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610 / 710 Displacers

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.

610 / 710 Displacers

Details

The Omnitrol 610 / 710 Series uses a magnetically coupled displacer mechanism to detect buoyancy changes as liquid level rises or falls. Movement of the displacer triggers a dual-magnet snap-action switch, delivering crisp, repeatable operation without external power, linkages, or adjustments.

Built for hazardous service and severe process environments, each unit isolates process media using heavy-duty stainless steel, Monel, or Hastelloy tubes, with Inconel springs providing exceptional fatigue resistance. This sealed mechanical system maintains reliability where electronics and moving floats often fail.

The 610 model provides a single switching point, ideal for pump start or stop or level alarm functions.

The 710 model adds a second independent actuator, allowing high/high-high or low/low-low logic from a single tank penetration, reducing installation cost and improving safety redundancy.

Designed for process vessels, sumps, columns, separators, and chamber mounts, the Omnitrol series remains a preferred choice for API 2350 overfill safety, process control, and equipment protection in industrial fluid systems worldwide.

Applications

Process Overflow Risk: The dual-level 710 model provides independent automatic high and high-high shutdown protection.
High-Viscosity or Foamy Fluids: Magnetic displacer technology operates reliably where foam or coating would blind or stick mechanical floats.
High-Pressure / High-Temperature Service: Alloy isolation tubes and Inconel springs ensure long-term reliability under extreme process conditions.
Hazardous Environments: Explosion-proof housing and sealed isolation tube ensure safe operation in Class I and Class II areas.
Pump Protection: The 610 model can be configured for low-level cut-out to prevent equipment damage from dry run or cavitation.

Technical Specifications

Parameter

Specification

Technology

Magnetic displacer with snap-action switching

Models

610 (single point), 710 (dual point)

Mounting

2-½″ NPT or flanged connections

Housing Options

WR or explosion-proof / vapor-proof / rain-tight

Pressure Rating

Up to 1500 PSIG (10,335 kPa)

Temperature Limits

−100 °F (−73 °C) to +400 °F (+204 °C)

Switch Types

SPDT / DPDT micro switches

Switch Ratings

10 A, 15 A, 5 A

Conduit Entry

¾″ NPT

Displacer Material

Graphite displacer

Mounting Options

Threaded (2½″ NPT) or ANSI 150#–1500# flanges

Certifications

UL / CSA approved

Maintenance

Annual inspection recommended; no calibration required

2026 COST ESTIMATE

Support

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

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?

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

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

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?

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?

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?

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

Where are these commonly used?

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

Is it suitable for overfill protection?

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