Teledyne 2120 - Trace Nitrogen in Argon Analyzer - Manual (Page 15)

Trace Nitrogen in Argon Analyzer Introduction
Figure 1-2: Model 2120 Rear Panel
• Recorder Contacts — A standard barrier terminal connection is
installed for connecting a recorder or other external meter to the
analyzer.
• Test Point Contacts —Provides an mVDC output signal
connector for a DC multimeter and is used during calibration.
• Overrange Alarm Contacts* — Normally open and normally
closed dry contacts for indication of impurities at levels too
high for analyzer's range of detection. Rated for 0.5 A at 30
VAC.
• Range Identification Contacts* — These contacts are closed
when the lower range is selected on the front panel of the
analyzer and open for the high range. Rated for 2 A at 30
VAC.
• Sample Vent Port — 1/4-in (0.64 cm) Swagelok compression
fitting marked VENT. Used to connect the sample outlet line to
the vent system.
• 1 P28 Plate Adjustment — A 10-turn, 10 K variable plate
voltage adjustment for the high voltage applied to the plates of
the PMT by the high-voltage DC power supply.
• Identification Plate — This plate identifies the model #, serial
#, range, etc.
• Test Points — Test jacks are installed to test the voltage outputs
of the amplifier board, the low-voltage power supply, and the
255 Hz power supply.
*Note: A fuse must be used for any circuit attached to the
overrange alarm or range indication contacts .
Teledyne Analytical Instruments
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