35
Press
LOG
to memorize the current reading. A message indicating the free log space will be
displayed for a few seconds.
In order to take pH measurements follow the next steps:
• Submerge the pH bulb 2 cm (0,8’’) and the temperature probe into the sample to be tested
and stir gently. Allow time for the electrode to stabilize. When the reading becomes stable
the (unstable measurement) symbol will disappear.
• If the pH readings are less than -2.00 or greater than 16.00 pH the closest full-scale
value (-2.00 pH or 16.00 pH) will be displayed blinking.
If measurements are taken successively in different samples, it is recommended to rinse the
electrodes thoroughly with deionized water or distilled water and then with some of the next
sample to prevent cross-contamination.
pH measurements are affected by temperature. In order to have accurate pH measurements, the
temperature effect must be compensated for. To use the Automatic Temperature Compensation
(
ATC
) feature, connect and submerge the
HI 7662-M
temperature probe into the sample in the
dedicated guide tube and wait for a few seconds. The
“ATC”
message will be shown on the
display. Automatic Temperature Compensation will provide pH corrected values at the temperature
of measurements. If Manual Temperature Compensation (
MTC
) is desired, the temperature probe
must be disconnected from the instrument. The default temperature of 25 °C (77 °F) or the last
temperature reading will be displayed preceded by the symbol and the
“MTC”
message.
The manually set temperature can now be adjusted with the
ARROW
keys (from -20.0 to 120.0 °C).