BINDER KB 23 - Manual (Page 85)

KB (E3.1 + E5.1) 11/2014 page 85/100
20. Technical description
20.1 Factory calibration and adjustment
This unit 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
measurement 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.
20.2 Over current protection
All chambers except KB 720-UL are protected by a unit-protection against over current, accessible from
the outside. It is located at the rear of the chamber below the strain relief of the power cord. The fuse
holder is equipped with a fuse clip 5mm x 20 mm (cUL-Version 6.3 x32 mm). Replace this fuse only with a
substitute of the same ratings. Refer to the technical data of the respective device type. If this fuse is
blown, please inform an electronic engineer or BINDER service.
KB 720-UL is equipped with an internal fuse not accessible from outside. If this fuse is blown, please
contact an electronic engineer or BINDER Service.
20.3 Definition of usable volume
The usable volume illustrated below is calculated as follows:
b
c
c
b
a
C
B
A
a
A, B, C = internal dimensions (W, H, D)
a, b, c = wall separation
a = 0.1*A
b = 0.1*B
c = 0.1*C
V
USE
= (A - 2 * a) * (B - 2 * b) * (C - 2 * c)
Figure 24: Determination of the usable 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 and humidity.