Internal Components; Figure 1-2: Model 2120Xl Rear Panel - Teledyne 2120XL Operating Instructions Manual

Introduction
RS-232 Port
Gas Inlet and Outlet
Purge Connections
Instrument Air

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
Teledyne Analytical Instruments
Model 2120XL
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).
Serial digital concentration signal
output and control input.
One inlet and one vent.
Inlet and outlet connections for
purging the analyzer.
Used for driving optional auto
calibration valves.
6