Thermo Fisher Scientific EcoScan pH/Ion 5 & 6 - Manual (Page 20)

Instruction Manual pH 5/6 & Ion 5/6
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4. MEASUREMENT
4.1 Taking Measurements
1. Before measurement, rinse pH/ORP electrode or Ion Selective Electrode
(ISE) and temperature probe (except Ion 5) thoroughly with tap or distilled
water to remove any impurities stuck onto the bodies of probes.
2. Power on the meter using ON key. Press MODE key to select your desired
mode of operation (pH, mV, Ion or Temperature).
3. Dip and stir both probes gently into an aqueous test sample, swirl gently
and wait for the reading to stabilise. Note the reading. Freeze the displayed
if necessary, for details refer to Section 4.3.
4. Rinse probes with tap water or rinse water thoroughly before taking next
sample measurement or storing them.
4.2 Millivolt (mV) Reference Check (for Ion 5/6 only)
The mV mode in Ion 5/6 is used for the diagnosis of ISE or pH electrode for its
condition. Press the MODE key to access mV mode, the “mV” annunciator in
LCD is displayed. The displayed value shows the absolute mV value of ISE or
pH electrode being measured.
4.3 Holding a Reading
To freeze or hold your displayed reading momentarily, press HOLD key once.
The LCD displays ”HO” annunciator to indicate the HOLD function is activated.
4.4 Releasing a Held Reading
Press HOLD key once again to deactivate the HOLD function or to release your
frozen reading. The meter reverts to current measurement mode, and the “HO”
annunciator disappears from the LCD.