JJG 161-1994 First-class standard mercury thermometer JJG161-1994 standard download decompression password: www.bzxz.net
This regulation is applicable to the verification of first-class standard mercury thermometers with a temperature measuring range of -60~500℃, which are newly manufactured and in use.

-Verification Procedure for Standard Mercury Thermometer (Grade 1)
JJG161—1994
Verification Procedure for Standard Mercury Thermometer (Grade 1)
.I.JG 1G1—1994
Daiguanyi JJ1NI—1975
This inspection and testing regulation was approved by the State Technical Supervision Commission on April 5, 1999, and was implemented on December 1, 1994. Responsible unit: National Institute of Metrology Drafting unit: China Metrology Research Institute of Guangdong Province
The technical provisions of this regulation are drafted by:
Ten wind glue [China Institute of Metrology] Shen Zhengbao (Guangdong Institute of Metrology and Science) Co-drafting person:
Zhang Du (China Institute of Metrology) 920|| tt||Technical observation
Qualified conditions
IV. Verification items Verification method
h. Verification result screening
VI. Verification result treatment…
VI. Verification procedure for first-class standard mercury thermometers
This is applicable to the verification of first-class standard mercury thermometers with a measuring range of 501-500t and a measuring range of 300-500t respectively. 00t:4 mercury thermometer. Any of the three temperature factors can be calibrated separately. The product is used as the standard for the determination of first-class mercury flowmeters. Technical requirements
1 Glass
1.1 The glass used for the thermometer must meet the requirements of Y269-1984: 12 The thermometer surface must be smooth and clean, and there must be no defects that affect the reading and strength on the inner and temperature-sensitive bulb.
The meter should be flat and there should be no obvious presence of the phenomenon. 1.3
1.4 The temperature should be transparent, its cross-section should be perfectly round, the pores should be light, and there should be no heat content in the kidney, and it should be dry and neutral with sufficient strength. Gas. The connection between the sensor bubble, the middle bubble and the safety pool is in a smooth arc shape, and there shall be no gradual phenomenon: the upper limit of the humidity is higher than 30t: the safety bubble of the dial meter must be sealed. 2 Sensing liquid and column
2,1 Mercury and base alloy must be pure, coal-free, and gas-free. The liquid shall not be cut off, and the base alloy shall not solidify at 60 degrees.
2.2 The temperature sensing agent is virtualized, and there shall be no obvious damage or jump phenomenon when it is put on; the descending piece shall not leave marks on the transmission wall,
3 Graduation and marking
3.1 The scale line of the scale 1 (hereinafter referred to as the scale) shall be perpendicular to the center line of the rough impression, and the bottom shall be in the same plane and shall not be tilted.
1.2 The scale lines should be of uniform size. The distance between adjacent scale lines should not be less than (.5m). The width of the scale lines should not be greater than one-tenth of the non-uniform distance between two scale lines.
3.3 The numbers and measuring lines should be clear and the coloring should be solid and not out of scale. The scale value should be other than .05t. The scale marks should be at least ten (10) degrees Celsius (.1°C) per reading.
3.4 ​​The scale lines should have the following markings: "°C" on the international temperature scale, ... Or factory mark, manufacturing number, etc.
4 Partial dimensions of the thermometer
4.1 The distance between the zero-position line and the upper end of the temperature relief should not be less than t4unmm4. The distance between the lower limit and the middle upper end should not be less than 0:4.3 The distance between the upper limit temperature scale and the lower end of the safety bubble should not be less than Hmr.1422
44 For the accuracy meter with a temperature lower than the door, the distance between the limit scale and the temperature sensing bubble should not be less than 4.5 The total length of the accuracy meter: -30K% (54-10) m: 0--60 and - 500 shall not exceed (560-10) mm
4.6 The outer diameter of the temperature filter of the strong variable meter shall not be larger than the outer diameter of the glass: 5 Indication stability allowable error
After the indication stability test, the zero rise signal and the low drop value of the variable meter shall be within the period of 1. 5.1
5.2 When the temperature is at the lower limit, it shall not exceed
150,20k
The upper limit value of the control
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product 6.1 The degree of the scale of the new meter exceeds the provisions of Table 2. 6.2 In the same temperature range, the difference of the scale correction value of the calibration temperature point other than the seasonal position shall not exceed the provisions of Table 3. 6.3 The difference of the scale correction value of the calibration cycle of each calibration temperature point other than the seasonal position shall not exceed the provisions of Table 3. 2
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The safety of the vehicle shall not be exceeded. The guarantee for the left and right calibration points shall be within the range of 0.05
6.4 For the same thermometer, when the product of the calibration number of two (or more) times has been accumulated, if the internal calibration value (or the maximum and minimum values) of the two changes do not pass the requirements of Table 3, the arithmetic mean of H can be taken as the second (or the last) calibration value; and the corresponding common temperature of each test is the second (or the last) actual measurement and the internal calculation value.
6.5 For the thermometer with calibration data given in Section 6.4, in each calibration period, only the two temperature points of the thermometer with the upper and lower limits and the whole of the measurement shall be calibrated again. If the difference between the calibration correction value of the two group points and the calibration correction value of the corresponding points in the calibration period does not exceed the value specified in Table 3, the average value thereof can be taken as the calibration correction value of the lower and upper limits of the given period; the calibration values ​​of the intermediate points shall still use the values ​​of the previous calibration, and the intermediate points will be zeroed. For the calibration of the upper and lower limits of 2, the zero positions of the lower and upper points measured in this period can be used to calculate the error using the linear interpolation formula; for the calibrated thermometer with a limit temperature greater than 200°C, the error shall be calculated based on the zero position value given in the previous period and the zero position change difference of the two periods. The allowable difference of the capillary aperture and the uniformity of the engraving is that the midpoint indicating value between two adjacent specified calibration points shall comply with the provisions of Table 2, and the difference between the actual calibration value and the midpoint graduation correction value used for calculation within the adjacent specified calibration points shall not exceed (.05). III. Calibration conditions
B Standard: First-class standard platinum voltage-pass thermometer. 9. Calibration equipment
9.1 The leads of the thermometer bridge and the photoelectric amplifier galvanometer are switched. The bridge leads The relative difference of the positive film should not be greater than 2×1->, and the step value should be 1×-12: other electrical measuring instruments with technical indicators not lower than the above requirements:
9.2 The temperature tank, the temperature field uniformity always meets the requirements of Table 4. Other types of constant temperature devices with technical indicators that meet the requirements can also be used.
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Four verification items and verification methods
10 Appearance inspection
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New temperature meter ：The temperature of the meter in use shall meet the requirements of Article 1 of this regulation. If no temperature is found in the filter phase of the meter, it shall be adjusted after being checked: 924
11 Display stability test
11.1 Only for the newly manufactured, the upper limit temperature [0 temperature bucket is subject to this random inspection, and the test is as follows: I1.1.1. Treat the upper temperature for 30min, take out the cool part, and measure the temperature; treat the upper temperature for 24h, take out the cool part, and measure the zero position. 11.1.2
11.1.3. Treat the upper temperature with a 1mm piece, turn off the constant temperature heating power, and when the liquid level of the thermometer drops to the commercial temperature, insert it downward into the original mixed position, so that it slowly cools to the temperature of the temperature measuring medium, and take out the working position. 11.2.1. When the three-strand temperature treatment is carried out, the exposure value of the thermometer can be 201: 11.2.2. Before the upper limit of the test step 11.1.1 and the upper limit of the test step 11.1.2, the capillary tube and the upper limit of the test line are used to measure the zero position. If there is enough mercury evaporation in the bulb, the temperature rise method can be used for calibration. If the thermometer in the treatment of item 11.1.3 is full of water in the bulb or the upper part of the bulb is full of water, do not reverse the temperature rise method, and connect the method described in the following 1. 11.2.3 The upper limit treatment of items 11.1.1 and 11.1.2 is carried out in a vertical electric furnace. The temperature of the treatment should be the same as that of the temperature of the meter. The upper limit treatment of item 1.1.3: The upper limit treatment must be carried out in the temperature range of 0; the upper limit treatment of 30°C can be carried out in the vertical furnace, and the power of the electric furnace should be turned off. The temperature mark can be inserted downward without processing. The difference between the zero position measured in 11.1.1 and the zero position measured in 11.1.2 is the upper zero value. The difference between the zero position measured in 11.1.3 and the zero position measured in 11.1.4 is the lower zero value. The temperature of the new thermometer should be tested at the temperature of -0°C for the purpose of assessment. The test steps are as follows: 1.4.1 After 1 hour at (-600.2°C), read and record the indication of the thermometer; 2. Adjust the temperature of the low temperature damage to make it 0.2°C below the treatment temperature of 11.4.1, keep it constant for 11.4.2. Tap the thermometer for artificial stimulation and observe and read the indication of the thermometer. The results of the determination shall not show the phenomenon mentioned in 5.2. 12. Indication verification
12.1 Except for the case, the small value of other temperature points shall be determined by the comparison method: 12.2 Verification of temperature points: The thermometer in the range of 0~100℃ shall be verified for every 5 ... And estimate to one tenth of the graduation value. 12.5 The zero position of the thermometer must be measured in the water: before measurement, for thermometers with an upper limit temperature of 300°C, use a large microscope to check whether there is any heat generated by mercury in the middle and in the book. The method just described can be used. Put the pre-cooled thermometer vertically into the inner stomach of the three-point bottle so that the zero position mark does not show the ice surface but only a few points. After the indicated value is stable and the thermometer is tapped lightly, the reading is reversed with a reading type. 12.6 Zero position determination quantity: For thermometers with a range of 60-0°C, only one zero position determination is made before or after calibration, and this value is used for the calculation of the zero position at each fixed point; for thermometers with a range of 925°C and above, only measure the zero position at the first point after calibration, and calibrate the zero position at other points. The resistance thermometer should be measured by the method of calculation. The resistance thermometer should be measured at the water point K.12.7 The depth of the resistance thermometer should not be less than 250, and the monthly flow through the outlet chain should be 11m. The leakage surface of the meter should be straight and should pass through the filter. The exposure to the filter should be greater than 15 degrees. 2.8 When the temperature is set, the humidity meter must be preheated for 15min before entering the grid, and the temperature grid should be adjusted at the same time before the reading can be taken. When reading the initial reading, the temperature should be adjusted so that the thermometer is close to the calibration point accuracy scale line, and the maximum deviation should not exceed the allowable error of the thermometer. The humidity should rise slowly and evenly during the reading, and the reading should be fast and the time should be uniform. After reading each calibration point, the temperature change should not exceed 0.112, and the reading time should be 9. Take the resistance of the standard solution, and then use it to read the small digit of the temperature meter being tested, read the standard value 10 times, and read it back and forth 10 times in total. After the first reading, the new temperature meter being tested should be transferred to the first case for 5 readings. After the reading is completed, another calibration technician will check whether there is any reading error. Calculation of the calibration results
13 Calculation of the components
13.1 Calculate the average value of the indications of the 10 readings of the standard instrument and the average value of the indications of the 10 readings of the micro-test thermometer 113.2 The voltage ratio of the standard device to the calibration thermometer is W, =R,/F13.3 Within the range of 60-500, calculate the voltage limit of the standard thermometer measurement, and use the "table to calculate the actual intensity deviation determined by the standard instrument during adjustment" formula: 1-t.
Idt it
The nominal temperature t of the library calibration, the actual temperature near: the measured electric positive ratio: idw
The temperature meter given in the certificate, the starting high good ratio of the electric positive ratio change rate let the measured overflow meter collect water at three known points as the zero position ", press formula 13.4
, (positive method fee main reverse interruption number) x5 value -0.2
--standard pain water concentration thermometer graduation correction is to deduct the recorded number of information, the corresponding zero situation: 13.5
The correction value. Calculate the positive value using the above formula -A+
14 the second time 1 or the first time after measurement! Calculation steps for the initial value of the indication verification result: (3
14.1 Calculate the difference (maximum difference) between two (or more) verifications. If the table 3 is specified: take the arithmetic average as the second (or the next) graduation correction value: 14,2 The zero position of the first (or the last) measurement is the given value. The calculation example is shown in Table 5,
15. The calculation steps for the initial value of the indication verification result of only verifying the lower and upper limit points: 15,1 and the difference between the graduation positions of the lower and upper limit points of the two verifications in the same period. If it meets the requirements of Table 3: then the average value can be taken as the graduation value of the lower and upper limit points of this certain period; and the graduation value of each verification point is still Utilize the value of the calibration period. 92h
Risk theorem
The upper and lower limits of the calibration period are 3 to
This calibration is the difference between the sample values ​​of the same period (cumulative two periods) and the standard deviation of the two fixed periods. The calculation of the 4 digits of each calibration point in the calibration period is: (-1,30
13.2.1 For a thermometer with a humidity limit of 200%, the position of each point in the middle is: for this calibration period, the position of the upper and lower points is determined by the linear internal capture formula. 15.2.2 For a thermometer with an upper limit of 200℃, the zero position of the middle point is calculated by the following formula: -b+(a-b)+[(αr\r? .(αr(t--)
in: a.
this is measured according to the period, the upper limit zero position,! Lower, upper,, —1—period calibration certificate! Give the lower, upper limit and temperature, the rate position,; 1: upper—the thermometer's filtration lower, upper limit temperature quality,! [a soft zero surprise, the corresponding calibration temperature, for example, the calculation example 6 and the table listed,
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Use the linear interpolation method to calculate the correction value of the sampling midpoint temperature seat 1 using the following formula: 16
. 4.13
or:
the scale correction of the lower and higher sources of the two phases of the calibration point is calculated, and the difference between the scale correction values ​​of the main and actual calibration midpoints is calculated. VI. Processing of calibration results
[7 The total uncertainty of the calibration results of the thermometers calibrated according to this procedure at different leakage points is listed in Figure 8. Table 8
The total uncertainty of the calibration results is 0.05
and the value is reduced to D.1
The total uncertainty of the calibration results is (confidence rate)
18 The calibration certificate is issued to the qualified thermometers. The scale correction value and the corresponding zero position given on the certificate should be rounded to one tenth of the scale value. If the correction value of the scale exceeds the provisions of the second part, a notice of the verification result shall be issued. 19 The difference between the scale value of this cycle and the previous period shall meet the requirements of the third part. If it exceeds the provisions, a re-inspection shall be carried out to find out the reasons. Only after confirming that the verification of this cycle is correct can the verification certificate be issued. 20 The sampling results of the position and midpoint of the newly manufactured thermometer shall meet the requirements of Article 5 and Article 7 of the policy. If it exceeds the provisions, it cannot be used as a first-class standard water-based thermometer: 21 The verification cycle is 2 years.
Connection method of mercury evaporation drop
1 Rolling method
This method is suitable for: connecting the cold silver case with equal shape in the middle of the bubble, the connection method is as follows: 928
Used to gently vibrate the mercury liquid in the middle of the lower part of the belt, and separate the small and tiny groups. Move the temperature and meter a little, and gently move the water limit to the middle agent! The fruit evaporates at the bottom, and then, only the lower part of the temperature meter, the other hand gently weaves the palm of the other hand, so that the upper part of the middle bubble produces purple, and then the next time I have a virtual, so that the water drops out of the lower part of the water coupons, etc., the water is effective, and some people use a mirror to observe at any time, and the evaporation of the whole part is fully adjusted to be: after that, wet the temperature pool, so that the lower end of the middle has increased, at this time, the temperature can be kept at a very low temperature, and the second hand can be gently moved to make the water move down and reach the main body: for the temperature limit higher than 35, there is no reverse in the quality of the enterprise. After the cold movement, there is a curtain of water drops in the upper part of the bubble. Before measuring the cold, it must be connected. Therefore, you should be proficient in this method: separation The hot bubble method
is applicable to the evaporation of water droplets in the thin tube: first follow the above method 1 to remove small water drops, then hold the head of the thermometer and make it stand upright, gently move it on the surface, so that the water will bubble to the top of the capillary. At this time, you can use a lamp to bake the bubble to expand the gas inside. In this way, it will push and form a small mercury column in the thin tube and move it toward 1, which can be connected with the evaporation droplets of mercury in the capillary. Then place the thermometer in the room: make the mercury move down to the top of the middle tube. It is impossible to form a small mercury beam. You can use a cold bubble or an alcohol lamp to bake the bubble. This is called forming a non-water bubble. After a period of time, it can be connected with the mercury in the body. Appendix 2
Qualification certificate content
Indication of calibration results
Points of verification
Qualification certificate
Verification of civil servants
Recovery of civil servants
Real limit of actual position
Determination and application
Year
Year
Year
Yuexiao Date
Half 5th
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