Hach POLYMETRON 83 series User Manual

Also see for POLYMETRON 8310: User manual User manual User manual User instructions

Hach POLYMETRON 83 series User Manual Manual pdf 10 page image

High conductivity zone: When the measurement frequency is low, the surface of the electrodes willvery quickly saturate and form an insulating layer reducing the flow of current, a phenomenon knownas polarization. Set the frequency to 1 kHz.Note: Select the Auto option to automatically adjust the frequence according to the measurement range.Set the type of temperature compensationThe conductivity of a solution depends both on the concentration and mobility of the ions. Thetemperature of the solution has an influence on these two factors and favors the dissociation of themolecules and therefore the ionic concentration, and increases the mobility.In order to allow the comparison between measurements made at different temperatures, thismeasurement needs to be brought back to a reference temperature (generally 25 °C).On the PROGRAMMING-MEASURE-TEMP.COMP. menu, set the temperature compensation typeaccording to the sample characteristics.Probe calibrationFor detailed information regarding transmitter programming, please refer to the user manualdelivered with the transmitter.Note: It is advisable to calibrate the temperature before the conductivity probe.Temperature calibrationThis is an important step during commission to take into account the cable resistivity and thetemperature compensation.1. Immerse the probe in a solution for about 10 minutes.2. Record the temperature of the solution with a thermometer (precision < ± 0.1°C).3. Program the transmitter in process calibration mode.4. Adjust the value of the temperature read with that of the thermometer.Conductivity calibrationFirst method (recommended)1. Program the transmitter in electric calibration mode. Choose the resistance the closest possibleto your process (see table below).2. First point: Remove the probe from the liquid or unscrew the connector from the probe.3. Second point: Connect the resistance (precision < 0.1 %) of the same value programmed at theIN/OUT terminals of the conductivity module.Conductivity solution:Resistivity solution:0.1 μS.cm-110 MΩ.cm10 μS.cm-10.1 MΩ.cmR connected for K= 0.01 cm-1 100 kΩ 1 kΩR connected for K= 0.1 cm-1 N/A 10 kΩR connected for K= 1 cm-1 N/A 100 kΩConductivity solution:Resistivity solution:1 mS.cm-11 kΩ.cm10 mS.cm-1100 Ω.cmR connected for K= 0.01 cm-1 N/A N/AR connected for K= 0.1 cm-1 100 Ω N/AR connected for K= 1 cm-1 1 kΩ 100 Ω10 English