Explanation of the judgment of the surface temperature of the ventilation aging test chamber

It is mainly used to test wire and cable insulators or covered rubber specimens to compare the tensile strength and elongation
of the specimen before and after aging.

This machine uses hot air circulation mode to promote the aging of the test piece, the inner box is highly closed, the inner box air device is pumped, and the over-temperature automatic break protection device is provided
.

The temperature control of the ventilation aging test chamber is a PID digital display instrument, a single-point control temperature, automatic calculation, PV/SV simultaneous display, button setting, can set any temperature value
between normal temperature and zui high temperature.

So how do we judge whether the surface temperature of the ventilation aging test chamber is normal? Ventilation weathering test chambers are known to have high temperatures up to 200°C, 250°C and 300°C
.

When doing the test, due to the continuous increase in the temperature in the box, the surface of the box will also have a certain amount of heat, how to judge whether the surface temperature of the ventilation aging test chamber is normal, can be carried out in the following way: The working temperature of the ventilation aging test chamber reaches a high working temperature once and stabilizes for 2h, and the temperature of the surface of the box (80mm outside the door seam, motor hole, exhaust hole, etc.
) is tested with the point temperature, and the results should meet the following requirements: 1.
The high working temperature does not exceed 200 °C for the aging box, and the surface temperature should not be large room temperature plus 35 °C
.

2.
The working temperature exceeds 200 °C of the aging box, the surface temperature is determined by the calculation of the following formula: T≤Tr+35+(Tm-200)/10; Tr is room temperature, °C; Tm is the aging box high operating temperature, °C
.