be stored at atmospheric pressure.

  Referring to FIG. 3B, the replacer 7 is provided with a pair of flanges 71f and 72f at both ends. The opening provided at the center of one flange 71f is sealed with a first diaphragm (diaphragm) 7a. The opening provided in the central portion of the other flange 71f is sealed with a second diaphragm (diaphragm) 7b. That is, the replacer 7 is a sealed container.

  Referring to FIG. 3B, the replacer 7 encloses an incompressible fluid (for example, pure water) inside. When the incompressible fluid is sealed inside, the replacer 7 has a vent hole 73 for venting air at the top. The replacer 7 has a drain hole 74 for discharging the internal drain at the bottom. The vent hole 73 and the drain hole 74 are normally sealed.

  Referring to FIG. 3, the flange 71 f is coupled to a flange provided at the end of the introduction pipe 11. Then, the fluid introduced into the introduction pipe 11 is received by the first diaphragm 7a. On the other hand, the flange 72 f is coupled to a flange provided at the end of the capillary tube 71. The pressure fluctuation of the second diaphragm 7 b is transmitted to the internal liquid of the capillary tube 71. That is, the fluid pressure in the pipe 1 is transmitted through the path of the first diaphragm 7a → the internal fluid of the replacer 7 → the second diaphragm 7b → the capillary tube 71 → the pressure gauge body 72, and the fluid pressure in the pipe 1 is transmitted to the pressure gauge body. Measured at 72.

  Referring to FIG. 3, the diaphragm pressure gauge calibration device 70 according to Patent Document 1 further includes a calibration pipe 81, a test valve (open / close valve) 8 a, and a pressurizing device 9. One end of the calibration pipe 81 is connected to a port 75 p provided in the replacer 7. The other end of the calibration pipe 81 is connected to the test valve 8a. The pressurizing device 9 can connect the plug 9a to the test valve 8a, introduce the fluid for calibration into the replacer 7, and change the internal pressure of the replacer 7. The pressure gauge main body 72, the test valve 8 a, and the pressurizing device 9 are installed at a location different from the replacer 7 with the wall W therebetween.

  With reference to FIG. 3, the pressure gauge main body 72 is calibrated as follows. First, the main valve 1a is closed, then the pressure relief valve 1b is opened, and the fluid remaining in the introduction pipe 11 between the main valve 1a and the replacer 7 is brought to the same pressure as the atmospheric pressure, and then the pressure relief valve Close 1b. Next, the pressure gauge main body 72 can be calibrated by connecting the plug 9a to the test valve 8a, opening the test valve 8a, and changing the internal pressure of the displacement device 7 by the pressurizing device 9.

  The diaphragm type pressure gauge calibration device according to Patent Document 1 is capable of calibrating the pressure gauge body in a state of being attached to a plant and simplifying the configuration.

  However, the diaphragm pressure gauge calibration apparatus according to Patent Document 1 calibrates the pressure gauge body by changing the internal pressure of the displacement device. Referring to FIG. 3, the calibration device 70 of the diaphragm type pressure gauge according to Patent Document 1 receives the fluid introduced from the pipe 1 by the first diaphragm 7a, and the calibration result is the characteristic of the first diaphragm 7a. Therefore, there is a problem that it is difficult to reflect the pressure fluctuation of the fluid flowing through the pipe 1 with good reproducibility.

  There is a need for a calibration device capable of reflecting the pressure fluctuation of the measured fluid with good reproducibility in the diaphragm type pressure gauge that receives the fluid to be measured by the diaphragm and measures the pressure of the fluid with the main body of the pressure gauge. The above can be said to be the subject of the present invention.

  The present invention has been made in view of such a problem, and can be used to calibrate a pressure gauge body in a state of being attached to a plant, and can reflect pressure fluctuations of a measured fluid with good reproducibility. An object of the present invention is to provide a calibration apparatus.

  The inventor receives the fluid with a diaphragm disposed at the end of the introduction pipe into which the fluid to be measured is introduced, and the pressure received by the diaphragm is transmitted to the pressure gauge main body through the capillary tube, and the fluid In the diaphragm type pressure gauge that measures the pressure of the fluid, the calibration fluid is introduced into the calibrator interposed in the closed circuit between the diaphragm and the main valve with the main valve that opens and closes the flow path of the introduction pipe closed However, it is thought that this problem can be solved by calibrating the pressure gauge body by varying the pressure of the calibration fluid received by the diaphragm, and based on this, the following new diaphragm pressure It came to invent the calibration device of a meter.

  (1) A diaphragm type pressure gauge calibration apparatus according to the present invention is arranged so as to close a terminal valve for opening and closing a flow path of an introduction pipe into which a fluid to be measured is introduced, and closing the end of the introduction pipe. A diaphragm type pressure gauge calibration apparatus having a diaphragm for receiving pressure, and a pressure gauge body in which pressure received by the diaphragm is transmitted through a capillary tube, wherein the diaphragm and the original are closed with the original valve closed. A cylindrical calibrator is provided that is interposed in a closed path between the valves, communicates the flow path of the introduction pipe and the diaphragm, and has a calibration chamber that can be filled with a calibration fluid that pressurizes the diaphragm.

  (2) The diaphragm type pressure gauge calibration apparatus according to the present invention includes a calibration pipe detachably connected to the calibrator, and the calibration fluid via the calibration pipe with the original valve closed. A calibration fluid source that fills the calibration chamber, and a reference device that is connected to the calibration pipe and measures the pressure with which the calibration fluid pressurizes the diaphragm, and the pressure of the calibration fluid source It is preferable to calibrate the indicated value of the pressure gauge main body based on the indicated value of the reference device.

  (3) A diaphragm pressure gauge calibration apparatus according to the present invention includes a first flange provided on a distal end side of the introduction pipe, and a central portion closed by the diaphragm, and is detachably connectable to the first flange. A second flange, wherein the calibrator is sandwiched between the first flange and the second flange, communicates with the calibration chamber so that the calibration fluid can be introduced, and is connected to the calibration pipe. It is preferable to have a connection port.

  (4) It is preferable that the calibrator has a drain hole through which the drain staying in a closed path between the main valve and the diaphragm can be discharged via the calibration chamber.

  (5) It is preferable that the calibrator has a sealing plug capable of sealing at least one of the connection port and the drain hole.

  (6) It is preferable that the calibration pipe further includes a pressure relief valve connected between the calibration fluid source and the calibrator.

  (7) The calibrator is preferably made of stainless steel.

  (8) The diaphragm pressure gauge calibration method according to the present invention is arranged so as to close the inlet pipe into which the fluid to be measured is introduced, a main valve for opening and closing the flow path of the inlet pipe, and the end of the inlet pipe. A diaphragm pressure gauge having a diaphragm for receiving the fluid, and a pressure gauge body in which the pressure received by the diaphragm is transmitted through a capillary tube, and a calibration pipe connected between the main valve and the diaphragm; A calibration fluid source for filling the closed circuit between the original valve and the diaphragm with the calibration fluid via the calibration pipe in a state where the original valve is closed, and the calibration pipe connected to the calibration pipe. And a reference device for measuring pressure at which the fluid pressurizes the diaphragm, and a calibration method for a diaphragm type pressure gauge using a calibration device, wherein the pressure of the calibration fluid source is fluctuated, and an indication value of the reference device Calibrate the indicated value of the pressure gauge body based on .

  The calibration device for a diaphragm type pressure gauge according to the present invention receives the fluid by a diaphragm disposed at the end of an introduction pipe into which a fluid to be measured is introduced, and the pressure received by the diaphragm is received through the capillary tube. In the diaphragm type pressure gauge that measures the pressure of the fluid, the calibrator of the calibrator interposed in the closed circuit between the diaphragm and the main valve in a state where the main valve that opens and closes the flow path of the introduction pipe is closed. The pressure gauge body can be calibrated by introducing a calibration fluid inside and changing the pressure of the calibration fluid received by the diaphragm, so the calibration result is the pressure of the fluid to be measured, taking the characteristics of the diaphragm into account. Variations can be reflected with good reproducibility.

  The diaphragm type pressure gauge calibration apparatus according to the present invention is sandwiched between a first flange provided on the distal end side of the introduction pipe and a second flange closed at the center by the diaphragm, and the flow path of the introduction pipe and the diaphragm It has a calibrator that has a calibration chamber inside, and the calibrator is connected to the calibration chamber and has a connection port to which calibration piping can be introduced so that the calibration fluid can be introduced. The pressure gauge body can be calibrated.

It is a piping diagram which shows the structure of the calibration apparatus of the diaphragm type pressure gauge by one Embodiment of this invention, and has described the principal part essence. It is a perspective exploded view of a calibrator provided in the calibration device for a diaphragm type pressure gauge according to the embodiment and components connected to the calibrator. It is a figure which shows the structure of the calibration apparatus of the diaphragm type pressure gauge by a prior art, FIG. 3 (A) is a piping diagram of the calibration apparatus of a diaphragm type pressure gauge, FIG. 3 (B) is the calibration apparatus of a diaphragm type pressure gauge. It is a longitudinal cross-sectional view of the diaphragm type displacement device for calibration with which it is equipped.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of diaphragm pressure gauge calibration device]
First, the configuration of a diaphragm pressure gauge calibration device according to an embodiment of the present invention will be described.

  FIG. 1 is a piping diagram showing a configuration of a calibration device for a diaphragm type pressure gauge according to an embodiment of the present invention, and principally describes the main part. FIG. 2 is a perspective exploded view of a calibrator provided in the diaphragm pressure gauge calibration apparatus according to the embodiment and components connected to the calibrator. In addition, since the operation | movement of the component which has the same code | symbol used in FIG. 3 is the same, description may be omitted below.

  Referring to FIG. 1, a diaphragm type pressure gauge calibration device (hereinafter referred to as a calibration device) 10 according to an embodiment of the present invention includes a cylindrical calibrator 3, a capillary tube 21, and a pressure gauge body 22. . A fluid flows through the pipe 1. The pipe 1 is connected to the introduction pipe 11. The fluid to be measured can be introduced into the introduction pipe 11 from the pipe 1.

  Referring to FIG. 1, a calibrator 3 is connected to the end of the introduction tube 11. A main valve (open / close valve) 1 a is provided on the pipe 1 side of the introduction pipe 11. When the main valve 1a is closed, the conduit of the introduction pipe 11 can be shut off. That is, when the main valve 1 a is closed, it is possible to prevent the fluid from being introduced from the pipe 1 toward the calibrator 3, and to prevent the fluid from flowing backward from the calibrator 3 toward the pipe 1.

  Referring to FIG. 2, as a substance, a first flange 11 f is provided on the distal end side of the introduction pipe 11. The first flange 11f has a plurality of holes 11b for fastening with bolts 5b and nuts 5n. On the other hand, a second flange 21 f is provided at one end of the capillary tube 21. The second flange 21f has a plurality of holes 21b for fastening with bolts 5b and nuts 5n.

  Referring to FIG. 1 or FIG. 2, the opening provided in the central portion of the second flange 21f is sealed with a diaphragm 2d. An incompressible fluid is sealed inside the diaphragm 2d. The pressure received by the diaphragm 2d is transmitted to the pressure gauge main body 22 via the capillary tube 21, and the pressure gauge main body 22 measures the pressure.

  Referring to FIG. 1 or FIG. 2, conventionally, the first flange 11f and the second flange 21f are directly connected. The pressure of the fluid flowing through the pipe 1 was measured by the pressure gauge main body 22. For this reason, when the pressure gauge main body 22 is calibrated, the first flange 11f and the second flange 21f are disassembled, and the diaphragm 2d is pressurized with a calibration fluid to perform calibration. Further, after the calibration work was completed, the first flange 11f and the second flange 21f were assembled again. The calibration apparatus 10 according to the embodiment solves the above-described calibration work which is complicated and takes time as follows.

  Referring to FIG. 2, the calibrator 3 has a plurality of holes 31b through which the bolts 5b are inserted. The calibrator 3 is fastened with bolts 5b and nuts 5n so as to be sandwiched between the first flange 11f and the second flange 21f. That is, the calibrator 3 is interposed in a closed circuit between the diaphragm 2d and the main valve 1a with the main valve 1a closed.

  Referring to FIG. 1, the calibrator 3 has a calibration chamber 30 in communication with the flow path of the introduction tube 11 and the diaphragm 2d. The calibration chamber 30 can be filled with a calibration fluid G that pressurizes the diaphragm 2d. The calibrator 3 is preferably made of stainless steel and can prevent corrosion.

  Referring to FIG. 1, the diaphragm pressure gauge calibration device 10 according to the embodiment further includes a calibration pipe 41, a calibration fluid source 4d, and a reference device 4a. One end of the calibration pipe 41 is connected to the calibrator 3 so as to communicate with the calibration chamber 30.

  Referring to FIG. 2, as a matter of fact, a pipe joint 41 c provided at the end of the calibration pipe 41 is connected to a connection port 31 p communicating with the calibration chamber 30. That is, the calibration pipe 41 is connected between the main valve 1a and the diaphragm 2d (see FIG. 1).

Referring to FIG. 1, a calibration fluid source 4 d is connected to the far end of the calibration pipe 41. The calibration fluid source 4d is, as a substance, a tank (or a cylinder) that stores a calibration fluid G such as N ₂ (nitrogen) gas and opens the on-off valve 4c connected to the calibration pipe 41 for calibration. The fluid G can be filled in the calibration chamber 30 (see FIG. 2). And in the state which closed the main valve 1a, the diaphragm 2d can be pressurized with the fluid G for calibration.

  Referring to FIG. 1, the reference pipe 4 a is connected to the calibration pipe 41. The reference device 4a is, for example, a manometer, and can measure the pressure at which the calibration fluid G pressurizes the diaphragm 2d. The pressure value of the pressure gauge main body 22 can be calibrated based on the value indicated by the reference device 4a by changing the pressure of the calibration fluid source 4d.

  With reference to FIG. 1 or FIG. 2, the calibrator 3 opens a drain hole 32 p communicating with the calibration chamber 30. The drain hole 32p can discharge the drain accumulated in the closed path between the main valve 1a and the diaphragm 2d together with the fluid to be measured.

  1 or 2, the calibrator 3 has a sealing plug 3n that can seal at least one of the connection port 31p and the drain hole 32p. Normally, the pipe joint 41c is connected to the connection port 31p, and after the drain is discharged, the drain hole 32p is sealed with the sealing plug 3n. The pipe joint 41c can also be connected to the drain hole 32p. In this case, the connection port 31p can be sealed with the sealing plug 3n.

  Referring to FIG. 1, the calibration pipe 41 further includes a pressure relief valve 4b connected between the calibration fluid source 4d and the connection port 31p. When the main valve 1a is closed and the pressure relief valve 4b is opened, the fluid staying in the closed circuit between the main valve 1a and the diaphragm 2d can be made the same pressure as the atmospheric pressure, and when the pressure relief valve 1b is closed again, The closed fluid between 1a and the diaphragm 2d can be filled with the calibration fluid G at a pressure higher than atmospheric pressure.

[Operation of calibration device for diaphragm type pressure gauge]
Next, the operation and effect of the calibration device 10 will be described while explaining a calibration method using the calibration device 10 according to the embodiment.

  With reference to FIG. 1, first, the main valve 1a is closed, the drain hole 32p is opened, and the drain accumulated in the closed circuit (including the calibration chamber 30) between the main valve 1a and the diaphragm 2d is measured together with the fluid to be measured. Discharge. In this case, it is preferable to open the pressure relief valve 4b so that the drain is easily discharged, and the drainage of the drain may be accelerated by blowing the calibration fluid G. And after draining, the drain hole 32p is sealed with the sealing plug 3n.

  Referring to FIG. 1, next, the on-off valve 4c is opened, and the calibration fluid G is filled in the closed circuit between the main valve 1a and the diaphragm 2d. In addition, it is preferable to make the said closed circuit into the state of atmospheric pressure once before opening the on-off valve 4c. Next, the pressure of the calibration fluid G is varied, and the indicated value of the pressure gauge body 22 received by the diaphragm 2d is calibrated based on the indicated value of the reference device 4a. After the calibration work is completed, the connection port 31p is sealed with the sealing plug 3n, and the main valve 1a is opened to return to the normal measurement state.

  In the calibration method using the calibration device 10 according to the embodiment, the fluid is received by the diaphragm 2d disposed at the end of the introduction pipe 11 into which the fluid to be measured is introduced, and the pressure received by the diaphragm 2d is passed through the capillary tube 21. In the diaphragm type pressure gauge that is transmitted to the pressure gauge main body 22 and measures the pressure of the fluid, the main valve 1a that opens and closes the flow path of the introduction pipe 11 is closed, and the gap between the diaphragm 2d and the main valve 1a is closed. The pressure gauge main body 22 can be calibrated by introducing the calibration fluid G into the closed circuit (including the calibration chamber 30) and changing the pressure of the calibration fluid G received by the diaphragm 2d.

  Since the calibration device 10 according to the embodiment can calibrate the pressure gauge body in a state of being attached to the plant, it is possible to omit the conventional disassembly work and reassembly work of the flange accompanying the calibration. In addition, the calibration device 10 according to the embodiment has a special effect that the fluctuation result of the fluid flowing through the pipe 1 can be reflected with good reproducibility because the calibration result takes into consideration the characteristics of the diaphragm 2d.

  The calibration device 10 according to the embodiment discloses a preferred example for calibrating the pressure of the fluid flowing through the pipe, but the diaphragm pressure gauge calibration device and calibration method according to the present invention are not limited thereto. For example, the diaphragm pressure gauge calibration apparatus according to the present invention can be connected to a tank for storing pressure fluid, a pump for delivering fluid, or the like.

1a Main valve 2d Diaphragm 3 Calibrator 4a Reference unit 4d Calibration fluid source 10 Calibration device (calibration device for diaphragm type pressure gauge)
11 Introduction pipe 11f 1st flange 21 Capillary tube 21f 2nd flange 22 Pressure gauge body G Fluid for calibration

Claims (6)

A fluid to be measured is introduced, and an introduction pipe provided with a first flange on the end side,
A cylindrical calibrator having a calibration chamber communicating with the flow path of the introduction pipe inside and fastened to the first flange;
Using a plurality of bolts and nuts, and a second flange for sandwiching the calibrator with the first flange,
The introduction pipe has a main valve for opening and closing the flow path,
The second flange is
A diaphragm for sealing the opening provided in the central portion and receiving the fluid,
A pressure gauge body in which the pressure received by the diaphragm is transmitted through a capillary tube,
The calibrator is
Calibration piping that is detachably connected to the calibrator,
A calibration fluid source that fills the calibration chamber with a calibration fluid through the calibration pipe with the original valve 1a closed;
A reference device connected to the calibration pipe and measuring the pressure with which the calibration fluid pressurizes the diaphragm;
The calibration fluid communicates with the calibration chamber so that the calibration fluid can be introduced, and has a connection port to which the calibration pipe is connected;
A diaphragm type pressure gauge calibration apparatus that varies the pressure of the calibration fluid and calibrates the indicated value of the pressure gauge body based on the indicated value of the reference device.   2. The diaphragm type pressure gauge calibration apparatus according to claim 1, wherein the calibrator has a drain hole through which the drain staying in a closed circuit between the main valve and the diaphragm can be discharged via the calibration chamber.   The diaphragm type pressure gauge calibration apparatus according to claim 2, wherein the calibrator includes a sealing plug capable of sealing at least one of the connection port and the drain hole.   The diaphragm type pressure gauge calibration apparatus according to claim 1, wherein the calibration pipe further includes a pressure relief valve connected between the calibration fluid source and the calibrator.   5. The diaphragm pressure gauge calibration device according to claim 1, wherein the calibrator is made of stainless steel. A cylinder into which a fluid to be measured is introduced and which has an introduction pipe provided with a first flange on the end side and a calibration chamber communicating with the flow path of the introduction pipe and is fastened to the first flange And a second flange that sandwiches the calibrator with the first flange using a plurality of bolts and nuts, and the introduction pipe has a main valve that opens and closes the flow path. The second flange has an opening provided at a central portion thereof, and has a diaphragm for receiving the fluid, and a pressure gauge body to which the pressure received by the diaphragm is transmitted via a capillary tube, The calibrator includes a calibration pipe that is detachably connected to the calibrator, and a calibration fluid that fills the calibration chamber with the calibration fluid through the calibration pipe with the main valve 1a closed. Connected to the calibration pipe and the calibration fluid A reference device which measures the pressure applied to the diaphragm, the communicating the calibration fluid can be introduced calibration chamber, the calibration device of the diaphragm-type pressure meter using with a connection port for the calibration pipe is connected A calibration method,
A diaphragm pressure gauge calibration method in which the pressure of the calibration fluid source is varied and the indicated value of the pressure gauge body is calibrated based on the indicated value of the reference device.

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