28
• 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 time 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.
FIVE-POINT CALIBRATION (Ratio Turbidity only)
To perform a five-point calibration, continue the procedure with the following steps:
• Remove the fourth standard cuvette.
• Place the 2000 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 calibration
is saved and the display will briefly show
“
Store...
”. The instrument returns in the main
screen.
CALIBRATION ERROR MESSAGES
If the value of the standard read during the calibration is too far from the set value, the instrument
will display a standard low or a standard high message.
Check if the correct standard is used or prepare a fresh standard, if formazine is used, and repeat the
reading of the standard.
If the calculated calibration coefficients are
outside a certain range a calibration error
message is displayed.
