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Omnitrol 764, 766, 768 (F)

Flanged Chamber Mounted Level Switches

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Omnitrol 764, 766, 768 (F)

For refinery and petrochemical operators, terminal automation teams, chemical and wastewater plant engineers, pump control system designers, and EPC firms who require two independent level switching points in a single external chamber, the Omnitrol 764 / 766 / 768 (F) provides a dual-actuator displacer switch designed for high-pressure service, clean alarm logic, and reliable pump start/stop control.

Unlike alternatives that require two vessel penetrations, complex wiring, or electronic tuning, the 76xF series combines:

  • Two mechanically independent setpoints
  • Factory-calibrated specific gravity settings
  • Adjustable switching gap
  • Hydrostatic proof testing at 1.5× design pressure
  • UL and CSA hazardous-area approvals

The result is a maintenance-friendly flanged chamber level switch that provides predictable HI / LO or pump control points in a compact and rugged design. It is ideal for pressurized and safety-critical applications across upstream, midstream, downstream, and industrial process facilities.

Omnitrol 764, 766, 768 (F)
Omnitrol 764, 766, 768 (F)
Omnitrol 764, 766, 768 (F)

Features

Dual Independent Actuators

Two independent set points in one chamber enable high/low alarms or pump start/stop control, reducing vessel penetrations and simplifying wiring while improving control logic clarity.

Adjustable Switching Gap

Standard 4-inch gap adjustable from 2 to 6 inches allows tailoring differential to process dynamics like surge and slosh, preventing nuisance trips and pump short-cycling.

Multiple Pressure Classes

Available across ANSI Class 150, 300, 600, and optional higher ratings with 1.5× hydrostatic testing, providing confidence for ASME-rated pressure systems and stringent mechanical integrity standards.

Factory SG Calibration

Each unit calibrated to specified liquid specific gravity up to 1.4 maximum with published switching differentials, ensuring accurate trip points matched to actual media density.

Flanged Body Construction

Removable flanged design enables easier maintenance access, inspection, and reconfiguration compared to welded chambers, supporting evolving process requirements and scheduled turnarounds.

Material Flexibility Options

Chamber construction available in carbon steel, 304 stainless steel, or 316 stainless steel paired with graphite displacers, accommodating corrosive services and hygienic cleanliness requirements.

Applications

  • Pump Control Systems: Dual set points with adjustable gap smooth rapid level changes in surge conditions, stabilizing pump start/stop bands and extending equipment life while eliminating nuisance trips.
  • High/Low Level Protection: Two independent actuators in one chamber body deliver both alarm functions while reducing vessel penetrations, lowering installation costs and simplifying vessel design requirements.
  • Variable Density Processes: Factory SG calibration with table-based differentials compensates for blend variations and temperature drift, ensuring accurate switching where the process actually operates under real conditions.
  • Pressure Vessel Applications: Multiple flange class options and 1.5× hydrotest rating satisfy ASME code requirements and mechanical integrity standards, supporting inspection protocols and management of change reviews.
  • Corrosive Chemical Service: Stainless steel chamber options with graphite displacers provide corrosion resistance in aggressive media, maximizing uptime and reducing maintenance frequency in challenging chemical environments.
  • Wastewater Treatment Facilities: Dual-point control with robust flanged construction handles variable flow conditions and provides reliable level switching for lift station pumps and clarifier overflow protection systems.
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Specifications

Models

764F, 766F, 768F (dual-actuator, flanged chamber).

Specific Gravity

Max SG 1.4; Table A lists switching differentials for standard SG settings. Factory calibrated to application SG.

Connections

Standard 1″ NPT process connections; other sizes/configurations available. (Flanged chamber body; see ordering guide.)

Pressure Classes

Multiple pressure ranges (see Table B in data sheet); hydrostatically tested to 1.5× MDP.

Displacer Materials

304SS, 316SS; graphite displacers available.

Certifications

UL & CSA Approved.

Related

764/766/768 also available in W (welded) single-actuator families available for simpler duties.

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When should I choose the 764 / 766 / 768 (F) instead of a single-point chamber switch?

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When you need two setpoints in one nozzle — for HI/LO alarms or pump start/stop.

What determines whether I choose the 764, 766, or 768 model?

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The spacing and chamber size — select based on desired differential and vessel dynamics.

Does this device require field calibration?

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No — it ships factory-calibrated to your specific gravity and switching differential.

Can it be installed in hazardous locations?

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Yes — available with UL/CSA explosion-proof approval.

What if I need a welded chamber instead of a flanged chamber?

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Specify 76xW for welded-chamber configurations; use 76xF for flanged.

Can I adjust the distance between the pump start and stop points?

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Yes. The 764F/766F/768F features a configurable switching gap (approx. 2–6 inches), which is the difference between the high and low setpoints. This adjustability allows engineers to deliberately set a wider differential to prevent the pump from “short-cycling” during process surge conditions.

Is the switch reliable when the product specific gravity changes?

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Yes. The unit is factory-calibrated to the specified SG of the fluid. While the switch will work across a range, the mechanical design ensures that the buoyant force needed for actuation remains consistent. By knowing the fluid’s SG, the factory ensures the physical switching points are accurate, eliminating a major source of error common in level switches.

Summary

The  Omnitrol  764/766/768 (F) is the workhorse dual-point chamber switch for mission-critical pump control and level protection. With dual actuators, adjustable switching gaps, pressure-rated flanged construction, and UL/CSA approvals, it delivers the dependable, precisely spaced trips that operators trust, while giving engineers the material, pressure, and SG flexibility needed to standardize across plants.

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