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Page 15
Span Calibration
7. Place the Turbidity sensor into a sample of Turbidity standard. If
possible, the vessel should have black or dark floor and walls to avoid
reflection affecting the reading. Ensure that it is immersed correctly,
as per the diagram in step 4, above.
8. Select Calibration (
→
→
→
→
F1:Cal.
). The following screen will be
displayed…
901*NTU 25.0ºc
F1:Cal at 900.NTU
9. When the reading has stabilised, press
to calibrate. The “
∗
∗
∗
∗
” will
now be replaced by a decimal point if calibration was successful.
10. The
WP-88
is now calibrated for Turbidity and is ready for use in this
mode. Ensure that the
WP-88
is calibrated on the range in which it will
be used.
Discard the used samples of distilled water and standard.
Ensure that the sensor is immersed with at least the same clearance
as per the diagram in step 5 for all sample measurements.