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Pneumatic Pressure Controllers

Once again Emerson Process Management reinforces its long-standing commitment to technological excellence with a complete line of pressure controllers. Simplicity…ruggedness…reliability  – these are the qualities that have made Fisher® products the industry standard in pressure control. These pneumatic pressure controllers bring you economical and accurate control whether the process variable is differential pressure (at either low or high static pressures) or gauge pressure. Their simple, yet rugged construction pays off in long, reliable service under difficult operating conditions.

Differential Pressure Controller: Fisher® 4194 Series
Differential pressure controllers use either a bellows or a capsular element for sensing two different pressures. The difference between these pressures is then compared to an operator-adjusted set point. The controller then delivers a pneumatic signal to a control element to change the differential pressure toward the set point. For high static pressures, an externally mounted differential pressure unit (such as a Barton 199) is used to sense the differential pressure. Gauge pressure controllers use a bellows, capsular element, or Bourdon tube to sense a vacuum, compound, or positive pressure. These controllers are available as one (proportional only), two (proportional-plus-reset), or three (proportional-plus-reset-plus-rate) mode controllers, or differential-gap. Anti-reset windup is also available for two and three mode controllers.

Differential Pressure - Pneumatic Pressure CotnrolFisher® 4194 Series 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 with anti-reset windup, internal auto/manual station, and remote set point adjustability.

Instruction Manuals: 4194S Series Differential Pressure Controllers
4194HA, HB, and HC Series Differential Pressure Controllers
Product Bulletins: 4194S Series Differential Pressure Controllers
4194H Series Differential Pressure Controllers
Energy Responsible Controller: Fisher® C1 Controller
Fisher® products compare 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.

Energy Responsible Controller - Pneumatic Pressure ControllersFisher® C1 energy responsible controllers and transmitters continue the tradition of durable and dependable Fisher pressure instrumentation while addressing air/gas consumption concerns. The C1 Series is used wherever durable and dependable pressure instrumentation is required. The use of this product in demanding applications, such as those found in chemical process, gas, and oil production industries, demonstrates its versatility. The new design can reduce steady-state air/gas consumption to as little as 1/10th that of previous products.

C1 Series controllers compare 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. C1 Series transmitters sense process variables and send out a pneumatic signal, usually to an indicating or recording device that directly indicates the process measurement. Sour gas service capability: NACE-MRO175-2002.

Instruction Manuals: Fisher C1 Pneumatic Controllers and Transmitters
Product Bulletins: Fisher C1 Pneumatic Controllers and Transmitters
Gauge Pressure: Fisher® 4195K Series Controllers
Gauge pressure controllers measure the difference between the absolute pressure and the local atmospheric pressure.

Gauge Pressure - Pneumatic Pressure ControlFisher® 4195K Series gauge pressure indicating controllers show process pressure and set point on an easy-to-read process scale. Controller types are available for proportional-only, proportional-plus-reset, proportional-plus-reset-plus-rate, and differential gap for on-off control.

Instruction Manuals: 4195KA, KB, KC and KS Gauge Pressure
Product Bulletins: 4195K Gauge Pressure Indicating Controllers
High-Low Pilot: Fisher® 4660 Pneumatic Pressure Pilot
The Fisher® high-low pressure pilot product offering maintains full output when the process is within the set point range. If the process moves outside of this range, the pilot switches to zero output.

High-Low Pilot - Pneumatic Pressure ControlFisher® 4660 pneumatic high-low pressure pilot activates safety shutdown systems for flowlines, production vessels, and compressors. This pilot is available with either single or dual set point capability. Repeatability meets the U.S. Minerals Management Service test tolerances referenced in Outer Continental Shelf (OCS) Order No. 5 and defined in the American Petroleum Institute (API) RP14C standard.

Instruction Manuals: Fisher 4660 High-Low Pressure Pilot
Product Bulletins: Fisher 4660 High-Low Pressure Pilot
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