Teledyne 2120XL - Trace Nitrogen Analyzer - Manual (Page 70)

Operation Model 2120XL
Teledyne Analytical Instruments 58
▲/▼ arrow keys. Once the proper mode is displayed, press ENTER.
The following screen appears:
Span 100.0 pp m
to begin Span
This screen allows the user to input the known concentration of the
span gas used. Uuse the ▲/▼ arrow keys to enter the span gas
concentration. Press ENTER when finished.
4.5.2.3.1 Manual Span
If manual span mode was selected, the following screen appears:
39.25 pp m
to Finish
In the Manual Mode, the user has the opportunity to decide when
the span settling is close enough to the actual concentration to be valid.
When the value is sufficiently close to the known concentration and
sufficiently stable, press ENTER to accept the span calibration.
4.5.2.3.2 Auto Mode Span
If AUTO mode was selected from the Span Mode Selection screen
the following screen appears:
Span Settling: 0:58
The time value displayed at the right count down to zero from the
value currently held in Calholdtimer. See Section 4.5.1.9.
When the counter reaches zero, the display switches to display the
live adc change count.
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.