Electro-Pneumatic Positioner IP5000/5100 Series (SMC)

JIS F8007 IP55

Principle of Operation

IP5100 type IP5100 principle of operation
IP5000 principle of operation
When the input pressure applied to the SIG port of the
positioner increases, bellows q press balance lever w to the
left. As this movement moves flapper r to the left through
connecting spring e, the gap between nozzle t and flapper
r widens, and the nozzle back pressure of pilot valve y
drops. As a result, the pressure balance in the constant
pressure chamber is broken, and exhaust valve !3 presses
inlet valve B !4 to the right, thus opening inlet port B. Then,
output pressure OUT1 rises, and driven diaphragm u moves
downward.