C (E3) 08/2015 page 16/93
2.3 Connection panel at the rear of the unit
(12) (13) (14) (15) (16)
Figure 7: Rear connection panel C 170
(12) Miniature fuses
(13) Connection for IEC connector plug
(14) Ethernet interface for computer communication (option)
(15) Connection socket for zero-voltage relay alarm contact
(16) Quick acting closure socket for CO
2
gas cylinder
2.4 Unit doors
The outer door of the C 170 is equipped with a heater on its inner side. The door must be closed while the
unit is operating normally in order to ensure stable climatic conditions in the inner chamber.
An additional glass door enables viewing of the samples without disturbing the temperature in the interior
and contaminating the samples sealing the interior of the C 170.
When the outer door is open, the CO
2
intake valve automatically closes.
Delay time for the temperature and CO
2
tolerance range alarm :
After closing the outer door, the tolerance range alarm is turned off for a programmable delay
time. This prevents alarms being constantly triggered during the unstable operating phase
after opening the outer door.
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