Calibrating Instrument - TESTO 206 Instruction Manual

5.5 Calibrating instrument

Please also adhere to the instructions supplied with the buf-
fer 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 calibra-
tions of up to ± 0.4 pH can arise.
The instrument is switched on and is in the measurement
mode.
1. Open calibration mode:
- testo 206-pH3 with pH probe without temperature sensor:
The set temperature value for manual temperature compen-
sation is displayed for 2s. The value must correspond to the
temperature of the buffer solution.
- Calibration point (4, 7 or 10) is shown and CAL flashes.
2. Skip calibration point:
-or-
Immerse probe in the buffer solution and start calibration:
.
CAL
- The instrument waites for a stable reading : AUTO
flashes.
- If a stable reading is available (change less than 0.02pH
in 20s), the calibration point calibrates and the instru-
ment changes to the next calibration point (if available)
or to the gradient and offset value display.
Carry out calibration manually:
f
3. Repeat Step 2 for additional calibration points.
- Once calibration is complete, the amount of the gradient
and offset value is shown. If the amount of the gradient value
is less than 50mV / pH or the amount of the offset value is
greater than 60mV, the pH electrode is spent and must be
replaced.
4. Return to measurement view:
6. Service and Maintenance
CAL
.
MODE
.
.
CAL
.
CAL
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