Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 79)

Total Hydrocarbon Analyzer Operation
Teledyne Analytical Instruments 61
4.6.16.4 O BSERVING THE GAS S TREAM C ONCENTRATIONS
The actual gas concentrations of the gas streams can be observed
using two different methods:
1. Use the USER SELECT option of the VALVE
SELECTIONS menu and choose the appropriate valve to
open from the second line of the display. Then return to
Analysis mode by repeatedly pressing and observe
the concentration of that stream on the display.
Note: With this technique, the alarms are not suppressed and
depending on the gas and the alarm setpoint, it could
trigger an alarm.
2. Use the DEFAULT option of the VALVE SELECTIONS
menu and select the SPAN (or ZERO) function from the
MAIN MENU. With the SPAN (or ZERO) function
selected, select MANUAL FINISH from the first line of the
display on the SPAN or ZERO submenu. The display will
show:
Or
Note: The actual displayed concentration may be different
depending on your calibration gas.
Then begin the span or zero routine and observe the
concentration on the screen. Since the analyzer is in a calibration
mode, the alarms will be suppressed.