Thermo Scientific APEX 100 User Manual page 154

Enabling Phase Tracking
To enable phase tracking, do the following.
1) Highlight the phase-tracking function.
Phase Tracking
2) Press the Go button and a check mark appears, verifying phase tracking is now
enabled.
Phase Tracking
3) To set "acceptable change" and "unacceptable change" limits for the phase-tracking
function, see the next two sections.
Page 154 Thermo Scientific APEX User's Guide