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Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. It can be implemented is software if you have an analog input (i.e., open at 1.02 PSI, close at 0.98 PSI) or designed into a switching mechanism. Often the deadband of a switch is fixed and cannot be adjusted. A typical example is in a wall thermostat in your house.
Greg shows how to apply the teflon pipe thread so that it DOES go on easy and in the right direction, and doesn't unravel when you insert the pipe into the recptical. Teflon tape is appropriate for pipe connections where the pipe is tapered.In these types of connections, the pipe threads make the seal.o quote wikipedia.com: Commonly known as  Teflon tape, PTFE tape, tape dope, or  plumber's tape â is a polytetrafluoroethylene (PTFE) film cut to specified widths for use in sealing pipe threads. The tape is wrapped around the exposed threads of a pipe before it is screwed into place.