Manual
9
5.3
mV measurement
The device has an mV (millivolt) measurig function wich allows the user to make ORP and other precise
mV measurement.
To measure the mV value:
1. Switch on the device.
2.
Select the “PH“ measurement mode.
3. Push the control button (6). The display switches from pH to mV (if you push the button again, the .
display switches back from mV to pH).
4. Put the plug of the ORP probe into the BNC socket (16).
5. The display will show the mV value.
5.4
pH calibration
Background:
An ideal pH electrode generates a voltage value of zero millivolts when the pH value is seven. The device
was calibrated with signals which indicate this optimum value at an ambient temperature of 25 °C. Not all
electrodes come up to these optimum values. That is why a calibration must be carried out before first
use. Additionally, occasional calibrations of a used probe makes sense in order to ensure precise
measurements.
For calibration, a pH electrode and a pH standard solution are necessary.
To carry out a pH calibration:
1. Put the plug of the pH probe into the BNC socket (16).
2. Switch on the device.
3 .
Select the “PH“ measurement mode.
4. Adapt the temperature manually to the temperature of the standard solution or put the plug of the
temperature probe into the temperature socket (13). If you want to use the temperature probe, you must
dip it into the the standard solution.
5. Dip the tip oft he pH probe into the standard solution
6. Stir slightly.
7. The display will show the pH value and the set / measured temperature value.
8. Push the REC button and the Hold button at the same time until the following is displayed:
9.Use the arrow buttons to choose one of the following indications:
for calibration by means of a solution with a pH value of 4
for calibration by means of a solution with a pH value of 7