Hanna Instruments ph 301 User Manual

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ing down" the electrode as you would do with
a glass thermometer.

If the bulb and/or junction are dry, soak the
electrode in HI70300  or HI 80300 Storage
Solution for at least one hour.

If  the filling solution (electrolyte) is more
than 1 cm (½") below the fill hole, add HI 7082
or HI 8082 3,5M KCl Electrolyte Solution
for double junction or HI 7071 or HI 8071
3,5M KCl+AgCl Electrolyte Solution for
single junction electrodes.

For a faster response, unscrew the fill hole
screw during measurements.

If the electrode does not respond to pH
changes, the battery is run down and the
electrode should be replaced.

Rinse the electrode tip with distilled water.

Immerse the tip (4 cm /1½") in the sample
and stir gently for at least 30 seconds.

For a faster response and to avoid cross
contamination of the samples, rinse the elec-
trode tip with a few drops of the solution to
be tested, before taking measurements.

To minimize clogging and assure a quick
response time, the glass bulb and the junc-
tion should be kept moist and not allowed to
dry out.

Replace the solution in the protective cap
with a few drops of HI 70300 or HI 80300
Storage Solution or, in its absence, Filling
Solution (HI 7071 or HI 8071 for single junc-
tion or HI 7082 or HI 8082 for double junction

AmpHel

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Remove the protective cap.

DO NOT BE ALARMED IF ANY SALT DE-
POSITS ARE PRESENT.

This is normal with electrodes and they will
disappear when rinsed with water.

During transport tiny bubbles of air may have
formed inside the glass bulb. The electrode
cannot function properly under these condi-
tions. The bubbles can be removed by "shak-

Reference
Filling Hole

Reference
Filling Hole

Fill Hole
Screw

Sensitive

Wire

Reference

Wire

Reference

Junction

Glass

Bulb

Glass
Bulb

Reference
Junction

Reference
Junction

Reference

Junction

Platinum or
Gold tip

Platinum or

Gold tip

Reference
Wire

Reference
Wire

Sensitive
Wire

Glass Body

pH Electrode

Plastic Body

pH Electrode

Plastic Body

ORP Electrode

Glass Body

ORP Electrode

Reference

Wire