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2 GENERAL INFORMATION
2.1 Requirements
The following will be required in addition to the
probe:
a)
An expanded scale pH meter, such as ABB
Model 7046 (which has a direct reading
concentration scale).
b)
Standard solutions of an ammonium salt.
c)
Alkaline buffer solution (see Section 3).
d)
Magnetic stirrer.
2.2 Accessory Equipment
Note.
See
accessories.
Flow-through cap, Part No. 8002-830. This item
is supplied with the kit. It allows samples to be
pumped directly onto the sensing membrane of
the probe. A simple closed flow system may be
constructed using the cap. Further details are
given in Section 3.
2.3 Probe Assembly Instructions
The probe takes only a few minutes to
assemble, but for the best results the
instructions must be followed carefully.
a)
Unscrew the end cap from the probe body.
Rinse out the probe body with distilled or
deionised water and allow to drain.
b)
Remove the teat from the glass electrode and
rinse the electrode with distilled or deionised
water. Dry with a paper tissue.
c)
Insert the glass electrode into the body and
screw it in until the top of the electrode is flush
with the end face of the probe. Note the
number on the electrode cap in line with the
mark on the probe body. Unscrew the
electrode cap four full turns.
list
of
spares
and
d)
Take one of the washers and a membrane
from the spares kit. Carefully peel off the
backing material from the membrane. Drop
the washer into the end cap, then place the
membrane on to the washer.
e)
Screw the end cap firmly onto the body: both
the body seal and the membrane sealing
washer should be under compression. The
end cap should not be screwed on so tightly
that the membrane wrinkles.
f)
Hold the probe upright and fill the probe
through the filling hole with the internal filling
solution provided until there is a 50 to 60mm
depth of solution inside. Wipe any excess
filling solution from the body.
g)
Tap the end of the probe with a finger to
dislodge any air bubbles which may have
become trapped between the end of the
glass electrode and the membrane. Then
screw the glass electrode down four turns to
the flush position again and then a further
1
to
/
turn. The tip of the electrode will now be
2
pressing against the membrane. In some
circumstances, particularly if the electrode
response is found to be unusually slow, the
screw may be given a further
Note. Screwing the electrode down too
far may puncture the membrane.
h)
Push the probe cap onto the top of the
probe body.
1
/
3
1
/
turn.
4
3
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