Teledyne 5000B - Near Infrared Photometer - Manual (Page 76)

4–8
4 Operations/Analysis Unit
Teledyne Analytical Instruments
A Business Unit of Teledyne Electronic Technologies
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 5020 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.
DIRECTIONS FOR USING TELEDYNE CALIBRATION OPTIONS
FOR ON-LINE PROCESS PHOTOMETRIC ANALYZERS
I General
These calibration options consists of procedures for calibrating analyzers
on-line. These techniques are offered when process conditions (high
pressures, temperatures, sample phase changes) are extremely difficult to
deal with and calibration standards are impossible, difficult to obtain, are
too expensive to use due to volume consumption into the system, are
unstable, or are difficult to introduce into the analyzer or sample system
because of toxicity, pressure, etc. Also many times the sample stream
composition is difficult to match with a calibration fluid.
In one case an optical absorbing filter(s) is inserted into the light path
of the analyzer. The absorber is actuated by a switch(s) located on
the readout panel of the control unit. The option functions by pre-
senting a calibrated and reproducible absorbance or fluid into the light
path of the analyzer.