Forma Scientific, Inc.
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4-9
2. Remove the plastic protective cap from the fill fitting.
3. Connect the 3/8" I.D. vinyl tubing between the fitting and the distilled water tap.
4. Open the tap until water flows steadily into the water jacket.
Caution: A high rate of flow and high pressure can cause distortion to incubator
chamber walls.
5. Turn the water off immediately when the ADD WATER alarm light goes out.
6. Using the funnel, add an additional quart (one liter) of distilled water.
7. Remove vinyl tubing and reinstall the plastic protective cap.
4.11 CONNECTING THE OPTIONAL GAS GUARD (Refer to Figure 4-5)
a. Connecting the Outlet of the Gas Guard to the Incubator's Gas Inlet
Before connecting the gas supply tanks, connect a piece of supply tubing between the
outlet fitting and the gas inlet(s) on the back of the incubator. If both chambers are to be
monitored by the gas guard both inlets need to be connected. The gas outlet is located
between Tank 1 and Tank 2 inlet fittings. Check the connections for leaks.
b. Connecting The CO
2
Supply Tanks
Note: Output pressure from the tanks must be regulated with a dual stage pressure
gauge set at 15 PSIG. Liquid substances must be supplied in tanks without
siphon tubes to ensure that only gas enters the incubator.
The high pressure gauge should have an indicating range of 0 to 2000 PSIG to monitor
tank pressure. The low pressure gauge should have an indicating range of 0 to 30 PSIG to
monitor actual input pressure to the incubator injection system. A suitable two-stage
pressure regulator is available from Forma Scientific, Inc., Stock #965010.
Supply pressure lower than 13.5 PSIG will cause improper operation of the gas guard
and may cause the occurrence of nuisance alarms. Pressure higher than 15 PSI will
damage the CO
2
control system.
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