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Omnitrol  610/710

Top-Mounted Level Switches with Graphite Displacers

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Omnitrol  610/710

For refinery, petrochemical, wastewater, and power-generation engineers who require rugged, reliable point-level control in demanding liquid service, especially under pressure, high temperature, or hazardous conditions, the Omnitrol 610 / 710 Series delivers magnetically actuated graphite displacer technology that ensures precise, repeatable switching without external power or ongoing calibration.

Unlike float switches or capacitance sensors that can foul, drift, or false trip under turbulence, foam, or coating, the Omnitrol design uses a sealed displacer assembly, dual-magnet snap-action mechanism, and Inconel spring reliability for positive actuation, zero leakage to atmosphere, and long service life in the harshest industrial applications.

The 610 provides single-point control, while the 710 offers dual independent switch points, ideal for pump protection, high or low alarms, and safety interlocks across mission-critical process operations.

Omnitrol  610/710
Omnitrol  610/710
Omnitrol  610/710

Features

Positive Snap Switching

Magnetically coupled snap-action ensures vibration-proof actuation and eliminates intermediate drift or unstable switching points.

Foam/Turbulence Immunity

Archimedes-principle displacer actuation remains accurate even during agitation, coating, or foaming conditions.

Single or Dual Points

Choose one or two independent actuation levels for pump control, alarms, shutdown functions, or overfill logic flexibility.

High-Pressure Isolation

All-metal isolation tube safely separates process pressure from the switch housing up to 1500 PSIG service.

Hazardous Area Safety

Approved for Class I Groups B, C, D and Class II Groups E, F, G service, protecting against vapor ingress and ignition.

No Calibration Needed

Factory-set specific-gravity calibration remains stable despite pressure, temperature cycling, or long-term operation.

Applications

  • Overfill Protection: Dual-point switching provides high/high-high actuation for reliable shutdown during tank overfill scenarios.
  • Pump Control: Single- or dual-point configurations enable low-level cutout and refill logic to prevent cavitation and dry-run damage.
  • Foamy Liquids: Magnetic displacers maintain accurate switching performance even when product surfaces foam or coat instrumentation.
  • Hazardous Areas: Explosion-proof construction ensures safe, compliant operation in electrically classified process facilities.
  • High-Pressure Service: Alloy isolation tubes and Inconel springs maintain reliable switching in elevated pressure and temperature conditions.
  • Corrosive Chemicals: Solid graphite displacers resist swelling and chemical attack, delivering long-term performance in aggressive media.
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Specifications

Type

Top-mounted

Operation

Buoyancy (Archimedes) principle; magnetic snap-action actuation

Models

610 (Single actuator – one set point); 710 (Dual actuator – two set points)

Housing

WR or Explosion-Proof/Vapor Proof/Rain Tight

Pressure Rating

Up to 1500 PSIG (10335 kPa)

Temperature Rating

–100°F (–73 °C) to +400°F (+204°C) depending on material

Switch Options

SPDT / DPDT micro switches;

Electrical Entry

¾″ NPT conduit

Mounting

Threaded (2 ½″ NPT) or ANSI flange (150# – 1500#)

Process Connection Materials

316 SS, Carbon Steel, 304 SS, Cast Iron

Displacer Material

Graphite displacers give long-term, repeatable switching performance in harsh services where other materials would creep, swell, or corrode.

Certifications

UL approved

Maintenance

Annual inspection and functional test recommended; no field calibration required

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

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What is the difference between the 610 and 710 models?

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The 610 provides one switching point; the 710 provides two independent switching points for high/low or dual-alarm logic.

Does the Omnitrol require external power?

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No — it operates using mechanical displacer movement and magnetic switching.

How does the magnetic snap-action mechanism prevent false switching?

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The dual-magnet snap-action mechanism provides strong resistance against vibration and agitation. The switch mechanism is held firmly in its ON or OFF state by magnetic force until the displacer’s buoyant force overcomes that latch, ensuring a positive, immediate switch actuation only when the true liquid level is reached.

Can it be used in turbulent or foamy applications?

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Yes — displacer technology is resistant to agitation, foam, and coating unlike floats or ultrasonic devices.

Why is this switch ideal for high-pressure and high-temperature services?

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The 610 / 710 Series uses an All-Metal Isolation Tube (316 SS) to completely seal the switch mechanism from the process fluid. This design ensures that pressure and temperature extremes (up to 400°F) are contained by the rugged metal barrier, protecting the internal electronics and switch components from failure.

Is field calibration required?

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No — units are factory-set to fluid specific gravity and are maintenance-light.

Where are these commonly used?

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Refineries, chemical plants, power stations, wastewater treatment, storage terminals, separators, and knockout drums.

Is it suitable for overfill protection?

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Yes — tested to API 2350 methodology for high-/high-high level safety shutdown systems.

Summary

The  Omnitrol 610 / 710 Series combines magnetic displacer technology, explosion-proof reliability, and precision switch performance for dependable level control in the toughest process environments. Whether used for pump control, alarm, interlock, or overfill protection, these controls deliver repeatable performance without external power or recalibration.

Backed by our century plus of expertise, Omnitrol units provide safer operations, reduced maintenance, and unmatched durability for process industries worldwide.

L&J
Measure.
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