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Thermostat performance testing standards

Article Source:Thermostat factoryAuthor:Yaxun ElectronicsPopularity:Published time:2017-03-10 14:35

Thermostat performance testing standards
Yaxun electronic production thermostat for 15 years,Product quality has been recognized by customers,Because my company has a set of strict product testing standards,Product qualification rate of 99.9%.In order to allow customers to understand our company's products rigorous testing standards,I provide a detailed product testing process,For customer analysis reference.
1.2 Structural requirements
1.2.1 appearance
     Visual inspection of metal parts,There is no crack and coating off the phenomenon,Insulation material shall not be cracked,Product logo should be clear.

1.2.2 Lead wire tensile test
     The static force is applied to the lead wire along the axial direction to 20N,Keep 1min, after the end of the test temperature switch leads should be no separation, loose and no significant damage.

1.2.3 Test of glowing wire for insulating parts
      Insulation pieces glow wire test according to GB5169.4 test,The test temperature at the top of the glow wire was 850 ° C ± 10 ° C,The duration of the test was 30 s ± 1 s.

1.3 Performance requirements
1.3.1 Rated breaking temperature test
      The temperature switch placed in the oven for testing,The air flow rate of the test chamber is not less than 200 m / min.
      Measurement method using thermocouple or thermometer,The temperature sensor or thermometer should be placed on the temperature switch sample,Or as close as possible to the temperature switch.

    Increase the air temperature in the test,The temperature change rate when the air temperature is lower than the rated breaking temperature lower limit temperature 10K does not exceed 0.5K / min,To the temperature switch action,The measured temperature shall comply with the requirements of 6.4.1.
    Use the indicator light or other means to indicate the on-off state.The current through the temperature switch does not exceed 0.01A
1.3.2 Reset temperature test
      Use the method specified in 1.3.1 to perform the reset temperature test,Reduce air temperature,The temperature change rate when the temperature is about 10K higher than the upper limit of the reset temperature is not more than 0.5K / min,When the temperature switch is reset,The measured temperature shall comply with the provisions of 1.4.2.

1.3.3 Critical trip current test
     The temperature switch is placed in the temperature field accuracy of ± 2 ℃ relatively static air for testing.

   In the trial,Let the ambient temperature remain at any temperature below the rated off temperature,And pass the temperature of the temperature switch off the critical trip current for 1h, should be consistent with the provisions of 1.4.3.
1.3.4 Rated trip current test
      The temperature switch placed in a relatively static air,Its ambient temperature is maintained at 25 ℃ ± 2 ℃ or less,And through the rated trip current,Measure the time from the connection to the trip,Shall comply with the provisions of 1.4.4.

1.3.5 contact resistance test
     The contact resistance between the two lead lines is measured by micro-Shall comply with the provisions of 1.4.5.

1.3.6 Insulation resistance test
     The temperature switch placed above the rated breaking temperature of the upper limit temperature of 10K ambient temperature, To be broken after the contact,With 500V megger to detect the temperature switch between the following parts of the insulation resistance,Shall comply with the provisions of 1.4.6.
                  
    A. Between two leads;
   B. Between the lead wire and the housing insulation.

1.3.7 Electrical strength test
      Electrical strength performance test,Its test power capacity of not less than 0.5kVA,Frequency of 50Hz,Set the current 100mA,Test voltage (AC rms) is applied at the location described in 1.4.7.In the test,Starting from a half of the test voltage,Quickly rose to full value,Duration 1min should be no breakdown or flashover phenomenon.

    Note: (1) electrical strength between the two contacts test,Should be placed in the temperature switch is about higher than the rated temperature of the rated breaking temperature of 10K air medium,In the case of contact disconnection;
        (2) the electrical strength test between the lead wire and the outer surface of the insulating member is carried out at room temperature;
        (3) to improve the test voltage of 20%,Can reduce the pressure time is 1s.

1.3.8 Durability test
      Temperature switch access AC 50Hz,Rated voltage 250V,Power factor COSΦ of 0.75 ~ 0.8 in the circuit,Pass to rated current,The current tolerance of ± 5% of the circuit,Operating frequency (connected - breaking - on time) is not less than 13min,The test cycle rate depends on controlling the ambient air temperature,After this cycle 4000 times,Shall comply with the provisions of 1.4.8,And then continue to test 4000 times,Shall comply with the provisions of 1.4.8.

1.3.9 Limit short circuit performance test
The temperature switch and 15A fast fuse in series,With a skim bobbin wrapped around the temperature switch,Access to the expected current specified in Table 1, the power factor COSΦ 0.9 ~ 1.0 in the circuit,During the test, the temperature switch is allowed to repeat the action,The test shall be carried out until the temperature switch is permanently open from the circuit or fuse blown,Allows the temperature switch contacts to be welded or broken.Shall comply with the provisions of 1.4.9.

1.3.10 Damp heat performance test
    In this experiment, Ca test method,The requirements of the test chamber, see GB2423.3 Chapter 2 test conditions,Tested in accordance with the stringent level specified in 6.4.10 and 2.3 in GB2423.3.

   On the test product testing,The electrical strength test of the lead wire and the insulating outer surface was carried out within 30 minutes after the end of the condition test.At this time for the normal atmospheric pressure conditions,And to avoid the presence of condensation on the test sample.
   In 1h ~ 2h and then placed in the test sample is higher than the rated breaking temperature of the upper limit temperature of 10K, and the contact is broken,First with 500V megger measured insulation resistance,And then the electrical strength test,Its test voltage dropped to 80% of the original.The results shall be in accordance with the provisions of 1.4.10.
1.3.11 high temperature performance test
   The temperature switch into the test chamber temperature rose to 150 ℃,And hold for 96h, remove the air cooled,1h after the action performance test,Shall comply with the provisions of 1.4.11.

1.3.12 Low temperature performance test
    The temperature switch into the test chamber temperature down to -40 ℃,And keep out after 16h,At room temperature for 1h to maintain the performance test,Shall comply with the provisions of 1.4.12.

1.3.13 Vibration performance test
    The temperature switch fixed on the test bench,Respectively, in the direction of X.Y.Z vibration,In each position for the amplitude of 0.35mm,Vibration frequency 50Hz lasted 90min,After the vibration test, the rated breaking temperature,Shall comply with the provisions of 1.4.13.

Thermostat performance test standard
Technical guide:  〈bimetal technical parameters and product development