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2.12
Probe Preparation Procedure
16116Install.fm
Note: A "good" membrane will noticeably absorb water like a sponge and change its
color from white to almost clear. This should happen in less than a minute. A "bad"
membrane will remain white.
Warning: Appropriate care should be exercised when performing the following
procedure because the electrolyte contained within the probe is an irritant! To
prevent injury, eye, hand, and body protection should be worn. If skin contact
with the electrolyte occurs, wash thoroughly with soap and water. If eye contact
occurs, immediately flush thoroughly with water for at least 15 minutes.
1. Holding the probe over an appropriate catch basin or sink, remove the
three canister screws and the electrolyte fill screw. Pull the probe body out
of the canister and allow the electrolyte to drain into the basin. Discard the
used electrolyte.
2. Unscrew the membrane holder and discard the membrane originally
provided on the probe.
3. The membranes used on the chlorine probe must be installed with care.
Pay special attention to the following:
•
The membranes are white! The paper used as a spacer is blue or
brown. DO NOT install the spacers.
•
When installing the membrane, it is best to use clean, blunt tweezers
to gently grasp the membrane at the edges only. This avoids
puncturing or soiling the membrane — either of which will render the
probe inoperable.
•
The membrane must be kept wet after removing the probe from the
analyte solution.
4. Place a new membrane into the membrane holder with tweezers and
screw the holder back onto the canister. Be sure that the membrane
O-ring is in place. Tighten the membrane holder only until you feel the
O-ring compress fully.
5. With the canister positioned upright, fill the canister with electrolyte to just
below the fill port on the side of the canister. Tap the canister to dislodge
bubbles.
Warning: When pressing the probe body into the canister, be sure that the
electrolyte fill port is pointed away from yourself and others and covered with a
cloth or paper towel. Press the body into place, expelling any surplus electrolyte
from the fill port.
6. Carefully place the probe body into the canister and prepare to press it
completely into place.
7. Replace the three probe body screws, rotating the body if necessary to
align the holes with the threaded inserts in the canister.
8. Replace the electrolyte fill screw.
9. Being careful not to scratch the membrane tip, place the assembled probe
into a container with approximately 2" of water (tap or distilled).
Section 2
Page 25
Probe Preparation Procedure
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