Some standard content:
Verification Regulation of MohileDetectdng Mete\ of Temperature Circuit Detector
JJG 718--1991
Verification Regulation of MohileDetectdng Mete\ of Temperature Circuit Detector Teniperalnre...
This verification procedure was approved by the State Technical Design Institute on March 4, 1991, and will be implemented on November 1, 1991. Responsible unit: Shandong Provincial Standards Bureau
Drafting unit: Shandong Provincial Standards Research Institute This regulation is issued in accordance with the technical provisions. The drafting unit is responsible for interpreting this regulation. The main drafters:
Sun Qulan (Shandong Metrology Science Research Institute) Ming (Dongzhi Metrology and Measurement Research Institute)
Participating drafters:wwW.bzxz.Net
Li Zhouxie (Shandong Metrology Science Research Institute) Zhao Yuanxing (Shandong Dezhou Instrument Factory) 105
Technical requirements
Qualification
Verification items
Verification method
V. Treatment of verification results
Appendix 1 Group return verification record format Example of temperature return detection and recording
Except for the example 2
Temperature circuit detection instrument verification procedure
This procedure is applicable to the newly manufactured, replaced and repaired temperature terminal circuit detection instrument (hereinafter referred to as temperature circuit detection instrument): the measuring range is 5T-15, with analog/digital converter, digital display, L) and L digital display or CR-display. The temperature circuit detection instrument is composed of sensors, display and recorder. Its measuring current source: the output of multiple sensors (resistance, electric or 1 junction electric bed, etc.) changes with the change of overflow, and the output signal is changed to a uniform specification. It is remotely selected by a color circuit or switch (semiconductor or relay), and then the analog/digital conversion is completed. The digital signal of the conversion chip: after the digital circuit or payment After the machine and foreign level are processed, the display and recording mechanism are edited and periodically trained. The recording method of the leakage detector is automatic printing, automatic printing and non-printing. Technical requirements: 1. Appearance: 1. Inspection instrument manufacturing name or mark, number, accuracy level, manufacturing month and accompanying mark, 1.2 Inspection instrument appearance should be intact, and the symbols and signs, graphics, laser and physical codes, etc. that describe the functions should be in accordance with the standards and clear, and the main: the inspection instrument should not have obvious marks, injuries, cracks, deformations, etc., and the surface should not be in accordance with the specifications, cracks and peeling, and the bottom of the metal should not have embroidery and other machine grips. 1.3 Inspection instrument service department is located in 1.4 The sensor (metal or plastic) must be tightly fitted. The leads must be in good contact, especially the solder joints. The sensor can withstand the corresponding operating temperature. 1.5 The display function inspection should be carried out under the condition of return to the source. The displayed numbers and images should be clear and uniform. There should be no missing units or other phenomena. The decimal point and status display should be normal. 2. The temperature measurement function should be in negative range. When the measurement is below the range, the instrument displays the "failed" signal. If there is an alarm, an alarm will be issued at the same time.
3 The basic error (tolerance) of the indication value in the case of an error
situation shall not exceed the indicated error limit (the indicated deviation technical error limit shall be expressed in the following forms: 3.1 The output range and quantitative unit related to the measured value shall be expressed in the following forms: Am= ± (%FS+)
Wu Zhong: 2
Allowed evaluation and demonstration of the basic wood case (discipline)
2-Inspection accuracy level;
FS-Invitation to the detector output code:
Ratio-the value represented by the last digit of the information (); 3--The error coefficient generated in the digital process, generally 13.2 points to the measured error in the display:
Formula: R
4 Resolution
The absolute error ().
The value represented by the last digit of the minimum value is in accordance with the requirements of the detector manual. The result of the small inspection should be less than or equal to 10% of the resolution value, 5 Inspection cycle||tt| |The time from the first pass inspection to the next pass after the inspection is -· follow-up inspection period. The inspection limit is 4 inspections per day on all passes. The inspection time should be in accordance with the requirements of the instrument instructions. 6 Stability
Maximum fluctuation of the displayed value
The fluctuation of the displayed value of the inspection instrument shall not be greater than its resolution. Function resolution (%FS>10) The fluctuation of the displayed value of the inspection instrument shall not be greater than 2 grid resolution, (.2 short coal equal point source shift
The maximum value of the equal point source shift of the inspection instrument within h shall be less than 1/4.7 of the allowable minimum basic error
The resistance
is under the conditions of ambient temperature of 15~35℃ and relative humidity of 45%-75%. Under the following conditions, the insulation between the probe and the shell, the input terminal and the power terminal, and the input terminal and the shell (except for the probe where the input terminal and the shell are not insulated) of the probe should be greater than 20M
8 insulation strength
. Under the conditions of environmental humidity of 15~35℃ and relative humidity of 45%~75%, the probe shall be subjected to the following test voltages at the following terminals and maintain [mn: no failure, voltage drop and spark appear. The probe shall be able to work normally. Power supply: fully charged: 1500V, input terminal: 500V (except for the probe where the input terminal is not insulated), newly manufactured and maintained remote probe, The technical requirements of Articles 1 to 8 shall be met. The test instrument in use shall meet the technical requirements of Article 6. The product manual must be attached when using it. Three standard conditions 10 Standard chain and standard equipment 10.1.1 Second-class standard water-based thermometer (-00:1.1.2 Second-class standard water-based elliptic thermometer (-150:1.1) Standard instrument with the same accuracy and matching electronic equipment: 1.3 10.2 Initial equipment Constant humidity meter (technical conditions see Table [1]), 10.2. Constant humidity meter model If the bridge is reversed, the water type belt will be extended to 20-200°C. Reading single signal.
1. As a stopwatch with the minimum scale value of any two points not exceeding 0.1s, a megohmmeter with a rated voltage of 500V,
2. As a horizontal island slurry high-voltage test bench, the pressure is less than 14V, the power is less than 10.25kw: electronic AC instrument.
Exit conditions
The specified environmental conditions are (20=2), humidity and humidity are 651535(t)
Lurair:
The voltage generated by the power supply is not more than the rated voltage! %, and the frequency change does not exceed the rated voltage. In addition, there is no external field around the instrument. IV. Verification items and verification methods
12 Appearance inspection
The appearance of the inspection is checked by H measurement, and it meets the requirements of Article 1, 1-.1.3. 12.1
The appearance of the inspected device shall be checked by self-test method and shall meet the requirements of Articles 1 and 4. 12.3 Inspection of the display function of the inspection instrument
Approach the power supply of the inspection instrument and check whether all parts are functional. Press the short button to operate the instrument. If it has the corresponding function under the specified state, place the sensor in the tray and let the temperature rise gradually within the measurement range of the inspected instrument (about 2.5 degrees per minute, even if the inspected instrument rises in the counting unit), and observe whether the display of the inspection instrument changes continuously. Its display and reading structure meet the technical requirements of Article 1.5. This item can be selected as a single-point assessment on any channel
The printed record structure of the inspection instrument should be complete, and there should be no printing errors, omissions or unclear printing. 12.4
Polarity and sign check
Insert the sensor of the inspection instrument directly from room temperature into the medium below the temperature. You can clearly see the value displayed on the inspection display when the room temperature changes to the negative temperature value and displays the corresponding temperature value. Insert the sensor into the constant [limit. The inspection instrument should clearly display the over-limit symbol and the corresponding over-limit. When a channel sensor is disconnected, the inspection device should issue an alarm signal. This item can be checked at any single point in all channels, and the basic error of the indication can be verified at the same time
14 Verification of the value-replacing error
14. "Preheating: Pre-adjust
Connect the instrument power supply, preheat for 30 seconds, and for the test instrument with zero point (or lower limit) and adjustable range, adjust the required points (preferably the lower limit value) and range of the channel according to the requirements of the instruction manual before inputting the value, so that the limit error is as small as possible: No adjustment shall be made during the verification process:
14.2 Setting temperature points
Avoid the calibration points of the instrument for the inherent error should be sequentially distributed on the seven graduation points of the entire measuring range, also above the zero point 1054
, including the lower limit, and no less than 5 points. In special circumstances, the calibration points can be selected according to the user's requirements, but there shall be no less than 3 calibration points. 14.3 Calibration frequency
First calibrate the zero point, and then calibrate towards the upper limit value or the lower limit value: [4.4 Determination of the changing point
Break the ice into a state of being in a fixed state and put it into the above-mentioned situation, such as water suitable for it. It can be used after it stabilizes. Use a second-class standard silver thermometer to calibrate the instrument. Put the sensor of the test instrument directly into the freezing point phase. After the indication is stable, let all channels be inspected for 2 cycles at the same time, and record or print all the indications of the 2 cycles at the same time. The maximum value of the average value of each channel that deviates from the actual temperature of the freezing point is used to determine the basic error of the zero point indication. It is recommended to comply with the technical requirements of Article 3, 3.1 or 3.2.
Calibration of other groups of test points
Place the test sample in a glass test tube, and the inner diameter of the tube should be consistent with the test instrument diameter and width. During calibration, place the bag containing the test sample into the medium, and the pushing depth should not be less than 3mm1. In order to eliminate the convection of air and medium inside and outside the test tube, the outlet should be tightly plugged with a regular plug. Set the constant temperature to the test point L, and the temperature deviation from the test point should not exceed 0.2: (the minimum value of the second-class standard water thermometer is 0.1). After the displayed value of the test instrument stabilizes (after 20m), start reading. The reading sequence is as follows:
Standard test-tested →·tested, standard
Standard-tested, obtain...-tested, standard reading, let the test instrument perform 2 cycles of repeated testing on all channels (that is, measure the displayed value of each channel for not less than 2 changes), and record or print The temperature change value displayed on each channel is obtained by taking the average of two readings to obtain the initial reading value and the point reading value of the standard mercury thermometer (respectively expressed in , ) and the indication value of the instrument under test (represented in , ), and taking the value with the largest difference between each channel and the actual value to determine the basic error of the indication value of the calibration point. The interval between the two readings should be greater than or equal to the same period of the instrument under test. During the reading process, the temperature should be constant or slow, evenly distributed, and the change during the entire reading process should not exceed 0.2t:. Use the same method Then adjust the other calibration points in turn. Use water to calibrate, no need to use test tubes, fix the sensor and directly screw it into the test chamber for calibration, the insertion depth should not be less than 300mm
15min. For equal force calibration
, you can choose any channel for fixed single point test. The calibration can be carried out near any calibration point except zero point within the measuring range. During the calibration, the temperature is required to maintain a short and slow rising trend within 5m, and then observe the display value, so that it can be adjusted from one point to another. The starting point is when the new value is converted from one degree to another. Read the indication of the standard thermometer and record it as: When the minimum value of the instrument continues to be - degree value, read the first minimum value of the standard mercury thermometer and record it as 2. Repeat this process 3 times. The single resolution value received is: dt..
or: 2 - times 1, 2, 3 respectively. The average value of the 3 times is taken as the actual resolution value for inspection:
The resolution error is expressed by the following formula:
Af =dde
Where: d is the value of the inspection position [Jiang =] 1065
16 requires the inspection period
The inspection period of the dust detector can be selected at any temperature within the range of the measurement range. When the inspection instrument is in the normal inspection state, when the channel number and the source value of the cabinet are displayed, the stopwatch is started at the same time, and the temperature corresponding to the last channel number change is counted. The test is measured 3 times, and the average signal of the 3 measurements is taken as the inspection period of the inspection instrument. 17 qualitative determination
.1 recorded value of the determined indication
Technical Communication According to the specifications, the sensor of the tester shall be inserted into the ice point, and the fluctuation of the original indication value shall be calculated according to the counting unit (or minus the indication value). No interval counting jump is allowed. The maximum fluctuation of the displayed value shall be taken. It shall meet the technical requirements of 17.2 Short-term seasonal drift || tt || Short-term zero point remote inspection shall be carried out at the freezing point. After preheating, the display value of the tester shall be taken, and the maximum value among the absolute values of all channels with 10.0 is taken as the zero point maximum shift value of 11. At the right time, and on all channels, the short-term zero point source shift can be calculated by the following formula:
ZfoT:fo.mw
Formula 10: The maximum short-term zero drift of the micro-inspection instrument (:t The short-term comprehensive display value of all channels of the inspected instrument within 1h, the maximum display value (T) 18 The insulation resistance of the insulation wire is measured with a megohmmeter with a fixed voltage of 500V. When measuring, cut off the external power supply, make all seven power switches in the pass position, use wires to connect the measurement terminals respectively, and then install the equipment specified in Article 7 for quality assurance. The connection should meet the technical requirements of this article. 19 The insulation resistance of the insulation wire is measured by
with a megohmmeter with a fixed voltage of 500V. When measuring, cut off the external power supply, make all seven power switches in the pass position, use wires to connect the measurement terminals separately, and then install the equipment specified in Article 7 for quality assurance. The connection should meet the technical requirements of this article. 19 The insulation resistance of the insulation wire is measured by ||tt ||The test instrument is continuously driven for testing. A 45-65H sine wave is used. The test position and test voltage are carried out according to Article 8: During the test, the power switch of the test instrument is in the terminal position. The terminals are short-circuited with copper wires. First, the no-load voltage of the high-voltage test platform is set to the specified test voltage, and then the test voltage is made to rise steadily from zero to the specified value and maintained for 1mn. No flashover occurs, and no sparks are generated. Finally, the test voltage is made to drop steadily to zero and the power supply is cut off.
5. Processing of test results
20. Calculation of actual temperature and minimum value H. 20. The actual temperature of warm water and tank is calculated using the following formula: -tn I x
Wherein: - Actual moisture content (t):
Product -, third-class standard silver temperature to be calculated the average signal of the starting number of the two test cycles (t'); third-class standard silver temperature to be calculated the positive value of the virtual value (it
first-class standard water compensation thermometer after each use (the specification is continuous, the period can be determined every time: when the zero point position changes, the following formula should be used to calculate the new indication correction value of each point: new = the proven positive! (the original book on the share of virtual military point set after the new measured working limit temperature 55
these fixed zero point position! ||t t|| Readings are allowed to be made. Due to temperature changes, the indications of each channel of the test instrument should be adjusted. The calculation formula is as follows: 4
In the formula: minus the correction value caused by the temperature change (); the average number of trials of the starting points of the two tests at the same standard mercury temperature can be used to estimate the average of the end readings of the two test cycles (. Total number of channels:
Carbon dioxide detection channel,
standard 4, less than the allowable difference of the test instrument under test, then the error calculation formula for the false indication is as follows: 20.3
Dr, t.I Are
Where: 2-The total error of a certain channel under inspection at a certain calibration point is (): +, ...-The total error of a certain channel under inspection during two inspection cycles is [\] 21. If the number of channels under inspection does not meet the requirements of this regulation, a certification certificate will be issued; if the channel rate meets the requirements of Table 2, a calibration station will be issued for use. It is necessary to note that the channel under inspection does not meet the requirements of Table 2, and the single machine is unqualified. The calibration result is shown in the table.
The calibration cycle of the inspection can be determined based on its actual situation, and the longest shall not exceed "years. The temperature inspection record format is:
Standard pollution plan ||tt ||Stop chasing
Small wire ()
Make structure theft identification
Long receive selection instrument to show evil (t)
Yin Jingguan surface
Min Quan Du Fu service channel to show life ()
Standard reputation plan
Ha'an point
Coordinate the city
Control bottom point
Standard arrangement sea plan
Degree inspection and design to show the situation (death!||tt| |Chain average inspection value loss difference (7
Horizontal position
Prohibited time
Exempt sequence selection instrument indication difference (t)
Respectful effect of complete communication and digestion t:!
Appendix 2
Temperature compliance inspection instrument calibration record example
Medium 1 number
Measurement range -40-·100t
Cooling rate = period 1950.6, [0)
Study set makeup
Standard product actual
Average upper room
Change you invite age you
Display consultation)
Average clinical
Standard stop value
Yi/study control store
East position error ()
Danger return goods collection full return road display position ()
- 29 8
- 30 6
0.141 0.03
card standard learning let
small (t:)
average still
equal position
still benefit meter
age inspection has
almost and with him
calm heart edge
already inspection area fast
model joyful approaching danger document preparation through tracking life
this elimination source meter
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