5. 1 packaging A. Thermocouples generally adopt simple packaging specified in ZBY 003-85 "Technical Conditions for Packaging of Instruments and Meters". B thermocouples with ceramic protective tubes and other fragile and easily damaged thermocouples shall be packed in shock-proof packages specified in ZBY 003.
5.2 Information to be indicated on the nameplate or factory certificate A. Model; B. specifications; C. code number (division number); D. applicable temperature range; E. tolerance level; F. protective tube materials; G. the name of the trademark or manufacturer; Date of production.
5.3 Information to be provided in the manual A. Graduation table; B. thermal response time; C. applicable environment; D. general methods of use; Special technical conditions.
Annex A Additional Type Test (Supplementary)
A. 1 technical requirements
A. 1. 1 Insulation resistance thermocouple under wet and hot conditions At the end of the test under constant wet and hot conditions, its insulation resistance value shall not be less than10mΩ.
A. 1.2 At the end of the unpacked free-fall test, the unpacked free-fall thermocouple shall be free from mechanical damage, open circuit or short circuit, and the insulation resistance at room temperature shall meet the requirements of 2.3. 1.
A. 1.3 At the end of the vibration test, the vibrating thermocouple shall be free from mechanical damage, open circuit or short circuit, and the insulation resistance at room temperature shall meet the requirements of 2.3. 1.
A. 1.4 pressure thermocouple shall have no leakage, mechanical damage, open circuit or short circuit under the test pressure, and the insulation resistance at room temperature shall comply with the provisions in 2.3. 1.
A. 1.5 liquid intrusion protection thermocouple: at the end of the liquid intrusion protection test, there should be no mechanical damage, no open circuit or short circuit, no visible water mark in the junction box, and the insulation resistance at room temperature should meet the requirements of 2.3. 1
A. 1.6 flameproof thermocouple shall be flameproof tested by an institution designated by the state, which shall issue a certificate according to the national regulations.
A.2 test methods
A.2. 1 Insulation resistance under wet and hot conditions shall be tested in accordance with GB2423.3—8 1 Basic environmental test procedures for electrical and electronic products Test Ca: Constant wet and hot test method. The experiment lasted for 2 days. Immediately after the test, measure the insulation resistance of the thermocouple under test at room temperature according to Article 3.3.
A.2.2 Before the unpackaged free-fall test, the thermocouple to be tested shall have a complete structure. The test device is a steel plate with a thickness of 6mm, which is laid on the hard ground. During the test, the longitudinal axis of the thermocouple to be measured is basically parallel to the surface of the steel plate, and the distance between them is about 250 mm, and then the thermocouple is allowed to fall freely to the steel plate from this height. This process will be repeated ten times. Immediately after the test, check whether the thermocouple under test has mechanical damage, open circuit or short circuit, and measure the insulation resistance at room temperature according to Article 3.3.
A.2.3 Vibration shall be tested according to GB445 1-84 vibration (sine) test method for industrial automation instruments. According to the actual situation, the vibration level can be 2B or 2C. Immediately after the test, check whether the thermocouple under test has mechanical damage. Whether there is an open circuit or a short circuit, and measure the insulation resistance at room temperature according to Article 3.3.
A.2.4 Pressure Place the thermocouple to be tested in a pressure test tube filled with liquid, and gradually increase the pressure to 1.5 times of the maximum service pressure, and keep it for 60 seconds. Immediately after the test, check whether the thermocouple under test has leakage, mechanical damage, open circuit or short circuit, and measure the insulation resistance at room temperature according to Article 3.3.
A.2.5 According to the actual situation, one of the three grades (increasing in severity) mentioned in A.2.5. 1, A.2.5.2 and A.2.5.3 can be selected for the test. Immediately after the test, check whether the thermocouple under test has mechanical damage, open circuit or short circuit, and whether there is visible water mark in the junction box, and measure the insulation resistance at room temperature according to Article 3.3. A.2.5. 1 See Figure A for the principle of the test device. This device should have a semicircular water spray pipe, which can swing back and forth, and the radius of the semicircle should be as small as possible to meet the actual needs. The swing angle α of the spray pipe relative to the vertical direction is 60, and the half angle β of the fan-shaped spray surface is 60. It takes about 65438 0 seconds to sweep the α angle, and the test pressure is 0.65438±0 MPa. The longitudinal axis of the thermocouple to be measured is basically perpendicular to the ground, and its junction box is roughly in the center of the semicircular sprinkler pipe. During the water spray test, the thermocouple to be tested rotates around its axis180 every 300 seconds, and the water spray test time is at least 10 minute. This picture is an inverted picture.
A.2.5.2 The principle and test method of the test device are the same as those in A.2.5. 1. But α is about 180, β is about 90, and it takes about 0.5 seconds to sweep the α angle.
A.2.5.3 The test device is a water nozzle with an inner diameter of 12.5mm, the test pressure is 0. 1MPa, and the distance from the water nozzle to the junction box of the tested thermocouple is 3m. When testing, the water nozzle should spray water from all directions to the thermocouple to be tested. The water spray test time shall be at least 15 minutes.
A.2.6 The flame-proof test shall be carried out in accordance with GB 3836-83 "D" on flame-proof electrical equipment.
Appendix b supplementary explanation (reference)
B. 1 conversion method If the deviation between the actual inspection temperature and the inspection temperature point is small, the conversion surface of the thermoelectric potential measurement result can correspond to the thermoelectric potential value of the inspection temperature point in the following way. E (t) = e (t')+(t-t')-(3) where: t- inspection temperature,℃; t & amp； Shy; —— Actual inspection temperature measured by standard thermometer,℃; E (t)-thermoelectric heat of thermocouple at temperature t, μ v; E (t') —— thermoelectric heat of thermocouple at t', μ v; -Sensitivity or Seebeck coefficient of thermocouple at temperature t, μ v℃- 1. It can be calculated according to the formula given in the appendix of ZBY300, or from the following formula =-(4): e *(t)- When the temperature is t, an example of thermocouple graduation is given: the thermoelectromotive force measured by K-type thermocouple is 4 1.400mV, and the inspection temperature is 1000℃. The actual inspection temperature measured by standard thermometer is 1005.5℃. MV/℃
B.2 Other main standards related to this standard
B.2. 1 hot electrode a. GB3772-83 platinum rhodium 10- platinum thermocouple wire and graduation table; B. GB2909-82 platinum rhodium 30- platinum rhodium 6 thermocouple wire and graduation table; C. GB4994-85 iron-copper-nickel thermocouple wire and graduation table; D. GB2903-82 Copper-constantan thermocouple wire and graduation table; E. GB4993-85 "Ni-Cr-Cu-Ni thermocouple wire and graduation table"; F gb2614-85 ni-Cr-ni-si thermocouple wire and graduation table;
B.2.2 compensation conductor GB4989-85 thermocouple compensation conductor.
B.2.3 Ceramic protective tube and insulating tube GB2935-82 thermocouple porcelain sleeve.
Common product categories: industrial thermocouple assembly thermocouple explosion-proof thermocouple armored thermocouple micro-armored thermocouple wear-resistant thermocouple multipoint thermocouple blowing thermocouple pressure spring fixed thermocouple multipoint explosion-proof thermocouple high temperature and high pressure thermocouple furnace edge thermocouple right angle elbow thermocouple cracking furnace special thermocouple fast thermocouple/temperature measuring gun high temperature precious metal thermocouple wear-resistant cut-off thermocouple wear-resistant leak-proof thermocouple.