Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 72)

Operation Model 4020
Teledyne Analytical Instruments 56
<▲▼> Use the <▲▼> keys to toggle between Auto and
Manual.
<Enter> Press when Auto is displayed on screen.
This sets the instrument in the Autoranging mode.
<Escape> Use Escape to move back to the Analyze Mode. Note that
the analyzer will now automatically switch analysis
ranges as the concentration rises above or below the
range limits.
4.6.13.3 D IGITAL M ODE
The digital mode (DGTL) for range selection uses the remote zero
and span inputs to select the range according to Table 4-1.
Note: The remote calibration feature (remote zero and remote
span) will be inoperable when the instrument is set for
digital range selection. Placing the instrument back into
either manual range selection or autoranging will
reestablish the functioning of the remote calibration
feature.
Table 4-1: Digital Range Selection Signals
Contacts
Zero Span Range
Low Low Autorange mode
Low High R3
High Low R2
High High R1
To use the digtal input range selection:
<▲▼> Scroll to the Range function using the UP/DOWN keys.
<Enter> Press to activate the RANGE function.