Hanna Instruments hi 9811 사용자 설명서

6

OPERATIONAL GUIDE

INITIAL PREPARATION

Each meter is supplied complete with a 9V battery. Remove the
battery compartment cover on the back of the meter and install the
battery while paying attention to its polarity.
Connect the probe to the DIN socket on the top of the meter by
aligning the pins with the socket and pushing in the plug.
Always remove the electrode protective cap before taking any mea-
surements and make sure the meter has been calibrated before
taking any measurements.
Turn the meter on by pressing the ON/OFF key.

TAKING  pH MEASUREMENTS

If the probe has been left dry, soak the tip in HI 70300 storage
solution for a few minutes to reactivate it.

• To take a pH measurement simply submerge the

tip (4cm/1½") of the probe into the sample to
be tested.

• Select the pH mode.

• Stir briefly and wait a couple of

minutes for the reading to adjust
and stabilize. The display shows
the pH value.

• If measurements are taken in different samples successively, it is

recommended to rinse (clean) the probe thoroughly to eliminate
cross-contamination. After cleaning, it is recommended to rinse
the probe with some of the next sample to be measured.

TAKING EC/TDS MEASUREMENTS

• Immerse the tip of the probe (4cm/1½") into the

sample to be tested. If possible, use plastic beakers
or containers to minimize any EMC interference.

• Tap the probe lightly on the bottom of the

beaker to remove any air bubbles which may be
trapped inside the tip.