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7.3.3 Single point and multi-point calibration

If 1-point calibration is conducted after 3-point or 4-point calibration being done, the previous

calibration values in the same range will be replaced. In the meanwhile, the meter will display the

1-point calibration’s icon, and the other calibration icons will be removed, but the chip will still store

the data from the last calibration. When conducting multi-point calibration, users should follow the

sequence from low conductivity to high in case the high concentration solution contaminating the

low ones.

7.3.4 Reference Temperature

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

from 15˚C to 30˚C. Users can set it up in parameter setting P2.4 (see Section 7.4 for details).

7.3.5 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 – 11 and the data collected during testing. Do the setting in P2.5. (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-11 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

7.3.6 Precaution for calibration solution’s contamination

Conductivity standard solution has no buffer. Please pay attention not to contaminate the solutions

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

standard solution will affect accuracy. Before submerging the electrode in standard solution, please

rinse the electrode with distilled water and allow it to dry.

7.3.7 Calibration Reminder Setup

Preset the interval between calibrations (starting from the time when

you set it), and then the meter will remind you to calibrate at the end of

that interval. For details, please see P2.2 (Section 7.4). When the preset

time is reached, Er6 icon will be displayed at the lower right corner of

Figure-11

Apera Instruments 800 Series User Manual

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