Some standard content:
National Metrology Verification Regulations of the People's Republic of China JJG 976—2002
Opacimeters
2002-T1-04 Issued
2003-02-04 Implementation
Issued by the General Administration of Quality Supervision, Inspection and Quarantine JG6—202
Verification Regulations of Transmission Smoke Meters
Verification Rcgulition ofWww.bzxZ.net
Opacimetcrs
JJG976—2002
This regulation was approved by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China on November 4, 2002, and will be implemented on February 4, 2003.
Responsible unit: National Optical Measurement Technical Committee Drafting unit: Shanghai Measurement and Testing Technology Research Institute Nanhai Nanhua Instrument Co., Ltd.
Jiangsu Quality and Technical Supervision and Inspection Research Institute Addition unit: Yuanmen Haiteng Engine Test Equipment Co., Ltd. Approval of this regulation National Optical Measurement Technical Committee Explanation of this regulation Main drafters of this regulation:
JJG 9762002
Bao Guohua (Shanghai Institute of Metrology and Testing Technology) Yang Yaoguang (Nanhai Nanhua Instrument Co., Ltd.) Shi Jianhua (Jiangsu Provincial Quality and Technical Supervision Inspection Institute) Drafting Person:
Zhang Chun (Doumen Haiteng Engine Testing Equipment Co., Ltd.) Tu Haiwen (Shanghai Institute of Metrology and Testing Technology) Yan Jin (Zhejiang Provincial Quality and Technical Supervision Inspection Institute) Lin Yongming (Yuanmen Haiteng Engine Testing Equipment Co., Ltd.) Scope
References
3 Terms and measurement units
3.1 Light transmittance r
Mega absorption ratio
Effective length of optical channel L
Light absorption coefficient
Effective length of optical channel,
Metrological performance requirements
Light absorption ratio N|| tt||Light absorption coefficient
Response time of the measuring circuit of the fuel meter
Smoke temperature displayed by the smoke meter
Oil temperature measurement of the smoke meter
5.6 Speed measurement of the smoke meter
6 General technical requirements
JJG976—2003
Smoke meters in motor vehicle inspection stations equipped with computer control systems 7 Measuring instruments and their manufacture
7.1 Verification conditions
Controlled items
Verification methods
7.4 Processing of verification results
7.5 Verification cycle
Appendix A
Appendix B
Verification record of transmission type smoke meter
Evaluation of uncertainty of the result of verification of the smoke meter indication without difference (1)
JG 976—2003
Verification Procedure for Transmission Smoke Meters
This regulation provides the verification and testing of transmission smoke meters (hereinafter referred to as transmission smoke meters), and the finalization and testing of the performance of the meters in prototype tests. The performance of the meters can be tested in accordance with this regulation and the current standards. 2 References
33F 10591999
S01614
GB 3847
Compression ignition internal combustion engines - Measurement of light absorption ratio and determination of light absorption coefficient of combustion engines and vehicles equipped with compression ignition engines - Gasoline values of pollutants and tests using public standards. When using the public standards, attention should be paid to using the current valid versions of the above referenced documents. 3 Terms and measurement units
3.1 Light transmission ratio!
The transmission percentage from the light emitted by the fan to the instrument optical receiver is: X1%
The light received on the receiving wing of the measuring area filled with exhaust gas is: The light received by the light receiver in the measuring area is reduced by 1%. 3.2 Light absorption ratio 2
The ratio of the light passing through the air-filled channel to the instrument optical receiver is W=1-
3.3 Effective length of optical channel
The length of the channel from the light source to the instrument optical receiver is the length of the channel filled with air. The effective length of the channel can be calculated along the channel. The unit is positive. 3.4 Light smoothing coefficient
The coefficient determined by Beer-Lambiert is in units of ri-!.×mt-) - -
3.S Standard effective length of optical channel
× lnt- w)
The text is unfaithful, not measured, not doing things, and less maintenance (3)
JJG976—2002
In order to ensure the comparability of the measurement results of various smoke meters when measuring the base of smoke, smoke meters with different effective lengths of optical channels uniformly use 0.430 as the standard effective length of the optical channel for correction? . N, - 1 e(0.430 L1×M(I 4)
4 Overview
The smoke meter is an instrument used to measure visible pollutants emitted by compression ignition engines or cars equipped with compression ignition engines. It allows a certain amount of incident light to pass through a certain length of the smoke tray to be tested, and uses the intensity of the transmitted light received by the light receiving tube to assess the degree of visible pollutants emitted. 5 Performance requirements
5.1 Light absorption ratio W
5.1.1 Measurement range: at least (0~98.6)*. 5.1.2 Resolution: 0.1%.
5.1.3 Indication error 5.1.4 Zero drift: In one hour, the zero drift of the instrument shall not exceed ±1%. 5.1.5 Stability requirements for smoke meters: After 12 consecutive measurements of diesel vehicle free acceleration exhaust, the zero value of light absorption ratio shall not change by more than ±1%. 5.2 Light absorption coefficient 5.2.1 Measuring range: At least 0~9.9m 5.2.2 Resolution: 0.01m. 5.2.3 Inconsistency of indication: The value of the light absorption coefficient of the instrument shall be consistent with the value of the instrument. The difference between the light absorption ratio N and the light absorption coefficient calculated by formula (3) shall not be greater than [.115㎡ 5.2.4 Zero drift: In 1h, the zero drift of the instrument shall not exceed ±n.1m! 5.2.5 Stability requirements for smoke meters: After 12 consecutive measurements of diesel vehicle exhaust, the zero value of the light absorption coefficient shall not change by more than ±U.8-.
5.3 Response time of smoke meter circuit
The response time of the smoke meter circuit, that is, when the light sensor is fully covered by the light film, the display device The time required for the meter pointer or the effective display value to change from 11% of the full range to % of the full range should be (1.0+.1)65.4 The measured flue gas temperature displayed by the smoke meter
The error of the measured gas temperature display value of the smoke meter shall not exceed ±5:5.5 Smoke meter oil temperature measurement
For smoke meters with oil overflow measurement function, the error of oil temperature measurement indication shall not exceed ±5:5.6 Smoke meter speed measurement
The effective length of the smoke meter is measured from the internal to the external, and the length is 030. (4) The light extension ratio of the three lines is used as the ratio of the gas to the internal.
Note: The indication error of speed measurement shall not exceed +20/min at the speed of 600~[DX)/min, and shall not exceed ±50 r/min in other ranges.
6 General technical requirements
6.1 Appearance
6.11 The display instrument of the smoke meter shall have two metering parameters: light absorption ratio W and light absorption coefficient. The range of the two metering parameters is 0 when the light passes through the measuring area filled with clean air, and full range when the light path is completely blocked through the measuring area.
6.1.2 The smoke meter shall have a clear chrome plate indicating the name, model, factory number of the manufacturer, the metering instrument manufacturing license mark and manufacturing date; and the effective length of the light path shall be indicated. 6.1.3 The coating on the outer surface of the instrument should be uniform in color, without obvious defects such as chipping, scratches, dents, bubbles, cracks, etc. 6.1.4 The instrument display should be clear and without missing parts. 6.15 Various adjustment buttons and knobs should rotate smoothly and reliably, without any defects such as audible or inaudible noise. 6.2 For smoke meters in motor vehicle inspection stations equipped with computer control systems, the machine display value or its scanned value should be consistent with the smoke meter indication: For smoke meters with analog output, the machine display value or its printed value and the instrument indication should meet the indication error requirements, and the absolute value of their difference should not exceed the absolute value of the indication error requirements.
7 Control of measuring instruments
7.1 Verification conditions
7.1.1 Verification equipment
1.1.1. Five standard neutral optical sheets (the size of which shall be in accordance with the requirements of the instrument under test), 1.555m long, the transmittance of the measured value is approximately 71%, 50%, 34%, 27%, 2% respectively (for the instrument with an effective length of optical channel of reflection meter, it should be 84%, 71, 58%, 52%, 45%; the relative composite standard uncertainty of transmittance is not more than 0.3%
7.1.1.2 Universal counter. Time measurement range 10ns~10: Internal oscillation frequency accuracy 10-5~10-6. 7.1.1.3 Soft wire thermoelectric adjustment. Measurement range 10-[5]9: Class I, 7.1,1.4 Oil temperature grid. Temperature Chong 0.5C:
7.1.1.5 Digital display thermometer (resistance sensor). Measuring other countries 10~150C: resolution 0.19.7,1.1. 6 Tachometer, 0.1 level.
Test environment
7,[,2. "Relative sensitivity: ≤85%,
7.1.2.2 Temperature: 0~40℃
7.1.2.3 Power supply voltage: Ac (220±22)V. 7.1.2.4 The test is carried out in an environment free from light pollution, perturbation, noise and electromagnetic interference that may affect the measurement. 7.2 Qualification items
Test items see Table 1
Revision TH
Light consumption ratio
Light absorption coefficient
Calculation elasticity value and position I show the world a must make
Development of the film center of the European industry should be
Calculation demonstration was
Local planning energy creation
7.3 Qualification film method
7.3.1 Appearance inspection
JJG 976 -2002
List of inspection items
Hundred times
Film shrinkage
Number of used grids
Through daily measurement and company · fall, the specified storage environment content is inspected, and the calculation of the shell error limit is calculated. 7.3.2 Test of light absorption ratio and light absorption coefficient. 32. The actual instrument manual is set to start the machine and set the potential 7.3.2.2 Test of thermal drift
After the device is set, record the position, observe the reception every 2mn, and filter 3 times: within 1h, the maximum and minimum intervals between the values (including the previous time) are the test values: light absorption ratio and light change reception case are recorded, 1. The requirements of 5.1.4 and 5.3.1 shall be met. 7.3.2.3. The minimum value of light absorption ratio A shall be used to determine the effectiveness of the instrument. Use five standard neutral light films with transmittances of approximately 71%, 0%, 34%, 27%, and 20% (the light flux of the F device shall be calculated according to the length of the device, which should be approximately 4, 7%, 58%, 52%, and 45%), and take photos of the light films specified by the instrument. Read the corresponding light and the indicated value, repeat 3 times, and take the average of the indicated values 3 times as the value determination: Calculate the indicated value tolerance according to formula (5), and the average value shall be adjusted to the value specified in 5.1.3. N: -A.
A---the first measurement point, the light absorption ratio indication error: where
N--the first measurement point, the instrument should be the average of the three indications of the absorption ratio: 5)
4, the first avoidance point, the light absorption ratio corresponding to the standard neutral filter (for non-standard optical channel effective length changes, the meter should be corrected according to formula ()). 732.4 "Calculation of false correction coefficient: The validity test channel is carried out at the same time as the absorption ratio of 32.3, which does not make the current benefit test, and the light absorption ratio at different points is calculated based on the light absorption,
J.G97-22
absorption ratio and light absorption coefficient indication, and the invalidity is calculated according to formula (6) to form the full quantity.2 requirement A - k, - [-o.4snxIn.1- wj
First: Although the measuring point, the light absorption coefficient of the minimum value is not caused by the condition (take the absolute to!, m:
First: At the measuring point, the average of the three values of the light absorption coefficient of the meter, m; k
-First, at the deputy point, the average of the light absorption ratio of the meter. 7.32.5 The overall qualitative verification of the meter
: Repeatedly seek, chase the meter adjustment, and conduct continuous reverse measurement for diesel engines (diesel vehicles come out of this, please reach the fixed rotation, each drink is really controlled by the speed of the control time to avoid teaching, The value of the period should be consistent with the requirements of 5.1.5 and 5.2.5 (12 consecutive years of measurement process shall not change) 3.3 to come! The continental peak response currency will be the whole wave meter light absorption W running signal less constant through the dedicated circuit into the universal meter: the dedicated dumpling output circuit is used to dial the output signal of the meter to report the relative full and 90% of the amount of Tao to get the time display and you pass the juice number flash count: in the can see the meter should be full of invitations to the light ten, record the full war to the total cost of the Sichuan meter () calculate the measurement point only virtual time t -rcm-mif
; -effective inspection of the light absorption ratio of the combustion efficiency of the bottom of the grid% full of this process to% full of garbage difference between the general ratio of the number of:
a general opening number to solve the teaching time of the meter rate
through the safe inspection period meter to provide the proposal, the box machine sequence (connect every 20 shots or measuring points), the meter output signal directly in the meter wire machine industrial small, display and print the measurement reverse network, secretion! The circuit should meet the requirements of 53 stations: 7.3.4 Bing degree measurement to determine the effective temperature layer of the measured core when the state of the measured gas publication, in the sprinkler room let the other use the rescue line thermocouple lamp gas temperature Asia display south violation is: the recent change of the whole oil car in the summer to make it increase the gas in the range of 100 private about 150 a point state soft line thermocouple measurement to get the actual temperature low, safety formula () calculation should be set: monitor please meet the requirements of 54 3. = Y-- 1..
Wherein: a normal measurement point meter limit small beat was subsequently replaced by the indication difference of the temperature, heart: a training time meter shows the measured smoke temperature love,: - the first welcome to teach me the false measurement to get the actual humidity, "7.3.5 frequency dynamic temperature measurement personnel calibration
anti-temperature measurement indication value material benefit oil machine temperature file benefit digital service temperature let! Sell out the long sensor age) method a risk: material variable meter oil humidity measurement benefit special sensor and digital temperature meter electric Yang transmission etc. from the full oil supply alliance plant, through the planned oil temperature file temperature in 70,: a point calibration. Note the tear meter measurement coupon Qiao send forbidden connection formula () trial calculation, should be responsible for 5.5 double request
3.: - Y - F..
or: a first measurement wall point smoke meter edge temperature measurement and indication difference,: 19:
JJG 976--2002
Y-At the first measuring point, the display value of the combustion meter oil temperature measurement sensor is summarized; at the second measuring point, the display value of the digital display thermometer (platinum resistance sensor) is summarized. 3.6 Verification of speed measurement of thermometer
The speed measurement sensor of the thermometer to be tested shall be placed at the specified position of the vehicle according to its requirements. A reflective target is attached to the exposed shaft of the diesel engine, and a tachometer is used to align the reflective target: When the diesel vehicle is started and reaches the measuring points of about min and about 3000/min respectively: Take the tachometer and the smoke meter to be tested, and calculate the minimum error of each tachometer measurement according to formula (10): It should meet the requirements of 5.6, 4.. =n, - nu
In the formula: 4—the smoke meter speed measurement error at the first measuring point, rmi: n, the smoke meter speed sensor display value at the first measuring point, rmi; —the tachometer display value at the first measuring point, ni. 7.3.7 When the smoke meter (10)
in the motor vehicle inspection station equipped with a computer control system is conducting the light absorption ratio and light absorption coefficient indication error calibration, observe and record the computer display value or its printed value and the smoke meter position indication value, which should meet the requirements of 6.2. 7.4 Verification Result Processing
A verification certificate shall be issued to smoke meters that meet the requirements of this Regulation after verification; a verification result notice shall be issued to smoke meters that do not meet the requirements of this Regulation, and the names and data of the non-compliant items shall be listed. 7.5 Verification cycle
The inspection period of smoke meter shall not exceed 1 year in general. 6
Appendix A
Apparatus model
Light path length
Control unit
Calibrator
JJG96—2002
Remote smoke meter calibration record
Production unit
Light absorption output quantity/group
Age calibration date
Calibrator
Manufacture date
Input number
Light absorption coefficient display range/minute
Calibration temperature!
Control humidity
Eliminate wrong brand, indicate name, model, production unit, etc., and indicate effective length of light flux. The outer surface of the instrument should be uniform in color, without obvious thorns, paint teeth, pits, bubbles, cracks and effective performance. The display of the instrument should be clear and without defects. The various knobs and buttons should be flexible to rotate and work properly. Equipped with computer differential system. The weighted display value and computer display value (or print position) virtual full distance analyzer display value. The ratio of light absorption coefficient is marked on the incident light absorption ratio. 20 mirt
40 mnin
60 crin
maximum channel
indication error
light absorption coefficient indication value light-to-temperature ratio N indication value W converted into corresponding light absorption coefficient + value inconsistency difference light absorption number
smoke meter tax
qualitative inspection case
inspection internal abandonment
inspection circuit kidney risk time three
smoke temperature display value
cat measurement
speed Xie Appendix H G76—2002 Establish a mathematical model for the uncertainty assessment of the indication error of smoke meter and list the uncertainty of the result. When calibrating the indication error of smoke meter light absorption ratio: use the standard neutral filter as the standard. "When the standard neutral density filter is used to reduce the transmission, the light absorption ratio indication of the smoke meter is taken as the value error: the light absorption ratio indication of the smoke meter is calculated according to formula (B) (the light absorption ratio indication of the standard neutral density filter is the standard transmittance of the standard neutral density filter, and the difference between the smoke meter and the output is the number of the output gain). AN-(I--)
In this formula:
The light absorption ratio indication error of the smoke meter:
The light absorption ratio indication of the smoke meter:
The standard transmission ratio of the standard neutral density filter is not related to: and is not as good as the fixed formula: nI4) =cnr\(A)+ e,u,(r)
In this formula: c=a3/4-1
ri-aa/dt-1.
Therefore, the uncertainty formula is:
(4)- u2(n1-m,(-)
H.2 Uncertainty of the measured value
H.2.1 The measured value of the measured value (measurement non-repeatability) () in
The measured value of the measured value (the error)
u(w)-u
B.2.3 The standard error ratio 7
.? Uncertainty evaluation of the input value
31 is increased Accuracy: W indication position estimation (measurement uncertainty) standard with uncertainty assessment (H1)
glass smoke meter with uncertainty value rising source. The measurement value of the meter is not electrically complex. The annualized error of the indication of this instrument: The measurement is not single-image and can be obtained by continuous measurement. The data is processed and the experimental standard error is obtained): 5V -[2 - N / -1 =0,15%
In actual measurement, the complex parts in the car are tested three times in succession. The arithmetic step value of the three tests is used as the measurement disk. Then the standard uncertainty can be obtained:
,(N) = s(W/3 = 0.09%
B.3.2 Evaluation of the standard uncertainty of the indication estimate file (digital data difference) of the inspected additional measuring instrument A
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