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Omnitrol  666/668(C)

Compact Chamber Mounted Level Switches

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Omnitrol  666/668(C)

For refinery engineers, chemical plant operators, power generation teams, boiler and steam system designers, and EPC specifiers who need high-pressure, high-temperature point-level protection with mechanical certainty, the Omnitrol 666 / 668 (C) delivers compact, chamber-mounted displacer switching engineered for extreme duty environments.

Unlike electronic switches that can drift or fail under heat, vibration, and pressure cycling, the Omnitrol 666 / 668 (C) uses proven mechanical displacer technology, welded “C”-style chambers, and field-proven magnetic snap-action switching to ensure fail-safe level protection for liquids, including low-specific-gravity hydrocarbons, solvents, and steam condensate.

Ideal where space is limited, reliability is critical, and electronics are not preferred, this model provides a field-proven solution for pressurized vessels, blow-down drums, steam systems, condensate pots, and hazardous media tanks.

Omnitrol  666/668(C)
Omnitrol  666/668(C)
Omnitrol  666/668(C)

Features

Compact Welded "C" Chamber

Provides excellent performance on low-SG liquids and high-pressure services where space is limited for installation.

Mechanical Displacer Technology

Proven reliability in harsh environments with no electronics required—ideal for safety systems, utilities, and critical applications.

Sealed External Design

Full isolation from tank internals ensures safe operation in pressurized or corrosive media without internal penetration.

Hazardous-Area Approvals

Safe deployment in refineries, chemical plants, and hazardous vapor environments with UL and CSA certified explosion-proof housings.

Multiple Housing Options

Flexibility for outdoor, classified, and corrosive areas while meeting electrical safety codes for Weather-proof and Explosion-proof configurations.

Fail-Safe Switching Mechanism

Ensures process protection for high/low level alarms, pump shutdown, and safety interlocks through mechanical snap-switch actuation.

Applications

  • High-Pressure Vessels: Welded chamber and mechanical switch design provides durable, non-electronic solution for reliable shutdown and alarm performance in extreme conditions.
  • Low-Gravity Liquids: Proven displacer sensitivity ensures accurate and repeatable switching on LPG, NGLs, and solvent applications where standard floats fail.
  • Boiler Safety Interlocks: High-integrity mechanical actuation offers drift-free, fail-safe protection for boilers and steam systems without relying on electronic controls.
  • Chemical Tanks: External chamber isolation and explosion-proof housing protect switch from corrosive media and hazardous vapors for long service life.
  • Interface Detection: Available for interface service on special order; factory calibration accommodates specific gravity of both liquids for accurate level switching.
  • Pump Protection: Independent mechanical trip mechanism provides reliable high or low level alarm for pump shutdown interlocks without PLC dependency.
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Specifications

Design

Single-point mechanical displacer level switch

Chamber Style

Short welded “C” body

Service

Liquid level, high or low alarm / trip

Displacer Material

Graphite standard; stainless steel optional

Mounting

External side & bottom connections (1” NPT std; flange/weld options)

Housing Options

Weather-resistant, Explosion-proof /Vapor Proof/Rain Tight

Pressure / Temp

Designed for high-pressure / high-temp process service (See specific datasheet for class & limits per model)

Switch Mechanism

Field-proven magnetic coupling + snap switch output

Actuation

Single setpoint

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If you have questions not covered here, please contact the Cognesense support team for assistance.

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Why choose a chamber-mounted mechanical switch instead of an electronic device?

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Mechanical displacer switches offer fail-safe action, no drift, and immunity to heat and EMI — ideal for safety and steam service.

What types of fluids work with the 666 / 668 (C)?

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Hydrocarbons, condensate, light solvents, process water, and most refinery/chemical liquids — including low-specific-gravity fluids.

Does this model support multiple switch points?

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No — the 666/668(C) is a single-point switch.

Can this unit be serviced without opening the tank?

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Yes — all mechanical components are external, enabling safe isolation and maintenance.

⁠Is it suitable for boiler and steam service?

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Yes — its pressure-rated chamber and mechanical design make it ideal for steam drums, blow-down systems, and condensate vessels.

What makes this model effective for low-specific-gravity fluids?

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The displacer system is engineered to sense very small density changes, outperforming floats and ultrasonic devices in LPG/NGL and solvent service.

Summary

The  Omnitrol  666/668(C) chamber-mounted level switches deliver rugged mechanical reliability, compact pressure-rated construction, and superior performance in low-SG and hazardous service environments. When safety, simplicity, and durability matter most, especially on pressurized vessels, this switch offers proven protection without electronics, drift, or complexity.

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Measure.
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