Extech Instruments ExStik PH100 User manual

USER MANUAL
ExStikTM Waterproof pH Meters
Models PH100 and PH110
Additional User Manual Translations available at www.extech.com

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Introduction
Thank you for selecting the Extech Model PH100 and/or the model PH110 (refillable) meter. This
instrument is designed for high accuracy pH testing. This device is shipped fully tested and, with
proper use, will provide years of reliable service. Please visit our website (www.extech.com) to check
for the latest version and translations of this User Manual and Customer Support.
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
(Protective Electrode cap with sponge is not shown)
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
CAUTIONS
•The pH membrane is made of special pH glass. This is somewhat fragile. Do not touch the
membrane or press this onto a hard surface. This meter is for measuring pH in a liquid
solution.
•If testing food, test a sample only and then discard the sample, do not place this meter directly
into the product. Test the surface of the sample and do not press into the sample.
•This meter is not for use on concrete.
•In case the device is going to be unused for an extended period of time, remove the batteries
to prevent them from draining or leaking.

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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
•For new meters, remove the battery cap and then remove the battery insulating strip.
•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.
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 ExStikTM on.
Powering the ExStik™
If the batteries are weak, the ‘BAT’ indicator appears on the LCD. Press the ON/OFF key to turn the
ExStikTM on or off. The auto power off feature shuts the ExStikTM off automatically after 10 minutes
of inactivity to preserve battery life.

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Operation
Overview
When the electrode is placed in a solution, the main display and bargraph indicate the pH reading
while the lower display reads temperature (readings flash until they have stabilized). The bargraph
is ‘center zero’, i.e. at pH 7 there is no display. As the pH rises, the bar moves from the center to the
right. If the pH drops, the bar moves from the center to the left.
pH Calibration (1, 2, or 3 points)
A two point calibration with a buffer of 7 plus 4 or 10 (whichever is nearest to the expected sample
value) is always recommended. A one point calibration (choose the value closest to the expected
sample value) is also valid. For best accuracy, calibrate at the sample temperature.
1. Place the electrode into a buffer solution (4, 7, or 10) and short press the CAL key. pH 7
should be calibrated first, then 4 and/or 10 pH.
2. The ExStikTM automatically recognizes the solution and calibrates itself to that value. Note: If
the solution is more than 1pH off from the 4, 7, or 10pH standard, the ExStikTM will assume an
error and abort the calibration. CAL and END will be displayed.
3. During calibration, the pH reading flashes on the main display.
4. When calibration is complete, the ExStikTM automatically displays ‘END’ and returns to normal
operation mode.
5. The appropriate circled indicator ➃,➆, or ➉will appear on the LCD when a calibration has
been completed. The calibration data is stored until a new calibration is performed.
6. For a two or three point calibration, repeat steps 1-4.
Note: Always turn the meter off and then on before calibrating to allow sufficient time to complete
the calibrations during one power cycle. If the meter auto powers off during calibration the
calibrations remain valid, but new calibrations will turn the circled indicators off.
Note: The Automatic Temperature Compensation (ATC) circuit is not active during calibration. To
ensure a more accurate calibration, make sure that the calibration buffers are at 25°C (77°F).
RESET
If the meter will not calibrate or displays a -1, reset the meter and attempt to re-calibrate.
1. Turn off the meter.
2. Remove the battery cartridge from the top of the meter.
3. Press the On/Off button for 10 seconds to bleed off all charges within the meter.
4. Re-insert the batteries and power on the meter.
5. Attempt to re-calibrate the meter.
Changing the Displayed Temperature Units
Press and hold the CAL button for approx. 3 seconds. The oC or oF icon will change first and the
numerical temperature value will change after the button is released. If the Calibration mode is
accidentally accessed ‘CAL’ appears on the LCD. Simply turn the ExStikTM off and start again.
Data Hold
Short press the MODE button to freeze the current reading. The HOLD display icon will appear
along with the held reading. The held reading will also be stored in memory. Short press the MODE
key to return to normal operation.

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15-Storing Readings into Memory
1. Short press the MODE button to store a reading. The
LCD will briefly display the memory location number
and then the value stored (Data Hold will activate).
2. Short press MODE again to return to normal operation.
3. Repeat step 1 to store the next reading and so on.
4. After 15 readings are stored the ExStikTM will return to
memory location 1 and start overwriting existing data
with newly stored data.
Recalling Stored Readings
Note: Check that the HOLD symbol is not displayed. If it is, exit the HOLD function by short pressing
the MODE button.
1. Short press the CAL button and then press the MODE button immediately after CAL is
displayed; the storage location number (1 through 15) will flash. If the CAL mode is
accidentally accessed (display flashing), press the CAL button again to exit.
2. The last reading stored will be displayed first. To advance through the stored readings, short
press the MODE button. The location number is displayed first, followed by the reading stored
in that location.
3. To exit the recall mode, short press the CAL button and the ExStikTM will return to normal
operation.
CAL Reminder Display
When the ExStikTM is turned on in the pH mode for the 15th time without recalibration, the ‘CAL’ icon
appears on the LCD indicating that the ExStikTM may require calibration. Some applications may
require recalibration of the electrode more frequently than others. The CAL display is simply a
reminder and will turn off when the pH electrode is recalibrated.
RENEW Display
A flashing ‘RENEW’ warning indicates that the probe may be nearing the end of its useful life. If
cleaning or recalibration does not cause the RENEW icon to disappear, replace the electrode. The
RENEW display appears when the output of the pH electrode fails a diagnostic test.
Making a Measurement
Place the calibrated pH meter into a sample of your solution.
The display will flash while the meter is making the measurement. When the display stops flashing
the measured pH value is displayed. It may take 10 to 15 seconds more to stabilize.
Note: If the display does not stop flashing, the meter or electrode is defective.
Considerations
•If the unit appears to be locked (display frozen) it is possible that the Data Hold mode has been
inadvertently accessed by pressing the MODE button. Simply press the MODE button again or
turn the meter off and restart if the display appears frozen.
•If the meter does latch up and no button presses revive it, remove the batteries, push the ON
button for 10 seconds and then reinsert the batteries.
•Note that if the batteries are removed, any stored readings will be discarded. Also, the user
calibration data for pH will be cleared. Factory calibration data for all models will be retained,
however.

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Battery Replacement
1. Twist off the battery compartment cap
2. Replace the four (4) 2032 batteries observing polarity.
3. Replace the battery compartment cap
Safety: Please dispose of batteries responsibly; never dispose of batteries in a fire, batteries may
explode or leak. If the meter is not to be used for 60 days or more, remove the battery and store
separately.
pH Electrode Refilling (pH110/115 refillable electrode only)
The refillable electrode does not need to be detached from the body of the
ExStikTM in order to perform the refilling procedure. Refillable electrodes
(PH115) have a removable reference junction (slotted) and the word
REFILLABLE on the side of the electrode housing.
Removing the Reference Junction
The removal tool supplied with the PH113
Refill Kit is used to remove the reference
junction screw from the sensing surface of
the electrode. If the reference junction does
not have slots for the ‘teeth’ of the removal
tool to lock onto, the electrode is NOT
refillable.
Holding the electrode upside down, unscrew
and remove the reference junction using the removal tool.
Filling the Electrode
1. Once the reference junction is removed, gently shake out all of the older refill solution
from the electrode.
2. Fill the electrode cavity completely with the refill solution supplied in the Refill Kit.
3. Replace the reference junction using the removal/installation tool. (Spare junctions are provided
if needed).
Filling Solution
The supplied container includes 15ml of filling solution. There is enough solution for 4 to 5 refills.
Use only the supplied solution for refilling the electrode.

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Specifications
Display Multifunction LCD with Bargraph
Operating conditions 32 to 122oF (0 to 50oC) / < 80% RH
Range and Accuracy 0.00 to 14.00 / ± 0.01pH typical
Temp. Compensation Automatic from 32 to 194oF (0 to 90oC)
Temperature Range 23 to 194oF (-5 to 90oC)
Temperature Resolution 0.1oup to 99.9 then 1othereafter
Temperature Accuracy ± 1oC/1.8oF [from -5 to 50oC (23 to 122oF)]
± 3oC/5.4oF [from 50 to 90oC (122 to 194oF)]
Measurement storage 15 tagged (numbered) readings
Power Four (4) CR2032 button batteries
Low battery indication ‘BAT’ appears on the LCD
Auto power off After 10 minutes of inactivity
Dimensions 1.4x6.8x1.6”(35.6x172.7x40.6mm); 3.85oz (110g)
Optional Accessories
•Tripak buffers with 4, 7 & 10 pH capsules (6 each) plus two rinsing solutions (Part Number:
PH103)
•pH 4.01 buffer, pint, (Part Number PH4-P)
•pH 7.00 buffer, pint, (Part Number PH7-P)
•pH 10.00 buffer, pint, (Part Number PH10-P)
•Spare pH Electrode –non-refillable (Part Number: PH105)
•Spare pH Electrode - refillable (Part number PH115)
•Electrode Refill solution (Part number PH113)
•Spare ORP electrode (Part Number: RE305)
•Spare Chlorine electrode (Part Number: CL205)
•Weighted base with 5 solution cups (Part Number: EX006)
Note: If the unit is to be converted for ORP or Chlorine use by attaching the proper electrode,
please visit www.extech.com to download the proper User Guide

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Two-year Warranty
Teledyne FLIR LLC warrants this Extech brand instrument to be free of defects in parts and
workmanship for two years from date of shipment (a six-month limited warranty applies to sensors
and cables). To view the full warranty text please visit:
http://www.extech.com/support/warranties.
Calibration and Repair Services
Teledyne FLIR LLC offers calibration and repair services for the Extech brand products we sell. We
offer NIST traceable calibration for most of our products. Contact us for information on calibration
and repair availability, refer to the contact information below. Annual calibrations should be
performed to verify meter performance and accuracy. Product specifications are subject to change
without notice. Please visit our website for the most up-to-date product information:
www.extech.com.
Contact Customer Support
Customer Support Telephone List: https://support.flir.com/contact
Calibration, Repair, and Returns: [email protected]
Technical Support: https://support.flir.com
Copyright ©2021 Teledyne FLIR LLC
All rights reserved including the right of reproduction in whole or in part in any form
www.extech.com