Core Technical Advantages
-
Dual-Pressure Sensing: The 4194 senses two distinct pressures and compares their difference against an operator-defined set point. This is critical for applications like filter monitoring, flow measurement, and heat exchanger performance tracking.
-
High-Visibility Display: Operators can check process status from a distance using the 114 mm (4 1/2 inch) white-on-black scale. Two red pointers provide an instant visual comparison between the actual differential pressure and the set point deviation.
-
Vibration Resilience: By utilizing a low-mass internal design, the controller maintains accuracy even when mounted directly on vibrating actuators or in high-intensity plant environments.
-
Tool-Free Field Adjustments: Maintenance and setup are streamlined; you can adjust the set point, zero, span, and switch between direct and reverse action quickly without specialized tools.
-
Pneumatic Efficiency: The refined relay and nozzle design lowers steady-state air consumption to as little as 0.09 normal m3/hr (5 scfh), reducing the overall demand on the plant’s compressed air system.
-
Environmental Durability: The tough plastic housing is designed to resist corrosive atmospheres, and internal options are available to handle corrosive supply media like sour gas.
Technical Core
| Feature | Technical Specification / Detail |
| Control Modes | Proportional only, Proportional-plus-reset, or Differential gap |
| Output Signal | 0.2 to 1.0 bar (3 to 15 psig) or 0.4 to 2.0 bar (6 to 30 psig) |
| Supply Medium | Air or Sweet Natural Gas (Sour gas options available) |
| Steady-State Consumption | 0.09 m3/h (5 scfh) |
| Mounting Options | Actuator, Pipestand, Wall, or Panel |
| Scale Size | 114 mm (4.5 inch) |
| Indicators | Differential Pressure, Set Point, Supply Pressure, Output Pressure |
Applications and Industry Sectors
The 4194 is primarily used where accurate measurement of differential pressure is the key to process safety and efficiency.
-
Oil and Gas: Monitoring pressure drops across filters and separators to schedule maintenance before flow is restricted.
-
Power Generation: Controlling differential pressure in cooling water systems and steam headers.
-
Chemical Processing: Maintaining specific pressure gradients across reactors or distillation columns.
-
Water Treatment: Managing backwash cycles for large-scale filtration units based on membrane pressure differentials.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major Fisher Valves supplier, providing a comprehensive range of Fisher solutions. We specialize in providing original, high-efficiency Emerson automation solutions to industrial clients. Beyond supplying core hardware like the 4194 Differential Pressure Controller, we leverage deep technical expertise to provide professional support and model selection guidance for procurement and engineering projects. By optimizing our supply chain, we provide a distinct pricing advantage, ensuring we offer highly competitive prices while assisting clients in optimizing processes and achieving digital upgrades.
If you are currently selecting a sensing element for a high-static pressure application and need to verify the maximum pressure limits of the bellows or capsules, please contact our technical team.
