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Section 5
Factory Installed Options
BUS Control Panel
The following section describes the configuration and operation of the
BUS.
Warning When activated, this unit injects liquid nitrogen or carbon
dioxide. Liquid nitrogen can cause serious freezing (frostbite) if it comes in
contact with unprotected skin or eyes. Nitrogen suppresses oxygen levels
and may cause suffocation if area is not well ventilated. Refer to Appendix
A for the proper handling of liquid LN
.
s
2
Caution Make sure the pressure relief valve on any LN
tank is adjusted to
2
30 PSI maximum blow-off.
s
Warning Carbon dioxide gas suppresses oxygen levels and may cause
suffocation if area is not well ventilated. Refer to "Handling Liquid CO
2
in Appendix B of this manual.
s
Figure 5-6. BUS Control Panel
Power - indicates the unit has AC power.
Low Battery - battery charge is low. The battery needs replaced or
recharged.
Solenoid Engaged - BUS has opened the solenoid so it can inject gas
(CO
or LN
).
2
2
Press-To-Test - activates the solenoid and injects LN
or CO
into the
2
2
freezer chamber as long as the button is depressed. The solenoid engaged
indicator should light. If the Low Battery indicator lights during the test,
replace the BUS battery.
Note Solenoid will not engage if door is open.
s
Thermo Scientific
Model 900 Series
5-5
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