Verification rule
IIG 172'- 1994
How small is it to make it up? Today, two cloth cloth,
It makes people laugh and cry.
Tubular micropressure gauge
JJ G 172- 1994
Not the knife G 172- 1984.
. People' eight pots'} Mengba
Verification regulation of tilt micro-manometer
Validation rules for filtering
prediction
manufacture
prepare
The abbreviation of Ningxia Hui Autonomous Region
ten
prediction
blink
This verification regulation was approved by the State Bureau of Technical Supervision 1994.
Centralized unit: Shanghai Municipal Bureau of Technical Supervision
Drafting unit: Shanghai Institute of Metrology and Technology
The drafting unit shall be responsible for the interpretation of the technical terms of this regulation.
The main drafters of this procedure are:
Tu (Shanghai Institute of Metrology Technology)
Approved on April 5, 2008, and implemented from June 1 994 65438+February1F3.
1 1 14
catalogue
Overview,
Technical requirements?
Verification conditions? ....？ ....,.
Verification items and verification methods? .........., .................
Verification result processing and verification cycle,, .................., ...
Two three four five
appendix
Appendix 1
Appendix 2
Inclinometer verification record? ,?
Gravity acceleration of major cities in China (X)?
1 1 1 6
1 1 1 6
1 1 1 6
] 1 1 7
1 1 1 8
1 1 1 8
1 1 1 8
1 1 1 9
1 1 15
Verification regulation of tilt micro-manometer
This procedure is applicable to the verification of newly manufactured, used and repaired inclinometers (hereinafter referred to as piezometers).
abstract
Micromanometer is a pressure measuring instrument based on hydrostatic principle, which uses the height difference of liquid column to measure pressure. peculiar
The measuring tube whose point is glass is an inclined tube with a certain angle to the horizontal plane. Therefore, a small liquid column height difference can be converted into proportional amplification.
Divided value of
Micromanometer is used to measure the gauge pressure and differential pressure of gas insoluble in ethanol.
technical requirement
1 appearance
1. 1 The parts of the micro-pressure gauge shall be firmly assembled without looseness or damage.
1.2 The glass measuring tube (hereinafter referred to as the measuring tube) of the micro-pressure gauge should have no defects that affect the strength and reading, and the inner wall of the tube should be
Clean.
1.3 The scribed lines on the micro-pressure gauge scale should be straight and clear, and the lengths of the three scribed lines should be clearly identifiable and consistent with the measuring tube.
Vertical centerline; You must not break the line, which will affect reading; The width of the scribe line shall not be greater than 1/So of the minimum indexing distance.
1.4 The figures on the micro-pressure meter should be complete and clear.
1.5 The micro-pressure gauge should be equipped with a level meter, and the table-top micro-pressure gauge should also be equipped with a horizontal adjustment device.
1.6 The multi-way valve of the micro-pressure gauge shall be clearly marked.
1.7 The 0.5-level micro-pressure gauge should have a cursor reading device, which should be able to move smoothly without jamming or sudden movement.
The phenomenon of jumping loose.
LS micropressure meter should have zero adjustment device.
1.9 The micropressure meter shall have a nameplate. The nameplate shall indicate the product name, model, manufacturer's name or trademark, factory number and manufacture.
Date, measuring range, measuring unit, accuracy grade, density of working liquid at℃ (inclination constant excludes working liquid).
The micro pressure gauge of bulk density may not be marked) and the maximum working pressure.
2 compactness
The micro-pressure gauge should be able to withstand the maximum working pressure 15 minutes, and there should be no pressure drop in the last 5 minutes.
3 accuracy level
See table 1 for the accuracy grade of the micro-manometer, and the allowable error is expressed as the reference error.
Table 1
Allow level 60 14 {WA(%)}! Accuracy grade1xvbuttxu} vqi0)1
clarinet
3. Verification conditions
4 verification equipment
4. 1 etalon
1 1 16
Calibration-compensated micro-pressure gauges, standard liquid pressure gauges or other pressure instruments with corresponding accuracy levels can be used.
The absolute value of the allowable error of the etalon should not be greater than 1/30 of the absolute value of the allowable error of the measured micro-manometer.
4.2 Other equipment
4.2. 1 liquid pressure gauge: The measuring range shall be 1 to 1.5 times of the maximum working pressure of the micro-pressure gauge, and the accuracy grade shall not be lower than.
Grade 2.5, with the division value not greater than IOPa.
4.2.2 Thermometer: the measuring range is 0-500C, and the dividing value is 0.5 C；;
4.2.3 Densitometer: the scale value is 0.5 mask/m; ;
4.2.4 Measuring cylinder: the upper limit of measurement is 500m 1 or1000m1;
4.2.5 Regulator capable of steadily pressurizing and depressurizing,
Timer.
5 The working fluid of the micropressometer is ethanol with a density of 8 10kg/m3 (95% by volume according to GB 679).
6 Verification of environmental conditions
6. 1 The micro pressure gauge shall be in a horizontal working position.
6.2 No vibration effect verification.
6.3 The verification temperature is 20-5T:, and the temperature fluctuation: during the whole verification process, the level 0.5 does not exceed 1`C, and the level 1 does not exceed.
2`C grade 1.5 shall not exceed 3 degrees Celsius. ..
6.4 Before verification, the pressure gauge should be placed at the verification temperature for more than 2h.
4. Inspection items and inspection methods.
7 appearance inspection
Visual observation shall comply with the requirements of Article I of this Regulation.
8 seal inspection
The leak check is carried out when the micro-pressure gauge is not filled with liquid.
Connect the air inlet nozzle, indicator nozzle,
The pressure regulator is connected with the liquid pressure gauge (as shown in Figure ①). then
Pressurize steadily until the maximum working pressure is maintained15min, and finally observe.
The indicated value of the liquid pressure gauge lasts for 5min, and the result shall comply with the provisions in the first paragraph 1 of this regulation.
The requirements of Article 2.
Even the translation of the Gun of the Rock is better.
9. 1
9. 1
9. 1
9. 1
Verification method and steps of basic error
Prepare the working fluid and determine the density value.
Schematic diagram of map seal sample inspection
1 single liquid pressure gauge; 2. The working liquid is pure water;
3 a voltage regulator; A- badge manometer; 5 a rubber tube; Buyi sitong joint
. 1
.2
.3
Clean the micro-pressure gauge, and then rinse it with the prepared working solution.
Inject the prepared working liquid, and then increase or decrease the pressure repeatedly to remove the air in the liquid until it is slightly pressurized.
The zero value of the instrument is stable.
9. 1.4 Connect both ends of the tee with rubber pipes to the positive (negative) pressure connectors of standard and micro-pressure gauges respectively, and connect both ends of the tee with rubber pipes at the same time.
The other end of the tee is connected with the voltage regulator through a rubber tube.
9. 1.5 Adjust the zero positions of standard instruments and micro-pressure meters under ventilation conditions.
9. 1.6 The indication verification of the micro-pressure gauge is carried out by direct comparison with the standard. Verification points should be evenly selected within the calibration range.
Take, 0.5 takes 5 points, and below 0.5 takes 3 points. The verification procedure shall be verified once according to the forward and backward travel. adjustable extent
Type, should be verified at the corresponding angle of each tilt constant (each angle needs to be readjusted to zero
1 1 17
Bit). Check the micro-pressure timing of 1.0 and 1.5, and the reading should be1/2 of the degree value; Verification of 0.5 micro-pressure timing and reading
The scale value of110 should be read. During verification, the pressure rise and fall should be slow and steady, and the zero position should be re-verified after verification. If the zero position changes too much,
When the absolute value of the allowable error exceeds 1/4, the zero position should be readjusted and verified again. For trace amounts with positive and negative pressure values
The manometer shall be carried out in the range of positive pressure and negative pressure respectively according to the above verification method.
9.2 Calculation of Basic Error
9.2. 1 The basic error of the micro-pressure gauge with the scale unit of Pa is calculated according to the formula [1]:
P color -Po
"Erling X 100'"
Where a is the basic error (%) of the piezometer;
P refers to the indicated value (Pa) of the micro-pressure meter under a certain inclination constant;
Po—— refers to the indicated value (Pa) of the calibrator;
Pt —— the actual density of the working liquid of the micro-pressure gauge (kg/m3);
P—— working fluid density indicated on the micro-pressure gauge (kg/m3);
P- #* 1 the upper limit value (Pa)o of the piezometer on the tilt constant.
9.2.2 The basic error of the manometer in millimeters is calculated according to the following formula:
A. When the tilt constant of the micro-pressure gauge does not include the density of the working liquid, its basic error av is calculated by formula (2).
a 1v
NI.sina.Pi.9-Po
l？ circumference ratio
x 100 % (2)
Where sina— is the inclination constant of the micro-pressure gauge (excluding the density of the working liquid), and a is the included angle between the glass measuring tube and the horizontal plane;
N 1 —— the scale indication of the micro-pressure meter under a certain inclination constant (2);
8— local gravity acceleration value (m/SZ);
L —— the upper limit liquid column height (mm) measured by the measured micro-pressure gauge on the inclination constant.
B. When the tilt constant of the micro-pressure gauge includes the density of the working liquid, its basic error is calculated by Formula (3).
. . Pi is one. .
One body.,,, Eight guards
Lp i
(3)
In the formula, the inclination constant (including the density of working liquid) of the K manometer is Psina (kg/m3) a.
9.2.3 The maximum basic error of each verification point shall comply with the provisions of Table 1.
5. Check and determine the result processing and check and determine the cycle period.
A verification certificate shall be issued to the micro-pressure meter that has passed the verification; Unqualified micro-pressure instruments shall be issued with a notice of verification results or downgraded.
After treatment and degradation, the micro-pressure gauge must be replaced with the accuracy grade mark, and the verification certificate of the corresponding grade shall be issued.
The verification period of the micro-pressure gauge shall be determined according to the specific use conditions, but the longest period shall not exceed 1 year.
appendix
Appendix 1 Verification Record of Tilt Micropressure Gauge
Precision grade number of inspection device manufacturer.
1 1 18
measuring range
Ambient temperature during verification
Standard number
Actual density of working liquid _
Nominal density of working fluid
Verification date
Accuracy grade of etalon
Appearance:
Seal:
Basic error verification:
1 13
K or slna
Standard indication
protactinium
Scale reading of positive-stroke miniature pressure gauge
One or two Pa
Reading of reverse stroke micro-pressure gauge
Rnln or Pa
one
one
one
} 1 1 1
one
one
one
} 1
The maximum error of barometer accounts for 22%
Checker count checker
(%)
verify the result
Appendix 2 Acceleration of Dish Force in Major Cities of China
Serial number area
g
(metric) 1 zone and zone 2 (new 12
three
four
five
six
seven
eight
nine
10
1 1
l2
l3
pipotia2ine palmitate
l5
l6
17
18
19
Beijing
Shanghai
Tianjin
Guangzhou
Nanjing
Xi'an
Taiyuan
Qingdao
Shenyang
Chongqing
Jinan
Zhengzhou
Chengdu
Dalian
Changchun
Kunming
Jilin province
Nanning
Wuhan first
20
2l
22
23
24
25
26
27
28
29
30
3 1
32
33
34
35
36
37
38
Hangzhou
Harbin
open
Lanzhou
Yan'an
Luoyang
Hefei
Zhangjiakou
Great harmony
Jinzhou
Chengde
Shijiazhuang
Baoding
Xuzhou
Tangshan
Lhasa
Head wrapper
Wuzhuhali
Pu n
9.7936
9 8066
9 7966
9.7926
9 7955
9 796 1
9 7947
9 8000
9.7984
9+8027
9.80 17
9.7997
9: 08 to 3: 00
9 7967
9.80 16
9 7799
9 7986
9 7994
9 795 1
1 1 19
sequential
1 ground sequence
[Place Name] (Xinjiang, China) Turpan City
g
(m/s 2)
9.8024
9.7936
9.7928
9.7933
9.7944
9.795 1
9.7936
9.7868
9.8080
9.80 18
9.7995
9.80 19
9.8032
9.789 1
9.796 1
Qingjiang Changhu Guankouyang
An JIU yi Wu Yu Han GUI
Zhou Dong Xin Zhou Chuan
Dan Fu Yin Fu
54 5 56 57 58 59 60 6 1 mason 64 65 67 68
Bengbu
Hailar
Nanchang
Changsha
Liuzhou
Huiyang
seaport
Hengyang
Xining
Qomul
Urumqi
Ulanhot
Chiamuze
Baoji
Mudanjiang
g
Cm Xi)
9.7954
9.808 1
9.7920
9.79 15
9.7885
9.7882
9.7863
9.7907
9.79 1 1
9.8006
9.80 15
9.8066
9.8079
9.7933
9.805 1
Qiqihar
Shanhai Pass
39 40 4 142 43 4 45 46 47 48 4950 5 1 52 53
Note: The gravity acceleration values of areas not listed in this table can be calculated by the following formula.
9.80 6 6 5x (1-0 .0 02 6 5 x o town)
Where the radius of R- other spheres is equal to 637 1 x 103.
Height of h- M A station;
Bamboo shoots-the latitude of the measurement site.
1 120
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