Development and production of thermoelectric modules
               
 
home email
 




Description of tests


 

The tests are classified as:

1

Acceptance

2

Periodic

3

Reliability

4

Standardized


   Acceptance tests are aimed at control of the conformity of coolers to KRYOTHERM standards and customer's specifications. 100% of the coolers produced are subjected to this test. 


Acceptance tests include:

1.

Control of geometrical dimensions

2.

Control of electrical and physical unit parameters: resistance and figure of merit

3.

Visual inspection

4.

Check for compliance with the customer's specifications

 

   Periodical tests are aimed at control of the technological processes used for TEC manufacturing.
Periodical tests are performed on 2-3 types of coolers at least once a 1/2 year. Two coolers of each type that have passed the acceptance tests in full volume are subjected to this test.
 

   In the case the existing technological processes are modified or new processes are introduced, unscheduled periodical tests of the products manufactured by using the new or modified technology are carried out. Periodical tests conform to the requirements of MIL-STD-883 and GOST 20.57.406, 20.57.406-81, 15150.

 


Periodical tests include:

1. Strength tests under sinusoidal vibration (MIL-STD-883, method 2002)
2. Strength tests under single mechanical shocks (MIL-STD-883, method 2007)
3. Shear strength tests (MIL-STD-883, method 2019)
4. Transportation  tests (GOST 15150)
5. Effect of elevated humidity - for sealed coolers (=+27C, relative humidity is 100%)
6. Cyclic variation of ambient temperature  (MIL-STD-883, method 1010)
6. Life-time tests (1000 h, I=0.75Imax, Th=27+/-10C)
7. Temperature cycling (test +40/+90 with change of current polarity, not less than 104 cycles)
8. Control of insulation resistance of TEC
 

  
 Reliability tests are performed for the TECs on which more strict requirements to operational reliability are specified.

Reliability tests include:

1. Strict temperature cycling (test 0/+100 with current polarity reversal, not less than 103 cycles)
2. Temperature cycling (test +40/+90 with current polarity reversal, not less than 2104 cycles for standard TEC and 105 cycles for the TEC to be operated under thermocycling conditions)
3. High temperature storage (+85)
4. Low temperature storage (-40)
5. Cyclic variation of ambient temperature (MIL-STD-883, method 1010)
6. Storage at high humidity - for sealed coolers (+85C, relative humidity 100%)


     Standardized tests are aimed at estimation of the effectiveness and advisability of introducing changes in the methods of TECs production and the using new materials and components. The content of tests is determined by the type of supposed changes.

   All inspections and tests of TECs, unless otherwise specified, are conducted under normal climatic conditions: air temperature - (25+10), relative humidity of air - 45-80%, atmospheric pressure - 84-106.7 kPa (630-800 mmHg)
Additional tests can be performed at a special customer's request. The content and parameters of these tests are agreed with the customer and depend on the anticipated TEC application.
 

 

 

 

 


  


 
 
 

© 2007 "Kryotherm". 197348, Russia, Saint-Petersburg, Aerodromnaya st. 6