Jerguson® Magnicator® Magnetic Level Indicators — Northeast Controls Inc.
Northeast Controls Inc.

Jerguson Gage & Valve — Magnetic Level Indication

Jerguson® Magnicator® Magnetic Level Indicators

Standard · FlashProof™ · Mini-Magnicator™ · MGWR™ — Patented Dual-Ring Alnico 8 Magnet Design

How Magnetic Level Indication Works

The Magnicator is connected to a process vessel via top and bottom process connections. The chamber (or "column") fills to the same level as the vessel. Inside the chamber, a sealed float with a permanent magnet assembly rises and falls as the liquid level changes.

The indicator housing is mounted externally to the gage column — completely isolated from the process fluid. A series of bi-colored flag indicators, each containing a permanent magnet, flip when acted upon by the magnetic force from the float assembly as it moves up and down. The result is a highly visible, color-coded level display readable from a distance.

The patented Jerguson design uses two 360° annular Alnico 8 ring magnets with opposing north poles (U.S. Patent 5,743,137), producing the strongest and most focused magnetic field of any magnetic level indicator — ensuring reliable actuation of flags, switches, and transmitters even in demanding service conditions.

Magnicator® Product Variants

Jerguson® Magnicator®

Magnetic Level Indicator — Standard

Most Popular

The industry-leading magnetic level indicator. A sealed float with a patented dual-ring Alnico 8 magnet assembly rises and falls with process level, magnetically coupling to an external flag indicator completely isolated from the process fluid. Provides highly visible, maintenance-free level indication as an alternative to sight glasses.

Key Features

  • Patented dual-ring Alnico 8 magnet design (U.S. Patent 5,743,137)
  • Strongest magnetic field of any magnetic level indicator
  • WF Series wide flags — industry-best 1.5″ (38.1 mm) width
  • IP68 hermetically sealed indicator option
  • Available with NightStar® LED illumination for low-light service
  • Full range of switches and transmitters
  • Alloys from aluminum to zirconium
  • Virtually any size and mounting configuration

Specifications

Size Range12″ to 240″ vessel centers
Min. Specific Gravity0.40
Pressure RatingUp to 3705 PSIG @ 100°F (ASME B31.3)
Temperature Range-325°F to 1000°F (-198°C to 538°C)
Chamber Material316 SS standard; alloys available
Float Material316 SS standard
Process ConnectionsNPT, flanged, socket weld
StandardsASME B31.1, ASME B31.3

Resources

Magnicator BrochureMagnicator IOMMagnicator Model CodeApplication SheetRetrofit Application SheetBEF Application SheetMagnicator Drawings3D Model Builder

Indicator Options & Accessories

WF Series Wide Flag Indicator

The NEW Jerguson WF Series is the widest flag indicator available — industry-best 1.5″ (38.1 mm) width for maximum visibility. Single stainless steel precision stamping with a permanent ceramic magnet in each flag and dual rotation points. IP68 hermetically sealed construction available.

  • Industry-best 1.5″ (38.1 mm) flag width
  • IP68 rated hermetically sealed option
  • Single SS precision stamping — most reliable design
  • Permanent ceramic magnet in each flag
  • Dual rotation points for positive actuation

Hermetically-Sealed Flag Indicator

Purged with inert gas and permanently sealed for severe applications. Achieves IP-68 certification via permanent epoxy end seal — not valved or silicone seals used by competitors. 316 SS housing for excellent corrosion resistance. Ideal for offshore, cryogenic, or caustic applications.

  • IP-68 certified — permanent epoxy end seal
  • 316 SS housing for corrosion resistance
  • Inert gas purge for long-term reliability
  • Ideal for offshore, cryogenic, and caustic service
  • Dependable Jerguson flag design for outstanding visibility

NightStar® LED Illuminator

Makes the Magnicator continuously visible night or day with bright LED illumination. An array of LEDs shines on standard mechanical flag indicators — no angle dependency, clear visibility from many positions. Approved for Class I, Division 1 classified locations. LEDs rated for 10-year nominal life.

  • High-contrast indication in any lighting condition
  • Not angle-dependent — visible from many positions
  • Approved for Class I, Division 1 hazardous locations
  • LED nominal life: 10 years
  • Reduces operator exposure time in process areas

Bob Indicator

Hermetically sealed glass tube containing a lightweight "puck" magnetically coupled to the float field. As the float responds to liquid level changes, the bob indicator simultaneously follows, providing precise level measurement. An alternative to flag indicators for certain applications.

  • Hermetically sealed glass tube construction
  • Magnetically coupled to float — no process contact
  • Lightweight puck design for sensitive response
  • Alternative to flag indicators

Transmitters & Switches

All Magnicator models accept the full range of Jerguson transmitters and switches — mounted externally to the gage column, magnetically actuated by the float assembly, with no additional vessel penetrations required.

JMT Series Magnetostrictive Transmitter

4–20 mA continuous

High-accuracy magnetostrictive transmitter for continuous level measurement. Magnetically actuated by the Magnicator float assembly.

Datasheet

RST2™ Magnetic Reed Switch Transmitter

4–20 mA continuous

Reed switch-based transmitter providing continuous 4–20 mA output for remote level indication and control system integration.

Datasheet

SAS-16™ Magnetic Point Level Switch

Point level — SPDT

Magnetically actuated point level switch for alarm and control functions. Hermetically sealed reed switch actuated by the Magnicator float magnet assembly.

Datasheet

RS2™ Magnetic Point Level Reed Switch

Point level — SPDT

Compact magnetic reed switch for point level detection. Simple, reliable actuation by the Magnicator float assembly.

Datasheet

Advantages Over Sight Glasses

Improved Visibility

Wide flag indicators are visible from much greater distances than sight glass — especially with NightStar LED illumination.

Reduced Maintenance

No glass to clean, replace, or re-gasket. Hermetically sealed indicators require no maintenance.

Eliminates Leak Paths

No glass seals means no leak paths — critical for flammable, toxic, or high-pressure service.

Hostile Environments

Suitable for extreme pressures, temperatures, shock, and vibration where sight glasses fail.

Remote Output

Add switches and 4–20 mA transmitters to the same gage column — no additional vessel penetrations.

Patented Magnet Design

Dual-ring Alnico 8 magnets (U.S. Patent 5,743,137) provide the strongest, most focused field of any MLI.

Typical Applications

Refinery process vesselsChemical reactor levelCryogenic storage tanksOffshore platform vesselsBoiler drum levelSeparator level measurementDistillation column levelStorage tank gaugingInterface level detectionHigh-pressure vesselsToxic / flammable serviceDirty / viscous fluids (FlashProof)

Magnicator® sales & application engineering

Contact NCI for model configuration, indicator selection, switches, transmitters, and spare parts.

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