Teledyne 2120 - Trace Nitrogen in Argon Analyzer - Manual (Page 18)

Introduction Model 2120
13. Low-Flow Switch — Works by magnetic levitation. When
sample flow drops below the flow switch setpoint, the switch
makes and pulls in the double-pole relay.
14. Rotameter Inlet and Outlet Connections — 114-in (0.64-cm)
Swagelok compression fittings used to connect the sampling
lines to the rotameter.
15. Zero and Span Potentiometers — Used for calibration with
zero and span gas.
16. Test Jack Panel — Used to check the 255 Hz power supply,
the +15 and -15 VDC power supply, and the 0-10 mV input to
the 4-20 mA output module.
17. 4 - 20 mA Module — Provides a fully isolated DC output in
proportion to impurity level.
18. Amplifier Board — Conditions the electrical impurity signal
from the PMT and contains overrange alarm circuit.
Figure 1-4: Internal Components in Card Cage
1.7 Additional Safety Information
Note: The material provided in this section contains information
to promote safety in the operation and maintenance of this
equipment. It is not intended to supersede, replicate, or
replace any safety documentation or procedures provided
from or established
by official safety sources.
Do NOT operate the Model 2120 Trace Nitrogen in Argon Gas
Analyzer until you read and understand the operating,
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Teledyne Analytical Instruments