Manual

Introduction Model 2120
CAUTION: THE DISPLAY METER INDICATES A LOW LEVEL
IMPURITY ANALYSIS WHILE IN THIS MODE. THIS IS
NOT THE ACTUAL NITROGEN CONCENTRATION.
Range Switch: Used to select the measurement range maximum
ppm.
Digital Panel Meter (DPM) — Displays the nitrogen
content of the sample stream in ppm.
Note: When there is no sample flow or there is a loss of
ionization voltage, or when the impurities are out of range
(i.e. , > 2 ppm in the 2 range, > 20 ppm in the 20 range,
and > 200 ppm in the 200 range), the DPM displays "1"
(the number one with a decimal point and no additional
digits). The maximum number the meter reads before it
goes to "1" is 1.999 in the 2 ppm range, 19.99 in the 20
ppm range, or 199 99 in the 200 ppm range.
Zero Potentiometer: Used for calibration with zero gas.
Span Potentiometer: Used for calibration with span gas.
Sample Flow Rotameter: Monitors flow rate of gas to the
analytical cell.
1.5 Rear Panel
Connections and other controls are located on the rear panel of the
analyzer, as shown in Figure 1-2. This includes:
Power Entry Module — Main power on/off function, connector
for input power cable, and fuse holder for the analyzer. This
module protects the analyzer from input power surges and the
power supply from short circuits.
Sample Input Port — 1/4-in (0.64 cm) VCR fitting marked
INPUT. This fitting is used to connect the sample inlet line to
the analyzer.
4 Teledyne Analytical Instruments