Data Sheet

www.Fisher.com
Fisherr 4194 Differential Pressure Indicating
Controllers
Fisher 4194 (low pressure) differential pressure
indicating controllers show process differential
pressure and set point on an easy‐to‐read process
scale. The controllers sense two different pressures
and compare the difference between these pressures
with an operator‐adjusted set point. A pneumatic
signal is then delivered to a control element to change
the process differential pressure toward the set point.
The controllers use a capsular element for differential
pressure up to 2.0 bar (30 psi). They are available for
proportional only, proportional‐plus‐reset, and
differential gap control. The controller is also available
(see table 1) with anti‐reset windup, internal
auto/manual station, and remote set point
adjustability (see table 1). 4194 controllers are used in
industry where process monitoring and accurate
measurement of differential pressures are required.
W5850‐1
W5827‐2
SET POINT
ADJUSTMENT
PROCESS
PRESSURE
INDICATOR
OUTPUT
PRESSURE
GAUGE
SUPPLY
PRESSURE
GAUGE
CONTROLLER YOKE‐MOUNTED ON
ACTUATOR OF CONTROL VALVE
INTERIOR OF CONTROLLER
4194 Differential Pressure Controllers
D200048X012
Product Bulletin
34.4:4194
May 2013