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Omnitrol  613/713

Top Mounted Level Switches with Porcelain Displacers

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Omnitrol  613/713

For refinery operators, chemical plant engineers, wastewater utilities, terminal automation teams, and EPC designers who require dependable point-level control, pump automation, and overfill protection in harsh industrial environments, the Omnitrol 613 / 713 Series with porcelain displacers offer proven magnetic displacer switching, exceptional chemical resistance, and safe operation in hazardous areas.

Unlike floats, reed switches, or capacitive sensors that fail in foamy, dirty, or coating-prone liquids, the Omnitrol 613 / 713 uses buoyancy-based displacers and a snap-action magnetic mechanism for accurate, drift-free switching unaffected by turbulence, vapor layers, solids, or buildup.

The 613 model provides a single switching point, while the 713 delivers dual independent alarm points, making it ideal for pump start and stop or API 2350 high-high level shutdown systems.

Porcelain displacers offer a unique advantage in corrosive or fouling environments where stainless steel may corrode and graphite is unnecessary.

Omnitrol  613/713
Omnitrol  613/713
Omnitrol  613/713

Features

Accurate Displacer Sensing

Maintains reliable actuation in foaming, dirty, viscous, or vapor-laden liquids where floats, reeds, or ultrasonics drift, foul, or lose measurement stability.

Positive Magnetic Snap-Action

Delivers chatter-free switching with no null zone, ensuring decisive actuation even under turbulence, surges, or rapidly changing process conditions.

Single or Dual Actuation

Supports one or two independent switch points, enabling alarm redundancy, pump start/stop sequences, or high-high overfill protection in a single device.

Hazardous-Area Safety

Explosion-proof housings and Class I, Div. 1 approvals allow safe use in hydrocarbons, vapors, and classified environments requiring certified electrical protection.

Top-Mount Installation

Installs directly from the tank top, simplifying access, eliminating side-wall penetrations, and allowing easy integration into new or existing vessels.

Porcelain Displacer Durability

Provides high density, chemical resistance, and non-fouling performance where stainless steel may corrode or graphite exceeds required ruggedness.

Applications

  • Foam & Viscous Media: Delivers stable switching in sticky, turbulent, or foamy liquids where floats or probes foul, drift, or lose reliable actuation.
  • Overfill Protection: Supports API 2350-aligned high and high-high alarms to prevent spills, protect assets, and maintain safety compliance in tank farms.
  • Pump Start/Stop: Provides adjustable switching differentials for dependable pump control that prevents dry-run damage and reduces wear from short-cycling.
  • Pressurized Vessels: Handles high-pressure and high-temperature operation using solid porcelain displacers and rated isolation tubes for demanding service conditions.
  • Wastewater & Sumps: Resists ragging, debris, and turbulence using non-fouling glazed porcelain surfaces to ensure dependable level actuation in harsh environments.
  • Chemical Processes: Maintains reliable operation in corrosive or variable-density liquids, supporting alarms and interlocks for critical process control loops.
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Specifications

Technology

Displacer-type level detection (Archimedes’ principle snap-action magnets)

Single Switch Model

613

Dual Switch Model

713

Switching

Snap-action magnetic switching — no mid-travel null zone SPDT / DPDT microswitch options Mounting Options Top mount Process Conditions

Typical Pressure

up to 1500 psi (103 bar) with appropriate isolation tube

Temperature

up to ~400°F (204°C) depending on configuration

Materials

Displacer Material

Porcelain

Isolation Tube

316 stainless steel

Housing

Weather-Resistant (WR) Explosion-Proof / Vapor-Proof (EP/VP) — Class I, Div 1, Groups B, C, & D Explosion-proof/Rain Tight- Class I, Div 1, Groups C & D Electrical

Conduit

¾” NPT

DPDT or SPDT Options

Certifications UL Approved

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

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Why use porcelain instead of stainless steel or graphite displacers?

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Porcelain resists chemical attack and coating, offering the ideal balance where stainless may corrode and graphite offers more ruggedness than needed (higher cost).

How does the magnetic snap-action mechanism prevent false alarms in turbulent tanks?

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The magnetic snap-action mechanism uses internal magnets to lock the switch contacts into their ON/OFF position. The process liquid must exert enough buoyant force to physically overcome this magnetic latch. This design makes the switch highly immune to minor agitation, surface foam, or turbulence that would cause traditional float switches to chatter or produce false alarms.

Can the 613 / 713 be configured for both high-level and low-level control in one tank?

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Yes. The Omnitrol 713 model is the dual-actuator version, meaning it houses two independent switching mechanisms that can be set at different levels. This allows the device to manage both a low-level pump-off setpoint and a high-level alarm setpoint simultaneously using a single tank penetration.

When should the 713 be chosen over the 613?

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Use the 713 for dual alarms or pump control (start/stop or high-high). The 613 is for a single alarm or control point.

Does the device require calibration?

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No — factory-set to media specific gravity; no field calibration required.

Is it suitable for foamy or turbulent liquids?

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Yes — displacer technology is immune to foam, turbulence, and vibration.

Can it be used in pressurized tanks?

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Yes — high-pressure isolation tube options support pressurized and boiler service.

Is the unit explosion-proof?

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Yes — available with Class I & II Div 1 approvals for hazardous process environments.

What industries commonly use porcelain displacers?

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Refineries, chemical plants, terminals, power plants, and wastewater facilities—especially where chemicals, solvents, or fouling media are present.

Summary

The  Omnitrol  613 / 713 delivers rugged, dependable level point control where safety, chemical resistance, and mechanical reliability matter most. Engineered to avoid fouling for harsh industrial liquids, foam, turbulence, and high-pressure systems, it ensures positive switching and reliable alarms for tank farms, chemical reactors, sumps, boilers, and API 2350 overfill protection.

With single/dual-actuator capability (613/713) for multiple alarm/control points, hazardous-area approvals, and displacer-based technology proven in refineries and chemical plants for decades, the 613/713 is a cost-effective, durable choice for demanding industrial level switching applications.

L&J
Measure.
Monitor.
Protect.