Model 3050/3052 3-1
Thermo Scientific
Section 3
Control & Indicating Devices
Control Switch
The Control switch controls power to the Gas Guard control circuit
board. The yellow LEDs on the front panel designate which tank is
active and indicate the unit is receiving power.
Silence Switch
The Silence switch silences the alarm and selects the alternate tank. If the
Silence switch fails to silence the alarm, it is an indication that both gas
tanks are depleted or incapable of producing 15 PSIG.
Warning
During initial start-up, the incubator connected to the Model
3050/3052 Gas Guard should not be injecting gas.
s
Gas Depletion Alarm
The gas depletion alarm sounds automatically when the active supply
tank becomes empty. The other tank becomes active with the sounding
of the alarm.
Note
Should both supply tanks become depleted, the only way to silence
the alarm is to turn the CONTROL switch to Off.
s
Active Tank Indicating Lights
The two yellow indicating lights, labeled TANK1 On and TANK2 On,
located on the front of the control panel, show which gas tank is active.
Pressure Low
On
Pressure Low
On
Off
Control
On
Gas Guard
T
A
N
K
1
T
A
N
K
2
Silence
Figure 3-1.
Front View
