23
ELECT
rODE
Pr
EP
Ar
ATION
9. ELECTRODE PREPARATION
Remove the electrode protective cap. Do not be alarmed if any salt deposits are present. This is normal
with electrodes and they will disappear when rinsed with distilled/deionized water.
During transport, tiny bubbles of air may have formed inside the glass bulb. The electrode cannot
function properly under these conditions. These bubbles can be removed by “shaking down” the
electrode as you would do with a glass thermometer.
If the bulb is dry, soak the electrode in
HI70300
Storage solution for at least one hour.
Preparation of reference electrode:
• Unwrap Parafilm™ seal found over ceramic junction on inner stern of the reference electrode and
discard. This is used for shipping only.
• Rinse inner stern with deionized water, making certain to wet o-ring found on the inner stern.
• Reassemble reference electrode by gently pushing the inner assembly into the outer body (from
the bottom), slide spring and cap down the cable and over the top of the inner stern. Screw the
cap into place.
• Unscrew and remove the fill hole plug and o-ring on fill hole spout.
• Using the dropper pipette provided, add a few drops of
HI7072
fill solution to the electrode. Invert
electrode to wet the o-ring and rinse the electrolyte chamber.
• Holding the body of the electrode gently press the cap with your thumb. This permits the fill solution
to drain out of the body. Release your thumb and verify electrode returns to its original position
(you may need to gently assist for this to occur).
• Fill electrode body with
HI7072
fill solution until solution volume is just below fill hole.
Note:
During measurement always operate reference electrode with the fill hole open.
