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Verification Regulation of Bimetallic Thermometers
JJG226—2011
Verification Regulation of Bimetallic Thermometers
JJG226201
Generation: 226—1989
This regulation has been approved by the State Quality Supervision and Inspection Administration on June 2000 and will be implemented from 201【03】onwards
Responsible unit: Enterprise Technical Committee Drafting unit: Tianjin Institute of Metrology and Technology This regulation is mainly drafted by:
Tu Meihua (Tianjin Institute of Metrology and Technology)
Nan Fei (Otsu Institute of Metrology and Technology)||tt| |Available documentswww.bzxz.net
Metrological properties requirements
General technical requirements
Instrument card preparation
Record format for national temperature base meter confirmation
Appendix [
Data processing example…
Error analysis
.9.5.5
1 Range
Verification procedure for bimetallic thermometers
This regulation is applicable to the initial verification of the effective metal temperature (excluding thermometers) with a measuring range of -80-500, and the subsequent control and inspection of the effective metal components and the protective goods printed into a special function salt. 2 Citations
The documents cited in this standard are:
F10—1999 Uncertainty in Dating
88031998 Double-layer Temperature Measurement
When other regulations are used, the current valid versions of the documents cited above should be noted. 3 Terminology
3.1 Adjustable angle thermometer
A thermometer that can adjust the angle between the indicating device and the detection device (~90°). 3.2 Electric contact thermometer
A thermometer with a temperature sensor that can be used as a switch type electrical contact device. 4 Overview
An effective thermometer uses two metal (or composite) sheets with different expansion coefficients that are fixed together and form a temperature sensing element. The two sheets are wound in a spiral shape, as shown in the figure. One of them is fixed and the other two (mounts) are equipped with indicators. When the temperature changes, the temperature sensor changes its rate and rotates from the top to compensate for the current temperature value indicated by the indicator on the suction cup. 5 Metrological performance requirements
Accuracy grade and maximum allowable error
Accuracy grade and maximum allowable error of the thermometer The allowable error (allowable error limit) shall comply with the provisions of Table 1. 5.1 The error of angle adjustment of adjustable thermometer due to angle adjustment shall not exceed 1.0% of its data. The error of the same setting temperature in Table 1 shall not exceed the absolute value of the maximum error. 5.4 The maximum allowable depth (unique reading) of the thermometer shall not exceed 1/2 of the absolute value of the error. 5.5 The error of the fixed point of the thermometer shall not exceed 15 times the allowable error. 5.6 The switching error of the thermometer shall not exceed 1.5 times the allowable error. . 5.7 Cut-off temperature
For the thermometer, its switch to the replica should not exceed the maximum allowable error and absolute value. SR thermal frequency quality
Low element 1
First of all, the meter is in the range of 2 hours. After the meter remains in the range of 2 hours, its indication value meets the requirements of 2.1 of this regulation.
Health rate · 5
General technical requirements
6.1 Appearance
Approval:
Deep parts can be confirmed by the receiver
All parts of the meter should be firmly assembled without looseness: no rust, solid and smooth: the glass or other transparent materials used in the meter head should be transparent, without defects or stealing of the scale lines on the meter dial, and the number should be correct. The other markings should be complete, clear and correct, the thermometer pointer should cover (extend) the shortest visible 1/43 of the money, the pointer should be clear and the width of the scale line should be small.
6.1.5 The distance between the pointer and the flat line of each meter should not be greater than 5 meters: but it should also be small. The temperature should be checked from the unidirectional (or radial) position (or the entire position of the axis) at the same time. 6, 1.6 The temperature meter has a plate 1 product mark! More or factory marks), the factory number, the national temperature standard "" and the quality grade, the manufacturing year must be measured by the meter book license number and the required number: the seven old point meter selection shop has the rated rolling point and the contact point (AC or current: the working voltage is high, the most people are also connected, and the connection is reliable! "6.2 Insulation resistance Under the condition of ambient temperature of 15.-35%:, relative density 85%, the insulation resistance between the contacts (or external) and the output terminals should be less than 3 short-circuit resistance. Leliang Eight
7 Measuring instrument control
Continued stroke
De Le Shangxin
Measuring instrument control includes: initial verification, piece twisting verification and extension inspection. 7.1 According to the specified parts
7.1.1 Average use 7.1.1.1 Standard Instruments The calibration group of the light standard instrument of the instrument is respectively used for the first-class standard water-cooled thermometer, the standard mercury-based thermometer, the standard copper-copper thermocouple and the second-class standard electric positive welding reverse juice 7.1.1.1 The supporting equipment is the constant temperature bath and the technical certification is shown in Table 4. Current +
non. source. international
situation certificate deep hold 1)
commercial deep according to
use the western sequence into the room full -
5.3 ~ 3131
Note: (!1(2).13)Select other conditions that are not uniform. 1. Standard saw-copper heat seven pairs are selected. Use second-class resistors as standard devices, and select U.02-level low-level DC potentiometers and supporting equipment, or other electrical measuring equipment with the same accuracy. c, ice point standard
) Reading amplification flow (5-10 times)
Reading effect The initial working environment of the telescope or the megohmmeter is as follows: temperature: 15-35, relative humidity: 85%. 7.1.2.1 7.1, 2, 2 The working environment of the 5 standards and the measuring equipment used shall meet the conditions specified by the state. 7.2 Verification items H The verification items of temperature are shown in Table 5.
Switch the meter
Classification
Absolute electricity
Note: The large
7.3 Inspection method
indicates that the standard must be produced
. 3.1 The outside welcomes
"After the large inspection
, the specification does not show
. Please use the small specification
. You
Use the small observation thermometer every day. This specification is 6, 1, the subsequent verification of the identification of the meter during use is allowed to have defects that may affect the use and correct readings,
7.3.2 Insulation socket
Use a specified value of the megavoltmeter to measure the insulation voltage between the output terminal and the input terminal: It should comply with the provisions of 6.2 of this regulation, 7.3.3 The indication difference
The method of thermometer should comply with the requirements of the product manual or be fully verified. 7.3.3.2 For the first verification of the thermometer, the verification points are evenly distributed over the entire specification (must include the upper and lower limits), and shall not be less than points. 3.3.3.3 After the thermometer is inspected in use, the calibration points shall be evenly distributed in a single measuring range (including the upper and lower limits of measurement), and shall not be less than "1". The thermometer shall include the calibration points. 3.3.4 The calibration of the thermometer shall be carried out in both working and reverse directions, and the measurement shall be made in the upper and lower limits. When measuring the lower limit value, only the single-stroke calibration is performed. When reading the indication of the thermometer to be inspected, the line of sight shall be vertical to the dial. When reading with a magnifying glass, the line of sight shall pass through 7.3.3.5
Effective mirror center. When reading, the reading should be estimated to 110 of the scale value. 7.3,3.6 The indication value of the adjustable meter should be checked at the specified point of 7.3..70t.
Check the detection element of the meter: the freezing point of the medium with ice, water and coal, and read after the indication value stabilizes: 7.3.3.% Other service point inspections
Put the detected temperature-sensitive detection element and the standard meter in a constant temperature, and wait for the minimum value to stabilize before reading this number. When this number is in the specified value, the temperature of the standard inspection point shall not exceed 7.3.The following values are recorded: (based on the standard system), the value of the temperature gauge and the chain temperature gauge, and the value of the standard system. During the reading process, the temperature of the structure shall not exceed 0. When the temperature exceeds 30U, the temperature change shall not exceed 3℃. When the convex point overflow meter is used for small parts, the upper and lower limit setting needles are set to the positions outside the upper and lower limits respectively. However, the error flow of the temperature gauge is in accordance with the current file 5.1. 7,3.4 Angle adjustment error section
The error is normal. The calibration stops at the actual temperature. The adjustable angle meter is adjusted from the axis (or diameter) position to the same axis: The maximum change in the temperature change that must be generated during the process of the temperature gauge is the angle adjustment method, which complies with the provisions of 5.2 of this specification.
The verification of the thermometer's return difference and indication verification are carried out at the same time (except for the upper and lower limits of the verification points). The values of the positive and reverse indications at the same verification point are called the error, which meets the requirements of 5.3 of this regulation. 3.6 Resilience
In the verification of the thermometer's forward or reverse indication, the six values are repeated at each verification point (a minimum of several times) to calculate the maximum difference between the same indications at each point, which is called the complexity of the thermometer, which meets the requirements of 5.4 of this regulation:
7.3. Setting point error
7.3.7.1 The verification of the set point error of the contact thermometer for the first verification shall be carried out within 10% to 50% of the range. At each verification point, the stop and stop behavior is a cycle, and the verification shall be carried out for at least one cycle. 7.3.7.2 Connect the measured point thermometer to the signal circuit, and then slowly change the temperature (the source should be changed to less than 1:/min), so that the contact produces a closing and a new switching action (the signal circuit is connected and disconnected). During the action, the minimum value of the standard temperature is read, which is the upper switching value of the positive and reverse switching of the point. The average value of the upper switching value and the average value of the lower switching value is calculated as the switching median value for three times. 7.3.7.3
7.3.7.4 The set point error is the difference between the main switching median value and the set point temperature value. The set point error should comply with the provisions of 5.5 of this regulation.
7.1.7.5, The set point error of the contact thermometer for subsequent verification and use inspection is allowed to be carried out at only one interval. The fixed point can be determined according to user requirements. 7.3.7.6 Subsequent verification and in-use inspection. When the contact temperature is verified for set point error, only one cycle of trial adjustment is allowed, and the average value of the upper switching value and the lower switching value is used as the immediate switching median value. The set point error is determined by the difference between the switching value and the set point value. When the verification result needs to be adjusted, one more cycle can be added. Calculate the half mean of the upper switching value and the half mean of the lower switching value as the switching median value, and calculate the set point error. It should comply with the provisions of 5.5 of this regulation. 7.4.8 Switching error section
7.3.8.1: When the flowmeter is first calibrated, the calibration and error-free calibration shall be carried out at the same time, at the same set point, the average value of the upper cut-off value and the average value of the lower cut-off value shall be the switching error of the point, and the switching error shall be in accordance with the provisions of Section 5.6 of this Regulation.
7.3.8.2 For the electric rolling point thermometer that is continuously calibrated and tested in use, at its set point, the difference between the upper cut-off value and the lower cut-off value shall be the switching error, and the switching error shall be in accordance with Section 5.6 of this Regulation: 7.3.9 Switching error standard
For the first calibration of the group thermometer, calculate the maximum difference between the upper cut-off value and the lower cut-off value obtained at the same set point 1, and take the larger value as the switching repeatability. It shall comply with the provisions of 5.7 of the regulations. 7.3. Thermal stability
For the thermometer that has been calibrated for the second time, put it in the constant temperature unit and get the temperature within the limit (with little fluctuation! 2 minutes to go through the set time as shown in Table 2, take out the cold lamp and put it in the table, and do the "second minimum value determination" by hand. The indication error of each point of the meter shall comply with the provisions of 5.K of the regulations. 7.3.11.1 When selecting the first-class standard mercury thermometer and the standard thermometer as the standard: the constant temperature pin actual point standard one ... Temperature (1) calculation formula
+=t+Aer(dedt),
wherein:
effective fixed point nominal temperature, t::
the corresponding temperature measured during the actual measurement (the thermal potential (, V) and the thermal effective potential (V) given in the certificate at the nominal temperature: V fixed point thermoelectric potential change rate, uV,
(derde
at 0 note the following:
(de/d),-a,-2as!+3a:
the coefficient of the thermoelectric system given in the certificate: above:
fde/d),-o:20t130t
:,, 3 the coefficient of the thermoelectric relationship given in the certificate 7.4 verification Results processing
A certificate of verification is issued to qualified thermometers: A certificate of verification is issued to qualified thermometers.
7.5 Verification period
The verification period of the thermometer should be determined according to the specific use situation. It should not exceed 10.95.3
About the verification instrument:
Address
Production certificate ：
Investment project:
Version package
Shangjingzhou construction step
Conversion average price:
Planning + position:
Designated supply seat
Pregnancy certificate:
H factory grade number,
Investment resistance:
Bimetallic thermometer calibration record format
—production
Comfort degree:||t t||Moving point double and belonging to people
Set point method type
Pad heat 61
Appendix B
Data processing example
t.5 change to.t
Type:
No.:
Date:
Select standard situation - system thermal power low as standard, for · support test range is a 40" + 8%:, continental temperature Grade 1.5: Graduation value is 2.0; Double Jin Er Yu Ting: Carry out calibration at a 40% point, calculate the indication error of the cut-off thermometer at this point
R.1 Calculated value temperature inside the calibration point (2 "(℃, standard difficult to shoot the pot through the heat electric adjustment near the calibration point to the actual value of the internal heat electric labor 2 = 495VH standard destruction heat medium couple certificate variable waiting
eu = - 14MrV,r, 0+ +x21*+t3t2-38.9964.a-4.872215×tu,2.9r94 7102e - r:1445 (12H0) -- 15pV
tdede. - d: + 2at - 3a.t-: 35uvt:954
The actual temperature of the constant salt grid
1+Aecle),-40 +15)/35-*40.4t
B. The indication error of the 2-wave temperature detector at -4Ut: is short: At the fixed point nominal table of 1000000, the indication of the thermometer to be detected is 40. The error of the salt meter to be detected is the actual temperature of the constant overflow range of the minimum value of the temperature to be detected = 10.8 - (-40.4)
1. The test temperature is reduced to 40-+, its volume is 520t, the level is 1.5, and the maximum allowable error is 11.3:. After calculation, the error is -40.4, which does not exceed the maximum allowable error
Error analysis example
C1 Overview
According to the calibration method of this paper, the two The standard water-sensitive thermometer and the tested bimetallic thermometer are placed together in a constant current and calibrated by comparison method: under different constant temperature conditions, a bimetallic thermometer with a measurement range of 0.-300°C, an accuracy grade of 1.5 and a graduation value of 5.0 is calibrated at 300°C and the minimum value of the thermometer at 300°C is obtained by calculation, and its uncertainty and expansion are analyzed. C.2 Mathematical formula
J=t -(TA)
Formula 4: --The error of the bimetallic thermometer at 300°C; 1 --The error of the bimetallic thermometer at 300°C; 1 --The error of the bimetallic thermometer at 300°C; 2 --The error of the bimetallic thermometer at 300°C; 3 --The error of the bimetallic thermometer at 300°C; 4 --The error of the bimetallic thermometer at 300°C; 5 --The error of the bimetallic thermometer at 300°C; 6 --The error of the bimetallic thermometer at 300°C; 7 --The error of the bimetallic thermometer at 300°C; 8 --The error of the bimetallic thermometer at 300°C; 9 --The error of the bimetallic thermometer at 300°C; 10 --The error of the bimetallic thermometer at 300°C; 11 --The error of the bimetallic thermometer at 300°C; 12 --The error of the bimetallic thermometer at 300°C; 13 --The error of the bimetallic thermometer at 300°C; 14 --The error of the bimetallic thermometer at 300°C; 15 --The error of the bimetallic thermometer at 300°C; 16 --The error of the bimetallic thermometer at 300°C; 17 --The error of the bimetallic thermometer at 300°C; 18 --The error of the bimetallic thermometer at 300°C; 19 --The error of the bimetallic thermometer at 300°C; 20 --The error of the bimetallic thermometer at 300°C; 214 Evaluation of standard uncertainty
C.4.1 The standard uncertainty is the main source of standard uncertainty. The standard uncertainty caused by the indication estimation of the double gold thermometer is (4), which is evaluated by Class A standard uncertainty. Because the indication of the double gold thermometer is estimated to be 1/0, that is, 0.5Y, the error caused is 0.5/2-0.25, including the factor V3, the standard uncertainty is () = 25-0.15
The reliability of the first value is 10%, then the degree of freedom is (10%! = 50L) The special uncertainty caused by the indication of the double gold thermometer is (), Class A standard uncertainty evaluation| |tt||A bimetallic thermometer with a measuring range of 1-3Kt, an accuracy level of 1.5 and a graduation value of 5.0 is used for 10 times at 25, 150℃ and 275℃ respectively until the test is completed (the test is carried out on the positive stroke). In this way, 0 groups (a total of 1) of indications are obtained. Then the experimental standard error is calculated respectively: that is: 5=0.121>:-1.061=0.08$40.070.10 -u.0Gt: s- -0.6c --0.06*o-0.(16t? () =ir=.12. Hfl degrees() --x (1-) 8[Because, () and (are not mutually exclusive, so
ut+) -- V *+t:+ + n*(+) - D.j9t by
C,4.2±! The uncertainty of the standard change "(to evaluate) the indication of the mercury temperature of the second standard standard mercury thermometer should be estimated to 1/0 of the test scale, that is, 0.01℃, the error caused is .005. Because the logarithmic value is small, the uncertainty of the standard caused by the temperature fluctuation can be ignored (), the standard is not used to evaluate the temperature fluctuation. The maximum change in the reading process does not exceed 1.7, the standard distribution method is used to distribute the temperature, including the standard? =, the standard is not The accuracy is () = (0.12)2 = 0.0, and the reliability of the calculated value is 20%, so the standard uncertainty is () = (2%)-32 = [2) The standard uncertainty of the inhomogeneity of the constant temperature field is 4 (below,), and the L-type standard uncertainty is used. The new field report is not more than .2, and the total distribution is uniform, including 3, and its standard uncertainty is (T,) = (0.2/2)3 = 0.06, and the reliability of its estimated value is about 20%, so the accuracy + () = (20%)2 = 12. The () and () are not related, so: T) -V±2 (T) -2(T)=U.01t:
C.4.3 Discussion on the evaluation of standard uncertainty of quantity A (A) The main sources of standard uncertainty of quantity A are: a; the standard uncertainty (A,) introduced by the correction value of the second-class standard mercury thermometer is evaluated through the Class B standard uncertainty: from the second-class standard mercury thermometer calibration procedure, the extended uncertainty of the indication calibration drill bit at t can be 0.0G: the confidence rate is 99% including four parts = 2.5%, its standard accuracy (A,).0.06/2.580.027
b the standard uncertainty introduced by the second-class standard mercury thermometer not being corrected to zero within the period is Class B standard uncertainty. The error introduced by the second-class standard mercury thermometer not being corrected to zero within the period is .G, the length difference is evenly distributed at points, including points, its standard uncertainty? A, U.% = T, its estimated flash accuracy is about 20, agent 1 layer" (4,) = (20%) - / 2-12956
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