Teledyne 7300A manual Special Function Setup, Offset OUTPUT/Reversal Output Output Signal Reversal

4 Operation Model 7300A

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<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 Teledyne Analytical Instruments