Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 76)

Operation Model 4020
Teledyne Analytical Instruments 60
There are three choices within the User Select option corresponding
to the valve the user elects to be open to the analyzer (Sample, Span or
Zero). The second line of the display will indicate the current valve
selection.
To select the valve to be opened to the analyzer:
<▲▼> From the VALVE SELECTIONS menu, Use the <▲▼>
keys to toggle the option to USER SELECT
Press to bring up the USER SELECT screen.
▲▼>
Use the <▲▼> keys to toggle between the options of:
“ALWAYS SAMPV” (sample valve)
“ALWAYS SPAN” (span valve)
“ALWAYS ZERO” (zero valve)
<Enter> Press when the appropriate valve selection is
displayed on screen.
<Escape> Use Escape to move back to the Analyze Mode. Note that
the analyzer will now switch gas to the analyzer from the
selected port regardless of whether the analyzer is in
analyze or calibration mode.
As an example of the display in Analyze mode when USER SELECT
is the current valve selection mode and “Always SAMPLE” valve is
chosen, the display will be as follows:
or when in SPAN mode: