ELMETRON CX-401, User Manual

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User‘s manual for CX-401 multifunction meter v6.0x
10. pH MEASUREMENT
Before starting measurement the meter and the pH electrode have to be
prepared for work (chapter 6 and 7 respectively). Good condition of the
electrode is the main condition of correct measurements. If the electrode was
calibrated, choose its number in the meter according to the section 6.4 and
required measurement resolution according to the section 6.2.
10.1. Measurement with automatic temperature compensation
During measurements with automatic temperature compensation, the meter
cooperates with the temperature probe and measures the temperature of the
solution simultaneously with the pH measurement and calculates the
temperature influence to the result.
In case of measurement with automatic temperature compensation:
- turn the meter on by pressing the button;
- using the button choose the pH measurement function;
- join the temperature probe and the combination pH electrode to the pH
and t connectors respectively (Pic. 2), the symbol will be displayed;
- if the electrode was not calibrated or has already been in use for a quite
long period, it is advisable to calibrate it (chapter 8);
- insert the electrode and the temperature probe to the measured solution.
During measurements in vessels do not touch the bottom and the walls
with the electrode. It is advisable to use an electrode stand;
- after the stabilisation read the result.
Accurate laboratory measurements require using of magnetic stirrer.
Note: exceeding the measuring range is signalised blinking digits on the
display. Exceeding the automatic temperature compensation range
is signalised with blinking digits and the symbol.