Alternate Water Supply For Humidity System - Thermo Scientific 3906 Operating Manual

| Installation
Chapter 4
|
4-4 Model 3900 Series
NOTE
Thermo Fisher Scientific offers free water sample testing. For further
information contact our Customer Service Department.
Distilled or de-ionized water used in humidity reservoir must be within a water
quality resistance range of 50K to 1M Ohm*cm to protect and prolong the life of
the stainless steel. Use of water outside the specified range will decrease the
operating life of the unit and may void warranty.
The water inlet is the 1/8" FPT connection located on the rear top center of the
environmental chamber. For pressurized systems, water inlet pressure must not exceed
40 PSI. A manual shut-off valve should be installed between the main water supply and
the environmental chamber. A water strainer is provided that can be connected to the
back of the cabinet if desired.
To prevent mineral buildup on humidity generator walls, it may be necessary to
clean the humidity generator with a non-metallic abrasive pad and flush
thoroughly every two to three months. Refer to "Clean/Adjust Steam Generator"
on page 13-4 .

Alternate Water Supply for Humidity System

If an in-house water supply of the required purity range (50K to 1M Ohm*cm) is not
available, an alternate water supply method can be used. A large vented carboy (5 gal.
minimum) of water in the required purity range can be placed on top of the unit. The
provided ¼" hose barb fitting should be used to connect to the 1/8" FPT water inlet fitting,
located on the rear top center of the environmental chamber.
NOTE
To prevent accidental slip off of the connecting hose and flooding of the floor,
use of carboy with barbed fitting only.
NOTE
The maximum water consumption of this environmental chamber could be as
high as 2 gallons per day. When using an alternate water supply method, it is
recommended that the supply be checked periodically based on source
volume.
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