{"id":4515,"date":"2025-08-06T15:57:40","date_gmt":"2025-08-06T13:57:40","guid":{"rendered":"https:\/\/www.drwiesner.de\/glossary\/effect-of-temperature\/"},"modified":"2025-11-04T13:55:40","modified_gmt":"2025-11-04T12:55:40","slug":"effect-of-temperature","status":"publish","type":"glossary","link":"https:\/\/www.drwiesner.de\/en\/glossary\/effect-of-temperature\/","title":{"rendered":"Effect of Temperature"},"content":{"rendered":"
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In leak testing using pressure-measuring methods, the temperature of the air test medium has a significant influence on the measurement result. This is essentially influenced by the temperature of the test specimen and the ambient temperature, in addition to the temperature of the air preparation.<\/p>

The test procedure usually consists of 4 phases: Filling, Stabilization, Testing, and Emptying. The temperature change during the test phase, i.e., the period in which the pressure change is measured and evaluated, is crucial.<\/p>

If the temperature of the air in the test specimen rises during the test phase, e.g., due to a warm test specimen, the pressure increases. A pressure reduction caused by a leak can, under certain circumstances, be compensated for, which could lead to a leaky part being evaluated as "tight."<\/p>

If the temperature of the air in the test specimen drops during the test phase, e.g., due to cold drafts, the pressure decreases. A pressure reduction due to a leak can thus be so greatly amplified that an actually tight part is evaluated as "leaky."<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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The extent of temperature’s influence on the measurement result will be illustrated using the following test parameters as an example.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t

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Test Pressure:<\/p><\/td>

p = 2000 mbar abs. (corresponds to 1000 mbar gauge pressure)<\/p><\/td><\/tr>

Test Specimen Volume:<\/p><\/td>

V = 110 cm³<\/p><\/td><\/tr>

Permissible Leak Rate:<\/p><\/td>

Q = 0.5 cm³\/min<\/p><\/td><\/tr>

Test Time:<\/p><\/td>

5 sec<\/p><\/td><\/tr>

Test Air Temperature:<\/p><\/td>

t = 23°C<\/p><\/td><\/tr><\/tbody><\/table>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t

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The pressure change ∆pL<\/sub> due to a leak is approximately calculated using the following formula:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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In our example:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

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for a test time of 5 sec:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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The pressure change ∆pT<\/sub> due to a temperature change is approximately calculated using the following formula:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
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Accordingly, in our example, a temperature increase of 0.1°C during the 5 sec test time yields the following calculation:<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t

\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\"\"\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t
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Result:<\/strong><\/p>

In our example, the test pressure would increase by 0.3 mbar, even though a leak of 0.5 cm³\/min is present.<\/p>

This effect is usually counteracted by a preceding stabilization phase. The stabilization time must be chosen such that temperature equalization between the test specimen and the test air is achieved. In this way, a temperature change during the subsequent test phase can be kept very low. Furthermore, the test time itself can be extended to achieve a larger pressure drop.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t

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In leak testing using pressure-measuring methods, the temperature of the air test medium has a significant influence on the measurement result. This is essentially influenced by the temperature of the test specimen and the ambient temperature, in addition to the temperature of the air preparation. 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