Connecting Co 2 Gas Supplies; Gas Guard For Co - Thermo Scientific 3110 Operating And Maintenance Manual

Gas Guard for CO

N (190640/190642)
2
Connecting CO
Supplies
Thermo Scientific
or
Model 3100 Series incubators can be equipped with a built-in gas guard
2
system that will operate with either a CO
gas guard can be installed on each unit. The gas guard uses two pressure
switches to continuously monitor the pressures of two independent CO
or N supplies and automatically switches from one supply to the other
2
when the supply pressure drops below 10 psig (68.95 kPa). The gas guard
is not designed to be used with multiple incubators.
Both of the CO
pressure regulators. The high pressure gauge at the tank should have a 0-
2000 psig range and the low pressure gauge should have a 0-30 psig range.
The gas supply to the incubator must be maintained at 15 psig (103.4
kPa) maximum. Gas pressures below 15 psig (103.4 kPa) may cause
nuisance alarms to occur on incubators equipped with the built-in Gas
Guard.
Optional
Exit for Optional
a
RS 485 Analog Wiring
Remote
a
Alarm
a RJ-11 telephone style connectors
c Used with optional Gas Guard system
Figure 6-6. Unit Back with All Connections
Gas
The CO inlets for a built-in gas guard are located on the rear of the
2
2
electronics drawer (Figure 6-6). Using 1/4" ID tubing, connect one of the
CO supply tanks to the fitting labeled CO2 Inlet #1. Connect the
2
second CO
hose clamps to secure the 1/4" ID tubing to the barbed fittings on the
regulator and the rear of the electronics drawer.
Warning Check for leaks at all connections.
or the N gas supplies must be equipped with two-stage
2 2
N Inlet
2
Air Makeup
b
Inlet
supply tank to the fitting labeled CO2 Inlet #2. Install 3/8"
2
or a N gas supply. Only one
2 2
d c
CO Inlet #1
2
c
CO Inlet #2
Convenience
2
Electrical Outlet
b Used with optional IR sensor
d Used with optional O
2
s
Water Jacketed CO
Section 6
Factory Installed Options
2
Power Cord
Connector
sensor
Incubator 6-5
2