An optical encoder comprises a sensor head including a light source and a photodetector and a scale that moves relative to the sensor head. A torque converter control module adjusts operation of a torque converter clutch. The latch is moveable between an open position and a closed position. A user index may be used to store data describing attributes of each avatar for analysis using programs stored in memory. Then, during cleaning and sterilization for reuse, the reusable connectors can connect first and second lengths of blood lines together making use of a second sealing surface, in which the first sealing surfaces are exposed to cleaningstoring solution to cause cleaning and antibacterial action on the first sealing surfaces. The method includes conveying a carrier down a borehole penetrating the earth formation, and performing a nuclear magnetic resonance measurement on fluid in the earth formation with an NMR instrument disposed at the carrier to provide total NMR measurement data.