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Level Magnetic Level GaugeMAG GAUGE FM4000NEW

FM4000 PDF

*Specifications are subject to change without prior notice.

The FM4000 series metal tube level gauges are improved versions of the FM-1000 series level gauges that Tokyo Keiso has been manufacturing for many years.
Liquid level is indicated by rotating flappers in an indicator by the action of a magnet integrated in a float.
Alarm switches and/or analog output (4 to 20 mA DC) transmitters can be additionally provided for on-site checking and remote monitoring and control purposes.
Specifications for PVC or fluorocarbon resin linings are the same as those for the FM-1000 series.


  • · Metal tube (FM4100 to FM4800)

    All pressure-resistant parts and wetted parts are made of metal and hence free from breakage or liquid leakage.

  • · Clear level indication

    Fluorescent color flappers enable easy observation of liquid levels even from a distance. Indicators are free from blurs and smudges that are common with glass gauges.

  • · Three functions by a single gauge (on-site indication, alarm, and level transmission)

    In addition to on-site indication, an alarm switch and an analog output (4 to 20 mA DC) transmitter can be additionally provided for minimizing the total cost of level control.

  • · Operable under harsh conditions

    Pressure: Max. 40 MPa
    Liquid temperature: −196 to +400℃
    Measurable liquid density: Min. 0.39 g/cm³
    Interface measurement: Density difference 0.2 g/cm³ and density sum 1.2 g/cm³ or higher
    (These gauges cannot withstand the combination of maximum values.)

  • · Manufactured to meet customers’ specifications

    Gauges can be manufactured to meet customers’ specifications such as connection size, measurement range, density, and vent and drain designs. Contact us for details.

  • · Certification for high-pressure gases

    Gauges certified for high-pressure gases are available on request (up to 9.9MPa).
    Contact us for details. (The actual structure may differ from the drawing.)

  • · High-performance analog output (4 to 20 mA DC) transmitter using magnetostrictive effect

    High-precision analog output (4 to 20 mA DC) transmitter using the magnetostrictive effect can be additionally provided. Conforms to IECEx, ATEX explosion-proof, and HART7.

  • · Explosion-proof alarm switch

    Conforms to IECEx and ATEX explosion-proof.

Short Specifications

Measuring object Liquids without sticking or freezing at 600 mPa・s or below
Measuring range Max. 4900 mm
Min. 250 mm
Flapper pitch 10 mm
Indication accuracy ±15 mm
Temperature -196 to +400℃
pressure Max. 40 MPa
SUS304, SUS316, SUS316L, Other special materials
SUS316L, Pure titanium JIS type 2, Titanium alloy (Ti-6Al-4V)
Process connection
Flange standard: 
JIS 10K, JIS 20K, ASME class 150, ASME class 300,
JPI class 150, JPI class 300, and others
Options · Alarm switch specifications
· Transmitter (4 to 20 mA DC) specifications(Magnetostrictive sensor type)