Special Function Setup; Offset Output / Reverse Output; Output Signal Reversal - Teledyne 7120 Operating Instructions Manual

4 Operation
Note: The span gas use to span the analyzer must be >90% of the
range being analyzed.
Before starting linearization, perform a standard calibration. See section
4.4. To enter data:
From the MAIN MENU screen—
1. Use UP/DOWN to select ALGORITHM , and Enter.
2. Select and Enter SETUP.
3. Enter AUTO from the Calibration Mode Select screen.
The Auto Linearize Mode data entry screen appears.
5. Use the UP/DOWN keys to set the proper value of calibration
gas, and Enter. Repeat this step for each cal-point number as it
appears in the Input (x) parentheses.
6. Repeat step 5 for each of the special calibration gases, from the
lowest to the highest concentrations. Escape when done.
To end the session, send:
st<enter>
st<enter>
to the analyzer from the computer.

4.9 Special Function Setup

CAUTION: The programming functions of the output signal
reversal, polarity reversal and gain preset are config-
ured at the factory to the users application specifica-
tion. These functions should only be reprogrammed
by trained, qualified personnel.
4.9.1 OFFSET OUTPUT/Reversal Output

4.9.1.1 Output Signal Reversal

Some applications require a reversal of the output signals in order for the
4-20mA and 0-1 V DC output signals to correspond with the low and high end
of the concentration range. For example, if an application involves the analysis
of 85-100% oxygen in a background of argon by measuring the thermal conduc-
4-32
1.95 %
Input(Ø) :2.00
Teledyne Analytical Instruments
CO2
Model 7120