Thermo Electron Corporation Model 48i Instruction Manual 9-1
Chapter 9 Optional Equipment
The Model 48i is available with the following options:
• “Internal Zero/Span Assembly” on page 9-1
• “Internal Zero Air Scrubber” on page 9-1
• “Filter Wheel Purge” on page 9-1
• “Teflon Particulate Filter” on page 9-3
• “I/O Expansion Board Assembly” on page 9-3
• “Terminal Block and Cable Kits” on page 9-3
• “Mounting Options” on page 9-4
Internal Zero/Span
Assembly
With the internal zero/span assembly option, a source of span gas is
connected to the SPAN port and a source of zero air is connected to the
ZERO port. Zero and span gas should be supplied at atmospheric pressure.
It may be necessary to use an atmospheric dump bypass plumbing
arrangement to accomplish this.
For more information, refer to the “Installation” chapter and the
“Operation” chapter.
Internal Zero Air
Scrubber
The internal zero air scrubber is mounted inside the instrument and
provides a source of zero air.
Filter Wheel Purge The filter wheel purge option includes a housing attached between the
optical bench and the motor plate (Figure 9-1). It surrounds the gas
correlation wheel and allows purging the area around the gas correlation
wheel with a gas other than that present in the local atmosphere. This
option increases reliability in the presence of contaminants that could
interfere with the analytical process.
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