User guide

Introduction Model 2120XL
Teledyne Analytical Instruments 6
Calibration Contact
Notifies external equipment that
instrument is being calibrated and
readings are not monitoring
sample.
Range ID Contacts
Four separate, dedicated, range
relay contacts. Low, Medium,
High, Cal (not used).
RS-232 Port Serial digital concentration signal
output and control input.
Gas Inlet and Outlet One inlet and one vent.
Purge Connections Inlet and outlet connections for
purging the analyzer.
Instrument Air Used for driving optional auto
calibration valves.
Figure 1-2: Model 2120XL Rear Panel
1.6 Internal Components
The internal components can be accessed by removing the top
cover of the analyzer. Figure 1-3 shows an inside view of the analyzer