3B SCIENTIFIC PHYSICS U11350 Bedienungsanleitung Seite 5

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