Teledyne 514 Instruction Manual page 38

4.0 Operations
balance ring is used, it should be placed over the screen.
c. After screening to bring the measuring voltage to within
5. Turn the NORM/ZERO switch to ZERO. The analysis section
meter should be made to read zero by adjusting the coarse
ZERO control on the analysis section power module.
6. Check the control module SPAN setting to make sure it agrees
with the calibration results obtained by TAI (see Specific
Application Data in the Appendix).
7. Adjust the ZERO control on the control module to give a zero
reading on the control module meter.
8. Add span fluid (see Span Fluid, above) to the sample cell. Make
certain that all of the zero fluid is displaced.
9. Adjust the control module SPAN control to obtain the correct
meter reading with reference to the concentration of span fluid.
For example, if the sample contains 100% of whatever the
instrument is set up to analyze, then the SPAN control must be
adjusted for a full scale reading, i. e., 200 ppm water in EDC.
10. Re-check the ZERO setting with zero fluid.
11. If desired, the linearity of the analyzer can be checked with a
fluid intermediate in concentration between the zero and the
span fluid.
12. The analyzer is now calibrated. It is often desirable to check
calibration (fine tune) on a dynamic sample from your process,
double checking the 514 analyzer response with laboratory
analyzed grab samples. This is desirable where there is a
possibility that your sample stream may have some background
materials not in the makeup of the calibration fluid.
13. From time to time, re-check the zero setting. If it is found that
there is no zero drift, re-checking the zero setting may become
unnecessary or may be performed only on an occasional basis.
14. Some optical filters used in some applications will be so
temperature sensitive that screening must be performed with the
filters near the operating temperature.
4–8
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
10% of the reference voltage, adjust R3 as in step a
above to make the measuring peak voltage read the
same as the reference peak voltage.