TM 5-6640-212-14
b. Cabinet Data.
2-49. Water Demineralizer Unit.
(1)
Molded rubber gasket for door.
a. Description. The water demineralizer unit is wall
(2)
Shelf runners to hold shelves or tray (set
mounted on the right side wall of the laboratory, above
of two).
the sink (fig. 1-2). It consists of two Barnstead water
demineralizer cartridges mounted in wall brackets. The
(3)
Tray, stainless steel 8 by 9 by 5/8 inch
cartridge color coded red contains a mixed resin bed
(203 mm by 228.5 mm by 15.9 mm) inch.
used to remove inorganics from water. The cartridge
(4)
Shelf, asbestos with twelve 7/8-inch
color coded black contains a resin bed used to remove
diameter holes.
organics from water.
(5)
Manual relief valve, disk only.
b. Operation.
(6)
Double action bar lock.
(1)
Using 3/8 inch (9.5 mm) (inside
NOTE
diameter) plastic or rubber tubing, connect the inlet hose
This desiccating cabinet is not intended
nipple (bottom of organic removal cartridge) to the
for the purpose of maintaining a
demineralizer water supply. Connect the outlet hose
negative or positive pressure.
nipple (top of organic removal cartridge) to the inlet hose
c. Operation.
nipple (bottom) of mixed resin cartridge. Connect the
(1)
To close the door, it may be necessary
outlet hose nipple (top of mixed resin cartridge) to a
to force the door tightly against the jamb before turning
suitable demineralizer water container.
the handle. Be sure the square rods enter the top and
(2)
The basic limiting factor on flow rate is
bottom keepers before tightening the lock.
pressure (25-pounds per square inch gage design). The
NOTE
normal optimum flow rate is 10 gallons per hour. The
Do not turn the handle any more than
direction of flow of the water through the cartridge must
is necessary to seal the door.
be from the bottom up.
Balance of movement should be
CAUTION
reserved for future adjustment.
Do not shut off or restrict the flow of
(2)
Before opening the door, normalize the
the outlet tubing.
pressure in the cabinet by opening the manual relief
(3)
Water or other solutions purified by ion
valve located in the upper righthand corner.
exchange resins are not necessarily free from odor,
(3)
Place a thermometer in the cabinet with
color, or taste which may make it unsuitable for some
the heated samples. Note temperature rise. Do not open
purposes. In some instances color, taste, or odor may be
the door until the temperature returns to ambient.
introduced to the finished product by trace quantities of
either free amines or low molecular weight polymers
the front wall of the laboratory, to the left of the gum bath.
which are present in the fresh, untreated resin.
The purging blower and the light are activated by
Generally, the amine odor will lessen or disappear after
switches located on the left side wall near the ice maker.
passage of a few gallons of water through the cartridge.
The fume hood incorporates two vaporproof electrical
2-50. Desiccating Cabinet.
a. Description. The desiccating cabinet is
access to the interior. Five stopcocks in the unit provide
designed to comply with the requirement specified in
capability for the use of water supply, water return, air,
ASTM Method D2276 (TM 10-1166). It is wall mounted
propane, and vacuum. The fume hood is used to protect
above the analytical balance, on the right front side of the
the operator from toxic, corrosive, poisonous, explosive,
laboratory. It is constructed of stainless steel with glass
radioactive, odoriferous, and other harmful and
side panels. The molded rubber door gasket fits snugly
dangerous materials, It provides an area in which solids
to provide an airtight fit.
can be crystallized by controlled evaporation, and in
which heat and steam can be removed from hot
objectives.
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