Optek AF45 - Page 39

Maintenance
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optek-Manual--1004-2003-02--AF45-US-2011-01-04
www.optek.com
9. Remove the filter holder.
Fig. 30 The removed reference filter's filter holder
10. Install the sealing cover with the O-Ring.
11. Screw-tighten the sealing cover.
12. Protocol the measuring result without reference filter.
The measuring results without reference filter should be the same before and
after validation! Differences bigger than +/- 0.002 CU indicate gas bubbles or
other impurities!
Evaluation of the
results
Evaluation example (all data given in CU):
The following values are given in the test certificate
and on the reference filter's
filter holder:
• Validation value: 0.869 CU
• Tolerance: +
0.03 CU
Thus, the admissible range is:
0.869 - 0.03 to 0.869 + 0.03 = 0.839 - 0.899 CU
The measured value coincides with the admissible value within the tolerance.
There is no indication of a sensor or converter malfunction.
If the measuring results are too high, the validation filter is dirty or the filter holder
is not installed correctly!
Tab. 14 Evaluation example
Measuring value
without refer-
ence filter (zero
value)
Measuring value
with reference
filter
Difference
between the
measuring val-
ues with and
without refer-
ence filter
Admissible
range
Evaluation
0.002 0.879 0.877 0.839–0.899 OK