User Manual

Optical pH Sensors | User Manual

3.2 Preparation of Calibration Standards

For the calibration it is strongly recommended to use PyroScience pH buffer capsules

with pH 2 (item no.

PHCAL2) and pH 11 (item no. PHCAL11)

• pH 2 buffer are used for the first calibration point

• pH 11 is used for the second calibration point

For this, open the capsule by holding both ends and pulling them apart. Dissolve the

powder of the capsule in 100 mL demineralized water. Mix well and insure, that the

contents are completely dissolved.

Note: Always prepare a fresh buffer for calibration. The buffers are not

stabilized against microbial growth.

Alternatively, it is possible to perform a Custom Calibration. Prepare a buffer with

known pH value and known ionic strength. For the first calibration point the pH must be

<3 and for the second calibration point the pH must be >10. The respective pH value

and salinity must be entered in the custom calibration menu in the software.

3.3 First Calibration Point (acidic pH)

Ensure that the correct Sensor Code has been entered into the settings and a calibration

standard has been prepared correctly.