Displacer type Level Transmitter
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 196J of liquefied gases.


Short Specification

Method of measurement Torque tube type displacer
Objects to be measured and measuring range 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 400XC
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 G8 to 40 VDC
2) FOUNDATION Fieldbus / DC1032V
Accuracy 0.5 %F.S (Based on mass conversion correction at factory calibration)
Enclosure Protection class: IP67
Flameproof: TIIS Exd IICT6(under application), ATEX & IECEx Exd II CT6
Intrinsically safe: TIIS Ex ia IICT6(under application), ATEX & IECEx Ex ia II CT6
Others Functional safety: SIL2 compatible with IEC61508
RoHS Directive: Complied with

Detailed specification and dimension are available from the following PDF icon !!
FST-4000 Series
PDF [183KB]