Hanna Instruments electrodes User Manual

Rinse the electrode tip with distilled water.

Immerse the tip in the sample and stir gently for approx. 30 seconds.

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

To minimize clogging and ensure a quick response time, the glass
bulb and the junction should be kept moist and not allowed to dry out.

Replace solution in the protective cap with a few drops of HI70300
Storage Solution or, in its absence, Filling Solution (HI7071 for
single junction or HI7082 for double junction electrodes). If none of
the above is available, tap water may also be used for a very short
period  (couple of days). Follow Preparation above before taking
measurements.

Note: NEVER STORE THE ELECTRODE IN DISTILLED WATER.

Inspect the electrode for any scratches or cracks. If any present,
replace the electrode.

Rinse off any salt deposits with water.

Drain the reference chamber with a syringe and refill it with fresh
electrolyte (HI7071 for single junction or HI7082 for double junction
electrodes). Allow the electrode to stand upright for 1 hour.

Follow the Storage Procedure above.

General - Soak in Hanna HI7061 General Cleaning Solution for
approximately 1 hour.

Removal of films, dirt or deposits on the membrane/junction:
- 

Protein

Soak in Hanna HI7073 Protein Cleaning Solu-
tion for 15 minutes.

- 

Inorganic

Soak in Hanna HI7074 Inorganic Cleaning
Solution for 15 minutes.

- 

Oil and grease

Rinse with Hanna HI7077 Inorganic Cleaning
Solution.

IMPORTANT: After performing any of the cleaning procedures rinse the
electrode thoroughly with distilled water, drain and refill the reference
chamber with fresh electrolyte, (not necessary for GEL filled electrodes)
and soak the electrode in HI70300 Storage Solution for at least 1 hour
before taking measurements.

pH Meter: Follow attentively the meter's operating and calibration proce-
dures from the instruction manual.

Electrode: Evaluate your electrode performance based on the following
possibilities.

Noise (Readings fluctuate up and down) could be due to:
- Clogged/Dirty Junction: Refer to Cleaning Procedure above.
- Loss of shielding due to low electrolyte level (in refillable electrodes
only): Empty electrolyte with a syringe and refill with fresh HI7071 for
single junction or HI7082 for double junction electrodes.

Dry Membrane/Junction: Soak in Storage Solution HI70300 for at
least 1 hour.

Drifting: Soak the electrode tip in warm Hanna Solution HI7082 for
one hour then flush tip with distilled water. Refill with fresh HI7071 for
single junction electrodes and HI7082 for double junction electrodes.

Low Slope: Refer to Cleaning Procedure above.

No Slope: Check electrode for cracks in glass stem or bulb and
replace the electrode.

Slow Response/Excessive Drift: Soak the tip in Hanna Solution
HI7061 for 30 minutes, rinse thoroughly in distilled water and then
follow Cleaning Procedure above.

Each solution is available in M or L size (230 or 460 mL). Electrolyte
Solutions are supplied in kits 4X50 mL.

Check with your nearest Hanna Dealer for more information.

Remove the protective cap. DO
NOT BE ALARMED IF ANY
SALT DEPOSITS ARE
PRESENT. This is normal with
electrodes and they will disap-
pear when rinsed with water.

Shake the electrode down as you
would do with a clinical thermom-
eter to eliminate any air bubbles
inside the glass bulb.

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

If  the fill solution (electrolyte) is
less than 1 cm (½") below the fill
hole, add HI7082 3,5M KCl Elec-
trolyte Solution for double junc-
tion or HI7071 3,5M KCl+AgCl
Electrolyte Solution for single
junction electrodes.

For a faster response lower the rubber sleeve (or unscrew the fill hole
screw).

If the wires are extended, they should not touch (short circuited).
Maximum recommended length  is 15 m (50'), however cables can
be extended.

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

With Process Instrumentation connect the blue wire to the glass
terminal and the white wire to the reference terminal of the meter.

With electrodes terminating in spade lugs, make sure the lugs do not
touch each other otherwise the battery life will be drastically reduced.

PLASTIC BODY

pH ELECTRODE

GLASS BODY

pH ELECTRODE

Fill Hole

Screw

Reference

Fill Hole

Sensitive

Wire

Reference

Wire

Feel Hole

Sleeve Cover

Sensitive

Wire

Reference

Fill Hole

Reference

Fill Hole

Reference

Wire

Reference

Junction

Reference

Junction

Glass Bulb

Glass Bulb

Reference

Wire

Reference

Wire

Sensitive

Wire

Sensitive

Wire

Reference

Junction

Reference

Junction

Platinum or

Gold tip

Platinum or

Gold tip

PLASTIC BODY

ORP ELECTRODE

GLASS BODY

ORP ELECTRODE

2

1

3

4

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