LaMotte pH PLUS Direct Meter - Manual (Page 9)

Insert the mini phono jack of the temperature sensor into the socket on the
meter. Unplug the phono jack when not in use or when pH is being measured
without any temperature compensation.
2.7 Condition the pH Electrode
Condition the pH electrode before the first use or if it has not been in use for a
long time by soaking it in a container filled with pH 4 buffer solution for at
least 1 hour. Rinse with tap water before proceeding.
2.8 Switching the Meter On
1. Press the
ON/OFF key to power up the meter. All LCD segments will be
displayed momentarily as the meter performs a self-diagnostic test, as
shown in section 2.2. The meter will be in the Ion measurements mode if
the meter has not been calibrated or reset. The display will show "
---" .
2. Press the
MODE key to choose the desired mode of measurement, The
corresponding annunciator will be displayed on the LCD. In the
temperature mode, the display will show 25°C (factory default), the last
calibrated temperature if there is no temperature probe connected, or the
current measurement value if a temperature probe is connected.
3. The display will show “
Ur” if the measurement is under the minimum
measurement or “
Or” if the measurement is over the maximum
measurement range.
9
Phono jack of
Temperature probe
BNC of pH/ORP
Electrode or ISE