Electro-Chemical Devices (ECD) L20 - Manual (Page 12)

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.]
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 (-
10.0 to 120.0℃).
2. Press “Mode” key until “pH” icon and “AUTO” icon light
up.
3. Rinse the pH electrode 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 probe.
5. When the “WAIT” icon disappears, the reading is then
“LOCK” and will not respond to further changes from
sample. The pH value shown is the pH value of the sample
at the set sample temperature.
[Note: For samples that are inherently unstable, the
instrument will not AUTOLOCK. In this case, use the pH
NON- AUTOLOCK mode for measurements.]
Measurement with an ATC/Temp probe in the pH NON-
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 light up.
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