How to use the conductivity meter

How to Use the Conductivity Meter 1. Before turning on the power switch, observe whether the hands indicate zero. If you do not know zero, adjust the screws on the meter to make the hands zero.

2. Place the calibration and measurement switches in the "correction" position.

3. Plug in the power cord, turn on the power switch, and warm up for a few minutes (until the pointer is fully stabilized) Adjust the "adjustment" device so that the meter fullness indication.

4. When using the (1) to (8) ranges to measure liquids with a conductivity below 300, use "Low Week", then turn the plate to "Low Week". When using the range (9)~(12) to measure the liquid with a conductivity of 300 to the range, it will be pulled to "high week".

5. Turn the range selection switch to the required measurement range. If you do not know the measured conductivity of the solution in advance, you should first pull it to the maximum conductivity measurement file, and then step by step to prevent the table from being bent.

6. Measurement readings: The general measurement of its "constant" knob hit 1.0 file, measure the positive adjustment (ADI) to the maximum value, and then slowly adjust the measurement switch to adjust the zero adjustment, Select a range, then turn the measurement switch to the measurement position and read again.

7. Use of the electrode: When using, use the electrode clamp to clamp the bakelite cap of the electrode and fix the electrode on the electrode rod through the electrode clip.

(1) When the conductivity of the tested solution is less than 10, use the DJS-1 type bright electrode. In this case, R should be adjusted to correspond to the constant term of the associated electrode. For example, if the matching electrode constant is 0.95. The R should be adjusted to 0.95. If the constant of the matching electrode is 1.1, R should be adjusted to the position of 1.1.

(2) When the conductivity of the tested solution is in the range of -2, the DJS-1 platinum black electrode is used. With (1) R should be adjusted to the position corresponding to the constant of the mating electrode.

(3) When the conductivity of the test solution is greater than that of the DJS-1 platinum black electrode, the DJS--10 platinum black electrode is used. In this case, R should be adjusted to the position of the constant electrode. For example, if the constant of the electrode is 9.8, R should be set at 0.98. Multiply the measured reading by 10, which is the conductivity of the test solution.

8. Insert the electrode plug into the socket, tighten the fastening screw on the socket, and immerse the electrode in the solution to be tested.

9. Then correct (when using (1) ~ (8) range measurement, the correction in the low cycle. When using the (9) ~ (12) range measurement, the correction to pull the high week), is about to pull the "correction "Adjustment makes the indicator needle full. Note: In order to improve the measurement accuracy, when using “×” and “×”, the calibration must be performed with the conductivity cell connected (the electrode plug is inserted into the socket and the electrode is immersed in the solution to be tested).

10. After that, it will pull to measure, then multiply the indication number by the magnification of the range switch, which is the actual conductivity of the tested liquid. For example, if the value is 0 to 0.1, the pointer indicates 0.6, then the conductivity of the tested liquid is 0.06 (0.6×0.1=0.06). If the pull is 0 to 100, the meter indicates 0.9, then the tested liquid The conductivity is 90 (0.9×100=90), and so on.

11. When using 0~0.1 or 0~0.3 to measure high purity water, first insert the electrode lead into the electrode jack. Before the electrode is not immersed in the solution, adjust to make the meter indicate the minimum value (this minimum value is the electrode Leakage resistance between the platinum sheet, due to the presence of this leakage resistance, makes the meter pointer can not reach zero). Then start measuring.

12. If you want to understand the change of conductance during the measurement process, connect the 10mV output to the automatic potentiometer.

13. Equivalent range switch pulls at "x0.1", pull at low cycle. However, when the conductivity cell socket is not inserted into the electrode, the meter will have an indication. This is a normal phenomenon because the electrode socket and wiring have capacitance. As long as the adjustment: "capacitance compensation" can be adjusted to zero, do not have to do this, just after the electrode lead into the socket, and then adjust the indication to the minimum.

14. When using (1), (3), (5), (7), (9), (11), look at the scale on the surface (0~1.0); when using (2), ( 4), (6), (8), (10) Each file, look at a scale (0~3) below the surface.

Note matters 1. The lead of the electrode must not be wet, otherwise it will not be accurate.

2. High-purity water should be quickly measured after being filled into the container, otherwise the conductivity will decrease rapidly and become carbonate ion due to the dissolved water in the air.

3. The container holding the test solution must be clean and free from ion contamination.