since the last calibration {TAIL ~ a temperature} measured at {HEAD ~ a predetermined location} of the pick and place system has changed by more than a predetermined value 
since the last calibration { TAIL ~ a temperature } measured at { HEAD ~ a predetermined location } of the pick and place system has changed by more than a predetermined value
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH