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Level Displacer type Level TransmitterFST4000 Series

FST4000 Series PDF

*Specifications are subject to change without prior notice.

FST4000 is a torque tube displacement type level indicating transmitter with intelligent data processing function.
Through 18 years of field proven experiences accumulated by the existing model FST-3000, FST4000 has intensified its reliability by adding such features as SIL2 compatible functional safety, ATEX flameproof and field bus communication of FOUNDATION Fieldbus.

Varieties of materials and wide range of pressure ratings are available to meet various applications such as high pressure and temperature boilers as well as low temperature down to minus 196℃ of liquefied gases.

Standard Specifications

Detection Method Torque tube type displacer
Liquid density
Level measurement: 
0.2 to 1.5g/cm³
Interface measurement: 
Density difference between 2 liquids is more than 0.1 g/cm³
Density measurement: 
Min. density span is 0.2 g/cm³
Measuring range 3000mm max.
300mm min.
Temperature range -196 to +450℃
Pressure class ASME class 150,300,600,1500 and 2500
Connection size External chamber type: 1-1/2 or 2 inch flange
Internal chamber type: 3 or 4 inch flange
Torque tube: 
SUS316L, NW0276, NCF600
SCPH2, SCS13A, SCS14A, SCS16A, NW0276
Carbon steel, SUS304, SUS316, SUS316L, NW0276
SUS304, SUS316, SUS316L, NW0276, MONEL
Transmitter housing: 
Local indication LCD display
Output /
Power supply
4-20mA DC, 2wire system with HART® Version6 / UB 8 to 40V DC
FOUNDATION Fieldbus / 9 to 32V DC
Accuracy ±0.5% F.S.
Based on mass conversion correction at factory calibration
Protection class IP67, JIS C 0920 equivalent to IEC 60529
proof classification
Flame proof: 
TIIS Ex d ⅡC T6...T1
ATEX & IECEx Ex db h ⅡC T6...T1 Ga / Gb
Intrinsically safe: 
ATEX & IECEx Ex ia ⅡC T6...T1
Functional safety: 
SIL2 compatible with IEC 61508
RoHS Directive complied with