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3B SCIENTIFIC PHYSICS U11350 Bedienungsanleitung Seite 5

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4. Technical data
Measurement range:
pH at zero voltage:
Sensor type:
Accuracy:
Resolution:
Reaction time:
5. Operation
Remove storage bottle from the electrode by
twisting off the lid, then pull the lid off the elec-
trode.
Rinse the lower end in the vicinity of the glass
bulb thoroughly with distilled water, shake off
remaining water and dry with filter paper.
Move air bubbles in the lower part of the elec-
trode chamber into the upper part by cautiously
shaking them downward.
Calibrate the electrode. For the procedure, see
section 6 "Calibration".
Subsequently, rinse with distilled water, shake off
remaining water and dry with filter paper.
Conduct measurement.
After finalising the measurement, rinse the elec-
trode with distilled water and repeat the same
procedure as before the measurement.
Slide the lid on the electrode and tighten it to the
storage bottle.
6. Calibration
Connect the electrode to the sensor box, and
connect the sensor box to analog input A of the
TM
3B NETlog
unit, analog input B is suitable for
pH-measurement but not for calibration!
Wait for the "Probe Detect" function to detect the
sensor.
Press the (Date/Time ↵) key 4 times until "User
Calibration" appears in the display.
Start calibration by pressing the (Store ) key.
Immerse the electrode (after rinsing) in the alka-
line "pH 9.00 buffer solution".
Move the decimal points in the display of the (SET
1) with the (Channel
with the (Date/Time ↵) key to the right, respec-
tively.
Increase the displayed value with the (Rate ) key,
or decrease it with the (Store ) key, respectively.
pH 0 to pH 14
pH 7.00 ± 0.25
Ag-AgCl combination elec-
trode,
gel-filled,
refillable
pH 0.05 in the range from
20°C to 25°C
pH 0.01
≤ 1 s for 95% of final value
) key towards the left or
Set the displayed value to +9.000e+00 and press
(Date/Time ↵).
Wait for the correction of the measured value,
press (
(Date/Time ↵) key.
non-
Remove the electrode from the "pH 9.00 buffer
solution", rinse and dry thoroughly, and immerse
in the "pH 4.00 storage solution".
Repeat the procedure described above for (SET 2).
Wait for the "Probe Detect" function to detect the
sensor then conduct the desired measurements.
7. Cleaning the electrode
After prolonged periods of use, clean the elec-
trode for 1 to 2 minutes in dilute hydrochloric
acid HCl (0.1 mol), then rinse with distilled water
and rejuvenate in potassium chloride KCl (4 mol).
Measurement of common household acids and alkalis
Acid-base titrations
Observation of pH changes in chemical reactions
Testing the influence of photosynthesis on water qual-
ity in aquaria
Examining the influence of acid rain and its neutrali-
sation
Water quality of rivers and lakes
9.1 Qualitative determination of the titration
curve of vinegar
Required equipment:
TM
1 3B NETlog
1 pH Sensor
1 Measuring cylinder, 100 ml
Household vinegar pH 2.00
Highly dilute sodium hydroxide pH < 14.00
2
ACCEPT) and validate with the
8. Use in experiments
9. Sample experiment
U11300
U11350
U14205

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