For terminal operators, refinery and chemical engineers, boiler & heater treater operators, water/wastewater utilities, and EPC specifiers who need high-integrity point-level control on pressurized vessels or bypass chambers, the Omnitrol 664F / 666F / 668F delivers rugged flanged chamber construction, factory specific-gravity calibration, and predictable switching differentials across a wide range of process fluids.
Unlike float switches or capacitance probes that can foul, drift, or require frequent field adjustment, the 66xF family uses displacer-based magnetic switching inside a forged flanged chamber, hydrostatically tested to 1.5× rated pressure and tuned to the process liquid density at the factory—providing accurate, code-compliant alarm actuation with zero calibration in the field.
Ideal for API 2350 overfill protection, separator service, heater treaters, steam systems, and pressurized tank bypass chambers, this series ensures safe isolation, long life, and reliable switching where intrusive wetted switches are not desired.
Integrates with plant piping standards; simplifies installation and maintenance isolation.
Calibrated to actual process specific gravity for right-first-time alarm actuation.
Published differentials by model/SG eliminate guesswork and field tuning.
Each unit tested at 1.5× design pressure for mechanical integrity and commissioning confidence.
Explosion Proof/Vapor Proof/Rain Tight variants for safe use in hazardous and outdoor environments.
SPDT/DPDT micro options to interface directly with controls, shutdown systems, and annunciators.
Excellent chemical and temperature resistance for broad process compatibility.
The Omnitrol 664F / 666F / 668F provides single-point mechanical level switching using a displacer and magnetic snap-action mechanism contained within a pressure-rated flanged chamber. Each unit is factory-set for the liquid specific gravity, ensuring a predictable actuation point without field calibration.
The compact flanged design enables drop-in installation on pressurized vessels, side chambers, bypass columns, and interface separators, with the ability to service the switch head without vessel entry. With UL/CSA approvals, ANSI 150–1000 lb flange compatibility, and up to 1000 psig @ 500 °F ratings, the 66xF series is built for heavy-duty refinery and industrial service.
| Parameter | Specification |
|---|---|
|
Models |
664F (4″ chamber), 666F (6″ chamber), 668F (8″ chamber) |
|
Technology
|
Mechanical displacer with magnetic snap-action switching |
|
Chamber Style |
Flanged external bypass chamber |
|
Pressure/Temperature |
Up to 1000 psig @ 500 °F (per config) |
|
Specific Gravity |
Max SG 1.7 — factory calibrated |
|
Displacer |
Graphite standard (other materials optional) |
|
Process Connections |
ANSI 150 / 300 / 600 / 1000-lb (model dependent) |
|
Enclosures |
Weather-resistant, Explosion-proof/Vapor-proof/ Rain-tight |
|
Hazard Ratings |
UL / CSA Class I Groups B-D; Class II Groups E-G |
|
Switch Options |
SPDT / DPDT microswitches, field-wiring terminals |
|
Mounting |
Side chamber bypass or pressurized vessel ports |
|
Approvals |
UL, CSA Approved |
Have a look at the flyer to get all the tech specs and product features.
Brochure
Read the manual for detailed information and instructions.
Manual
Check out a sample cert from our calibration lab.
Certificate
If you have a question that we have not covered then just get in touch and we’ll be happy to help.
We have tried to answer the most common questions we are asked here.
No — they are factory calibrated to your liquid’s specific gravity.
Yes — up to 1000 psig and 500 °F, depending on configuration.
The flanged design provides a highly robust, secure, and easily verifiable pressure seal that meets standard plant piping specifications. This is critical in high-pressure applications where integrity is paramount, and it simplifies the process for maintenance isolation using standard spool piece removal.
The hydrostatic proof test verifies the physical integrity of the welded chamber by subjecting it to 1.5 times the maximum rated pressure before it leaves the factory. This provides an extra layer of quality assurance and regulatory compliance, confirming the vessel integrity for high-pressure service.
Yes — the external chamber design allows head removal without tank entry.
Pressurized vessels, heater treaters, bypass chambers, separators, boilers, API 2350 overfill points.
Choose 666F/668F when handling lower-SG fluids requiring tighter switching differentials.