ELMETRON CX-401, Руководство пользователя

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16. CONDUCTIVITY MEASUREMENT
16.1. Measurement without the temperature compensation
An accurate conductivity measurement should be made without
the temperature compensation. The measured solution should be adjusted to
the reference temperature value introduced earlier, using the temperature
measuring function in the meter. In case of working without the temperature
probe it is necessary to introduce the temperature value with the ,
buttons.
To make measurement:
- connect
the conductivity cell and the temperature probe to
the Cond and t connectors respectively (Pic. 2);
- switch the meter on with the button;
- choose the conductivity measuring mode and the unit (section 13.1);
- if the conductivity cell was not calibrated, calibrate it according to the
chapter 15;
- immerse the conductivity cell and the temperature probe in the standard
solution and hold the conductivity cell at least 1 cm away from the bottom
and walls of the vessel. The measuring cell should be filled up with the
standard solution and should not include any air bubbles, the electrode’s
surface should be evenly moistened*;
- adjust the temperature of the measured solution to the reference
temperature;
- after stabilisation check the reading (Pic. 33).
Pic. 33.
*
- air bubbles may be removed by moving the immersed cell. In order to facilitate moistening of the
electrodes, it is recommended to immerse the cell in distilled water with washing-up liquid, and then
wash it in distilled water.