Switching The Meter On; Calibration; Ph Calibration - LaMotte pH 5 PLUS Manual

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2.8 Switching the Meter On

1. Press the ON/OFF key. All LCD segments will display
momentarily as the meter performs a self-diagnostic test. The
meter will display - - - if the meter has not been calibrated or if
the meter has been reset.
2. Press the MODE key to choose the desired measurement mode.
3. If a temperature probe is not connected, either 25.0°C (factory
default) or the last calibrated temperature value will be
displayed. If a temperature probe is connected, the current
measured temperature will be displayed.
4. Or (Over range) indicates the reading exceeds the maximum
measurement range.
Ur (Under range) indicates the reading is under the minimum
measurement range (see Section 7 SpeciÞ cations).

3. CALIBRATION

3.1 pH Calibration

The meter is capable of calibrating up to 3 pH values using USA or NIST
(nSt) pH bu er standards or 2 pH values with Low Ionic (Pb) pH bu er
standard. All new calibration values will automatically override existing
data.
USA group
NIST group
Pb group
For the best results perform at least a 2-point calibration at room
temperature (25 °C) using standard bu ers. Begin with pH 7.00 (USA
group), pH 6.86 (NIST group) or pH 6.97 (Pb group).
For a 1-point calibration, the calibration should be performed with a pH
bu er value closest to the expected sample value being measured.
The meter has automatic bu er recognition that identiÞ es the correct pH
bu er values during the calibration. The meter will accept calibration
values that are within ±1.0 pH units of the expected value, otherwise
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