CN205719399U - A kind of assay device of piston gage piston effective area - Google Patents

Abstract

The utility model discloses the assay device of a kind of piston gage piston effective area, including standard piston, digital pressure gauge, presser unit, piston-type pressure meter systems and several counterweights；Described standard piston and fixed piston to be checked are loaded on piston-type pressure meter systems；Described counterweight is placed on described standard piston or fixed piston to be checked；Described presser unit is pressurizeed to described piston-type pressure meter systems；Described digital pressure gauge is loaded on described piston-type pressure meter systems, with the pressure suffered by measurement standard piston or fixed piston to be checked.This utility model is by adding and subtracting the counterweight of equal increments on standard piston and fixed piston to be checked, and then obtain the increment of the pressure of corresponding standard piston and fixed piston to be checked, thus obtain the effective area of piston gage piston, it is not necessary to repeatedly add and subtract miniweights, greatly improve work efficiency.

Description

A kind of assay device of piston gage piston effective area

Technical field

This utility model relates to measurement verification field, particularly relates to the calibrating of a kind of piston gage piston effective area Device.

Background technology

Piston gage, as the standard metrology appliance of pressure measurement transmission of quantity value, has class of accuracy high, stable Property good, measure the advantage such as wide ranges.Based on above-mentioned advantage, legal metering validation activity general the most all using piston gage as society The public measurement criteria of meeting, carries out legal transmission of quantity value work in the range of administration；And general enterprises and institutions also can select Piston gage, as the maximum pressure measurement criteria of our unit, carries out transmission of quantity value work in our unit.According to metering The requirement of method, the piston gage standard of both the above character broadly falls into the measurement instrument of compulsory verification, so, piston type Piezometer value accurate and effective is traced to the source particularly significant.

According to the requirement of State Administration of Quality Supervision, Inspection and Quarantine, the magnitude tracing mode of piston gage needs according to national metrological verification regulations JJG59-2007 examines and determine；This code is formulated based on R1101994 (E) " piston manometer " international recommendation, by piston-type pressure The calibrating of the effective area of meter is as the committed step of magnitude tracing.At present, existing piston effective area calibration method is usual Use direct balanced method or initial counterbalanced procedure.Both approaches essence is identical, the while of being all by fixed piston to be checked and standard piston Loading or be connected in same verification system by pipeline, swing weight-adding on fixed piston to be checked and standard piston, makes respectively On fixed piston to be checked and standard piston, pressure experienced (by force) is equal to reach dynamic equilibrium, it is thus achieved that place under dynamic balance state Counterbalance mass on fixed piston to be checked and standard piston, it is known that the effective area (tracing to the source to higher standard) of standard piston； Calculate finally according to formula and obtain the manometric piston effective area of fixed piston formula to be checked.

The formula principle using direct balanced method or initial counterbalanced procedure calibrating piston gage piston effective area is as follows:

The fundamental formular of piston gage piston effective area calibrating is as follows:

$A=\frac{mg}{P}$

Wherein, the effective area of A: piston gage；M: counterbalance mass during balance；G: acceleration of gravity；P: during balance The pressure being applied on piston gage；

Pressure owing to applying on fixed piston to be checked and standard piston is equal, i.e. P=P'；Therefore when fixed piston to be checked and When standard piston reaches dynamic balance state, available formula is as follows:

$\frac{A}{A^{\′}}=\frac{m}{m^{\′}}$

Deriving further, the effective area formula that can obtain the manometric piston of fixed piston formula to be checked is as follows:

$A^{\′}=\frac{m^{\′}}{m}A$

Wherein, A, A': represent standard piston and the effective area of fixed piston to be checked；M, m': when expression reaches dynamic equilibrium, It is added in the counterbalance mass on standard piston and fixed piston to be checked respectively；P, P': represent when reaching dynamic equilibrium, standard piston and treating The pressure that calibrating piston is respectively subjected to.

Finally, lived by added counterbalance mass and standard on standard piston under acquisition dynamic balance state and fixed piston to be checked The effective area of plug, can calculate the acquisition manometric effective area of fixed piston formula to be checked further according to above-mentioned formula.

But, when using direct balanced method or initial counterbalanced procedure that piston gage piston effective area is examined and determine, operation Difficulty is big, and the requirement to testing person is higher.During because using direct balanced method or initial counterbalanced procedure calibrating, examining and determine In journey, most important step is to make standard piston and fixed piston to be checked reach dynamic equilibrium, though P=P', and piston gage Sensitivity the highest, need repeatedly to add and subtract miniweights for reaching dynamic equilibrium, and need repeatedly to adjust, waste time and energy, work effect Rate is the highest；And during this swing weight-adding, standard piston and fixed piston to be checked also to keep the position each worked, all Rotating with the speed of (30-60) r/min, this just considerably increases the difficulty of operation.Additionally, be also more highly important, live May decline with certain speed when plug reaches dynamic equilibrium, this needs verification worker empirically to judge with knowledge, slightly Carelessness is had to be possible to cause result of calculation to have relatively large deviation with actual.

Utility model content

This utility model is to overcome the shortcoming of prior art with not enough, it is provided that one need not to add and subtract miniweights, simple Practical, raising work efficiency, can realize the device examining and determine piston gage piston effective area.

This utility model is achieved through the following technical solutions: the calibrating of a kind of piston gage piston effective area Device, including standard piston, digital pressure gauge, presser unit, piston-type pressure meter systems and several counterweights；Described standard is lived Plug and fixed piston to be checked are loaded on piston-type pressure meter systems；Described counterweight is placed on described standard piston or fixed piston to be checked On；Described presser unit is pressurizeed to described piston-type pressure meter systems；Described digital pressure gauge is loaded in described piston-type pressure On meter systems, with the pressure suffered by measurement standard piston or fixed piston to be checked.

Compared to prior art, this utility model is by being loaded in standard piston, fixed piston to be checked and digital pressure gauge On same piston-type pressure meter systems, and on standard piston and fixed piston to be checked, add and subtract the counterweight of equal in quality, make to be placed on Standard piston is identical with the increment of the counterweight on fixed piston to be checked, and then it is alive only need to obtain standard accordingly by digital pressure gauge The increment of the pressure of plug and fixed piston to be checked, so that it may obtain piston gage piston effective area, it is not necessary to judge two-piston Reach balance, it is not required that plus-minus miniweights the most simultaneously so that common staff can complete be pressure to piston in respect of The calibrating of effect area, simple and practical, substantially increase work efficiency.

Further, a data acquisition process unit is also included；Described digital collection processing unit and described digital pressure Meter connects and receives the pressure signal that described digital pressure gauge transmits.

Further, the sensor in described digital pressure gauge is quartz resonance pressure sensor.

In order to be more fully understood that and implement, describe this utility model below in conjunction with the accompanying drawings in detail.

Accompanying drawing explanation

Fig. 1 is the structural representation of the assay device of this utility model piston gage piston effective area.

Detailed description of the invention

Referring to Fig. 1, it is the structural representation of assay device of this utility model piston gage piston effective area Figure.The assay device of this piston gage piston effective area, including standard piston 1, piston-type pressure meter systems 2, precompressed Unit 3, presser unit 4, several counterweights 5, digital pressure gauge 6 and data acquisition process unit 7.

Described standard piston 1 and fixed piston to be checked 8 are loaded on described piston-type pressure meter systems 2.Described prepressing units 3 Pressurize to described piston-type pressure meter systems 2 with presser unit 4, so that described standard piston 1 or fixed piston to be checked 8 are pressed.Institute State counterweight 5 to be placed on described standard piston 1 or fixed piston to be checked 8, so that described standard piston 1 or fixed piston to be checked 8 are in Operating position also keeps certain clockwise direction to rotate, and then makes described standard piston 1 or fixed piston to be checked 8 reach balance. Described digital pressure gauge 6 is loaded on described piston-type pressure meter systems 2, and by the standard piston 1 measured or fixed piston to be checked 8 Suffered pressure signal is sent to described digital collection processing unit 7.

Described piston-type pressure meter systems 2 be provided with respectively with described standard piston 1, fixed piston to be checked 8, digital pressure gauge 6, the standard piston valve 21 that prepressing units 3 connects with presser unit 4, fixed piston valve 22 to be checked, digital pressure gauge valve 23, Prepressing units valve 24 and presser unit valve 25.

In the present embodiment, the sensor in described digital pressure gauge 6 is quartz resonance pressure sensor.Quartz resonance pressure Sensor possesses excellent year stability and the high linearity and repeatability, especially error in the range of certain measurement Little, it is possible to realize accuracy of reading, equal to the piston gage of same precision.

In this utility model, the pressure medium of making used in described piston-type pressure meter systems is liquid or gas, respectively Corresponding to piston-type pressure meter systems gentle body piston-type pressure meter systems, the two system is referred to as piston by this utility model Formula manometer systems.

The assay device of the piston gage piston effective area that the utility model proposes, fixed piston 8 to be checked and standard Piston 1 can be simultaneously attached on piston-type pressure meter systems 2, because during the calibrating of fixed piston to be checked 8 and standard piston 1 Independent calibrating, it is only necessary to guarantee to be carried in fixed piston 8 to be checked identical with the increment of the quality of the counterweight on standard piston 1 i.e. Can.

The most first introduce the assay device that the utility model proposes for examining and determine piston gage piston effective area Ultimate principle:

Fundamental formular according to the calibrating of piston gage piston effective areaUnderstand, when adding and subtracting on piston Counterweight 5 increment when changing, the increment being correspondingly applied to the pressure on piston also can proportionally change.Cause This, the fundamental formular of piston gage piston effective area can be exchanged into:

$A=\frac{\mathrm{\Δ}mg}{\mathrm{\Δ}P}$

It is to say, add and subtract counterweight 5 (the same set of counterweight of equal in quality on standard piston 1 and fixed piston to be checked 8 respectively 5), make to be placed on standard piston 1 identical with the increment of the counterweight on fixed piston 8 to be checked, by obtaining standard piston 1 He accordingly The increment of the pressure of fixed piston 8 to be checked, so that it may obtaining piston gage piston effective area, the most above-mentioned formula can be further It is derived by equation below:

$\frac{A}{A^{\′}}=\frac{{\mathrm{\ΔP}}^{\′}}{\mathrm{\Δ}P}$

And then the computing formula that can obtain piston gage piston effective area is as follows:

$A^{\′}=\frac{\mathrm{\Δ}P}{{\mathrm{\ΔP}}^{\′}}A$

In above-mentioned formula, △ P, △ P': before and after representing swing weight-adding 5, standard piston 1 and the increasing of fixed piston to be checked 8 pressure Amount；A, A': represent standard piston 1 and the effective area of fixed piston to be checked 8.

The assay device that the utility model proposes is described below for examining and determine the step of piston gage piston effective area Suddenly, specifically comprise the following steps that

Step S1: swing weight-adding 5 on standard piston 1, the increment of counterweight 5 mass of record plus-minus, obtain mark accordingly Quasi-piston 1 reaches the increment △ P of pressure suffered during balance；

Concrete, standard piston 1, digital pressure gauge 6 and fixed piston to be checked 8 are loaded in a piston-type pressure meter systems 2 On, piston-type pressure meter systems 2 arranges a prepressing units 3 and presser unit 4；Digital pressure gauge 6 connects data Acquisition process unit 7.

Open standard piston valve 21, digital pressure gauge valve 23, prepressing units valve 24 and presser unit valve 25, close Close fixed piston valve 22 to be checked.When first pressure spot is examined and determine, standard piston 1 adds and first tested level pressure The counterweight 5 of the corresponding quality in force, by prepressing units 3 first to piston-type pressure meter systems 2 manual pressure, treats that feel is lived In plug manometer systems 2 during existing certain pressure, pressurize by presser unit 4, make piston rise to operating position.Rotate simultaneously Counterweight 5, makes standard piston 1 reach balance and rotate, by data acquisition process list with the clockwise direction of (30-60) r/min Unit 7 obtains now pressure suffered by standard piston 1, the quality of the counterweight 5 that record is now added on standard piston 1.Treat first Calibrating after pressure spot examined and determine, places the counterweight corresponding with second accredited pressure spot on piston, repeats to examine and determine the The step of one calibrating point, makes piston reach same operating position；Simultaneously rotate counterweight 5, make standard piston 1 reach balance and with (30-60) clockwise direction of r/min rotates, and is obtained now suffered by standard piston 1 piezometer by data acquisition process unit 7 Pressure, counterweight 5 mass that is now added on standard piston 1 of record；And then obtain standard piston 1 at first calibrating pressure spot Pressure increment △ P with suffered by second calibrating pressure spot, calculates standard piston 1 in first calibrating pressure spot and second inspection The mass incremental △ m of the counterweight 5 that the timing of constant-pressure spot check is placed.By that analogy, respectively other constant-pressure points to be checked are surveyed Amount and record.

Step S2: according to the method for step S1, swing weight-adding 5 on fixed piston 8 to be checked, makes to add and subtract at fixed piston 8 to be checked The increment of counterbalance mass equal with the increment of counterbalance mass of plus-minus on standard piston 1；Obtain fixed piston 8 to be checked and reach balance Time suffered pressure increment △ P'；The order of addition of counterweight to be ensured is identical with step S1, because different counterweight matter Amount there may be difference.

Concrete, standard of closure piston valve 21, open fixed piston valve 22 to be checked, digital pressure gauge valve 23, precompressed Unit valve 24 and presser unit valve 25.Fixed piston 8 to be checked adds first accredited pressure spot with standard piston 1 The counterweight 5 of corresponding quality, by prepressing units 3 first to piston-type pressure meter systems 2 manual pressure, treats that feel is by piston type In manometer systems 2 during existing certain pressure, pressurize by presser unit 4, make piston rise to operating position.Make standard piston 1 Reach balance and rotate with the clockwise direction of (30-60) r/min, obtaining now standard by data acquisition process unit 7 and live Plug pressure suffered by 1, the quality of the counterweight 5 that record is now added on standard piston 1.Treat that first calibrating pressure spot has been examined and determine After, start second calibrating point is examined and determine, piston-type pressure meter systems 2 increases the counterweight 5 of △ m' mass so that treat The increment of calibrating piston 8 swing weight-adding 5 is equal with the increment of swing weight-adding on standard piston 1, i.e. △ m'=△ m.Pass through data Acquisition process unit 7 obtains the pressure suffered by fixed piston 8 piezometer the most to be checked, and then obtains first of fixed piston 8 to be checked Calibrating pressure spot and second calibrating pressure increment △ P' suffered by pressure spot.By that analogy, respectively to other level pressure forces to be checked Measure and record.

Step S3: obtain the effective area A of standard piston 1；And the significant surface of acquisition fixed piston to be checked is calculated according to formula Long-pending, the computing formula of piston gage piston effective area is as follows:

$A^{\′}=\frac{\mathrm{\Δ}P}{{\mathrm{\ΔP}}^{\′}}A$

In above-mentioned formula, △ P, △ P': represent standard piston 1 and the increment of the pressure suffered by fixed piston to be checked 8 respectively；A, A': represent standard piston 1 and the effective area of fixed piston to be checked 8 respectively.

In instantiation, calibrating environment meets the requirement of vertification regulation JJG 59-2007, and standard piston 1 is measurement scope Being the piston gage of 0.01 grade for (1～60) MPa class of accuracy, tested piston is that the identical measurement scope of 0.05 grade is lived Plug piezometer, use quartz resonance pressure sensor digital pressure gauge 6 be 0.01 grade for class of accuracy, year stability excellent In 0.005%.The data calculated according to above method and record are lived with reference to table 1 piston effective area calibrating initial data and table 2 Plug effective area calibration calculation result is as follows:

Table 1 piston effective area calibrating initial data

Table 2 piston effective area calibration calculation result

From Tables 1 and 2, in the calibration method proposed in the present embodiment, with the difference generation of adjacent calibrating point pressure indicating value For indicating value.And owing to the piston brace rod quality of standard and tested piston is different, the therefore counterbalance mass of first test point Differ, then as the starting point of detection, in subsequent detection, each standard piston and fixed piston to be checked, detection The counterweight increment of point is identical.And carry out piston effective area calibrating by conventional calibration method, it is necessary to consider standard and quilt The uncertainty that inspection piston uses two to overlap counterweights and introduces, and the calibration method proposed in the present embodiment obtains the numerical value of each point Be all same counterweight, it is not necessary to consider the uncertainty that counterweight introduces, and then improve the accuracy of calibrating.

Meanwhile, in the calibration method proposed in this enforcement, each point value is measured three times, finally uses average weighted Method obtains experimental result, improves the accuracy of data, reduces the uncertainty that sporadic factor is brought.Survey owing to increasing Amount number of times can reduce uncertainty, but can increase the time of calibrating, in actual applications, it should comes really according to practical situation The period that regular inspection is fixed.

In view of the data exception that likely occurs, first the data that obtain are determined whether to exist thick by 3 σ rules Error, does not the most find gross error, and owing to each group of data all have certain uncertainty, it is to final result Impact should be relevant with the size of uncertainty, specifically, and square being inversely proportional to of uncertainty, therefore use each Individual piston effective area uses the mode of weighted mean to draw the piston effective area of synthesis.

The 0.01 grade standard piston 1 effective area A passed through metering institute of China National primary standard amount is 0.1001643cm², meter It is 0.100102cm that calculation can obtain the arithmetic mean of instantaneous value of A' in this example², weighted mean is: 0.100099cm²。

While carrying out new method calibrating, in order to obtain the reference data under conventional calibration method, in the survey of repeatability Under the conditions of amount, the tested piston effective area using initial counterbalanced procedure calibrating to obtain is 0.100099cm².Conventional calibration method obtains The data gone out and use the result after new method weighted average after arithmetic point 6 completely the same, two kinds of methods obtain result There is the concordance of height, illustrate that the calibrating using new method to carry out piston effective area is feasible.

Further, the science of the method for the assay device calibrating piston effective area that the utility model proposes for explanation can Row, is evaluated by survey calculation uncertainty, and concrete evaluation process is as follows:

1. (measuring method) general introduction

1.1 beasurement bases: JJG59-2007 " piston gage " vertification regulation

1.2 measurement environment: temperature: (20 ± 1) DEG C；Humidity :≤80%.

1.3 standards and corollary equipment:

0.01 grade of piston gage, measurement scope: (1～60) MPa

0.01 grade of digital pressure gauge (quartz resonance), indication range: (0～60) MPa

1.4 measurands: 0.05 grade of piston gage, measurement scope: (1～60) MPa

1.5 measurement processes:

1) using standard piston pressure gauge detection digital pressure gauge, each test point reading three times, digital pressure gauge is read Number average value P_iIt is P for this test point result, such as first test point₁For 10MPa, last test point P₆For 60MPa, inspection Measuring point is spaced apart 10MPa, if Δ P_i=P_i+1-P_i(wherein i represents the adjacent accredited pressure spot of i-th, i=1,2,3,4,5).2) Using tested piston gage to detect digital pressure gauge, ibid, each some reading uses identical with previous step detecting step Counterweight, Δ P can be obtained equally_i'=P_i'₊₁-P_i' (wherein i represents the adjacent accredited pressure spot of i-th, i=1,2,3,4,5).

2. pattern evaluation:

According to measuring method, the counterbalance mass that each accredited pressure spot adds is essentially equal, it may be assumed that Δ m_i=Δ m_i', and Δm_i=Δ P_i* A, Δ m'_i=Δ P_i' * A', (wherein i represents the adjacent accredited pressure spot of i-th, i=1,2,3. ,) then Set up following mathematical model:

$A^{\′}=A\frac{\mathrm{\Δ}P}{{\mathrm{\ΔP}}^{\′}}---\left(1\right)$

In formula: A' represents the effective area of fixed piston formula manometer piston to be checked, unit cm²；A represents that 0.01 grade standard is lived The effective area of plug manometer piston, unit cm².Set:Then formula (1) becomes:

A'=AM (2)

Due to independent the most uncorrelated between A', A, M, obtain variance:

u²(A')=c²(A)·u²(A)+c²(M)·u²(M) (3)

In formula: c is sensitivity coefficient, respectively c (A)=M；C (M)=A；

By (3) formula left side divided by A'², the right is divided by (AM)²,

u² _rel(A')=u² _rel(A)+u² _rel(M) (4)

What consideration piston system out of plumb was brought affects u_rel(δ₁), ambient temperature affect u_rel(δ₂), then above formula can represent For:

u² _rel(A')=u² _rel(A)+u² _rel(M)+u² _rel(δ₁)+u² _rel(δ₂) (5)

3. uncertainty source analysis

3.1) the standard uncertainty u that input quantity A causes_rel(A)

The standard uncertainty main source that input quantity A causes is that 0.01 grade of piston manometer piston effective area error is drawn Rise, use the evaluation of B class method.

3.2) the standard uncertainty u that input quantity M causes_rel(M)

The standard uncertainty main source that input quantity M causes is replica test and resolution wherein the greater causes, The former uses A class method to evaluate, and the latter uses B class method to evaluate.

3.3) input quantity δ₁The standard uncertainty u caused_rel(δ₁)

Input quantity δ₁The standard uncertainty main source caused is that piston mounting axis out of plumb causes, and uses B class side Method is evaluated.

3.4) input quantity δ₂The standard uncertainty u caused_rel(δ₂)

Input quantity δ₂The standard uncertainty main source caused is that variation of ambient temperature causes, and uses the evaluation of B class method.

4. standard uncertainty evaluation

4.1) the standard uncertainty u that input quantity A causes_rel(A)

This derives from the impact that 0.01 grade of piston effective area brings, it is allowed to deviation is ± 0.006%.Obedience normal state is divided Cloth, k=3, therefore standard uncertainty $u_1=\frac{0.006\%}{3}=0.002\%.$

4.2) the standard uncertainty u that input quantity M causes_rel(M)

This derives from repetition measurement, and 5 result of calculations of M and relative uncertainty degree are respectively as follows: 0.999583, 0.013%；0.999234,0.012%；0.999433,0.008%；0.999367,0.008%；0.999267,0.006%； Weighted arithmetic averageExperimental standard deviation s₁It is calculated as follows:Wherein m=5, t_iFor i The power of secondary measurement result, is inversely proportional to relative uncertainty degree square, can be calculated s₁=0.005%.Digital pressure gauge resolution The partial uncertainty introduced calculates: s₂=0.29 δ/10=0.0029%, s₂<s₁, then s_M=s₁=0.005%.

4.3) input quantity δ₁The standard uncertainty u caused_rel(δ₁)

This impact brought for piston system out of plumb, it is allowed to non-perpendicularity is 5 ＇, Obedience is uniformly distributed, $k=\sqrt{3},$ Therefore relative standard uncertainty $u_3=\frac{{\mathrm{\&delta;}}_1}{k}=\frac{1.1\&times;{10}^{-6}}{\sqrt{3}}=6.4\&times;{10}^{-5}\%.$

4.4) input quantity δ₂The standard uncertainty u caused_rel(δ₂)

Owing to a process of measurement can complete in 1h, laboratory condition can guarantee that temperature within a process of measurement time Variable quantity very little.Therefore the partial uncertainty that variations in temperature introduces can be ignored.

The evaluation of the combined standard uncertainty of the most measured (or output)

Table 3 standard uncertainty component is uniformly distributed catalog

Independent uncorrelated because measuring each amount, then Composite Seismogram is:

$u_{rel}\left(A^{\&prime;}\right)=\sqrt{{u^2}_{rel}\left(A\right)+{u^2}_{rel}(M+{u^2}_{rel}({\mathrm{\&delta;}}_1)+{u^2}_{rel}\left({\mathrm{\&delta;}}_2\right)}=0.0054\%$

6. expanded uncertainty

Measurement scope (1～60) MPa, 0.01 grade of piston gage 0.05 grade of piston-type pressure of calibrating is calculated as: U_rel= ku_rel=0.011%, k=2.

As can be seen here, the assay device that the utility model proposes carries out 0.05 grade of piston effective area calibrating, extends the most true Degree of determining is 0.01%, and the amount biography ratio meeting regulatory requirements requires.

Compared to prior art, this utility model is by being loaded in standard piston, fixed piston to be checked and digital pressure gauge On same piston-type pressure meter systems, and on standard piston and fixed piston to be checked, add and subtract the counterweight of equal in quality, make to be placed on Standard piston is identical with the increment of the counterweight on fixed piston to be checked, and then it is alive only need to obtain standard accordingly by digital pressure gauge The increment of the pressure of plug and fixed piston to be checked, so that it may obtain piston gage piston effective area, it is not necessary to judge two-piston Reach dynamic equilibrium, it is not required that plus-minus miniweights so that common staff can complete piston to be pressure the most simultaneously The calibrating of meter effective area, simple and practical, substantially increase work efficiency.

This utility model is not limited to above-mentioned embodiment, if do not taken off various changes of the present utility model or deformation From spirit and scope of the present utility model, if these are changed and deformation belongs to claim of the present utility model and equivalent technologies Within the scope of, then this utility model is also intended to comprise these changes and deformation.

Claims (4)

1. the assay device of a piston gage piston effective area, it is characterised in that: by standard piston, digital pressure Meter, presser unit, piston-type pressure meter systems and several counterweights composition；Described standard piston and fixed piston to be checked are loaded in work On plug manometer systems；Described counterweight is placed on described standard piston or fixed piston to be checked；Described presser unit is to described Piston-type pressure meter systems pressurizes；Described digital pressure gauge is loaded on described piston-type pressure meter systems, lives with measurement standard Pressure suffered by plug or fixed piston to be checked.

The assay device of piston gage piston effective area the most according to claim 1, it is characterised in that: described number Sensor in word piezometer is quartz resonance pressure sensor.

The assay device of piston gage piston effective area the most according to claim 2, it is characterised in that: also include Prepressing units, described prepressing units is arranged on described piston-type pressure meter systems.

The assay device of piston gage piston effective area the most according to claim 3, it is characterised in that: described work Plug assay device is provided with respectively with described standard piston, fixed piston to be checked, digital pressure gauge, prepressing units and presser unit even Logical standard piston valve, fixed piston valve to be checked, digital pressure gauge valve, prepressing units valve and presser unit valve.