Thermo Electron Corporation Model 42i Low Source Instruction Manual 9-1
Chapter 9 Optional Equipment
The Model 42i Low Source is available with the following options:
• “Internal Zero/Span and Sample Valves” on page 9-1
• “Permeation Dryer Assembly” on page 9-2
• “Teflon Particulate Filter” on page 9-2
• “Ozone Particulate Filter” on page 9-2
• “NO2-to-NO Converters” 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
and Sample Valves
With the 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 as shown
in Figure 9-1. 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. If this option is
installed, refer to the “Operation” chapter for more information.
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