Today, we're going to dive into the IEC 68-2-68 test method L, specifically focusing on the first procedure for fine dust testing. This test is designed to evaluate the resistance of equipment to the effects of fine dust without abrasion. Let's walk through the detailed steps involved in this specific test method.
First, we have Test Method La1: Circulating Air Pressure.
a. Before starting the test, the test specimen must undergo a visual, dimensional, and functional inspection as per the relevant specifications. This ensures that any pre-existing damage or issues are documented before exposure to dust.
b. The test dust used should be dry, fine, and non-abrasive. It must pass through a square mesh with a width of 75 mm and a wire diameter of 50 mm. This ensures the particles are of the correct size for the test.
c. The dust needs to be dried at 80°C for two hours to remove any moisture. Also, the same dust should not be reused more than 20 times to maintain consistency and accuracy during testing.
d. The airflow inside the sand and dust test chamber must move vertically, either upward or downward, and should not be laminar. The air flow rate should be sufficient to ensure an even distribution of dust particles throughout the chamber.
e. The relative humidity within the test chamber must remain below 25% to prevent condensation and maintain controlled environmental conditions.
f. The test specimen should be placed in the chamber in its original, non-packaged state, with the device turned off and ready for use.
g. Based on the operating conditions of the test specimen, select the appropriate air pressure condition from section 5.(1)a.(b). If the device generates a temperature cycle effect under normal operation, choose Test Category 1. Otherwise, go with Test Category 2 and adjust the pressure accordingly.
h. For Test Category 1, the specimen is exposed to a cyclic air pressure process for 2 hours, with dust introduced when the pressure returns to ambient levels. For Test Category 2, dust is introduced under atmospheric pressure and maintained for 4 hours.
i. If specified by the relevant standards, measurements should be taken either during or after the test to assess the impact of dust exposure.
j. After the test, the specimen is left in the chamber until all dust particles settle naturally.
k. The test piece is then placed under standard atmospheric conditions for 2 hours to allow it to return to its original state. Following this, another visual, dimensional, and functional inspection is conducted.
l. Before the final inspection, the surface of the test piece may be cleaned according to the applicable specifications, if required.
In the next part, we'll cover the second test method for fine dust testing. Stay tuned for more detailed information and practical insights!
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