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Fisher™ 4194 Differential Pressure Controller
Fisher 4194 Controller
Fisher 4194 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. They are available for proportional only, proportional-plus-reset, and differential gap control. The controller is also available with anti-reset windup, internal auto/manual station, and remote set point adjustability. 4194 controllers are used in industries where process monitoring and accurate measurement of differential pressures are required.
Fisher™ 4194 Differential Pressure Controller


Area Classification
On/Off, Modulating Control
Input Signal
Max Outlet Pressure
40 psig
Mounting Type
Remote Mount, Actuator Mount
Operating Temperature
Standard Temperature
Position Control
On/Off, Modulating Control
Process Control
Supply Media
Air, Natural Gas
Other Configurations
Contact your local Emerson business partner or sales office to learn about additional specifications or options for this product.


  • Simple design of the controller allows fast, easy maintenance and minimal spare parts inventory.
  • Adjusting the set point and the zero and span of the process pointer and switching between direct and reverse action are accomplished quickly and without special tools.
  • Simple design and low mass of internal parts allow the controller to withstand vibration encountered in most plant environments.
  • Relay and nozzle design reduces steady-state air consumption to as low as 0.09 normal m3/hr (5 scfh).
  • Tough plastic housing resists corrosive environments. Internal constructions are available to resist a corrosive supply pressure media.
  • The controller can mount directly on the actuator or it can mount on a pipestand, on a wall, or in a panel.
  • Two red pointers on a 114 mm (4 1/2 in) long white-on-black scale show differential pressure and deviation from set point at a glance. Two other gauges monitor supply and output pressures.