Download Emerson Fisher 4195K Data Sheet

Product Bulletin
4195K Pressure Controllers
34.5:4195K
July 2014
D200050X012
Figure 3. Schematic of Auto/Manual Station
MANUAL LOADER
AUTOMATIC
POSITION
AUTO/MANUAL
SWITCH
MANUAL
LOADER
KNOB
PLASTIC
TUBE
METAL BALL
OUTPUT PRESSURE
TO FINAL CONTROL
ELEMENT
MANUAL
POSITION
RELAY
RELAY OUTPUT PRESSURE
SUPPLY PRESSURE
MANUAL LOADER OUTPUT PRESSURE
48A5230‐A
A2927‐2
AUTO/MANUAL
SWITCH
SUPPLY
PRESSURE
Anti‐Reset Windup Option
(Suffix Letter F)
OUTPUT PRESSURE
TO FINAL CONTROL ELEMENT
Figure 4. Schematic of External Feedback Option
TO RESET
BELLOWS
Anti‐reset windup is available for all 4195KB and KC
controllers and is designated by the letter F in the type
number. The differential relief valve operates when the
difference between the proportional bellows pressure
and the reset bellows pressure reaches a
predetermined value. Anti‐reset windup reduces
overshoot of the process pressure that can result from
a large or prolonged deviation from set point.
OUTPUT
RESET
VALVE
External Feedback Option
External feedback is available for all 4195KB
controllers. Controllers with this option have an
external connection on the bottom of the controller
case (see figure 6). This connection breaks the positive
feedback (reset) loop inside the controller and brings it
outside (see figure 4).
The connection allows the positive feedback loops of
two controllers (primary and secondary) to be tied
together when the controllers are used in an override
application. When connected, the secondary
controller reset pressure tracks the primary controller
output pressure, minimizing reset windup in the
secondary controller.
TO
NOZZLE
RELAY
TO
PROPORTIONAL
BELLOWS
SUPPLY
PRESSURE
EXTERNAL FEEDBACK TO
OUTPUT OF HIGH OR LOW
SELECT RELAY
NOZZLE PRESSURE
47A0975-A
A3342-1
SUPPLY PRESSURE
RESET PRESSURE
OUTPUT PRESSURE
SELECT RELAY
OUTPUT
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