Some standard content:
Verification regulations for electric temperature transmitters
JJ(:829—1993
Electric temperature transmitters
Verification regulations
Ferincatlon Regulation or
'Temperature Electrical TransmitterJJGA29—1993
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The vehicle inspection and certification is now approved by the National Technical Supervision Bureau in June 1993 and will be implemented from December 1, 1993. Responsible unit: Shanghai Technical Supervision Bureau
Drafting unit: Nanning Testing Technology Research Institute The technical documents of this regulation shall be interpreted by the main drafters of this regulation:
Ling Shouyuan (Hunan Testing Technology Research Institute) Liu Lansong (Chaonan Testing Technology Research Institute) Participating drafters:
Zhan Xiaoxie (China Industrial Testing Center)
Liu Dan (Dajin Testing Technology Research Institute)
Niu Xiaoshuo (Tianjin Metrology Institute)
Yang Tali (Dianqing Testing Technology Research Institute)
Cha Ming (Chongqing Testing Technology Research Institute) Municipal Institute of Metrology and Technology
Technical requirements·
Verification conditions.
Verification items...
Verification methods
Verification results and verification period
Verification wiring
Verification procedures for electric temperature transmitters
This procedure is applicable to the verification of electric temperature transmitters that are new, in use and under repair, as well as other electric temperature transmitters (hereinafter referred to as transmitters) with a standard current of 0-10mA or 4-20mA:1A. The transmitter is used in conjunction with thermocouples and resistors to convert temperature signals or current signals into a uniform current signal of 1-5V (0mA-4.20mA) for transmission. The vertical block diagram is as follows: Thermoelectric code
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Fang Hui's birth certificate The transmitter is distinguished by load resistance, load resistance 1.5k0 (such as DDZ-Ⅱ series), load resistance 0-50 four-wire or 250-350 one-wire (such as PPZ series), load resistance 250-3500 or 0.600 (D2S series). Technical requirements 1. Appearance 1.1 The shell and surface of the transmitter, panel and brand should be clean. The transmitter in use should not have serious defects such as shedding and damage that affect the performance of the instrument. 1. The brand mark shall include the name or factory mark, transmitter name, model, number, year and month of manufacture, type of transmitter, measurement range, accuracy grade and number of the sensor used. 1.3 The wiring board should have a connection Line mark,
1.4 The terminal firmware shall not have an abnormality, and the movable parts shall be controlled. 2 The basic error of the transmitter shall not exceed the provisions of the table 1 (1% of the output range) (1) The accuracy of the transmitter shall not exceed the maximum value of the range (normal resistance), 2) The error caused by the small package chicken code special supply, 3 The return error of the transmitter shall not exceed the standard of 2, 2 The standard has the worst average loss of 3%). When the load resistance changes within its full range, the change of the transmitter output lower limit of the range shall not exceed the value of the allowable error.
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When the power supply voltage abandons the table? The specified power supply voltage, the six changes in the value of the fixed, the transmitter program lower limit value does not show the change of the room can not pass the absolute value of the allowable error, 6 input mountain AC basic
6.1 For the load resistance of .-1.5k transmitter input has been AC value with effective signal not exceeding 20rrV, electric voltage:
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Note, for IDZ-S transformer source voltage change 1.2 For four-wire transmitters with a load output resistance of 1~500Ω, the effective value of the AC component of the total output voltage should not exceed 1% of the temporary output range. 2.3 For two-wire transmitters with a load current limit of 21-351Ω, the AC component of the temporary output voltage should not exceed 150mV and the effective value should not exceed 150mV. The insulation resistance value of the transmitter should not be less than the specified value in Table 4. The insulation strength of the transmitter should be able to withstand a frequency of 5Hz and an effective value that meets the test voltage specified in Table 5. It is generally recommended to use 1m4 for the test. The test time is 1mi without any arcing. Table 4
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The standard instruments and equipment required for calibration should be shown in Table 6.10 Calibration environmental conditions and 5 piece conditions
10.1 Environmental virtuality: (20+5) [0.2 level is interpreted as (20+2)], mud degree; 45%-75%. Except Outside the field, there should be no other external magnetic field, light vibration, and light erosion around that affect the transmitter. 0.2
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according to the relevant provisions of the transmitter instruction manual,
: the verification items of the transmitter are shown in the table?
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Five verification methods
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Perform inspection according to the requirements of 1.1 to 1.4 in Article 1 of this regulation. 14 To the verification of the error
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14.1 The verification connection of the transmitter's error shall be carried out according to the corresponding connection in the appendix. Hengshan Yi
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14.2 Before the transmitter is calibrated, it should be preheated according to the time specified by the manufacturer. If the manufacturer does not specify, it is allowed to preheat for 15 minutes.
14.3 Zero adjustment process
For transmitters with zero adjustment and range adjustment potentiometers, it is allowed to adjust after preheating, but no adjustment is allowed during the calibration process.
14.4 Selection of calibration points
The calibration points should include the upper and lower limit values (within 10% of the range) and at least 5 points. The calibration points should be evenly distributed in the entire measurement range:
14.5 Calibration method
Receive the auxiliary signal increase (upward stroke) and decrease (downward stroke) in the direction, and send the corresponding electrical value of each calibration point to the transmitter to read the actual output value of the transmitter: for the upper limit value, only the upper stroke is checked; for the lower limit value, only the lower stroke is checked. Use the sample to repeat the calibration again, and find the maximum error. When the thermoelectric transmitter is calibrated with the compensation line, the input of the transmitter is added with the static value of the compensation line.
Under no doubt, only one cycle of calibration can be performed. 14.0 Transmitter upper and lower stroke basic error calculation formula (1): -4-4
×100%
-Transmitter one, lower stroke basic error (%): 777
A, the actual input value corresponding to the customer inspection point in the upper and lower stroke (m or V!): 4-the nominal output value corresponding to each inspection point (mA or V): S-transmitter input code (mA or V)
15 called process difference verification
The verification of the transmitter national model design difference and the basic error are carried out at the same time. And calculated according to formula (2): 4, -1 8: -: 1
Transmitter error (%):
,6 transmitter, the average error is [%) 10 load change detection case
16.1 For a transmitter with a load resistance of 0-1.5k, set the load resistor to 1.5k52. Make the outputs to the lower limit and upper limit respectively, then change the load resistance to zero and measure the current value. 16.2 For a four-wire transmitter with a load resistance of 0-500, set the load resistance to 5001, make the output signal at the voltage output end to the lower limit and upper limit respectively, then change the load resistance to equal, measure the detected voltage value, 16.3 For a two-wire transmitter with a load resistance of 250-3502, set the load resistance to 3502, make the outputs to the lower limit and upper limit respectively, then change the load resistance to 2, and measure the output current value. 15.4 Based on the above measurement results, calculate the change values of the input current and the output current. 1. For the transmitter with 220V AC power supply, adjust the power supply voltage to 220V, make the output of the transmitter to the lower limit value and the upper limit value, and then adjust the power supply voltage to the voltage change values specified in Table 3, and measure the input current value. 17.2 For the transmitter with 24V DC power supply, adjust the power supply voltage to 24V, make the output of the transmitter to the lower limit value and the upper limit value, and then adjust the voltage to the voltage change values specified in Table 3, and measure the input current value. 17.3 Based on the above full measurement results, calculate the change values of the lower limit and the output current. 18 Input AC component verification
18.1 For a transmitter with a load resistance of 0 to 1.5k5, set the load resistance to 2002, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 5% and 90% of the range. 18.2 For a four-wire transmitter with a load resistance of U-501, adjust the input signal to make the output voltage change from 1V to 5V, and use an AC voltmeter to measure the output AC voltage. 18.3 For a two-wire transmitter with a load resistance of 250.-3500, set the load resistance to 2502, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 50% and 0% of the range. 19 Insulation resistance test
Disconnect the power supply of the transmitter, and use a 500V insulation resistance meter to measure the parts specified in Table 4 of Article 8 of this standard.
20 Insulation test
Disconnect the power supply of the transmitter, and connect the two terminals of the pressure tester in turn according to the provisions of Article 8 and 5 of the standard. Steady the voltage to the specified value, and hold for 1mn to check whether there is breakdown and flying phenomenon. 6. Processing and verification of verification results 21. For transmitters that have passed the verification, a verification certificate will be issued. For transmitters that have failed the verification, a verification result report will be issued. The verification result report will include the date of the failed item and the verification result. 22. For transmitters that have failed the verification, the test and stability of the transmitter have not been determined. -- For years, Appendix 1 specifies the wiring circuit, direct current limit, standard resistance, adjustable voltage, maximum voltage, pure voltage, white period, please stop at four levels, cross voltage, and increase voltage period. [0.01-0.01]. Average voltage transmitter verification line to air protection number, self-limiting protection, commercial power supply, and blood ratio, symptoms, and pressure department. 2. Negative voltage The resistance is 0-1. The potential resistance transmitter pulls the wiring 779
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Figure 7 Thermoelectric room air transmission storage belt reference degree test wiring diagram4 Based on the above measurement results, calculate the change values of the input current and the output current. 17.2 For a 24V DC powered transmitter, adjust the power supply voltage to 24V, make the transmitter output the lower limit value and the upper limit value, respectively, and then adjust the voltage to the voltage change values specified in Table 3, and measure the input current value. 17.3 Based on the above full measurement results, calculate the change values of the lower limit and the output current. 18 Input AC component verification
18.1 For a transmitter with a load resistance of 0 to 1.5k5, set the load resistance to 2002, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 5% and 90% of the range. 18.2 For a four-wire transmitter with a load resistance of U-501, adjust the input signal to make the output voltage change from 1V to 5V, and use an AC voltmeter to measure the output AC voltage. 18.3 For a two-wire transmitter with a load resistance of 250.-3500, set the load resistance to 2502, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 50% and 0% of the range. 19 Insulation resistance test
Disconnect the power supply of the transmitter, and use a 500V insulation resistance meter to measure the parts specified in Table 4 of Article 8 of this standard.
20 Insulation test
Disconnect the power supply of the transmitter, and connect the two terminals of the pressure tester in turn according to the provisions of Article 8 and 5 of the standard. Steady the voltage to the specified value, and hold for 1mn to check whether there is breakdown and flying phenomenon. 6. Processing and verification of verification results 21. For transmitters that have passed the verification, a verification certificate will be issued. For transmitters that have failed the verification, a verification result report will be issued. The verification result report will include the date of the failed item and the verification result. 22. For transmitters that have failed the verification, the test and stability of the transmitter have not been determined. -- For years, Appendix 1 specifies the wiring circuit, direct current limit, standard resistance, adjustable voltage, maximum voltage, pure voltage, white period, please stop at four levels, cross voltage, and increase voltage period. [0.01-0.01]. Average voltage transmitter verification line to air protection number, self-limiting protection, commercial power supply, and blood ratio, symptoms, and pressure department. 2. Negative voltage The resistance is 0-1. The potential resistance transmitter pulls the wiring 779
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Figure 7 Thermoelectric room air transmission storage belt reference degree test wiring diagram4 Based on the above measurement results, calculate the change values of the input current and the output current. 17.2 For a 24V DC powered transmitter, adjust the power supply voltage to 24V, make the transmitter output the lower limit value and the upper limit value, respectively, and then adjust the voltage to the voltage change values specified in Table 3, and measure the input current value. 17.3 Based on the above full measurement results, calculate the change values of the lower limit and the output current. 18 Input AC component verification
18.1 For a transmitter with a load resistance of 0 to 1.5k5, set the load resistance to 2002, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 5% and 90% of the range. 18.2 For a four-wire transmitter with a load resistance of U-501, adjust the input signal to make the output voltage change from 1V to 5V, and use an AC voltmeter to measure the output AC voltage. 18.3 For a two-wire transmitter with a load resistance of 250.-3500, set the load resistance to 2502, and use an AC voltmeter to measure the AC voltage across the load resistance when the input signal is set to 10%, 50% and 0% of the range. 19 Insulation resistance test
Disconnect the power supply of the transmitter, and use a 500V insulation resistance meter to measure the parts specified in Table 4 of Article 8 of this standard.
20 Insulation test
Disconnect the power supply of the transmitter, and connect the two terminals of the pressure tester in turn according to the provisions of Article 8 and 5 of the standard. Steady the voltage to the specified value, and hold for 1mn to check whether there is breakdown and flying phenomenon. 6. Processing and verification of verification results 21. For transmitters that have passed the verification, a verification certificate will be issued. For transmitters that have failed the verification, a verification result report will be issued. The verification result report will include the date of the failed item and the verification result. 22. For transmitters that have failed the verification, the test and stability of the transmitter have not been determined. -- For years, Appendix 1 specifies the wiring circuit, direct current limit, standard resistance, adjustable voltage, maximum voltage, pure voltage, white period, please stop at four levels, cross voltage, and increase voltage period. [0.01-0.01]. Average voltage transmitter verification line to air protection number, self-limiting protection, commercial power supply, and blood ratio, symptoms, and pressure department. 2. Negative voltage The resistance is 0-1. The potential resistance transmitter pulls the wiring 779
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Figure 3 The negative resistance is 0-501 Four-wire thermal electric stomach transmitter calibration wiring surface fixed base hospital ten
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Figure 5 The negative cut-off limit is 250-3507 Two-wire pharmaceutical monthly occasional transmitter vertical quantitative line diagram control variable
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Figure 7 Thermoelectric room air transmission storage belt reference degree test wiring diagram
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