Mv Measurement; Ph Calibration - Calibration - Introduction - Tintometer Lovibond SensoDirect 150 Mode D'emploi

3. Keep pressing the "Mode" button until the display of bottom right shows "pH" and
"Manual Temp." indicator.
4. Adjust the Manual Temp. value exactly to the same temperature as the solution. For
procedure refer to chapter 7.7.
5. Remove cap and hold the pH Electrode body (Fig. B-2) and completely immerse the
"Sensing Head" (Fig. B-3) in the solution to be measured and gently swirl the probe.
6. The upper display will show the pH value, the bottom left display will show the
Manual Temp. setting.
3.2 pH measurement
(with ATC , automatic Temperature Compensation)
1. All the procedures are the same as for 3.1 "pH measurement (manual temperature
setting)", except for attachment of a temperature probe by inserting the plug of the
temperature probe into the "Temp. Socket" (Fig. A-13), and immersing the sensing
head of the temperature probe into the measurement 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:
25.0 °C
When not in use the "Electrode Sensing Head" (Fig. B-3) should always be im-
mersed in storage solution (3 M KCl) by part-filling the probe cap, (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 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" (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 -
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
26
7.01
PH
Auto Temp.
Calibration - Introduction
SensoDirect 150