User manual

PH100-EU_ENG V2.3 12/08
3
Overview
pH Overview
pH is a unit of measure (ranging from 0 to 14pH) indicating the degree of acidity or
alkalinity of a solution. pH tests are the most commonly performed measurements in water
analysis and reports the negative log of the hydrogen ion activity of a solution which is an
indicator of acidity or alkalinity. Solutions with a pH less than 7 are considered acidic,
solutions with a pH higher than 7 are known as bases, and solutions with a pH of exactly 7
are neutral.
The pH scale is logarithmic so, for example, if sample A is 1 pH less than Sample B, this
means that Sample A is 10 times more acidic then Sample B. A difference of 1 pH
represents a ten-fold difference in acidity.
Getting Started
• For new meters, remove the battery cap and then remove the battery insulating strip.
• Remove the cap from the bottom of the ExStik
TM
to expose the electrode glass surface
and reference junction
• Before first use or after extended storage, soak the electrode (with its cap removed) in a
pH 4 solution for about 10 minutes
• White KCL crystals may be present in the cap. These crystals will dissolve in the soak or
they can be simply rinsed with tap water
• Always calibrate close to the expected measurement value
• Before A sponge is located in the electrode protective cap. Keep this sponge soaked with
a pH 4 solution to preserve Electrode life during storage
Replacing Electrodes
The ExStik
TM
is shipped with an electrode attached. Electrode life is limited and is
dependent on (among other factors) frequency of use and care. If the electrode needs to
be replaced, follow these steps for removing and connecting electrodes.
1. To remove an electrode, unscrew and completely remove the electrode retaining
collar.
2. Gently rock the electrode from side to side, pulling it away from the meter, until it
disconnects.
3. To attach an electrode, carefully plug the electrode into the meter socket (note that
the electrode connector is keyed, ensuring proper connection).
4. Secure the electrode in place by tightly turning the collar in place. (a rubber gasket
seals the electrode with the meter).
Automatic Electrode Recognition
When the ExStik
TM
is turned on, it recognizes the type of electrode that is connected and
displays the appropriate unit of measure. Attach electrode before turning the ExStik
TM
on.
Powering the ExStik™
Press the ON/OFF key to turn the ExStik
TM
on or off. The auto power off feature shuts the
ExStik
TM
off automatically after 10 minutes of inactivity to preserve battery life.