Some standard content:
ICS17.200
Machinery Industry Standard of the People's Republic of China
JB/T 9240—1999
Colorimetric Thermometer
Two-colourthermometer
1999-08-06 Issued
National Bureau of Machinery Industry
2000-01-0t Applied
JB/T B24G—1999
This standard is in accordance with 7.BN1116—894 colorimetric thermometer. There is no difference between this standard and ZBN1016-9 in the main technical content. Only the original standard has been revised in terms of logic. The annex to this standard is the standard appendix.
This standard replaces ZBN1016—89 from the date of implementation. This standard is proposed and coordinated by the Industrial Process Measurement and Control Standardization Technical Committee. The main drafting units of this standard are: Shanghai Industrial Automation Research Institute, Fan Wang
People's Republic of China Machinery Industry Standard
Thermometer
Two-colour thermometer
This standard specifies the technical requirements and test methods for colorimetric thermometers (hereinafter referred to as colorimetric thermometers). This test is applicable to colorimetric thermometers with a temperature range of 200℃-3200℃. This standard does not apply to multi-color thermometers and two-colour thermometers using differential operation. 2 Reference Standards
JB/T 9240-1999
23161689
The following clauses are included in the following annotations and are added to this standard by being cited in the single standard. When this standard is published, the versions shown are valid. All standards will be revised to make it possible for all parties to the standard to use the latest versions of the following standards: G1546-1995 Applicable technical conditions for packaging of instruments JB/T9329-1999 Standards for instruments, basic environmental conditions for instruments and gas signatures 3 Specifications
The following definitions shall apply to the standards.
3 Two-colour thermometer: Thermometry: A device that measures temperature based on the functional relationship between the ratio of the spectral radiation intensity of the measured object at two wavelengths (or narrow bands) and the sensitivity. It usually consists of one (single channel) or two (effective channel) detection elements, optical systems, display elements and other electronic units, and a standard configuration.
3.1.1 Detection element detector
A device used to collect the radiation intensity of the object. 3.1.2 Optical system The whole composed of optical parts for convergence, separation and treatment in a certain relationship. 3.1.3 Display unit Displayer The unit used to indicate and record sensitive temperature in the thermometer. It can be an inseparable part of the temperature sensor. It is a display table matched with the thermometer.
3.2 Working band length tunds
The range of the two corresponding wavelengths of the thermometer. 3.3 Measuring distance measuring distance The distance from the object to the thermometer.
3.4 Distance coefficient distance factor The ratio of the measuring distance to the object to be measured required by the distance, symbol C. 3.5 Design distance designdiatance
The measuring distance that meets the requirements of the distance coefficient of the meter specified by the natural gas industry inspection institute. 3.6 Neutral absorption neutralshaarpion
Approved by the State Administration of Industry and Commerce on August 6, 1999 and implemented on January 1, 2000
Non-selective absorption of radiant brightness.
JB.T 9240--1999
3.7 Response time regparsetine
When the temperature changes step by step, the time required for the meter to adjust the change to a specified percentage of the step change. 4 Product classification
4.1 Basic parameters
4.1. 1 Temperature range
The temperature range of the meter is divided into single measurement range and multi-bay measurement range. The measurement range should be indicated in the manual. 4.1.2 Two working bands
The two working ranges of the thermometer should be indicated in the user manual. 4.1.3 Measurement distance range
The measurement distance range of the thermometer should be indicated in the instruction card. 4.1.4 Distance coefficient
The distance coefficient of the thermometer can be taken from the following values: 1.5.2.5, 4.0, 6.0, 10, 20.25, 40, 50, 60 100, 150, 250.300.400.600 1000.2500 m
4.1.5 Output signal
The output signal mode of the thermometer is divided into effective signal and reading signal, among which the analog DC current signal is 4mA~2n14 or (rn4~[0m4: converted to pseudo DC Voltage signal is 1- or 0-104.2 Structural type
4.2.1: Classification by installation method
The mass meter installation method is divided into fixed type and data belt type. 4.2.2 Classification by number of channels
The number of data channels is divided into single channel and double channel. 4.2.3 According to the optical system composition and convergence method, the thermometer is divided into anti-point type, refraction type, composite or optical fiber type according to the optical system composition. ) The original nuclear sharp space method is divided into modulation type and non-combustion type. 5 Technical requirements
5.1 Normal working conditions
The normal environmental conditions of the temperature range are as follows:
Temperature range: 5t-40%;
Relative humidity: 10%75%;
Atmospheric pressure: 86kPa=106Pa
Avoid strong alternating magnetic fields during operation. 5.1.2 Power supply
The meter should be powered by an AC power supply or a DC power supply with a nominal value of 220V, 50H. 5.1.3 Other conditions
The meter with a water cooling device or equipped with an attached water cooling device should be able to operate normally in an environment below 100% after passing through cooling water with a temperature not exceeding 35°C.
Note: The display unit can be separated. 5.2 Technical requirements related to the accuracy of the measurement range
5.2.1 Basic error limits
JR/T 9240-1955
The basic error of the agglomerometer shall be expressed as (%/°C), which is the upper limit of the measurement range, 0.5, 1.0, .5, and the value shall be indicated in the instruction manual. For thermometers under different measurement ranges, different values are allowed for different ranges: 5.2,2 Repeatability error
The repeatability error of the agglomerometer measuring the same humidity shall not be greater than 1/3 (%:°C). 5.3 Technical requirements related to the influencing quantity
5.3.1 Change in the effective diameter of the measured object
5.3.1.1 When the effective diameter of the measured object corresponding to the distance is reduced by 20%, the change in the agglomerometer indication shall not be greater than (%:°C)°C. 5.3.1.2 When the effective diameter of the object corresponding to the set distance is enlarged by 50%, the temperature change should not be greater than 1/3. 6.3.2 Measurement distance 5
5.3.2.1 When the distance between the measured object and the leakage pressure gauge is greater than the set distance, the change in the measured distance should not be greater than [/4, 5]. 5.3.2.2 When the distance between the thermometer and the measured object is less than the set distance, the change in the measured distance should not be greater than [/2 r/m
5.3.3 Neutral absorption
Between the temperature gauge and the measured object, the radiation absorption of the measured object shall be uniform, and the change in the thermometer indication shall not be greater than (r% 5.3.4 Ambient temperature When the ambient temperature changes from a constant temperature within the range of 20°C to any temperature within the range of 5°C to 40°C, the change in the ambient temperature causing the change in the thermometer indication should not exceed 12%, 5.3.5 When the external magnetic field is AC 400%/50Hz and the field intensity is the most unfavorable direction, the change in the thermometer indication should not be greater than 1/2(n%L)C. 5.3.6 Power supply time When the power supply temperature and frequency of the direct current power supply are as required, the change in the temperature indication should not be greater than 1/2n%·)℃. 5.3.6.2 Power supply interruption
When the AC power supply interruption time is 20m, the change of the thermometer indication value should not be greater than (n%: 5) 5.3.6.3 Power supply drop
When the AC power supply voltage drops to 75% of the common shift value for 5s, the change of the thermometer indication value should not be greater than (n%·T, 5.3.6.4 Power supply transient overvoltage
When the peak value on the main power frequency reaches 200% of the effective value of the main power supply voltage, the thermometer indication should not change much (more than +.?℃.
5.3.7 Points of principle
The indication drift of a fixed-mounted hygrometer should not exceed 13%-. 5.3. The indication drift of a belt-type hygrometer after power-on for 1 minute and continuous operation for 1 hour should not exceed 1/3n·5)%. 5. Other technical requirements
5.4.1 Safety
5.4.1.1 Insulation resistance
When the ambient temperature is 15℃~35℃ and the relative humidity is 45%-75%, the insulation resistance between the power terminal and the shell of the thermometer powered by AC power supply should be not less than 20M0.3
5.4.1.2 Insulation strength:
JB/T9240—1999
For a thermometer powered by AC power supply, the shell and the power input terminal should be able to withstand an insulation strength test of 1500V AC for 1 minute.
5.4.2 Response time
The response time of the thermometer should comply with the value provided by the manufacturer in the instruction manual. 5.4.3 Working pressure of water-cooled device
The water-cooling device of the thermometer itself or the additional water-cooling device should be able to withstand the working pressure test of 0.3MP. 5.4.4 Operation, transportation and storage conditions After the test of transportation, storage and replacement conditions, the meter shall meet the requirements of 5.2.1, 5.4.1.1 and b1.5 in 5.4.5. 5.4.E Matching quality and appearance
1 Mixing 5 The difference between each part shall be correct and there shall be no missing parts; the shell and parts of the meter shall have good surface treatment and shall not be rusted; b!
The objective lens and mirror of the temperature sensor shall be intact, the magnetic system shall be clear, and the markings in the system shall be in accordance with the standard:
The switches and buttons of the meter shall not have poor contact; the bottom of each connector and connection terminal shall be clearly marked. 5.4.6 The display meter matched with the short circuit meter shall meet the requirements of the relevant standards: 6 Test method
6 1 Cloud adjustment conditions
6.1.1 Environmental conditions
6.1.1.1 Reference atmospheric conditions
The reference atmospheric conditions for the test shall be tested under the following atmospheric conditions: Recession: 20
Volume 2: 60%-70%:
Atmospheric pressure: 85kF-1062s
6.1.1.2 Atmospheric considerations for one stage of the test
The test does not need to be conducted under the reference atmospheric conditions: The test shall be conducted under the following atmospheric conditions: Temperature: 15℃35℃1
Volume 3: 45%-5
Atmospheric pressure 8Fa10kFa
6.1.1.3 Other environmental conditionswww.bzxz.net
Except for the strips in 6.1.1.1 and 6.1.1.2, the test shall also be conducted under the following environmental conditions. Field: Except for the silicon field, the other fields are small enough to be ignored; Dynamic: The effect of mechanical vibration on the thermometer is small enough to be ignored; Lighting: Except for a certain lighting, the effect of other light sources on the thermometer is small enough to be ignored. 6.1.2 Power supply voltage
6.1.2.1 Nominal diameter
According to the provisions of the relevant standards:
White.12.2 Yuan coupon
Space: full visual electric micro=, direct current: 5%: 4
Frequency: +1%:
Filter distortion: small cloud 5 record (AC power supply); winding speed: small hand 0.2% DC power supply)
6.1.3 General provisions of the test
JH/T 92401999
Unless otherwise specified in this standard, the test shall comply with the following general provisions: a! The thermometer is placed in the test site: h) After the thermometer is powered on, it should be preheated in accordance with the manufacturer's regulations. If the manufacturer does not make any regulations, it should be preheated for 3 krn:) The effective emissivity of the radiation source during the test should be less than 0.00 ± 0.D15. The target diameter of the radiation source (the diameter of the spherical radiation source) should be greater than or equal to 0.25 of the effective diameter of the object. d) When the emissivity correction unit is provided in the thermometer, it should be set to 1.e! The design of the horizontal table is based on the original design, and the radiation source is inserted. Use a suitable standard meter and measure the radiation source temperature according to the corresponding reading rules. In each test, the order of reading the radiation source temperature and the thermometer indication is: source temperature + thermometer value → thermometer indication + source temperature. The difference between the two readings before and after the source temperature is lowered should not be more than 2. g) Before the test of 6.2.3, 6.3.2, 6.3.3, 6.3.4 and 6.3.5, the temporary radiation source should be deducted. 6.2.1 General Principles ...
A=l,-1
6.2.2.2 The temperature points to be inspected shall be the whole degree Celsius points of the thermometer measurement range. One inspection point shall be added every 10 degrees from the lower limit to the second limit. If necessary, the number of inspection points may be reduced, but shall not be less than three. The deviation of each inspection temperature point from 100 degrees Celsius shall not exceed +5. 6.2.3 Reproducibility error
6.2.3.1 The temperature points to be inspected shall be the appropriate points near the middle value of the measurement range. 6.2.3.2 The temperature change of the radiation source should be kept sufficiently stable. Under the same test conditions, record the temperature of the radiation source and the indication of the thermometer for each product. The measurement should be repeated for more than 10 times. When the measurement is not completed, the thermometer should not be powered on. The radiation source can be operated without interruption. Repeat error (2) is calculated:
Where: repeatability error of the thermometer, ℃: the indication of the thermometer for the first measurement (=1.n) T——the average value of the indication of the thermometer for the first measurement ℃: n——the number of measurements.
B.3 Influence quantity test
3.1 General
Unless otherwise specified by the standard, the influence quantity test is only carried out at the central point around the range of the measurement. The influence of the quantity on the solid meter 5
JB/T9240-18899
is determined by the average value of the test results repeated three times in the same test. Black body radiation source or non-black body radiation source can be used. Except for 6.3, 8 and 6.3.9 of this standard, the impact test can be carried out under normal atmospheric conditions. When testing the retrograde impact of tungsten filament lamp radiation source, the test point can be a few points near the upper limit of the measurement range. 6.3.2 Effective diameter of the object to be measured 6.3.2.1 Select a black body radiation source that can meet the effective directivity of the source target corresponding to the thermometer height coefficient, or a non-black body surface source with a larger area shielded from the atmosphere and a temperature unevenness of not more than (%). 6.3.2.2 Place a non-reflective variable light source near the black body temporary radiation source or the non-black body surface envelope for testing, and ensure that the variable light source is not hot. The temperature change meter is a variable light course, when the two variable light sections are divided, the effective diameter is equal to the coefficient of the difference between them. After the source temperature is determined, record the value of the input source temperature, the variable light section is equal to I.SDs and 0.3s. Record the auxiliary source temperature and the meter value, the error of the variable light diameter is 1.5D: and 0.80 when the error of the meter is the variable light diameter D; the deviation of the temperature-sensitive product value is the change of the effective diameter of the measured object. The calculation can be carried out according to (3) and (4): 20. = t.1-fm
, - the influence of the expansion of the effective diameter of the object, ℃: in:
. The influence of the effective diameter of the object on the small diameter of the object, tm-the effective diameter of the measured object! .5D; when the thermometer is used. C.: I:
The effective diameter of the object being measured is 0.8D, the thermometer shows, C; when the effective diameter of the object is 0, the thermometer shows, 6.3.3 Initial measurement is
6.3.3.1. When the distance test is carried out, the temperature meter is non-ignitable. When the temperature meter deviates from the design distance, the effective diameter of the radiation source target surface shall be calculated as follows:
). If the test is carried out from the design distance to the direction greater than the design distance, the effective diameter of the radiation source target surface shall meet the requirements of (5): F(D+d-dr
h). When the test is carried out from the design distance to the direction less than the design distance, the effective diameter of the radiation source target surface shall meet the requirements of (6): O
Formula F:
-(Dd design distance, mm)
-(Dd +d
L——the height of any distance between the two grids, mD, the effective diameter of the object corresponding to the thermometer distance system, mm: d thermometer effective diameter of the object, m;
D, ---: the effective diameter of the target surface of the radiation source when the distance between the objective lens and the source is 1, mm. 6.3.3.2 The effective diameter of the source surface is calculated by formula (7): L
or D thermometer effective diameter of the radiation source when the distance between the objective lens and the source is 1, mm, any distance between the objective lens and the source during the test,
Distance coefficient
6.3.3.3 The radiation source is first aligned at the designed distance, and the temperature indication is sent out. The measured sink height is changed in sequence, and the change of the measured sink distance and the change of the temperature indication are recorded at the same time. The test result table can be calculated according to formula (3):
1000·
JB/T 92401999
Wherein: 2s is equivalent to the change in the reading of the thermometer when the measuring distance changes by 1m, /m: \—The change in the reading of the thermometer caused by the change in the measuring distance,; —The change in the height of the measuring distance, mm.
6.3.4 Uniform absorption
6.3.4.1 Use a chemically treated black wire mesh as the laser wire mesh, and the ratio of the side length of the small square of the wire to the diameter of the wire should be 4.4. 6.3.4.2 After the radiation source is inserted and the thickness is determined, record the temperature of the radiation source and the reading of the thermometer. Finally, place the wire mesh at the opening of the auxiliary source, and then record the temperature of the radiation source and the reading of the thermometer. The difference in the reading of the thermometer corresponding to the same radiation source temperature after the wire mesh is released is the uniform absorption effect. The calculation can be carried out according to (9): ||tt ||Where:
, average absorption effect C:
, the thermometer indication after the effect is placed, B; the thermometer value before the effect is placed, ℃, 6.3.5
6.3.5.1 Use the water cooling device with constant temperature to change the environmental resistance of the thermometer. The temperature can be measured by the thermometer with the thermometer in reverse. 6.3.5.2 When the environmental temperature is tested, the ambient temperature (standard value) and test number of the thermometer are: +20℃, +30℃, +40℃, +10℃, +5℃. The actual temperature is allowed to deviate from the nominal value by ±2℃. 6.3.5.3 After the radiation temperature is stable, change the environmental pressure of the thermometer. At each temperature, there should be enough time for the thermometer to reach thermal equilibrium. Then, take the thermometer indication and the radiation source temperature. When calculating the influence of ambient temperature, the thermometer indication at 20°C = 2°C is used as the standard. The difference between the thermometer indication at other ambient temperature test points and the ambient temperature influence is the ambient temperature influence. The specific calculation can be carried out according to formula [10): a-e
Formula: Ambient temperature influence, /10℃:
-. Thermometer circulation temperature nominal value is 209°C, the leakage meter indication value; Thermometer ambient temperature nominal value is 5%, 10%, 30%, 40%℃, the leakage meter indication value.℃: 5-Actual ambient temperature when the thermometer circulation temperature nominal value is 20°C, 1°C: 1-Actual ambient temperature when the thermometer ambient temperature nominal value is 5%, 10%, 30%, 40°C, 6.3.6 External magnetic field
6.3.6.1 The test is carried out in a generator that can generate a field strength of 400A/m. The radiation source can be a radiator. During the test, the source should be kept connected. 6.3.6.2 Install the thermometer and the auxiliary radiation source on the ring of the silicon field intensity generator at the same time. After the auxiliary radiation source and the thermometer are in normal working state, first record the value of the thermometer when there is no external magnetic field, then increase the external magnetic field to 4004/m, change the direction of the field (F-360F) and the phase of the magnetic field (0360), and then record the value of the thermometer at this time. The difference between the two is the external magnetic field effect, and the specific calculation can be carried out according to the formula I): A.-ll-te
In the formula:. External magnetic field effect is eliminated, C;
, the thermometer indication when there is an external magnetic field, C; u——the thermometer indication when there is no external magnetic field, ℃. 6.3.7 Power supply variation 6.3.7.1 Main power supply The main power supply can be a cumulative fire source or a tungsten filament lamp. During the test, the frequency of the voltage of the AC power supply or the voltage of the DC power supply shall be reversed according to the table below. --1999
nominal declaration
nominal has
nominal value
110% of the nominal value
85% of the nominal value
110% of the nominal value
85% of the nominal value
public value
110% of the nominal value
public age 85 to
nominal wire
105% of the nominal straightness
nominal 95
public species
105% of the nominal raw material
public 105
nominal bucket front 95%
95% of the nominal support
! Record the temperature readings when the voltage and frequency are nominal and the power supply changes respectively. The difference between the two is the power supply change effect. The specific calculation can be calculated according to formula (12): Aa-t
wherein: the main power supply voltage is slightly affected;
the temperature reading when the power supply voltage is nominal, blank: · power supply voltage, the temperature reading when the power supply voltage is nominal. 6.3.7.2 Power supply interruption
The radiation source can be changed to a filament lamp. The radiation source should be kept constant during the test. When the power supply is interrupted for 20ms
, the following data should be recorded during the test:
a) the maximum instantaneous change of the temperature reading;
b) any permanent change of the temperature reading
The larger of the two values is the power supply interruption effect. 6.3.7.3 Power supply drop
The radiation source can be a solid radiation source or a filament lamp. The radiation source should be kept stable during the test. The power supply voltage is reduced to 75% of the nominal voltage and maintained for 5 seconds. During this process, the instantaneous change in the thermometer indication is the power supply drop effect. 6.3.7.4 Power supply overvoltage
The radiation source can be a soft body radiation source or a filament lamp. The radiation source should be kept stable during the test. -(12
The peak voltage superimposed on the main power supply is generated by the power supply, the energy of the capacitor is 0.1J, and the amplitude of the peak voltage is 200% of the main power supply voltage value.
The main power supply line should be protected by a suppression filter including a current suppression circuit of at least 500H. During the test, two pulses should be applied, and their phases are the same as the peak voltage of the main power supply. F pulses with the same phase frequency as the main power supply are applied.
Any instantaneous and permanent changes in the measured signal during this process are the effects of overvoltage. 6.3.8 Points
5.3.8.1 Carry out under reference atmospheric environment conditions [B/T 9240—1999
6.3.2.2 The radiation source temperature is set at the inspection point, and the radiation source temperature and the initial value of the thermometer indication are recorded respectively. Thereafter, the thermometer is continuously operated, and during the comparison period, the radiation source temperature and the thermometer indication are recorded every h. The calculation of the stable indication source is carried out according to formula (13), and the indication value once it is large can be used as the point drift,
Ai- [tni-(t si-tsn] -thd
in the following points:
is the best value of the thermometer indication, which is the indication of the thermometer at the first measurement (=,.,R), and is:
is the initial value of the temporary source temperature, which is the frequency of the radiation during the first measurement (1,.,n).C. 6.3.9 Starting standard
6.3.9.1 Continuous comparison of atmospheric environmental conditions 6.3.9.2 Check the lower limit of the measurement range of the thermometer. The thermometer with multiple measurement ranges is only tested for one of the smaller measurement ranges. (13
6.3.2.3 The temperature of the radiation source is set at the lower limit of the temperature range. After it stabilizes, turn on the power of the thermometer. After power on for 1r and Lr, record the temperature change of the thermometer and the radiation source temperature respectively. The initial drift can be calculated by the formula:
27=[t-(t1-1]-1
Where: 22—initial source drift,;
initial value of the thermometer indication, summary:
fr:-—error of the thermometer indication when power on th, T;is ——-radiation source temperature constant, ℃;1. Power on Lh, the temperature of the radiation source,
6.4 Other tests
6.4.1 Safety
6.4.. Insulation resistance
Measure with a rated DC current of 500 megohms- 14) During the test, the thermometer should be powered on, the thermometer power switch is in the on position, the self-terminal is connected, and then the terminal resistance between the source and the external transformer is measured.
6.4.1.2 Specifications
, the thermometer should be powered on, the thermometer power switch is in the off position, then the no-load voltage of the test equipment is set to the minimum, and the two ends of the test equipment are connected to the power input terminal of the thermometer and the temperature shell respectively. The power of the test equipment is connected to the center voltage drop of no more than 75V. During the test, the test voltage is from 1500V to 1500V, and the voltage is maintained. There is no breakdown or tension, and then the test voltage drops steadily to zero, and the test voltage is cut off. Power supply. 6.4.2 The response time
shall record the time when the change in the meter indication is equivalent to 95% of the temperature step change. During the inspection, the response time of the temperature signal generator shall not exceed 1/5 of the response time of the temperature being tested. The recorded response time is the average value of at least three measurement results of the same test. The deviation of each re-test from the average value shall be within 1%. The inspection point of the response time shall be selected from the point in the measurement range of the temperature range to the nearest integer of 100 degrees Celsius. 6.4.3 Working pressure of water cooling device
Where the temperature sensor is equipped with a permanent cooling device and a humidity sensor, a water cooling device shall be installed and a working pressure test shall be carried out. During the test, the test time shall be 9
JE/T 9240-1999
Formal five, the water cooling performance of the power reached U.3APa, the film error held 5nun death to observe whether the water cooling device has leakage, deformation. 6.4.4 Transportation, transportation, transportation, and transportation are recommended to be carried out in the following order, and the collision and silence tests are carried out according to the provisions of JB9329 A. Drop high quality [0b! The provisions of JB/T9329 reverse low diarrhea test, low test The temperature is -5℃±2℃, and the temperature is set under working condition for more than 24h.
) After the two tests of a), the basic error, insulation resistance and external gauge are checked in accordance with the provisions of 6.2.3, 6.4.t.1 and 6.4.5.2.
6.4.5 Assembly quality and appearance
6.4.51 The inspection of the assembly quality of the thermometer (5.4.5 a)) shall be checked against the drawing. 6.4.5.2 The inspection of the external gauge of the thermometer (5.4.5 b), e), e1) can be carried out by the macro-micro method: 6.4.5.3 The switch of the thermometer (5.4.5 di) can be checked with a multimeter. 7.1 General Inspection In order to check whether the thermometer meets the technical requirements of this standard, each hygrometer must be inspected before delivery. The thermometer products with different types and measuring ranges shall be sampled and inspected. 7.2 Factory Inspection The factory inspection shall at least include the following items. The order of the inspection items shall be determined by the manufacturer. a) Basic error: b) Neutral absorption: e) Increased continuity: d) Insulation strength: 3) Assembly quality and appearance.
7.3 Type inspection
7.3.1 Applicable scope of type inspection
New products are tested and identified during production; after production, if there are major changes in structure, materials, and process, which may affect product performance: Periodic quality supervision of normal production:
When the product is stopped for a long time and then resumed:
When the inspection results are significantly different from the previous type inspection:
The national standard 5 cylinder machine has exceeded the requirements for type inspection. E
|7.3.2 Sequence of type inspection items
The whole type inspection includes all the following items and is carried out in the following sequence. transportation, transportation storage basic environment conditions; b!
assembly quality and appearance;
this error:
) blue complex error:
starting class displacement or point Qian;
the effective diameter change of the measured object:
it measures the distance,1. Applicable scope of type inspection: new product testing and identification of new product; after production, if there are major changes in structure, materials, and process, which may affect product performance: periodic quality supervision of normal production: after long-term suspension of production, when production is resumed: when the inspection results are significantly different from the previous type inspection: the national 5 cylinder machine has exceeded the requirements for type inspection. 7.3.2 Sequence of type inspection items: the whole type inspection includes all the following items and is carried out in the following order. transportation, transportation storage basic environment conditions; b!
assembly quality and appearance;
this error:
) blue complex error:
starting class displacement or point Qian;
the effective diameter change of the measured object:
it measures the distance,1. Applicable scope of type inspection: new product testing and identification of new product; after production, if there are major changes in structure, materials, and process, which may affect product performance: periodic quality supervision of normal production: after long-term suspension of production, when production is resumed: when the inspection results are significantly different from the previous type inspection: the national 5 cylinder machine has exceeded the requirements for type inspection. 7.3.2 Sequence of type inspection items: the whole type inspection includes all the following items and is carried out in the following order. transportation, transportation storage basic environment conditions; b!
assembly quality and appearance;
this error:
) blue complex error:
starting class displacement or point Qian;
the effective diameter change of the measured object:
it measures the distance,
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