Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) User Manual
Page 75
Total Hydrocarbon Analyzer
Operation
Teledyne
Analytical
Instruments
57
4.6.15 Fuel Display
This screen displays the fuel type this instrument is set up for:
40%H2/60%N2, or 100% H2, or 100%N2. It is an information only
screen and has no bearing on the analyzer performance.
4.6.16 Valve Selections
This 4020 analyzer has the option of 3 input streams. The rear panel
of the analyzer has 3 gas inputs labeled: “SAMPLE", "SPAN" and
"ZERO".
The particular gas stream sent to the analyzer can be determined in
one of three ways:
1. Valve selection disabled. This option has the “SAMPLE”
valve always open, typically to deliver sample gas to the
analyzer.
2. User Select . The user can select which port opens to the
analyzer.
3. By Function: In this option, a specific gas port opens to the
analyzer depending on the current mode of the analyzer. For
instance, when performing a zero calibration, the “ZERO”
port would be open while “SAMPLE” and “SPAN” ports
would be closed.
To enable/disable or select a specific valve selection mode:
<▲▼>
From the MAIN MENU, scroll to the VALVE
SELECTIONS function using the UP/DOWN keys.
Press
screen.
<▲▼>
Use the <▲▼> keys to toggle between the Disabled,
User Select and Default (by Function) modes.
<Enter>
Press
on screen.