Use of Conductivity Meter Electrodes

　　① When the conductivity of the melt to be measured is lower than 0.3 ns·cm 1, use DJS O.1 measuring electrode. At this time, RP2 should be adjusted to 10 times the electrode constant of the matching electrode. For example, if the matching electrode constant is 0.090, RP2 should be adjusted to 0.90.

　　② When the conductivity of the melt to be measured is lower than 10p,s·cm 1, use DJS-type bright electrode. At this time, RW should be adjusted to the position corresponding to the constant of the matching electrode. For example, if the constant of the matching electrode is 0.95, RP2 should be adjusted to 0.95. If the constant of the matching electrode is 1.1, the two sections of RP2 should be at the position of 1.1.

　　③ When the conductivity of the solution to be measured is in the range of 10 to 104 μS·cm-1, use the DJS-1 platinum black electrode and adjust fiP2 to a position corresponding to the constant of the matching electrode.

　　④ When the conductivity of the measured melt is greater than 104μS·cm-1, use the DJS-10 platinum black electrode. At this time, RP2 should be adjusted to 1/10 of the constant of the matching motor. For example, if the constant of the electrode is 9.8, RP2 should be adjusted to 0.98, and then the measured reading should be multiplied by 10, which is the conductivity of the measured melt.

　　2) Insert the electrode plug into the electrode socket, tighten the fastening screw on the socket, and then immerse the electrode in the melt to be tested.

　　3) Then calibrate (when measuring with range 1 to 8, the high/low frequency switch 8 is turned to low frequency during calibration, and when measuring without range 9 to 12, the high/low frequency switch 8 is turned to high frequency during calibration), that is, turn the calibration/measurement switch 7 to "calibration" and adjust RP2 to make the indication at full scale. Note: In order to improve the measurement accuracy, when using the two gears of to' pS·cm～1 and to' pS·cm l, the calibration must be carried out with the conductivity cell properly connected (the electrode plug is inserted into the jack and the electrode is immersed in the solution to be measured).

　　4) Then, turn the calibration/measurement switch 7 to the measurement position. At this time, the indicated value multiplied by the magnification of the range selection switch is the actual conductivity of the measured liquid. For example, if the range selection switch is in the position of (0～0/1)μS·cm-1, the pointer indicates 0.6, then the conductivity of the measured liquid is 0.06μS·cm 1 (0.6×0.1μS·cm 1＝0.06pS·cm-1); for another example, if the range selection switch is in the position of 0～100μS·cm-1, the meter indicates 0.9, then the conductivity of the measured liquid is 90pS·cm 1 (0.9×100μS·cm l＝90pS·-1cm), and so on.

　　5) When measuring high purity water using the (0～0.1·) or (0～0.3) pS·cm 1 range, first insert the electrode lead into

　　Figure 1 The appearance of the conductivity meter
　　1 - electrode constant compensation regulator 2 - 10mV output socket
　　3 - electrode socket 4 - capacitance compensation regulator
　　5 - constant selection switch 6 - calibration regulator
　　7 - calibration/measurement switch 8 - high/low frequency switch
　　9 - power indicator light 10 - power switch

　　Before the electrode is immersed in the solution, adjust RP1 to make the meter indicate the minimum value (this minimum value is the leakage resistance between the electrode platinum sheets. Due to the existence of leakage resistance, the meter pointer cannot reach zero when adjusting RP2), and then start the investigation.

　　6) If you want to know the change of conductivity during the measurement process, just output 10mV to the automatic recorder.

　　7) When the range selection switch is at "×0.1" and the high/low frequency switch is at low frequency, but the conductivity cell plug is not plugged into the electrode, the meter will indicate. This is normal because the electrode plug is wired with capacitance. As long as the "capacitance compensation" is adjusted, the indication can be adjusted to zero, but it is not necessary to do so. You must insert the electrode lead into the plug and then adjust the indication to the minimum value.

　　8) When using the 1, 3, 5, 7, 9, and 11 ranges, look at the scale on the upper surface (0-1.0); and when using the 2, 4, 5, 8, and 10 ranges, look at the scale on the lower surface (0-3).