Remote Alarm Connector - Thermo Scientific CRYO Plus 1 Operating And Maintenance Manual

Section 1
Quick Start-Up
Fill (continued)
Remote Alarm
Connector
1-6 7007400 Cryoplus
When electric power and LN
on the power switch to begin filling the unit. Because the unit must go
from ambient room temperature to -196°C, considerable boiling of the
liquid nitrogen takes place, turning into super-cooled nitrogen gas which
flows over the side of the open chamber. As this occurs, frost becomes
visible around the top of the unit. This is normal during the initial fill
with the lid open and disappears once the unit has stabilized.
As the unit fills, the bar graph on the front of the cabinet monitors the
progress by displaying the liquid level (green lights), the high and low limit
set points (flashing orange). Refer to Section 2. The storage container fills
until the liquid Nitrogen reaches the high level set point and the 5-inch
flashing orange LED changes to flashing red. The LN
now in full automatic operation.
After the initial fill is complete, close the lid and allow the unit to stabilize
for 8 to 10 hours, or overnight, before changing the high or low level
setpoints or adding inventory.
Caution Some popping or cracking noises may be heard after the unit is
initially filled and the lid is opened and closed the first few times. This is
normal and quickly disappears.
The CryoPlus control system provides remote alarm contacts, wired to an
RJ-11 connector on the back of the cabinet. Figure 1-4 identifies the pin
connections.
Figure 1-4. RS232 and Remote Alarm Contact Connections
Figure 1-5. Alarm Contacts Junction Box Wiring
have been connected, open the lid and turn
2
▲
storage container is
2
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