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Level Measurement > FS-100 Series

FS-100 Series

FS-100 Series



FS-100 is a spring balanced displacer type level switch.
The pressurized part and electric part are perfectly isolated by magnet coupling system to offer much more safety and durability compared to other mechanical sealing types.
FS-100 can meet tough application with high temperature and high pressure.
Hermetical seal switch is newly added for heavy duty applications.


·  Wide selection range for temperature and pressure.
·  Variety of material selection for displacer, spring and chambers for suitable anticorrosive capability.
·  Perfect isolation between pressurized part and electric compartment by magnetic coupling for high reliability and safety.
·  In addition to watertight construction, pressure tight and intrinsically safe versions are ready to meet hazardous application.
Especially, pressure tight flameproof suitable for Hydrogen atmospher (Ex dIIC T6) is available which eliminates the necessity of safety barriers.


·  Fuel oil tank level control
·  Process control for petrochemical plants
·  Nuclear, thermal, and Hydric power station process control
·  Water treatment plants
·  Oil rig's platform
·  Other liquid level control

Short Specifications

Measuring theory By spring balanced displacer
Measuring object All types of liquids (Viscosity: Max. 600 mPa·s. Liquid without sticking, crystallization, or freezing)
Level measurement: Density 0.45 g/cm3 or more
Interface measurement: Density difference of 0.2 g/cm3 or more
*Number of points for alarm: 1 point
Pressure range Full vacuum to 4.9 MPa
Temperature range -60 to 400°C
(Upto -196°C on request. Consult factory for details)
Process connection
Tank top: 3" flanges (4" for low density)
Tank side chamber:  1" flange
(1)  Water tight construction: equiv. to IP 65
(2)  Flameproof construction: Ex d IIC T6
(CENELEC certified available)
(3)  Intrinsically safe construction: Ex ia IIC T6
(EB3C intrinsically safe relay barrier is to be used.)
Liquid and vapor contact part:    SUS304, SUS316
Displacer:    SUS304, SUS316, SUS316L (Option:MA276, TP35, Monel)
Flange: Carbon steel, SUS304, SUS316, SUS316L
Packing: PTFE, Vortex gasket
Housing: Aluminum alloy
Other material on request
Alarm contacts
Number of point Max. 4 points
Applicable alarm of interface detection is 1 point
Type of switch
Std.:  1 x SPDT Microswitch
Option:  2 x SPDT Microswitch
Hermetically sealed microswitch
Accuracy ・Accuracy: ±10mm (Density 1.0g/cm3)
・Repeatability: ±5mm (Density 1.0g/cm3)
・Reset span: Max.40mm (Density 1.0g/cm3)
*For level detection with water (AMB, ATM).

Catalog Download

For further details, refer to the attached PDF file for the Catalog to download.

FS-100 Catalog PDF

Specifications are subject to change without prior notice.

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