The Magne-Trac Plus combines a Magne-Trac magnetic level indicator with a Bridle-Trac bypass chamber, in which a customer specified guided wave or non-contact radar may be installed. Although either instrument may be connected to the vessel, Questtec recommends that the bridle functions as the primary chamber. By using the magnetic gauge as the secondary chamber, the customer will have the option to rotate the indicator up to 180 degrees easily in the field. The two chambers may welded or flanged together; QTS recommends installing valves in between the magnetic gauge and bridle chamber so one may be isolated if necessary.



Most frequent questions and answers

Product Features

  • Innovative Flag Design Maximizes Magnetic Field
  • Wide Flags for Enhanced Indicator View
  • Impact Resistant Polycarbonate Indicator Window
  • Corrosion Resistant Moving Parts
  • Wide Variety of Materials
  • Available to ASME 31.1/31.3 Standards

Product Specifications

Magne-Trac Chamber

The chamber may be constructed of any non-magnetic material, including austenitic stainless steel, alloys such as Alloy 20, and plastics. The chamber is typically mounted to the side of the vessel with an inlet and outlet that will allow the liquid level in the chamber to match the liquid level in the vessel, in the same manner that traditional sight glasses work. Magne-Trac chambers are available to ASME 31.1 and 31.3, and utilize flange end closures for float access.

Magne-Trac Float

Standard floats are constructed of thin wall, deep drawn 316 Stainless Steel or Titanium. Optional materials are available. Each float is custom engineered for a specific application and operating process variables. The float houses a magnet array, designed to project a magnetic field through the chamber and to an externally mounted indicator assembly. Variables considered in the construction of a float are dependent on the temperature, pressure, and liquid density, as well as material compatibilities.

Magne-Trac Indicator

The standard indicator consists of anodized aluminum housing, rotating flags, and a clear cover. The standard UV stable Yellow/Black flags are uniquely constructed of high temperature molded nylon. The non-corrosive nature of the material eliminates problems with corrosion often encountered with aluminum flag/stainless steel pins most commonly supplied in the market. Magne-Trac indicators are constructed with a UV scratch resistant polycarbonate window as standard, eliminating nuisance breakage of glass and allowing a high integrity fit. The flags are a wide 1.4″ to enhance viewing. Each flag is assembled around a high temperature rare earth magnet assembly that ensures a latching action to eliminate false indication due to a vibration.

MLI Overview Specifications

Measuring Range12 to 600in (over 50ft consult sales)
Temperature Range-320°F to +1000°F (-196°C / +538°C)
Pressure RangeFull Vacuum to 2800 psig
Specific GravityAs low as 0.35 SG (consult sales for lower)

Materials of Construction

Chamber Materials  (Metal Alloys)316 /316L or 304/ 304 Stainless Steel, Monel, Hastelloy C-276, Alloy 20, and other Non-Magnetic Alloys
Chamber Materials  (Plastics/Composites)PVC, CPVC, AND PVDF
Float MaterialsPer application – 316 SST & Titanium are standard (exotic alloys available)


Indicator Flags1.4” Wide Flag Assembly in Yellow/Black (Additional Colors Available on Request)
Indicator HousingAnodized Aluminum, Stainless Steel
ScaleFt/Inches (Std.), Metric, Percentage, Volume, etc. *Custom Scales Available
Visual IndicationEasily visible from 200 ft.


Float / Standpipe MaterialMinimum Temperature °F (°C)Maximum Temperature °F (°C)
Metallic-325°F [-198°C]750°F [400°C]
PVC-20°F [-28°C]140°F [60°C]
CPVC-20°F [-28°C]200°F [93°C]

Process Connections

Pressure Class RatingsANSI 150#; 300#; 600#; 900#; 1500#; 2500#
Process Connection Sizes½” to 10+ [DN20 TO DN150]
Process Connection TypesMNPT, FNPT, Weldolet®, Sockolet®, Socketweld Flange, Weldneck Flange, Lap Joint Flange; RTJ Flanged, Plain Pipe Stub

Float Minimum Specific Gravity

Float MaterialMinimum Specific Gravity
316/316L SS0.49 SG
Titanium0.37 SG
Monel®0.51 SG
Alloy-20b30.47 SG
Hastelloy® C2760.53 SG
PVC0.79 SG
OtherConsult Sales

Level Transmitter & Alarm Options

Transmitter OptionsMTLT-5000 Magnetostrictive

Guided Wave Radar (contact sales)

Switch OptionsMTLS-1A; MTLS-5A; MTLS-10A; MTLS-PNEU

Temperature Options

High TemperaturesInsulation Blankets, Electric or Steam Tracing, High Temperature Indicators, etc.
Low TemperaturesInsulation Blankets, Cryogenic Insulation, Non-Frost Extensions, Electric or Steam Tracing, etc.


400-00Magne-Trac BrochureProduct Line Brochure
410-03Magne-Trac Plus Model Code GuideData Sheet
410-05Magne-Trac Configuration GuideData Sheet, Magne-Trac, RFQ
430-00Magne-Trac IOMIOMs, Magne-Trac
430-02Multiple Float Installation IOMIOMs, Magne-Trac
420-01Anatomy of a Mag GaugeMagne-Trac, Technical Documents
400-10Flashing SolutionsMagne-Trac, Product Literature
 MLI Data Sheet for MLIData Sheet, Magne-Trac, RFQ
400-04Magne-Trac CatalogBrochures, Product Line Brochure
400-12MagneTrac Optional EquipmentMagne-Trac, Product Literature

Get In touch

(949) 218-0026

available from 8:00 – 4:30 MST





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