Core Technical Advantages
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Process Isolation: The switching mechanism is completely isolated from the process fluid via a corrosion-resistant torque tube assembly. This eliminates the need for dynamic seals that could leak, significantly increasing long-term reliability.
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NACE Compliance: Standard constructions are available to meet NACE MR0175-2002 requirements, making them suitable for sour oil and gas applications where H2S is present.
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Flexible Mounting and Piping: The displacer cage features two 1-inch NPT pipe plugs that can be relocated to accommodate either horizontal or vertical equalizing piping. Additionally, the switch itself can be ordered in left-hand or right-hand mounting configurations to fit tight skid spaces.
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Field-Reversible Action: The switching logic is easily reversible in the field. You can switch from high-level trip to low-level trip (or vice versa) without needing to purchase any additional parts or conversion kits.
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Electric Retrofit Capability: The 2100E features an explosion-proof, hermetically sealed electric switch. This module can be factory-installed or purchased as a retrofit kit to convert existing pneumatic 2100 units to electric operation.
Technical Core
| Feature | Technical Specification / Detail |
| Operation Type | On/Off (Snap-acting) |
| Signal Types | Pneumatic (2100) or Electric (2100E) |
| Sensing Method | Displacer with Torque Tube |
| Cage Connections | 1-inch NPT (Standard) |
| Mounting | External Cage (Right-hand or Left-hand) |
| Pressure Rating | Up to 138 bar (2000 psig) depending on material |
| Temperature Limits | Standard: -29 to 204°C (-20 to 400°F) |
Applications and Industry Sectors
The 2100 series is the “first line of defense” in mechanical safety loops for oilfield separators and tanks.
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Oil & Gas Production: Providing high-level shutdown for 2-phase and 3-phase separators to prevent liquid carryover into gas lines.
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Compressor Skids: Monitoring liquid levels in scrubber tanks to protect compressor cylinders from liquid slugs.
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Storage Tank Farms: Acting as an independent high-level alarm or pump-cut-off switch for crude oil or produced water tanks.
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Chemical Processing: Handling corrosive or sour fluids in outdoor environments where rugged, isolated sensing is required.
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 2100 Liquid Level Switch, 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 designing a safety loop and need to verify the specific gravity (SG) requirements for the displacer to ensure a positive snap-action, please contact our technical team for a buoyancy calculation.
