YSI 556 MPS - Manual (Page 34)

Sensors Section 4
YSI 556 MPS YSI Incorporated Page 28
Figure 4.4 Sensors Enabled Screen After DO Membrane Selection
NOTE: The Temperature sensor cannot be disabled. Most
other sensors require temperature compensation for accurate
readings. In addition, the conductivity sensor must be
activated in order to obtain accurate dissolved oxygen mg/L
readings.
5. Use the arrow keys to highlight the sensor you want to
change, then press the Enter key to enable or disable it.
6. Repeat step 5 for each sensor you want to change.
7. Press the Escape key to return to the main menu screen.