Extech PH100 Operating Manual

User Guide

ExStikTM pH Waterproof Meters

Models PH100 & PH110

Patent Pending

ExStikTM Description

Front Panel Controls

1. Battery compartment cap

2. LCD Display

3. MODE / HOLD button

4. CAL / RECALL button

5. ON/OFF button

6. Electrode collar

7. Electrode (refillable on PH110)
(Electrode cap is not shown)

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Display

1. Bargraph reading

2. Measurement reading

3. BAT (low battery) and
HOLD (data hold) indicators

4. Temperature display

5. Bargraph scale designations

6. Units of measure

7. Calibration indicators

8. RENEW and CAL indicators

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PH100-PH110 V5.1 05/07

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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 ExStikTM 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

• 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 ExStikTM 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

When the ExStikTM 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™

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.

TM

on or off. The auto power off feature shuts the ExStikTM off

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