FST 4000 Series

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.
Very small flow rate can be covered:  Min. 0 - 0.5 L/h [Water] can be measured.  
 Alarm output option available:    In addition to local indication type, alarm output version is also available.
 Compact design:   Easy installation onto instrument panel.
 Safety for high temperature and pressure: All metallic material construction covers tough applications!


Method of
Torque tube type displacer
Measuring objects 1) Level measurement, 2) Interface measurement, 3) Density measurement
Liquid density
1) 0.2 to 1.5g/cm3(for level measurement)
2) Difference of density of 2 liquids: To be more than 0.1g/cm3(for interface measurement)
3) Minimum density span 0.2 (Density measurement)
Measuring range Max. 0 to 3000mm
Min. 0 to 300mm
Temperature range -196 to 400°C
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, MONEL
Bonnet: SCPH2, SCS13A, SCS14A, SCS16A, NW0276
Chamber: Carbon steel, SUS304, SUS316, SUS316L
NW0276, MONEL, PVC, etc.
Displacer: SUS304, SUS316, SUS316L
NW0276, MONEL, PVC, etc.
Transmitter housing: ADC12
Indication Line 1 Function indication in 4 digits
Line 2 Data indication in 4 digits
Line 3 Bar graph in percent
Output/Supply voltage 1) 4 to 20 mA DC, 2 wire system with HART (version 6) / UB: 8 to 40 VDC
2)FOUNDATION Fieldbus / DC9 - 32V
Accuracy ± 0.5 %F.S (Based on mass conversion correction at factory calibration)
Protection class: IP67
Flameproof: TIIS Exd II CT6 (under application), ATEX & IECEx Exd II CT6, KOSHA, NEPSI
Intrinsically safe: TIIS Ex ia II CT6 (under application), ATEX & IECEx Ex ia II CT6, KOSHA, NEPSI
Others Functional safety: SIL2 compatible with IEC61508
RoHS Directive: Complied with