Teledyne 4020 – Hydrocarbon analyzer (special version for automatic background gas switching) - Manual (Page 80)

Operation Model 4020
Teledyne Analytical Instruments 62
Note: Make sure you reset the valve selection to the desired
mode after completion of either of these procedures.
4.6.17 Standby
This function allows you to place the instrument in STANDBY.
CAUTION: STANDY SHUTS DOWN POWER TO THE DISPLAYS
ONLY. INTERNAL CIRCUITS ARE STILL ENERGIZED
AND ELECTRICAL SHOCK HAZARD STILL EXISTS.
To place the instrument in STANDBY status:
<▲▼> From the MAIN MENU, scroll to the STANDBY
function using the UP/DOWN keys.
<Enter> Pressing places the instrument in STANDBY.
To exit STANDBY, scroll again to the STANDBY
function and press again.
4.7 Advanced User Functions
The Model 4020 provides additional functions for tailoring the
instrument to your specific application. These functions include:
 Analog Adjust
 Linearization
4.7.1 Zero Offset Adjustment
The software in this instrument provides a way to enter an offset to
the zero of the analyzer. This may be useful if, for example, the zero gas
is not pure and it contains some hydrocarbon. In this case, the reading
will have an offset that will be constant throughout its working range.
Thus, by entering an initial offset to the output (either current or
voltage), the display will match the output over the range of the
application.
Note: This adjustment only affects the % of range output of
Channel 1.