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6.2.2. Calibration intervals

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

(b) Perform calibration once per month.

(25°C), perform calibration per week.

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

(e) For new electrode or factory default setting, perform 3-point or 4-point calibrations. Choose closer

standard solution to the sample solution to perform 1- point or 2-point calibration.

6.2.3. Reference temperature

Reference temperature of factory default is 25°C. Other reference temperature can also be set for range

15°C – 30°C. Select in parameter setting P2.3 and see clause 7.4.

6.2.4. Temperature coefficient

The temperature compensation coefficient of the meter setting is 2.00%/°C. However, the conductivity

temperature coefficient is different for solutions of a different variety and concentration. Please refer to chart

– 10 and the data collected during testing. Set per parameter P2.4. and see clause 7.4.

Notes:

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

measurement value will be based on the current temperature.

Chart – 10 Temperature compensation coefficient of special solutions

Solution

Temperature compensation coefficient

NaCl salt 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. Avoid contamination of standard solution

Conductivity standard solution has no buffer. Please avoid any possible contamination during usage.

Submerge the electrode in standard solution before washing the electrode and allow it dry. Please renew

conductivity standard solution frequently especially for standard solution of low concentration 84 μS/cm. The

contaminated standard solution can affect accuracy.

Apera Instruments PC 8500 User Manual

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