User Manual

- 14 -

Table-8 Conductivity Calibration Solutions

Calibration Icons

Calibration Solutions

84 μS/cm

1413 μS/cm

12.88 mS/cm

111.8 mS/cm

6.2.2. How often to calibrate

(a) The meter has been calibrated before leaving the factory and can generally be used right out of the box.

(b) Normally perform calibration once per month.

calibration once per week.

(d) Use conductivity standard solution to check whether there is error. Perform calibration if error is large.

(e) For new electrode or the meter has been set to factory default, perform 3-point or 4-point calibration. For general

use, choose standard solutions that are closer to the sample solution to perform 1-point or 2-point calibration.

6.2.3. Reference Temperature

The factory default setting for reference temperature is 25℃. The reference temperature can be set from 15℃ to

30℃. Users can set it up in parameter setting P2.2 (see Section 7.4 for details).

6.2.4. Temperature compensation coefficient

The temperature compensation coefficient of the meter setting is 2.0%/°C. However, the conductivity temperature

coefficient is different from solutions and concentration. Please refer to Table – 9 and the data collected during testing.

Do the setting in P2.3. (see section 7.4 for more).

Note: When the coefficient for the temperature compensation is set to 0.00 (no compensation), the

measurement value will be based on the current temperature.

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.