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Trial Verification Procedure for Diaphragm Pressure Gauges
JJG 573
Trial Verification Procedure for Diaphragm Pressure Gauges
Verification Procedure for Cepenle Fresaure Gauges-.-++-+---+-
IJ: 573—-1988
This verification procedure was approved by the State Administration for Industry and Commerce on January 3, 1988 and is effective from May 1, 2001. Responsible unit: Shanghai Municipal Standards and Family Planning Administration Bureau Drafting unit: Shanghai Municipal Technical Research Institute The technical provisions of this procedure shall be interpreted by the drafting unit. The main drafters of this regulation are:
(Shanghai Institute of Metrology Technology)
Dai Yunhua
Zhu Shichang
【[Shanghai Metrology Technology Research]
Technical requirements
Determination of conditions
Starting and determining the project tasks and methods
Risk determination and conclusion treatment and determination of the same period
Trial verification procedure for diaphragm pressure gauge
This verification procedure is suitable for newly manufactured, commonly used and source-processed diaphragm pressure gauges of type 1604P. The product is self-service air pressure gauges, and the technical points of the preparation method are given to make the diaphragm pressure gauges! The
box is a simple small test box used for gas media. It can pressurize the gas medium to a full level (single limit alarm) or a full level (return alarm). When the measured gas is working properly, the membrane will elastically deform and the box will move naturally. The pull rod drives the transmission mechanism to rotate, and the pointer indicates the rising pressure on the scale center, which is also called position control.
2 Technical requirements
1 Appearance
1.1 The instrument should be made of semi-assembled parts and should not be moved; the outer shell of the instrument should be firm and can ensure that the internal parts are not contaminated or dirty.
1.2 There should be no visible rust or indentation on the outer shell of the instrument. The layers and surfaces should be smooth and shiny. 1.3 The instrument should have the following markings on the scale: small unit number (1), single digit, scale factor, quality grade, number, name, instrument number, instrument and center of gravity. The scale line should be clear and not broken. 1.4
1.5 The indicating end of the pointer should be within -3cm of the scale and surface. The meter glass should have no markings on the length of the
meter surface, and other points should be protected from theft within the indicated value. 1.7 The non-deformable instrument adjustment device should be flexible and reliable. 1.8 The instrument's combustion data and joints should be free of costly and expensive items. 1.0 The meter's printing or calibration records should be intact. The basic requirements for the meter's accuracy should comply with the requirements of Table 1. Table 1
consumption
question setting
yuan technical limit (from the original fraction) + 4
I real wave level
The range error of the instrument should not be less than the allowable error when the absolute value of the new use road
The range of the instrument should not be too large to allow the reading of the value of 111G2
Six Xu this request (with the share of the micro-branch request!
5 The deflection level
When the continuous increase and decrease, the pointer should be stable and will not stagnate. (The contact point of the table should also meet the following requirements. 2
Stone. 1 It is recommended to remove the setting point of the good digging point and replace it with the standard in Table 2
6.2 Set the travel market
Clear home point medical flower| |tt||The instrument is of the type that everyone knows
The adjustment range of the instrument setting pointer shall not be less than 9% (595% of the measuring range), and the maximum range of the setting pointer shall not be less than % of the measuring range. The minimum gain is not greater than 6.3 Insulation resistance
The insulation resistance of the instrument shall not be less than 2011.
6.4 Insulation resistance
After manufacturing and repair, the meter shall be inspected for 30V and 150V insulation resistance, 1-, and the current and frequency phenomena to be compared are:
II. Verification conditions
Specification of the setting|| tt||7.1 Standard instrument
The absolute value of the basic error of the standard instrument shall be less than 3% of the absolute value of the basic error of the instrument under test: 7.2 Other equipment
7.2.1 Pressure generator that can uniformly increase or decrease the pressure: 2.2 Seals, connection tickets and other special "meters": 7.2.3 2.5-level non-ohmmeter with rated DC power of 500V: 7.2.4 The frequency is 5u, the output power is less than 1500V, the AC power is not more than 0.25kVAK, the rated power is 20±0.8%; the relative humidity is not more than 85%; 9bzxz.net
The meter should be installed in a horizontal position with a normal Normal working position configuration: 1. The power supply of the instrument is 220V+1%
4. Verification items and methods
11. External inspection
Only the appearance of the instrument is used, and it meets the requirements of Article 1 of this regulation. 12. Other verification
12.1 Under certain conditions, make the instrument compare with the standard instrument, and the verification diagram is shown in the figure. 12.2. Verification points
Carry out positive and reverse travel verification on the scale with the value numbers. 12.3. Adjust the zero condition
Before verification: Under the pressure condition, the pressure can be adjusted to the fast scale. In the process of calibration, it is necessary to set the zero position for adjustment.
12.4 Calibration sequence
Use the pressure-raising method to make the pressure gauge and the standard data pressurize to the first calibration point at the same time, and then increase the pressure. When the calibration point is reached, read the standard value and the value indicated by the gauge first. After the pressure gauge is operated, let the minimum value of the calibration instrument be set, and increase each calibration point in turn until the upper limit of measurement is reached. At this time, cut off the pressure source, stay at the measuring limit for 3 minutes, and then reduce the pressure to the calibration point. Calibration process, return to the starting point, each calibration point still needs to be lightly lighted, and the front piece is performed twice.
Each calibration point The basic error before and after or after the instrument is determined by the following formula, and its value shall not exceed the allowable basic error of the instrument: PPx100%
Wherein: The basic error of the instrument during calibration (1): User——Instrument indication value
P——Standard indicated pressure value (Pa);
PInstrument rate a
13 Same-trip error calibration
1-Standard instrument: 2 Note::
At a fixed point between the two sets of pressures, the difference between the two pressure values read after tapping the outer casing of the instrument for increase and decrease is taken as the return error. The return error structure of each fixed point shall comply with the requirements of Article 3 of this regulation. 14 Light displacement calibration
At a fixed calibration point, tap the gauge case lightly during pressurization and depressurization. The difference between the two pressure values before and after reading is the tapping displacement of each calibration point. Both should comply with the requirements of Article 4 of this Regulation..Pointer deflection stability calibration
Use one month to carefully observe the pointer deflection. It should be stable without jumping or strapping. Pointer setting range calibration
Adjustment point setting range should comply with the requirements of clause 6.2 of the specification, 17
Set point error calibration
17.1 For two-piece regulating instruments, the set point error calibration should be carried out near two points: 25%: 50%, 75% of the meter range: For three-position measuring instruments, the set point error calibration should be carried out only at a point near 50% and 75% of the meter range: For instruments with a lower limit, the set point error calibration should be carried out at a point near 25%-50% of the meter range.
17.2 For instruments with upper and lower limit contacts, the upper and lower limit contacts are calibrated separately. 17. Determination of upper switching value (Xz) and lower switching value (X,) The setting needle is set to the set point (value) by a corrector or special tool. The voltage generator used makes the instrument and the standard instrument increase the pressure slowly and evenly until the contact point is activated and output. At this time, the upper switching value () is read on the standard instrument, and then the pressure is slowly and evenly reduced from there until the voltage point is activated. At this time, the pressure value read on the standard instrument again is called the lower switching value (×)
17.4: The error of the set point is the difference between the lower switching value and the delay value. The value is non-regressive.Greater than the allowable basic error of the meter, 18 switching difference is the difference in the position of the lower stroke for the same set of inputs, that is, X,). None of them shall be greater than the absolute allowable basic error of 1164
19 Insulation network verification
The meter does not pass the working voltage. The meter measures the insulation between the power terminal and the ground, the power terminal and the output terminal, and the connection terminal and the output terminal respectively. The values shall not be less than 20M020 Insulation quality standard
The meter does not pass the working voltage. The power terminal is connected to the ground gradually, the power terminal is connected to the battery terminal, and the battery terminal is connected to the input terminal. The battery terminal is connected to the input terminal. The test voltage is 1500V, and it is maintained at [minim] to reduce the breakdown and resistance phenomenon. The test voltage is reduced to 150V to reduce the power supply. 5. Verification result processing and verification cycle
21 All qualified instruments shall be stamped or verified: the instruments that are not qualified shall be issued with an annual card to the verification station. 22 The verification cycle of the instrument shall not be extended by more than one year. 1165
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