Core Technical Advantages
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Dependable Control Logic: The two-stage proportional relay with integral action ensures that the controller responds predictably to level changes, providing stable operation even when process conditions fluctuate.
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Pressure and Vibration Immunity: Unlike simpler float switches, the L2 design minimizes the impact of O-ring friction and process pressure sensitivity. This means its performance remains constant even as vessel pressure changes, and it stays functionally “silent” during high-vibration scenarios.
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Extreme Pressure Rating: When equipped with a Polyvinylchloride (PVC) displacer, the sensor assembly is rated for ASME B16.34 CL1500 service. This makes it suitable for high-pressure separators and scrubbers.
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Field Flexibility: The controller and displacer can both be reconfigured in the field for direct or reverse action and vertical or horizontal mounting—all without needing to order additional parts.
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Environmental Compatibility: Because the exhaust can be piped away, these units are ideal for remote locations where sweet natural gas is used as the supply medium instead of compressed air.
Technical Core
| Feature | Technical Specification / Detail |
| Sensor Type | Displacer-style (Buoyancy) |
| Max Pressure | CL1500 (with PVC Displacer) |
| Supply Media | Air or Sweet Natural Gas |
| Control Action | Field-reversible (Direct or Reverse) |
| Mounting | Vertical or Horizontal (Field-adjustable) |
| Service Type | Liquid Level or Liquid-Liquid Interface |
| Maintenance | Modular design for easy seal inspection |
| Output Signal | Pneumatic Proportional |
Applications and Industry Sectors
The L2 and L2sj are standard specifications in the midstream and upstream sectors where reliability is non-negotiable.
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Natural Gas Production: Managing levels in high-pressure separators and heaters.
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Gas Compression: Monitoring scrubbers to prevent liquid carryover into compressors.
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Processing Plants: Handling liquid-liquid interface control in skimming tanks.
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Remote Pipelines: Reliable operation in unmanned stations using process gas as a power source.
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 L2 and L2sj Liquid Level Controllers, 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 deciding between the L2 (standard) and the L2sj (short sensor) for a space-constrained application, or if you need to confirm seal compatibility for a specific sour gas process, please contact our technical team for expert guidance.
