Some standard content:
National Metrology Verification Regulation of the People's Republic of China JJG 130—1984
Liquid-in-Glass Thermomcters for Working1984—12—13Promulgated
Promulgated by the State Bureau of Metrology
Implementation on October 1, 1985
J.IG130—1984
Verification Regulation of Liquid-inGlass Thermometers forWorkingJJG130—1984
Replaces JJG 130—1972
This verification regulation was approved by the State Bureau of Metrology on December 13, 1984, and came into effect on October 1, 1985.
Responsible unit: Beijing Municipal Bureau of Standards and Metrology
Drafting unit: Beijing Institute of Metrology The drafting unit is responsible for interpreting the technical provisions of this regulation The main drafters of this regulation:
Wang Shuzhen
Wang Kaidao
Participating drafters:
Wang Fengcheng
J.IG130—1984
(Beijing Institute of Metrology)
(Beijing Institute of Metrology)
(China National Institute of Metrology)
Technical requirements
Verification equipment
Verification method
Processing of verification results
Appendix 1
Appendix 2
Verification record card for glass liquid thermometer
J.JG 130-1984
Verification Certificate Format of Glass Liquid Thermometerwww.bzxz.net
(4)
J.JG 130—1984
Verification Procedure for Working Glass Liquid Thermometers This procedure applies to the verification of working (industrial and experimental) glass liquid thermometers (hereinafter referred to as thermometers) with a measuring range of (-100+600) that are newly manufactured and in use. It is not applicable to the verification of special thermometers such as meteorological thermometers.
一Overview
Glass liquid thermometers measure temperature by using the thermal expansion of the temperature-sensitive liquid in the transparent glass temperature-sensitive bulb and capillary tube. Its structure is shown in the figure. 1—temperature-sensing bulb:
2-temperature-sensing liquid;
3——intermediate bulb:
one scale;
5——main scale:
6——capillary;
safety bulb
According to the different graduation values and measuring ranges, thermometers are divided into precision overflow meters and ordinary thermometers. As shown in Table 1.
Graduation value
Measuring range
1Glass
60- + 300
+ 300 + 500
- 100 +300
-30 - 600
2Technical requirements
1.1Glass should be smooth and transparent, without cracks and defects that affect strength (such as internal stress, etc.). There should be no defects that affect the reading within the indication range.
1.2 The thermometer should be straight, uniform in thickness, and without obvious bending. 1.3 The capillary should be straight, the aperture should be uniform, and the liquid column should have the maximum width when observing the thermometer from the front. The connection between the capillary and the temperature-sensing bulb, the intermediate bulb and the safety bulb should be rounded, without necking, and the tube wall should be clean and free of impurities. 1
J3G130-198-
1.4 A milky white or other color axial tape should be melted in front of the engraved back of the thermometer. When the liquid column is aligned with the left end of the short engraved line or observed from the left end, the adhesive tape should be located behind the liquid column. Hygrometers with an upper limit of more than 300°C are allowed to be without adhesive tape.
1.5 The casing of the internal standard evaporator should be clean and free of impurities, and there should be no glue that affects the reading. 2 Temperature sensing body and liquid
2.1 Mercury and mercury-based alloys must be absolutely clean, dry and free of bubbles. The liquid column of organic liquids should be clear and free of sediment. 2.2 The liquid flow shall not be interrupted or backflow (except for air flow). There shall be no obvious stoppage or jump when rising. There shall be no droplets or fish on the tube when falling. 3 Graduation and marking
31 The scale lines shall be perpendicular to the center line of the capillary. Graduation lines, numbers and other markings shall be clear and accurate, and the coloring shall be durable:
3.5 Every 1020 scale lines shall be marked with a corresponding number. The zero point and upper and lower limits of the thermometer shall also be marked with corresponding numbers.
3.6 The thermometer shall have the following markings: the symbol "℃" of the international standard "Celsius", the manufacturer's name or factory mark, the year of manufacture, the serial number, the immersion method and the immersion mark, etc. 4.1 Sensing Bubble: The diameter of the temperature-sensing bulb of the rod-type thermometer shall not be greater than the diameter of the glass rod: The diameter of the temperature-sensing bulb of the internal standard thermometer shall not be greater than the diameter of the lower body casing. 4.2 Intermediate Bubble: The distance between the upper end of the intermediate bulb of the thermometer and the first scale line at the lower end of the main scale shall not be less than 30mm4.3 Safety Bubble: The top of the safety bubble of the thermometer should be hemispherical. The safety bubble should be able to accommodate the liquid volume when the temperature-sensing bulb exceeds the upper limit temperature of 60C. The overflow meter with an upper temperature of more than 300C may not be equipped with a safety bubble. For overflow meters without safety bubbles, the length of the capillary above the upper limit temperature scale shall not be less than 20mm5 Indicator Stability
The rise value of the zero position of the overflow meter after the stability test shall not exceed 1/2 of the scale value (the thermometer without zero auxiliary mark can measure the upper limit temperature indication value). For thermometers with a graduation value of 0,1C above 200°C, the zero point rise value shall not exceed the graduation value.
6 Permissible error of indication
Permissible error of indication of thermometer: Thermometers shall comply with the provisions of Table 2: Authorized thermometers shall comply with the provisions of Table 3. When the range of the thermometer jumps over several temperature ranges in Table 2 and Table 3, the maximum indication tolerance shall be used to calculate the temperature range where the upper or lower limit of the thermometer is located. 2
sensing body
organic liquid
temperature sensing liquid
organic liquid
temperature range where the upper or lower limit of the thermometer is located
- 30 -- 1 100
60 -30
30-- +100
>100--200
>200--300
>300 400
>400--500
>500-600
temperature range where the upper or lower limit of the thermometer is located
30 - +100
30 ～ + 100
>100～200
>200 ~ 300
>300---400
>400 -- 500
>500 -- 600
J.IG 130—1984
Permissible error of indication of diffused thermometer
Permissible error of indication of immersion thermometer
JJG130—1984
Three verification equipment
7 According to actual needs, the following standards and verification equipment can be selected respectively. 7.1 Second-class standard mercury thermometer (-30℃-+500). 7.2 Second-class standard mercury base meter (-60℃0℃). 7.3 Second-class standard platinum resistance thermometer (200～630℃) and supporting electrical measuring equipment. 7.4 Standard copper-constantan thermocouple (200℃-0℃) and supporting electrical measuring equipment: 7.5 Constant temperature bath (technical requirements see Table 4) and ice point bath. 7.6 Reading telescope, glass polarization stress meter, steel ruler and reading magnifying glass (5~10 times), etc. Table 4
Precision thermometer
Name of constant temperature bath
Alcohol low temperature bath
Alcohol low temperature bath
Water constant temperature bath
Oil temperature bath
Salt or tin bath
Measuring range
-100 —30
30 -0
75 ～ 300
300 ~ 600
T.Working area
Maximum temperature difference
Working area
Horizontal temperature difference
For ordinary thermometers
『Working area
Maximum humidity difference
Note; (1) The depth of various constant temperature folds must ensure that the standard thermometer can be fully immersed and should be covered: t
Working area
Horizontal temperature difference
(2) The working area in the constant temperature bath refers to the maximum range that the temperature sensing bulb of the standard thermometer and the thermometer being tested can reach. The maximum temperature difference refers to any two points at different depths. IV. Verification method
8 Appearance inspection
8.1 Newly produced thermometers: The use of glass polarizing stress gauges and steel rulers to visually inspect thermometers shall comply with the provisions of Articles 1 to 4 of this regulation.
JJG 130--1984
8.2. Temperature setting in use: Before calibration, check whether the glass rod of the thermometer has cracks; whether there are breaks and bubbles in the liquid interface: if there are, it can be calibrated after repair. 9. Verification of indication stability
Newly produced thermometers with an upper limit temperature of more than 100℃ are subject to this random inspection. The calibration steps are as follows: 9.1 Treat the thermometer at the upper limit temperature for 15min, take it out and cool it to room temperature, and measure the first zero point position. 9.2 Treat the thermometer at the upper limit temperature for 241 (precision thermometer) or 48h (ordinary thermometer), take it out and cool it to room temperature naturally, and measure the second zero point position. The zero point rise value is subtracted from the second zero point position, and the value should comply with the provisions of Article 5.
9.3 Thermometers without zero point can directly determine their upper limit temperature bearing value according to the above method. The difference between the two calibration results (rise 9.4 When measuring the zero point and indication, please check whether the mercury evaporates and the gas pool 10 Indication verification
10.1 Verification point regulations: The interval between the thermometer verification points is shown in Table 5. Table 5
When the thermometer has less than 3 verification points as specified in Table 5, the calibration should be carried out at any point at the beginning, end and middle of the scale. The thermometer in use can also be verified according to the user's requirements. The thermometer produced shall be inspected at random points between two specified inspection points, and the tolerance of its indication shall comply with the provisions of Table 2 and Table 3.
10.2 Inspection order: Take zero point as the boundary and proceed point by point in the upper or lower limit direction. 10.3 Immersion.
10.3.1 The liquid column exposed by the fully immersed thermometer shall not exceed 15mm. When the fully immersed thermometer is partially immersed in special circumstances, its indication shall be corrected according to the following formula:
AT -KN(TT)
Where: △T——temperature correction value of the exposed liquid column; (1)
K——apparent expansion coefficient of the temperature-sensitive liquid (mercury: 0.00016, alcohol 0.00103, kerosene 0.000 93);
FJG 130—1984
8 Degrees of the exposed liquid column (converted to an integer): T—average temperature of the exposed liquid column measured by the auxiliary thermometer (the auxiliary hygrometer is placed at the lower 1/4 position of the exposed liquid column, and it is important to make good contact with the thermometer under test): T—the temperature indicated by the thermometer.
Actual indication—indication of the thermometer under test + correction for the temperature of the exposed sample
10.4 Zero point calibration.
10.4.1 Obtaining the zero point: Break the steamed water ice or ice from the ice (be careful not to overcool the ice) into crab-shaped pieces and put them into the freezing point tank. After adding the steamed water from the ice tank, stir with a clean glass rod and gradually make the ice foam. Calibrate with second-class standard mercury, and wait until it is stable. 10.4.2 When verifying the zero point, the hygrometer should be vertically inserted into the freezing point tank, and the wall should not be less than 20mm from the wall of the device. Reading can be done only after the value is stable.
10.5 The comparison method is used for verification of other temperature points. 10.5.1 The hygrometer is vertically inserted into the tank in a standard way. Before insertion, it should be preheated (above zero thermometer) or precooled (below zero thermometer). When reading, the temperature of the temperature tank should be controlled within 0.20° from the verification point (based on the standard thermometer).
10.5.5 The zero position of the second-class standard mercury thermometer shall be measured after each use (measured twice for each use if used continuously). When the measured zero position changes, the new indication correction value of each point shall be calculated by the following formula:
New correction value = certificate correction value + (zero position of the upper limit temperature test start of the certificate · newly measured zero position of the upper limit temperature test start).
11 Calculation of actual temperature and correction value
J.IG 130—1984
11.1 The actual temperature determined by the second-class standard mercury thermometer shall be calculated by the following formula: Actual temperature = indication of standard mercury thermometer + correction value of the point 11.2 The actual temperature determined by the second-class standard platinum resistance thermometer and the standard copper-constantan thermocouple shall be calculated in accordance with the relevant provisions of LJG160—1975 and JJG115--1981 verification regulations. 11.3 The correction value of the tested thermometer = the actual temperature of the tested thermometer. V. Handling of the verification results
12 Precision thermometers that meet the requirements of this regulation after verification shall be issued with a verification certificate, ordinary thermometers shall be issued with a certificate of conformity, and unqualified thermometers shall be issued with a verification result notice: 13 Verification cycle: It should be determined according to the specific use situation, and the longest shall not exceed 1 year. Appendix 1
Standard thermometer number
Zero point position (Z2)
Division detection
Average reading value
Standard thermometer
Indication correction value
Actual temperature
Tested thermometer
Indication correction value
JJG130-1984
Glass liquid thermometer verification record card
Standard thermometer
Tested thermometer
, verification2 When checking the zero point, the thermometer should be inserted vertically into the freezing point tank, and the distance from the wall should not be less than 20mm. The reading can be made only after the value stabilizes.
10.5 The other temperature points are checked by comparison method. 10.5.1 The hygrometer is inserted vertically into the tank in the specified way. Before insertion, it should be preheated (thermometer above zero) or precooled (thermometer below zero). When reading, the temperature of the temperature tank should be controlled within 0.20° from the calibration point (based on the standard thermometer).
10.5.5 The zero point position of the second-class standard mercury thermometer should be measured after each use (measured twice for each continuous use). When the measured zero point position changes, the following formula should be used to calculate the new indication correction value of each point:
New correction value = certificate correction value + (zero point position of the upper limit temperature calibration of the certificate·zero point position of the upper limit temperature calibration of the new measurement).
11 Calculation of actual temperature and correction value
J.IG 130—1984
11.1 The actual temperature determined by a first-class standard mercury thermometer is calculated by the following formula: Actual temperature = indication of standard mercury thermometer + correction value of the point 11.2 The actual temperature determined by a second-class standard platinum resistance thermometer and a standard copper-constantan thermocouple is calculated in accordance with the relevant provisions of the verification procedures of LJG160—1975 and JJG115--1981. 11.3 The correction value of the tested thermometer = the actual temperature of the tested thermometer. V. Handling of verification results
12 Precision thermometers that meet the requirements of this regulation after verification shall be issued with a verification certificate, ordinary thermometers shall be issued with a certificate of conformity, and unqualified thermometers shall be issued with a verification result notice: 13 Verification cycle: It shall be determined according to the specific usage conditions and shall not exceed 1 year at most. Appendix 1
Standard thermometer number
Zero point position (Z2)
Division detection
Average reading value
Standard thermometer
Indication correction value
Actual temperature
Tested thermometer
Indication correction value
JJG130-1984
Verification record card for glass liquid thermometer
Standard thermometer
Tested temperature
, Verification2 When checking the zero point, the thermometer should be inserted vertically into the freezing point tank, and the distance from the wall should not be less than 20mm. The reading can be made only after the value stabilizes.
10.5 The other temperature points are checked by comparison method. 10.5.1 The hygrometer is inserted vertically into the tank in the specified way. Before insertion, it should be preheated (thermometer above zero) or precooled (thermometer below zero). When reading, the temperature of the temperature tank should be controlled within 0.20° from the calibration point (based on the standard thermometer).
10.5.5 The zero point position of the second-class standard mercury thermometer should be measured after each use (measured twice for each continuous use). When the measured zero point position changes, the following formula should be used to calculate the new indication correction value of each point:
New correction value = certificate correction value + (zero point position of the upper limit temperature calibration of the certificate·zero point position of the upper limit temperature calibration of the new measurement).
11 Calculation of actual temperature and correction value
J.IG 130—1984
11.1 The actual temperature determined by a first-class standard mercury thermometer is calculated by the following formula: Actual temperature = indication of standard mercury thermometer + correction value of the point 11.2 The actual temperature determined by a second-class standard platinum resistance thermometer and a standard copper-constantan thermocouple is calculated in accordance with the relevant provisions of the verification procedures of LJG160—1975 and JJG115--1981. 11.3 The correction value of the tested thermometer = the actual temperature of the tested thermometer. V. Handling of verification results
12 Precision thermometers that meet the requirements of this regulation after verification shall be issued with a verification certificate, ordinary thermometers shall be issued with a certificate of conformity, and unqualified thermometers shall be issued with a verification result notice: 13 Verification cycle: It shall be determined according to the specific usage conditions and shall not exceed 1 year at most. Appendix 1
Standard thermometer number
Zero point position (Z2)
Division detection
Average reading value
Standard thermometer
Indication correction value
Actual temperature
Tested thermometer
Indication correction value
JJG130-1984
Verification record card for glass liquid thermometer
Standard thermometer
Tested temperature
, Verification
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