C4 pathway A pathway of carbon fixation, found most commonly in tropical plants that have high rates of growth and photosynthesis and that are adapted to high temperatures, strong light, low carbon dioxide levels, and low water supply. Its importance lies mainly in its reduction of photorespiration.
PT 100 RTD means Resistance temperature detector(RTD) of platinum with 100 ohms resistance at zero degree centigrade.
RE: Heating and cooling time constants of motor and thermal overload protection. Thermal time constant is roughly Tau = Rth*Cth where Rthermal is thermal resistance and Cth is thermal capacity. Cth doesn't change, but Rth is dramatically higher while shutdown while running since there is no cooling air flow.