Determination Of The Correction Factor; Definition; Method - ABB 4670 Series User Manual

APPENDIX B
B1 Determination of the Correction Factor
B1.1 Definition
Suspended solids:
The weight of solid, expressed as mg l
through a 1 to 2 m filter, dried to constant weight at 105C.
Samples not readily filtered:
The weight of solid, expressed as mg l
centrifuging sample at 3200 G, dried to constant weight at
105C.
-1 , obtained by filtration
-1
, obtained by
B1.2 Method
Follow the calibration procedures detailed in Section 8, then
carry out the following operations:
1) On Set Up Parameter page select mg/l.
2) Enter a FTU to mg/l correction factor of 1.0.
3) Take a note of the on-line value.
4) Take a grab sample for analysis to determine the 'true'
suspended solid value.
5) Obtain the correction factor by dividing the analyzed value by
the on-line value,
e.g. if analyzed value
and on-line value
(divide 150 by 100 = 1.5)
the correction factor is 1.5.
6) Enter the correction factor using the
Note. If the instrument is configured for suspended solids,
the calibration is still carried out as turbidity, using either the
dry standard or a formazine solution.
= 150
= 100
and keys.
41