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Appendix
A-2 Notes
1) Convert 4-20mA output to counts;
Where X=mA output
2) Convert 4-20mA output to engineering units;
(X-4/16) max value = Max Engineering Unit
The maximum engineering unit value should be 2x the
calibration sample value (mode 2 operation) or the sample with a
mode 1 fluorescence reading of 1999 counts.
3) Power Failure
Power failures <5 minutes in duration do not require unit
recalibration.
Power failures>5 minutes and <15minutes may require
recalibration. Verify fluorescence reading prior and after failure
is similar. The level of agreement is at the desertion of the
operator.
4) TIA utilizes two types of span filters; Metallic film ND filters are
used when fluorescent filters are not available for the application
specific excitations and emission wavelengths. The neutral
density filter reduces the measured signal bay a fixed percentage
whenever employed. For example, an ND may have a 70% pass
so if the process reading is 980 counts, inserting the span filter
will result in a reading of 686 counts (nominal).
5) Generally, the ref detector LED should always be solid green,
although flashing green is acceptable. Generally, in zero
fluorescencent material the measure detector LED should be
yellow, or flashing green Generally, in process or calibration
solution the measure detector LED should be flashing green or
solid green.
A solid red detector indicates to much signal intensity. Unit
must be returned to factory for evaluation.
A flashing yellow LED on either detector is a low signal level
and unit must be returned to factory for evaluation.
Teledyne Analytical Instruments
36
(X-4/16)1999 = Counts
Model 6650
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