YSI YSI 556 MPS, Set-Up, Operation & Calibration

Page: 29 / 68

pH
•
Use the arrow keys to highlight the pH selection.
•
Press Enter . The pH calibration screen is
displayed.
– Select the
1-point option only if you are
adjusting a previous calibration.
– Select the
2-point option to calibrate the pH
sensor using only two calibration standards.
Use this option if the media being monitored
is known to be either basic or acidic.
– Select the
3-point option to calibrate the pH
sensor using three calibration solutions. In
this procedure, the pH sensor is calibrated
with a pH 7 buffer and two additional buffers.
The 3-point calibration method assures
maximum accuracy when the pH of the
media to be monitored cannot be
anticipated.