Purpose
The purpose of the Minimum Ignition Temperature of dust layers (MITdl) test is to determine the lowest temperature of a hot surface which can still ignite a dust layer.
This is relevant in most process facilities handling dusts if there is a possibility of the dust accumulating as a layer on a surface of (especially electric) equipment.
Method
Similar to the Minimum Ignition Temperature of dust clouds (MITdc), we perform this test based on EN 80079-20-2 “Explosive atmospheres – Part 20-2: Material Characteristics – Combustible dust test methods“.
A circular layer sample of 5 mm in thickness and 100 mm in diameter is heated on a hot plate at a constant temperature. In the process, we monitor the temperature of the sample layer and the hot plate. Varying the temperature of the hot plate until we find the minimum temperature of the hot plate capable of igniting the dust layer.
We can also assess the sensitivity of the dust to layer thickness by testing different layer thicknesses.
Benefit
Determination of the MITdl helps you understand the ignition sensitivity of your product when present as a dust layer in your facility on hot equipment.
The result is relevant for defining the maximum operating temperature for especially electrical equipment (together with the minimum ignition temperature of a dust cloud (MITdc)), i.e. choice of electrical equipment.
Minimum Ignition Temperature of dust layers test enquiries
Do you have any questions about the test? Please submit them through the form below.
