Chapter 4: Performance Features and Safety Precautions
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Generally, 75-100 purge and fill cycles are required to reduce moisture
and oxygen levels below 1% (see Appendix D). 100-150 purge and fill
cycles will typically reduce moisture and oxygen levels to 0.3% or 3,000
ppm. After a 1% or less moisture and oxygen level is achieved, the other
two valves on the main chamber can be opened when they are connected
to a recirculating moisture and/or oxygen removal system. The
installation and operation of a removal system can further reduce and
maintain low moisture (<50 ppm) and oxygen (<5 ppm) levels. The
installation of the accessory Automatic Pressure Controller automates the
purge and fill process (up to 199 cycles). See Chapter 7 to order the
drying train removal accessories and the Automatic Pressure Controller.
3.
Transfer Chamber Vacuum Gauge
provides an indicator of vacuum
pressure in the transfer chamber. The indicator reads from 0 to 29 inches
of mercury vacuum.
WARNING: A steel reinforced high vacuum
sleeve must be used with full vacuum.
Note:
The Transfer Chamber Vacuum Gauge and High Vacuum Sleeve
are included on Precise Controlled Atmosphere Glove Boxes and can be
ordered from Chapter 7 for modification of Precise Basic Glove Boxes.
4.
Main Chamber Pressure Gauge
gives indication of main glove box
pressure. The gauge reads from -5 to +5 inches of water pressure.
Note:
The Main Chamber Pressure Gauge is included on Precise
Controlled Atmosphere Glove Boxes and can be ordered from Chapter 7
for modification of Precise Basic Glove Boxes.
5.
Glove Ports
are 8" nominal size and molded into the main glove box
shell. The double grooves provide two points of glove restraint for
containment and safe changing of the gloves.
6.
Neoprene Gloves
are supplied with the glove box, .015" thick, 30" long,
one pair, size 9 ¾. See Appendix A for replacement parts and Chapter 7
for a description.
7.
Removable Framed Glass Window
is 1/4" thick laminated safety glass
and is reinforced with powder-coated steel frame. The removable glass
window frame provides access to the interior for loading large apparatus.
When removed, the window opening is 26.4" wide x 12.5" high (670mm
wide x 317mm high). The framed glass window is sealed with a one-
piece molded neoprene gasket. See Chapter 7 for optional Acrylic
Viewing Window with Frame.
8.
Fluorescent Lamp
provides 30-40 foot candles of interior illumination
on the work surface. The lamp may be replaced from outside the glove
box. See Chapters 6 and 7 for replacement.
9.
Control Panel
consists of the main chamber pressure gauge, transfer
chamber vacuum gauge, and control switches for the light and duplex
outlet.
10.
Work Surface
is black chemically-resistant phenolic core and sealed to
the glove box floor. The black surface aids proper cleaning and provides
improved visibility of white powders. Phenolic core has superior
chemical resistance and stain resistance.
