Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 81)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 65
mode, then you must adjust the zero of the instrument to read zero plus
the value entered as offset.
4.7.2 Background Gas Selection
The 4020 Analyzer can be used to analyze sample gas in a
background of either O
2
or N
2
. This menu is used to inform the
instrument which background gas is being used. The analyzer will then
apply the proper calibration parameters to the measurement process.
Note: Separate zero and span calibrations must have been
performed prior to using selected sample/background gas
for analysis.
To select a background gas:
<▲▼> From the MAIN MENU, scroll to the BACKGROUND
GAS function using the UP/DOWN keys.
<Enter> Pressing <Enter> activates the function and takes you to
the next screen.
<Enter> Use the <Enter> key to move over to the gas field (O2 or
N2).
<▲▼> Use the UP/DOWN keys to toggle between the two
options..
<Enter> Use the <Enter> key to accept the appropriate
background gas when it is displayed.