To Next Page

To Previous Page

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

Avoid contamination of standard solution

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

electrode in standard solution before wash the electrode and allow it dry. Please renew conductivity standard

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

solution can affect accuracy.

Due calibration

Pre-set calibration interval (begin from the date of last calibration) to remind

due calibration in a preset period per parameter P2.3 (DC).

During due calibration, Er 7 in red color appears on LCD.

The meter cannot continue operation and Er 7 icon disappears until

the calibration is done, or when select No per parameter P2.3.

Check the calibration date

Check the last calibration date to see whether a new calibration is needed per parameter P2.4.

Conductivity Calibration

example of calibration at 1413μS/cm

Rinse conductivity electrodes in pure water, allow it to dry, wash with a little of standard solution and submerge

it in standard solution. Stir the solution briefly and allow it to stay in the solution until a stable reading is reached.

Press key to enter into the calibration mode. The meter’s display gets blue color and will show blinking “std”

at the top right, and scanning and locking process of calibration solution at the bottom right.

Er 2 appears if press key before the value is stable.

When the meter locks 1413 μS, stability icon displays on LCD. Press key to calibrate the meter. End icon

appears after calibration is done. The meter returns to the measurement mode

and LCD shows icon at the bottom left.

If return from calibration mode without calibration, press key to return to the measurement mode without

calibration.

For multi-point calibration repeat the procedure.

XS Instruments pH 70 Plus User Manual

Questions and Answers: