Teledyne 2120XL - Trace Nitrogen Analyzer - Manual (Page 41)

Trace Nitrogen in Argon Analyzer Installation
Teledyne Analytical Instruments 29
CAUTION: AIR PRESSURE LESS THAN 65 PSIG WILL RESULT
IN A FLOW RESTRICTION.
4. Connect the span and zero lines to the rear panel fittings
supplied for this purpose. The span and zero gas inputs must
be pressure regulated to the same pressure as the sample gas
(4-20 psig).
Note: If this instrument is without the auto calibration option,
there will be no rear panel fittings for zero and span
gases. The customer must install a suitable valve switching
manifold or tee the calibration gases with valves into the
sample in line.
3.6.1 Typical Sample System
A suggested sample system is shown in Figure 3-6. This system
allows you to switch the analyzer between zero or span calibration
gases and the process gas streams quickly and efficiently without
disconnecting the analyzer and introducing air in the system.
Figure 3-6: Suggested Sample System