BD / BF / ED / FD / FED (E3.1) 02/2022 page 74/116
16. Technical description
16.1 Factory calibration and adjustment
This chamber was calibrated and adjusted in the factory. Calibration and adjustment were performed using
standardized test instructions, according to the QM DIN EN ISO 9001 system applied by BINDER (certified
since December 1996 by TÜV CERT). All test equipment used is subject to the administration of measure-
ment and test equipment that is also constituent part of the BINDER QM DIN EN ISO 9001 systems. They
are controlled and calibrated to a DKD-Standard at regular intervals.
16.2 Definition of usable volume
The usable volume illustrated below is calculated as follows:
A, B, C = Internal dimensions (W, H, D)
a, b, c = Wall clearances
a = 0.1 x A
b = 0.1x B
c = 0.1 x C
V
USE
= (A - 2a) x (B - 2b) x (C - 2c)
Figure 12: Determination of the useable volume
The technical data refers to the defined usable volume.
Do NOT place samples outside this usable volume.
Do NOT load this volume by more than half to enable sufficient airflow inside the chamber.
Do NOT divide the usable volume into separate parts with large area samples.
Do NOT place samples too close to each other in order to permit circulation between them
and thus obtain a homogenous distribution of temperature.
16.3 Over current protection
Single-phase devices are protected by one (UL chambers) or two miniature fuses against over current,
accessible from the outside. The miniature fuses are located at the rear of the chamber above the power
cable connection. Each fuse holder is equipped with a fuse clip 5mm x 20 mm (cUL-Version 6,3x32 mm).
A fuse may be replaced only with a substitute of the same ratings. Refer to the technical data of the respec-
tive device type.
Two-phase devices are equipped with a resettable miniature circuit breaker (combination element).
Three-phase devices are equipped with an internal miniature circuit breaker.
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