Core Technical Advantages
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High-Efficiency Design: The C1 is engineered to meet strict environmental standards. Its steady-state consumption rate is less than 6 scfh, making it compliant with US EPA New Source Performance Standards (NSPS) for the oil and gas industry.
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Versatile Sensing Elements: Depending on your pressure requirements, the C1 can be outfitted with:
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Bourdon Tubes: For high-pressure applications.
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Bellows: For vacuum and low-pressure service.
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Severe Service Readiness: To handle corrosive sour gas environments, constructions are available that comply with NACE MR0175 / ISO15156 and NACE MR0103 metallurgical standards.
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Operational Reliability: A built-in spring-out cleaning wire allows technicians to clear the relay orifice during operation, preventing shutdowns caused by dirty instrument air.
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Flexible Mounting: The rugged case is designed for diverse field conditions and can be mounted on a panel, wall, pipestand, or directly onto a control valve actuator.
Technical Core
| Feature | Technical Specification / Detail |
| Functions | Controller (Proportional, Reset, Anti-reset windup) or Transmitter |
| Input Ranges | Vacuum up to 8000 psig (552 bar) depending on element |
| Output Signal | 3-15 psi (0.2-1.0 bar) or 6-30 psi (0.4-2.0 bar) |
| Supply Media | Air or Sweet Natural Gas |
| Steady-State Consumption | < 6 scfh (0.16 m³/hr) |
| Materials | Aluminum case; Stainless Steel or Monel internal hardware available |
| Modes | Direct or Reverse acting (Field reversible) |
Applications and Industry Sectors
The C1 is chosen for its simplicity and set-and-forget reliability in remote or hazardous locations.
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Upstream Oil and Gas: Ideal for wellhead pressure control and separator vessel pressure management where natural gas is used as the supply medium.
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Refining and Petrochemical: Used in sour gas service and environments where electronic power is unavailable or poses a safety risk.
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Pulp and Paper: Reliable local pressure indication and control for steam and water lines.
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Utilities: Managing gas distribution pressure in city gate stations.
Xi’an Yunrui Trading Co., Ltd. Technical Support
Xi’an Yunrui Trading Co., Ltd. is a major supplier of Fisher brand products. We specialize in providing original, high-efficiency Emerson automation solutions to industrial clients. Beyond supplying core hardware like the C1 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 upgrading from older 4150 series units and need to confirm the correct Bourdon tube material for your process, please contact our technical team for a detailed consultation.
