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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 КРЕШ 432210.001 ТУ.

Periodical tests include:

1. Strength tests under sinusoidal vibration (GOST 20.57.406 method 103-1.1 with degree of rigidity - IV);
2. Strength tests under single mechanical shocks (GOST 20.57.406 method 106-1 with a degree of rigidity - IV);
3. Transportation  tests (GOST 15150);
4. Exposure to high humidity in accordance with GOST 20.57.406, method 207-2;
5. Testing the strength to the effects of changes in ambient temperature in accordance with GOST 20.57.406 method 106-1 with a degree of rigidity - IV;
6. Testing the strength to the effects of cycles "on - off";
7. 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°С/+100°С with current polarity reversal, not less than 10³ cycles)
2. Temperature cycling (test +40°С/+90°С with current polarity reversal, not less than 2х10⁴ cycles for standard TEC and 10⁵ cycles for the TEC to be operated under thermocycling conditions)
3. High temperature storage (+85°С)
4. Low temperature storage (-40°С)
5. Cyclic variation of ambient temperature 
6. Storage at high humidity – for sealed coolers (+85°C, 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°С), 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.