If the temperature becomes unstable during operation of a constant temperature and humidity test chamber, what are the possible causes? Let’s take a closer look.

Poor sealing between the chamber body and door

Inadequate sealing or loose closing causes air leakage from the door, which impairs temperature accuracy in the test workspace.

Placement of test samples affecting internal heat convection

When samples that influence overall internal convection heat transfer are placed inside the chamber, temperature stability and accuracy will degrade.

Defects in structural design

Poor structural and spatial design fails to achieve uniform symmetry. Uneven structures (mainly in sheet metal design and processing) lead to temperature deviations.

Uneven heat conduction of chamber walls

The six walls of the working chamber have different thermal conductivity. Wiring holes, inspection ports, and test ports cause partial heat dissipation and conduction, making wall temperatures uneven and disrupting radiant heat transfer.

Improper selection and placement of test samples

Oversized samples or incorrect positioning/arrangement in the workspace block air convection, resulting in significant temperature accuracy errors.

Variations in inner chamber structure also cause uneven wall temperatures, disturb convection heat transfer, and reduce temperature stability.