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Omnitrol  616/716

Top-Mounted Level Switch with Stainless Steel Displacer

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Omnitrol  616/716

For tank farm operators, refinery engineers, wastewater plant operators, and chemical processors who require dependable level monitoring, pump protection, and overflow prevention, the Omnitrol 616 and 716 Top Mounted Level Control Switches provide a rugged and reliable solution.

These displacer-actuated switches use stainless steel displacers designed for long service life and are ideally suited for corrosive, hazardous, or high-value liquid products.

Unlike side-mounted or welded designs, the top-mounted configuration allows easier tank access and simplified maintenance, while still delivering precise actuation, durable construction, and dependable long-term performance.

Omnitrol  616/716
Omnitrol  616/716
Omnitrol  616/716

Features

Corrosion-Resistant Construction

Stainless-steel displacers and isolation components tolerate acidic, alkaline, and hydrocarbon media, preventing deterioration common with porcelain, graphite, or polymer elements.

Stable Performance in Turbulence

Weighted sinking displacers ignore surface agitation, foam, and wash conditions, maintaining reliable switching without nuisance alarms in dynamic process vessels.

High-Temperature Capability

Design materials allow operation up to 500°F, enabling dependable level actuation in hot condensate, thermal oils, and high-temperature chemical applications.

Adjustable Switching Differential

Field-positionable displacers let operators set precise control points or pump on/off bands without external controllers or additional interface hardware.

Strong Magnetic Snap-Action

A constantly engaged magnetic field ensures positive “make/break” switching with no drift, even under vibration or rapid process level changes.

Multi-Switch Flexibility

Available SPST, SPDT, DPST, and DPDT configurations support alarms, pump control, and shutdown circuits across a wide range of electrical systems.

Applications

  • Boiler Water Level: Provides stable switching unaffected by turbulence, delivering reliable actuation to prevent nuisance trips or burner shutdowns in steam systems.
  • Hot Oil Service: Handles elevated temperatures and viscous hydrocarbons, ensuring dependable pump and alarm control in refinery and process-heating loops.
  • Chemical Storage Tanks: Resists corrosive liquids, supporting long-term level control for acids, alkalis, and aggressive chemical solutions in batch or continuous operations.
  • Sumps and Drain Pits: Maintains consistent operation in dirty or agitated environments, improving pump cycling reliability during variable inflow conditions.
  • Condensate Return Systems: Performs accurately in hot condensate streams, ensuring pump protection and proper condensate recovery under fluctuating load conditions.
  • Refinery Process Vessels: Supports high-temperature, variable-density fluids, enabling robust alarm and control functions in demanding petroleum process equipment.
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Specifications

Mounting

Top-mounted, 2-1/2″ NPT or ANSI flange (150#-1500#)

Actuation

Magnetic snap-action switch mechanism

Switch Types

SPDT, DPDT micro switches

Displacer

Stainless steel weighted sinking displacer

Cable Length

10’ standard; up to 75’ (600 series); 40’ (700 series)

Specific Gravity Range

0.70 – 2.0 (±0.2 variation)

Temperature

Up to 500°F (material dependent)

Differential Range

2.5″ to full cable travel

Certifications

UL

Housing

WR or Explosion-Proof/Vapor Proof/Rain Tight

Applications

Water, oils, petrochemicals, acids/alkalis, hot condensate

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How does the displacer mechanism work for level detection?

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The displacer mechanism relies on the change in buoyant force exerted on a suspended displacer element as the liquid level rises or falls. When the liquid level crosses a specific trip point, the resulting change in buoyant force moves the displacer, which mechanically actuates the switch contacts to trigger an alarm or control action.

Why choose stainless steel displacers?

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Stainless steel is the ‘workhorse’ choice. Stainless steel displacers offer superior resistance to corrosion, aggressive chemicals, and deformation at elevated temperatures compared to materials like plastic or aluminum. This durability ensures the switch remains reliable and accurate over a longer service cycle, minimizing replacement frequency while saving cost vs graphite if the extreme-duty requirements of graphite are not present.

How does the top-mounted design simplify maintenance?

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In a top-mounted configuration, the entire switch assembly, including the displacer, can be accessed and removed from the top of the tank. This eliminates the need for side-entry work or extensive scaffolding and is generally considered easier and safer for inspection and replacement compared to accessing units mounted deep inside the tank or on the side chamber.

Summary

The  Omnitrol  616/716 provides rugged, adjustable top-mounted level control designed for demanding industrial environments including refining, chemical processing, boilers, and bulk liquid handling. With stainless steel displacers, robust magnetic actuation, and flexible switching configurations, the 616/716 eliminates nuisance trips, handles aggressive media and high temperatures, and offers reliable long-term performance where safety and uptime matter. Stainless steel displacers ensure superior durability, chemical resistance, safety, and reliability legacy designs.

L&J
Measure.
Monitor.
Protect.