Hanna Instruments HI 88703 - Manual (Page 24)

24
THREE-POINT CALIBRATION (Ratio Turbidity only)
To perform a three-point calibration, continue the procedure with the following steps:
• Remove the second standard cuvette.
• Place the 100 NTU standard cuvette (or the
third prepared formazin standard) into the holder,
with the cuvette mark aligned to the sign on the
instrument top.
• Close the lid and press the Read key. The display
will show the value blinking and the lamp icon
during measurement.
• At the end of the measurement, the fourth
proposed calibration point (750 NTU) is
displayed.
• At this moment it is possible to exit calibration
by pressing the
End key.
• If the calibration is terminated, the display will
briefly show
“Store...” and the three point
calibration is saved. The instrument returns in the
main screen.
FOUR-POINT CALIBRATION (Ratio Turbidity only)
To perform a four-point calibration, continue the
procedure with the following steps:
• Remove the third standard cuvette.
• Place the 750 NTU standard cuvette (or the
fourth prepared formazin standard) into the holder,
with the cuvette mark aligned to the sign on the
instrument top.
• Close the lid and press the Read key. The
display will show the value blinking and the lamp
icon during measurement.
• At the end of the measurement, the fifth proposed
calibration point (2000 NTU) is displayed.
• At this moment it is possible to exit calibration
by pressing the
End key.
• If the calibration is terminated, the display will
briefly show
“Store...” and the four point
calibration is saved. The instrument returns in the
main screen.