Ph Measurements; Atc/Temp Probe, Ph Autolock Mode; Manual Temperature Compensation, Ph-Autolock Mode - ECD L20 Instruction Manual

C. pH Measurements
To take pH measurements, the pre-selected buffer solution set must lit
up, indicating the unit is Single point or dual-point or three-point
calibrated and ready for measurements. If buffer solution set flashes,
perform a pH calibration before taking measurements.
a. Measurement with an ATC/Temp probe in the pH AUTOLOCK
mode
1. Connect the pH electrode to the BNC connector and the ATC/Temp
probe to the ATC/Temp connector of the unit. The "ATC" icon will
light up.
2. Press "Mode" key until "pH" icon and "AUTO" icon light up.
3. Rinse the pH electrode and ATC/temp probe with distilled water and
immerse in the sample to be measured. Remove any air bubbles
trapped around the probe by shaking or stirring the probe.
4. Press the "Mea." key. The "WAIT" icon will start flashing. The unit is
waiting for a stable reading. The display will track the pH value as
sensed by the pH electrode and the ATC/Temp probe.
5. When the "WAIT" icon disappears, the reading is then "LOCK" and
will not respond to further changes from the sample. The pH value
shown is the pH value of the sample at the displayed sample
temperature.
[Note: For samples that are inherently unstable, the unit will not
AUTOLOCK. In these cases, use the pH NON- AUTOLOCK mode for
measurements.]
b. Measurement with manual temperature compensation in the pH-
AUTOLOCK mode
1. Connect the pH electrode to the BNC connector of the unit. The
"MAN" icon will lit up. Set unit to display the sample temperature
by pressing the up and down keys (0.0 to 100℃).
2. Repeat steps 2~5 of "Measurement with an ATC/Temp probe in the
pH- AUTOLOCK mode".
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