13
*If after switching on the protective device it triggers again, the Furnace must not be
operated. In that case the manufacturer or the manufacturer ‘s representative should be
addressed for the repairs of the Furnace.
In order to continually improve our products and their usage, supplements to this
publication may be introduced without notice.
15. ASSESSMENT TECHNIQUE OF THE PARAMETERS
TESTED PARAMETERS:
1. Verification of nominal temperature and temperature stability without charge,
2. Measurement of temperature distribution
TEST METHODS
All tests are performed when the electric Furnace is heated to the nominal temperature
set point and operates in the established temperature mode.
Before measuring the temperature stability, it is necessary to select the PID parameters
of the temperature controller (see User Manual of temperature controller).
1. Verification of nominal temperature and temperature stability is performed without charge.
In the cold Furnace, the control thermocouple is fastened as close to the working
thermocouple as possible. The nominal temperature is set at the temperature controller. When
the Furnace is heated and the thermodynamic equilibrium is settled, the control points of the
thermocouple are recorded in the interval of not less than 1 hour, every 60 seconds (but not at
longer intervals). The arithmetic mean of these values is the measured value of the nominal
temperature.
The maximum (positive and negative) temperature deviations from the average
temperature are temperature stability.
2. The temperature distribution is measured by thermocouples with the recorder. The
thermocouples are positioned at the corners of the chamber, from surfaces at a distance of 0.1
edge lengths, and in the center. At least five thermocouples are used. The nominal thermal
temperature is set. When the Furnace is heated and the thermodynamic equilibrium stabilizes,
the temperature is captured. The result is calculated according to the formula:
Where:
T - temperature distribution,
o
C;
T
max
- is the maximum temperature obtained during measurement at one of the points,
o
C;
T
min
- is the minimum temperature obtained during measurement at one of the points,
o
C;
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