Overview; Getting Started; Replacing Electrodes; Automatic Electrode Recognition - Extech Instruments ExStik PH100 User Manual

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

• Remove the cap from the bottom of the ExStik
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 (PH100 only)
• 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 first use, twist off the battery compartment cap to access the battery. Locate and
remove the plastic battery insulating tab.
• 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

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The ExStik 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. Note that the
PH110 has a refillable electrode and the PH100 does not.
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

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When the ExStik
displays the appropriate unit of measure. Attach electrode before turning the ExStik
Powering the ExStik™
If the batteries are weak, the 'BAT' indicator appears on the LCD. Press the ON/OFF key
to turn the ExStik
automatically after 10 minutes of inactivity to preserve battery life.
is turned on, it recognizes the type of electrode that is connected and
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on or off. The auto power off feature shuts the ExStik
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to expose the electrode glass surface
PH100-PH110 Version 5.0 06/05
3
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on.
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off