BINDER C 150 - Manual (Page 79)

C 150 (E2) 12/2012 page 79/90
19. Technical description
19.1 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 (certi-
fied since December 1996 by TÜV CERT). All test equipment used is subject to the administration of
measurement and test equipment that is also a constituent part of the BINDER QM DIN EN ISO 9001
systems. They are controlled and calibrated to a DKD-Standard at regular intervals.
A record of this calibration and adjustment is part of the BINDER test certificate of the unit.
Adjustment in factory:
Temperature: 37 °C / 98.6 °F measured in the center of the usable volume
CO
2
: 0 vol.-% CO
2
(100 vol.-% N
2
) and 5 vol.-% CO
2
(sensor head directly exposed to analyzed test
gas)
Suitable reference methods applicable for the user for comparison between reference measuring results
and the display readings of the controller(s) are explained in chap. 12.
During factory calibration and adjustment, an electronic temperature measuring and display device is
used, which is traceable to an acknowledged standards/calibration institution (DKD or PTB for Germany),
bearing a valid calibration certificate.
During factory calibration and adjustment, test gases with an analyzed concentration and with adapted
flow quantity serve to calibrate the sensor system for CO
2
. The sensor head is exposed directly to the test
gas.
19.2 Over current protection
A miniature fuse accessible from the outside protects the device against over current. The miniature fuse
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. Replace the fuse only with a substitute of the same ratings. Refer to the
technical data of the respective device type. If the fuse is blown, please inform an electronic engineer or
BINDER service.
19.3 Definition of usable volume
The usable volume illustrated below is calculated as follows:
b
c
c
a
b
a
C
B
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 37: Determination of the useable volume
The technical data refers to the so 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 CO
2
incuba-
tor.
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 CO
2
.