Hanna Instruments HI 98703 - Manual (Page 23)

23
TWO-POINT CALIBRATION
• Turn the instrument on by pressing ON/OFF.
When the LCD displays dashes, the instrument
is ready.
• Enter calibration mode by pressing CAL.
The display will show “ CAL P.1” and no
suggested value. This first point is used to
check the optical system.
• Place the <0.1 NTU standard cuvette into
the holder and ensure that the cuvette mark
is aligned with the sign on the instrument
top.
• Close the lid and press READ . The display
will show blinking dashes and the icons for
cuvette, detectors and lamp will appear during
measurement. Alternatively, press
LOG/CFM
to skip the first point.
• The second calibration point (15.0 NTU) is
then displayed on the primary LCD, “ CAL P.2”
on the secondary LCD, and “ READ” tag will
blink.
• If the prepared formazin is used, edit the
displayed value by pressing ▲ or ▼ keys
until the display shows the correct value.
• Remove the first standard cuvette and place
the 15.0 NTU standard cuvette (or the
prepared one) into the holder and ensure
that the cuvette mark is aligned with the
sign on the instrument top.
• Close the lid and press READ . The display
will show blinking dashes and the icons for
cuvette, detectors and lamp will appear during
measurement.