7
AL15
3.2 pH measurement (with ATC , automatic Temperature Compensation)
1) All the procedures are the same as for 3.1 “pH measurement (manual temper-
ature setting)“, except for attachment of a temperature probe by inserting the
plug of the temperature probe into the “Temp. Socket“ (Page 4, Fig. A-13),
and immersing the sensing head of the temperature probe into the measure-
ment solution.
2) The upper display will show the pH value, the bottom left display will show
the Temp. value of the measured solution, and
the bottom right display
will show “Auto Temp.“ as example below:
When not in use the “Electrode Sensing Head“ (Page 6, Fig. B-3) should
always be immersed in water by part-filling the probe cap, (Page 6, Fig.
B-4) and ensuring that the cap is firmly lifted onto the probe. Failure to
do so will reduce probe life.
3.3 mV Measurement
The instrument has a built in mV (millivolt) measurement function, which enables
you to make ion-selective, ORP (oxidation reduction potential), and other precise
mV measurements.
1) Attach the ORP Electrode by installing the “Probe Plug“ of the
ORP electrode
into the “pH Socket/BNC Socket“ (Page 4, Fig. A-16).
2) Power on the meter by pressing the “Power” button once.
3) Keep pressing the “Mode” button until the display at bottom right shows
“PH“ and “Manual Temp.“ indicator.
Press the “Function” button once so that the bottom right display
shows “mV“ .
4) The upper display will show the mV value.
3.4 pH calibration
Calibration - Introduction
An “ideal” pH Electrode generates 0 mV at pH 7.00 (177.4 mV at pH 4). The
meter has been calibrated with signals which simulate the “ideal” pH Electrode
(based on 25°C ambient environment). However not every pH Electrode is as
accurate as the “ideal” one, so calibration procedures are necessary before first
time measurement. In addition to calibration before first time measurement,
users are also recommended to carry out regular calibration to ensure high ac-
curacy measurements.
PH
Auto Temp.
25.0 °C
7.01
