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Jerguson® FlashProof ™ Magnicator®

Avoid False Readings in Boiling Fluids, Eliminate Crushed Floats Due to Flashing, or Sticking Floats Due to Dirty Service

The Jerguson FlashProof design addresses two potential problems that may occur with standard level indicators: boiling fluids and flashing vapors.  By employing a larger 3″ Schedule 40 pipe and two internal guide rods, entrained gases that build up under the float can harmlessly escape.  The float is held to one side of the chamber to insure an optimized magnetic field in close proximity to the indicator, transmitter or switches.  This provides an accurate float level and indicator reading.

The Jerguson FlashProof design also addresses problems caused by dirty or viscous services.  The use of an oversized 3″ Schedule 40 chamber creates additional space to prevent the float from binding when dirt, sludge, or wax-like solids are present in the process fluid.  In a standard gage dirty service could potentially bind the float, causing the level to appear unchanged.  Additionally, the bypass zone allows for the gage to be flushed without removing the float from the column.

flashproof cutaway

Boiling Fluids

Boiling fluids can cause the float to sink in a traditional level indicator. This situation is common when there are substantial temperature differences between the fluid in a vessel and the fluid in an indicator chamber. (Think: cold liquid in vessel; hot summer day for indicator.)

Flashing Vapors
Flashing vapors can cause a float to accelerate upwards rapidly, crashing into the top of the chamber due to depressurization.

Dirty Service 


  • ​Ideal for applications where suspended solids can build up and cause float to become “stuck”

  • Oversized chamber with guide rods creates free space for float to move freely without binding against chamber wall

  • Free Space allows gage to be flushed without removing float, reducing downtime, and cost of replacing gasket

boiling fluids.jpg
flashing vapors.jpg
dirty service.jpg

Specification Overview

  • Larger diameter chamber with float guides

  • Complies to ASME B31.1 and ASME B31.3

  • Available with full range of Jerguson indicators, transmitters and switches

  • 3" Schedule 40 pipe chamber as standard

  • Schedule 80 and 120 available for high pressure applications

  • Size Range from 12" to 240" (305mm to 6096mm) vessel centers (Consult factory for longer units)

  • Specific gravity minimum: 0.36

  • Pressure class rating up to 1919 PSIG (132 BarG) @ 100ºF (37ºC) as per ASME B31.3 (Higher pressures are available)

  • Temperature Range: -325ºF to 1000ºF (-198ºC to 538ºC)

The following video depicts the benefits of the FlashProof Magnicator compared to a standard magnetic gage column in a flashing application:

flashproof magnicator
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