5. Operation
24
Immerse/penetrate probe in the medium to be measured.
- The measured pH and temperature values are displayed. The
readings are updated twice a second.
Hold readings manually:
ON/HOLD
.
Restart measurement:
ON/HOLD
.
- If Auto-Hold is switched on,
AUTO HOLD
flashes until the
instrument has found a stable pH reading. The readings are
then frozen (
AUTO HOLD
lights up). If no stable pH readings
have been found within 300s, the measurement is stopped (
and
AUTO HOLD
light up).
Restart
measurement:
ON/HOLD
.
Finish measurement
1 Switch off instrument: Keep
ON/HOLD
pressed.
2 Clean off the pH probe with low concentration soap water
followed by tap water (water temperature should be below
40 °C). Dab dry with a paper towel. Do not rub.
3 Insert probe in the storage cap filled with electrolyte gel.
The probe tip must be immersed in the electrolyte gel. Keep
electrolyte gel clean.
5.4 Calibrating instrument
Please also adhere to the instructions supplied with the buffer
solution (Testo buffer: see label).
During calibration it is important, that the glass probe does not
touch the synthetic material of the bottle. Preferably do not
leave the instrument in the bottle, as variations in calibrations of
up to ± 0.4 pH can arise.
The instrument is switched on and is in the measurement mode.
1 Open calibration mode:
CAL
.
- Calibration point (4, 7 or 10) is shown and
CAL
flashes.
2 Skip calibration point:
MODE
.
-or-
Immerse probe in the buffer solution and start calibration:
CAL
.
-
The instrument waites for a stable reading:
AUTO
flashes.
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www.
Testo-Direct
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