PASCO PS-2102 User Manual
®
pH Sensor
1
3
2
to PASPORT
interface
pH electrode
PS-2102
Instruction Sheet
012-07308G
Included Parts
1. pH amplifier
2. pH electrode
3. Storage bottle containing storage solution
Additional Part Required
• PASPORT interface or datalogger
Related Parts
• Replacement electrode (PASCO part 699-195)
• Flat-surface electrode (PS-2182)
• pH buffer set (SC-2321)
Quick Start
1. Connect the amplifier to your PASPORT interface.
2. Connect the pH electrode to the amplifier.
3. If you are using a computer, connect the PASPORT interface
to it and start DataStudio.
Introduction
The pH Sensor measures the pH of a solution. The measurement
is recorded and displayed by the connected computer or datalogger. The pH Sensor is well-suited for continuous recording and
discrete measurements.
Set-up
Connecting the Parts
1. Plug the sensor’s PASPORT connector into any port of a
PASPORT interface or datalogger.
2. Push the connector at the end of the electrode cable onto the
sensor’s electrode connector. Twist the connector to lock it in
place.
4. Remove the storage bottle from the electrode.
5. Rinse the electrode with distilled water.
6. Immerse the end of the electrode in the solution to be mea-
sured.
7. Press or click the start button to begin recording data.
Connecting the electrode and interface
3. If you are using a computer, connect the PASPORT interface
to it and start DataStudio.
®
pH Sensor PS-2102
cap
bottle
Removing
the bottle
Removing the Storage Bottle
1. Hold the electrode vertically so that the solution
will not spill out of the bottle.
2. Unscrew and remove bottle. Keep the storage
solution for later use.
3. Push the bottle cap up the electrode shaft to
keep it out of the way.
Collecting Data
1. Rinse the electrode with distilled water.
2. Immerse the end of the electrode in the solution to be mea-
sured. The bulb-shaped glass membrane should be entirely
immersed.
3. Press or click the start button to begin recording data.
4. Wait for the reading to stabilize.
5. Rinse the electrode again before placing it in another solu-
tion.
Electrode Maintenance
Electrode Storage
For a storage period of a few weeks or less, rinse the electrode
with distilled water and place it in the storage bottle filled with
storage solution. To make storage solution, combine equal parts 4
M potassium chloride (KCl) and pH 4 buffer solution, with a few
drops of pH buffer preservative (buffer preservative is optional).
You may keep the electrode in the storage solution indefinitely,
but for long term storage, PASCO recommends storing the electrode dry. After dry storage, the electrode must be restored (see
below) to rehydrate the glass membrane.
Restoring the Electrode
Follow this procedure to improve the response of a slow electrode or to rehydrate the membrane after dry storage.
1. Clean the membrane using one or more of these methods:
• If the electrode is contaminated with proteins, soak the
electrode in a solution of 1% pepsin in 0.1 Molar hydrochloric acid (HCl).
Calibration
Calibration is not always necessary, especially if you are interesting in measuring a change in pH rather than absolute pH values.
For accurate measurements, first calibrate the sensor. You will
need two different buffer solutions (pH 4 and pH 7 in this example) and distilled water. The solutions should be at the same temperature as the solutions that you will measure later.
The calibration procedure varies depending on which software or
datalogger you are using. For more specific instructions, see the
documentation for your software or datalogger.
1. Open the calibration window or screen. (In DataStudio, click
Setup; then click Calibrate Sensors.)
2. Select the “2 Point” calibration type.
3. Rinse the electrode with distilled water.
4. Place the electrode in pH 4 buffer solution. Wait for the read-
ing to stabilize.
5. Click or select Read for the first calibration point.
• If the electrode is contaminated with inorganic deposits,
rinse the electrode with 0.1 M ethylene dinitric
tetra-acidic acid (EDTA) tetrasodium solution.
• If the electrode is contaminated with oil or grease, wash
the electrode in a mild detergent or solvent known to be
effective for the particular film.
• If the electrode is not responding quickly, soak the electrode alternately in 12 M NaOH (sodium hydroxide) and
1 M HCl (hydrogen chloride). Leave it in each solution
for one minute. Rinse completely between soakings and
end with HCl.
2. Soak the electrode in 0.1 M hydrochloric acid (HCl) for 15
minutes.
3. Soak the electrode in a pH 7 buffer solution for 30 minutes.
If the restoring procedure fails to improve the response of the
electrode, replace the electrode.
Replacement and Alternative Electrodes
• For a replacement electrode, purchase PASCO part 699-195.
6. Remove the electrode from the solution and rinse it with distilled water.
7. Place the electrode in pH 7 buffer solution. Wait for the reading to stabilize.
8. Click or select Read for the second calibration point.
2
• A flat-surface electrode, part PS-2182, is also available.
• The pH Sensor is compatible with other combination pH
electrodes that have BNC connectors.
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