Forma Scientific, Inc.
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2-2
To prevent mineral buildup on heater coils and
humidity generator walls, it may be necessary to clean the
humidity generator and immersion heaters with a non-
metallic abrasive pad and flush thoroughly every two or three
months. Refer to Section 4.2, Cleaning the Humidity
Generator and Immersion Heaters.
2.4 Attaching the Drain Lines
Note:
For location of drain line connection, refer to Figure 2-2 on the following page.
The Condensate Drain is located at the rear of the cabinet on the lower left side (labeled
DRAIN). A 3/8" MPT connection is required. The Door Condensate Drain (flexible tubing
connected to the door condensate eliminator) should be fed into the hole in the rear of the
chamber floor panel to return the condensate to the humidification reservoir.
The Chamber Drain (overflow from the humidification reservoir) is located on the rear
of the cabinet in the lower center area. This drain must be trapped to prevent CO2 drainage
from the chamber. A copper p-trap (Figure 2-1 and Item A of Figure 2-2) is provided with
the Model 3980 and must be installed. Attach vinyl tubing to the p-trap and route it to an
open drain.
2.5 Connecting the CO2 Source
For the most economical use, the liquid CO2
should be supplied from tanks without siphon
tubes, so that only CO2 gas enters the incubator
injection system. Two tanks may be joined
together with a manifold to ensure a continuous
supply of CO2.
A two-stage pressure regulator, with indicating gauges, should be installed at the
supply cylinder outlet. 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 input pressure to the incubator injection system. A
suitable two-stage pressure regulator is available from Forma Scientific, Inc.
Figure 2-1
Cabinet drain p-trap