pH Probe
9200001
ReallyEasyData com
Uses
Whether you’re monitoring pH for chemistry, physical science, life science, or earth science activity, this pH meter offers accurate readings
in a convenient format.
Use the RED pH Probe to collect data for:
• pH of solutions
• general solution preparation
• study of biological buffers
• soil analysis
• water analysis
Common National and State Standards That Can Be Taught
With This Data Collector
• Describing and measuring properties of matter
• Identification of acids and bases
• Investigating and measuring changes in or stability of states
of matter
• Characteristics and relationship among air, water, and land
• Atmosphere
• Weather
• Ecosystems
NOTE: This product is to be used for educational purposes only. It is
not intended for medical, industrial, or commercial applications.
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General Procedures
Collect Data in 3 Easy Steps
1
2
3
Use touch screen
commands to select
desired parameters.
Turn the collector on,
it’s ready to use right
out of the box.
Insert the USB drive
and press Play
and Record.
Analyze Data in 3 Easy Steps
1
2
Remove USB from
data collector unit.
3
Place USB drive in
your computer.
Open the .csv file in your
program of choice.
About Plug-in/Excel:
• RED Chart Add In V 1.00 is compatible with
– Windows from XP to 7 and Excel from 2003 to 2007
– Mac OS X 10.2.8 to 10.7 and Excel for Mac from 2004 to 2011
• RED Chart Add In installer can be found in the RED USB thumb
drive included in the package and on the ReallyEasyData.com
website. To install please click on the executable file and follow
the installation wizard instructions.
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Unique Features/Options:
Removable Sensor Tip
• The pH Probe has a removable sensor tip for easy “proper”
storage. The tip can be stored in an upright manner by
removing the sensor tip for the sensor hub, and then stored
upright in a beaker or other vessel that will keep the probe
from tipping.
Help Screen and Error Code
Identification Screen
• The RED USB contains a Help screen file as well as an
Error Code Identification Screen.
To Access the Error Code Identification Screen:
• These screens will assist the user in identifying the error codes
that may appear on the main screen.
• Press the ? on the top of the main screen.
• The error codes will appear.
• By pressing the top or bottom of the screen, the user will be able
to either advance the Error Code Identification Screen page or
return to the previous Error Code Identification Screen page
• If an error code does appear, refer to the RED User Manual for
Corrective Actions to follow.
To Access The Help Screen File:
• These screens will assist the user with the General Operation and
identify the functions of the icons used on the RED probe
– Insert the included RED USB into the USB port on the
RED Data Collector.
– Press the ? on the top of the main screen. The Help Screen
will appear.
– By pressing the top or bottom of the screen, the user will be
able to either advance the Help Screen page or return to the
previous Help Screen page.
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Specifications
• pH Measuring System
Range: pH 0 to 14 pH
Accuracy: ±0.2 pH
Resolution: 0.01 pH
How The Probe Actually Works:
1. A pH electrode: an electrode whose output voltage changes as
the pH (hydrogen ion concentration) changes.
2. A reference electrode: an electrode whose voltage output
stays constant.
3. A pH meter: a mV meter with a special high impedance input
circuit and circuits to change the electrode's millivolts into pH
unit readouts.
How Does a pH Electrode Work?
• Special composition glass senses H+ and a millivoltage is
generated (59.2 mV per pH unit at 25°C).
• A filling solution picks up the signal from the special pH glass.
• A pure silver wire dipped in silver chloride passes the signal
from the solution whose pH is being measured to the electrode’s
cable or connector.
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How Does A Reference Electrode Work?
• A porous reference junction separates the filling solution in the
electrode from the solution whose pH is to be measured.
• The filling solution’s constant chloride ion concentration generates
a millivoltage at a pure silver wire with silver chloride on it.
• The silver wire passes the signal from the solution being
measured to the electrode’s cable or connector.
Calibration Instructions
• Each probe model has a predefined set of calibration values.
No Additional Calibration is Generally Needed
before any measurements are taken.
• User can modify each of these values by feeding the probe with
a reference quantity and inserting the correct measure. The
save function will store the value in flash memory and allow the
user to feed the probe with the next quantity and store the next
value. The cancel function will abort the calibration procedure.
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pH Meter Calibration:
NOTE: ALWAYS RINSE THE PROBE WITH DI WATER IN
BETWEEN EACH MEASUREMENT.
1. ALWAYS start with pH 7 buffer as the first calibration buffer.
2. Use fresh (< 1 week), room temperature buffers. They are
stored in the refrigerator and should be taken out in time to
reach room temperature.
3. Ideally the buffers should be stirred using a stir plate and
magnetic stirrer while they are being measured for calibration.
Otherwise enough time should be allowed to stabilize the
measure (up to 120 sec.)
4. Use the two buffers that bracket the expected range of
measurements. For example, if your samples are expected to
be acidic, use the pH 7 and pH 4 buffers to calibrate. If they are
expected to be basic use the pH 7 and pH 10 buffers.
5. Rinse the electrode and place into the first buffer (pH 7).
6. Press
to enter the calibration setup. Press “–” or “+” to
adjust the calibration point to the value of the used standard.
Allow enough time to stabilize the reading (not shown). Press
the green check
icon to set the value.
7. Rinse the electrode and place into the second buffer. Press “–”
or “+” to adjust the calibration point to the value of the used
standard. Press the green check icon to set the value.
• Save/Abort calibration values
8. Rinse the electrode and place into
sample to be measured.
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Maintenance and Storage
• Be cautious when using RED Probeware in wet environments.
When placed in boiling water, the probe could collect
condensation around the sensor head resulting in damage to
the sensor electronics.
• Proper pH electrode storage will maximize electrode
performance and extends electrode life. pH glass electrodes
need to be kept moist at all times. Fill the protection cap with
the KCl storage solution. Should a ready-to-use storage solution
not be available, it can be prepared dissolving 1 gram of potassium
chloride (KCl) per 200ml of either the phosphate buffer 4 or 7.
Warranty Info:
• Full 3-year warranty on all RED Data Collectors
For further support you can download the
full user’s manual at ReallyEasyData.com
ReallyEasyData
com
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this
device must accept any interference received including
interference that may cause undesired operation.
Exclusively Distributed by:
TM
Natural Science
wardsci.com
800-962-2660
sciencekit.com
800-828-7777
sargentwelch.com
800-727-4368
In Canada:
wardsci.ca
800-387-7822
In Canada:
Boreal/Northwest
boreal.com
800-387-9393
In Canada:
sargentwelch.ca
800-727-4368