Teledyne 2120XL, Operating Instructions Manual, Page: 71 / 85

Trace Nitrogen in Argon Analyzer Operation
Teledyne Analytical Instruments 59
N2: 123.0
pp
m
Δ 123 Span
where Δ 123.0 is a live display of the change in the adc.
When the change in adc value is reasonably small, the span
calibration is complete and the screen reverts to the Analyze mode
screen.
4.5.3 The Range Function
The Model 2120XL has three user programmable ranges extending
from 0-1 ppm to 0-100 ppm. The Range function is used to set the three
analysis ranges and to set whether the instrument functions on a fixed
range (1, 2 or 3) or uses auto ranging.
To set the range properties for your instrument, press the RANGE
button. The following screen appears:
R1: 1.00
pp
m R2: 10.00
pp
m
R3: 100.0
pp
m Rng: Auto
where either the 1.00, 10.00, 100.0, or Auto is blinking.
Use the ◄► arrow keys to position the blinking over the range
value to be changed . Then use the ▲ / ▼ arrow keys to modify the range
value. Continue with the ◄► arrow keys to position the blinking over
the next range value to be changed and modify with the ▲ / ▼ arrow
keys.
Move the blinking to the field at the far right of the second line and
set whether fixed analysis or auto-ranging is to be used. The field can be
toggled between these values:
1 (Fixed range analysis on range 1)
2 (Fixed range analysis on range 2)
3 (Fixed range analysis on range 3)
Auto Auto-ranging.
Press ENTER when the range properties have been correctly set.
Use ESCAPE to return to the
Analyze
mode without altering the range
settings.