Teledyne 7320 - NDIR analyzer - Manual (Page 70)

4 Operation Model 7320
4-32 Teledyne Analytical Instruments
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.
1.95 % CO2
Input(Ø) :2.00
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
st
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-