Keterangan :

The 4150K and 4160K Series controllers, shown in
figure 1, compare a sensed process pressure ( or
differential pressure) with an operator-adjusted set
point, and send a pneumatic signal to an adjacent
control element that maintains the process pressure
at or near the set point value. The 4150K Series
transmitters sense process pressure and send out a
pneumatic signal, usually to an indicating or
recording device that directly indicates the process
pressure.
Unless otherwise noted, all NACE references are to
NACE MR0175 2002.