1. Power on

1.1 Insert the power cord into the instrument power socket,conductivity meterThe device must have good grounding!

Press the power switch, turn on the power, preheat for 30 minutes, and then perform calibration.

2 Calibration

The instrument must be calibrated before use!

Turn the "Select" switch range selection knob to "Check", the "Constant" compensation adjustment knob to the "1" scale line, and the "Temperature" compensation adjustment knob to the "25" degree line. Adjust the "Calibration" adjustment knob to display 100.0 μ S/cm on the instrument, and the calibration is complete.

3 Measurements

3.1 In the process of conductivity measurement, it is very important to correctly select the conductivity electrode constant to achieve high measurement accuracy. Four different types of conductive electrodes with constants of 0.01, 0.1, 1.0, and 10 can be used. Users should select the corresponding constant conductivity electrode based on the measurement range and refer to Table 1.

Table 1

Measurement range (μ S/cm): It is recommended to use electrodes with conductivity constant

0～2 0.01，0.1

2～200 0.1，1.0

200～2000 1.0

2000～20000 1.0，10

20000～200000 10

Note: For conductivity electrodes with constants of 1.0 and 10, there are two forms: "bright" and "platinum black". Platinum plated electrodes are commonly referred to as platinum black electrodes, and the measurement range for bright electrodes is preferably (0-300) μ S/cm.

The method for setting the electrode constant is as follows:

At present, the electrode constants of conductive electrodes are four different types: 0.01, 0.1, 1.0, and 10. However, the electrode constant values of each type of electrode are pasted on each conductive electrode by the manufacturer, and the instrument panel "constant" compensation adjustment knob is adjusted to the corresponding position according to the electrode constant value marked on the electrode.

3.2.1 Turn the range selection switch knob to "check", the "temperature" compensation adjustment knob to the "25" degree line, and adjust the "calibration" adjustment knob to display 100.0 μ S/cm on the instrument.

3.2.2 Adjust the "constant" compensation adjustment knob to make the instrument display value consistent with the value marked on the electrode.

3.2.2.1 If the electrode constant is 0.01025cm-1, adjust the constant compensation adjustment knob to display a value of 102.5 on the instrument. (Measurement value=Reading value x 0.01).

3.2.2.2 If the electrode constant is 0.01025cm-1, adjust the constant compensation adjustment knob to make the instrument display 102.5. (Measured value reading multiplied by 0.1).

3.2.2.3 If the electrode constant is 1.025cm-1, adjust the constant compensation adjustment knob to make the instrument display 102.5. (Measurement value=reading value x 1).

3.2.2.4 If the electrode constant is 10.25cm-1, adjust the constant compensation adjustment knob to make the instrument display 102.5. (Measurement value=Reading value x 10).

3.3 Temperature compensation settings

3.3.1 Adjust the "temperature" compensation adjustment knob on the instrument panel to point towards the actual temperature value of the test solution. At this point, the measured value will be the conductivity value of the test solution converted to 25 ℃ after temperature compensation;

If the "temperature" compensation adjustment knob is pointed to the "25" scale line, the measured value will be the original conductivity value of the test solution at that temperature without compensation.

After setting the constant and temperature compensation, the range selection switch knob should be adjusted to the appropriate position according to Table 2. When the displayed value goes out during the measurement process, it indicates that the measured value exceeds the range. At this time, the range selection switch knob should be switched to the upper range.

Table 2

Number selection switch position range (μ S/cm) measured conductivity (μ S/cm)

1 Ⅰ 0~20.0 display reading x C

2 Ⅱ 20.0-200.0 display reading x C

3 Ⅲ 200.0~2000 display reading x C

4 Ⅳ 2000~20000 display reading x C

Note: C is the constant value of the conductive electrode

Example: When the electrode constant is 0.01, C=0.01；

When the electrode constant is 0.1, C=0.1；

When the electrode constant is 1.0, C=1.0；

When the electrode constant is 10, C=10；

4 Precautions

4.1 When measuring high-purity water, contamination should be avoided and a sealed and flowing measurement method should be used.

4.2 As the temperature compensation system adopts a fixed 2% temperature coefficient compensation, it is recommended to use a non compensation method for measuring high-purity water and refer to the table.

4.3 To ensure measurement accuracy, the electrode should be rinsed twice with distilled water (or deionized water) of less than 0.5 μ S/cm before use, and then rinsed three times with the test sample before measurement.

4.4 The electrode plug socket should be protected from moisture to prevent unnecessary measurement errors.

4.5 The electrode should undergo regular constant calibration.