Teledyne 4020 - Hydrocarbon analyzer - Manual (Page 54)

Operation Model 4020
Teledyne Analytical Instruments 38
 BACKGROUND GAS: Allows the user to choose between
nitrogen or oxygen as the background gas.
Note: Each background gas has its own zero settings. The first
time you switch from one background gas to the other, the
instrument must be zero calibrated on that gas.
 VALVE SELECTIONS: Allows the user to switch between
sample and calibration gases from an input screen or
automatically depending on the instrument’s mode of
operation. Valve selection can also be disabled.
 STANDBY: Removes power to outputs and displays, but
maintains power to internal circuitry.
Any function can be selected at anytime. Just scroll through the
MAIN MENU with the DOWN/UP keys to the appropriate function, and
ENTER it. The analyzer will immediately start that function, unless
password restrictions have been assigned. (Password assignment is
explained in Section 4.6.7).
4.6.5 Data Entry
4.6.5.1 ENTER
The ENTER key is used in several context-sensitive ways.
1. When the selected option is a function on the MAIN MENU
screen, the function name appears with an arrow next to it.
The ENTER key is used to activate the function. The next
screen for that function or sub function will appear on the
VFD.
2. If the selected option is a modifiable item, the UP or DOWN
keys are used to increment or decrement the item to the value or
action you want. The ENTER key is then used to accept the
value and move you to the next field to continue programming.
3. When the last field is entered, ENTER takes you to the next
screen in the process, or if the process is completed, ENTER
takes you back to the ANALYZE screen.
4.6.5.2 ESCAPE
Pressing the ESCAPE key takes you back to the previous screen.