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Table – 9 Temperature compensation coefficient of special solutions

Solution

Temperature compensation coefficient

NaCl solution

2.12%/°C

5% NaOH solution

1.72%/°C

Dilute ammonia solution

1.88%/°C

10% hydrochloric acid solution

1.32%/°C

5% sulfuric acid solution

0.96%/°C

6.2.5 Precaution for calibration solution’s contamination

Conductivity standard solution has no buffer. Please avoid being contaminated during usage. Before

submerging the electrode in standard solution, please rinse the electrode in distilled water and dry it with

clean cloth or tissue paper. Please do not use the same cup of conductivity standard solution repeatedly,

especially for standard solution of low concentration (84μS/cm). The contaminated standard solution will

affect the accuracy.

6.3 Conductivity Calibration

6.3.1. Rinse the electrode in distilled water, allow it to dry, wash with a little of

standard solution and dip it in standard solution. Stir the solution briefly and allow

it to stay in the solution until a stable reading is reached.

6.3.2. Press key to enter the calibration mode.

The meter’s display will show blinking “CAL” at the top right, and scanning and

locking process of calibration solution at the bottom right. When the meter

locks1413 mS, stable icon will display on LCD. Press key to complete

calibration.

The meter will return to measuring mode and is displayed on bottom

left of the LCD screen. See Figure-11.

6.3.3. Notes:

(a) Pressing key before stable icon appeared on LCD screen,

Error indication icon Er 2 will be shown. See Table -11.

(b) Press key before confirmation to exit calibration mode (calibration will not be

completed).

6.3.4. For multi-point calibrations, please repeat the steps in 6.3.1 to 6.3.2 until all calibrations are finished.

The meter can be calibrated in the same calibration solution repeatedly until the reading is stable and

repeatable.

Figure-6

Apera Instruments EC400 User Manual

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