LaMotte pH PLUS Direct Meter - Manual (Page 19)

4. MEASUREMENT
4.1 Taking Measurements
1. Before measurement, rinse the pH/ORP electrode or Ion Selective
Electrode (ISE) and temperature probe thoroughly with tap or distilled
water to remove any impurities on the bodies of probes.
2. Power on the meter using the
ON key. Press the MODE key to select the
desired mode of operation (pH, mV, Ion or Temperature).
3. Dip both probes gently in the test sample, stir gently and wait for the
reading to stabilize. Note the reading. Freeze the displayed reading if
necessary, for details refer to Section 4.3.
4. Rinse the probes with tap water or rinse water thoroughly before taking the
next sample measurement or storing the probes.
4.2 Millivolt (mV) Reference Check
The mV mode is used for the diagnosis of ISE or pH electrode condition. Press
the
MODE key to access the mV mode, the “mV” annunciator is displayed.
The displayed value shows the absolute mV value of the ISE or pH electrode
being measured.
4.3 Holding a Reading
To freeze or hold the displayed reading, press the the
HOLD key once. The
LCD will display the “
HO” annunciator to indicate the HOLD function is
activated.
4.4 Releasing a Held Reading
Press the
HOLD key once again to deactivate the HOLD function or to
release the frozen reading. The meter reverts to the current measurement
mode, and the “
HO” annunciator disappears from the LCD.
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