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Detect up to five level limits with one probe
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Flexible instrumentation (compact/separate)
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No moving parts
Specs at a glance
Function Level switch for multiple point detection Product liquids as of 10 µS/cm Approval ATEX II 2G EEx ia Measuring points up to 4 measuring points with 5 rods or ropes Product temperature –40 to +100 °C (–40 to + 212 °F) Process pressure –1 to +10 bar (–14.5 to +145 psi) Liquipoint T FTW31
Product / Version Price / pcs. in AUD Order code Electronics; Output Sensing Point Probe Length 1 to 3 4 to 10 11+ FEW52; PNP 10.8-45VDC / FEW54; relay 20-253VAC; 20-55VDC / FEW58; NAMUR 2x rod, 316L 500mm L, 316L 298.00 283.00 268.00 FTW31-A1A2HAxA 1500mm L, 316L 315.00 299.00 284.00 FTW31-A1A2IAxA 2000mm L, 316L 321.00 305.00 289.00 FTW31-A1A2DAxA 3x rod, 316L 500mm L, 316L 337.00 320.00 303.00 FTW31-A1A3HAxA 1500mm L, 316L 354.00 336.00 318.00 FTW31-A1A3IAxA 2000mm L, 316L 360.00 342.00 324.00 FTW31-A1A3DAxA Separate instrumentation 5x rod, 316L 1500mm L, 316L 255.00 243.00 230.00 FTW31-A1A5IA0A Liquipoint T FTW31
Product / Version Price / pcs. in AUD Order code Electronics; Output Sensing Point Probe Length 1 to 3 4 to 10 11+ FEW52; PNP 10.8-45VDC / FEW54; relay 20-253VAC; 20-55VDC / FEW58; NAMUR 2x rod, 316L 500mm L, 316L 298.00 283.00 268.00 FTW31-A1A2HAxA 1500mm L, 316L 315.00 299.00 284.00 FTW31-A1A2IAxA 2000mm L, 316L 321.00 305.00 289.00 FTW31-A1A2DAxA 3x rod, 316L 500mm L, 316L 337.00 320.00 303.00 FTW31-A1A3HAxA 1500mm L, 316L 354.00 336.00 318.00 FTW31-A1A3IAxA 2000mm L, 316L 360.00 342.00 324.00 FTW31-A1A3DAxA Separate instrumentation 5x rod, 316L 1500mm L, 316L 255.00 243.00 230.00 FTW31-A1A5IA0A Liquipoint T FTW32
Product / Version Price / pcs. in AUD Order code Electronics; Output Sensing Point Probe Length 1 to 3 4 to 10 11+ FEW52; PNP 10.8-45VDC / FEW54; relay 20-253VAC; 20-55VDC / FEW58; NAMUR 2x rope, 316Ti 5000mm L 374.00 355.00 337.00 FTW32-A1D2CAxA 10000mm L 426.00 405.00 383.00 FTW32-A1D2DAxA 3x rope, 316Ti 5000mm L 413.00 393.00 372.00 FTW32-A1D3CAxA 10000mm L 465.00 442.00 419.00 FTW32-A1D3DAxA Prices valid until 30.06.2020 in AUD per unit (not including shipping and applicable sales tax). See
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Application
Liquipoint T sensors are used in conductive liquids for determining point levels. Depending on the number of measuring points, measuring tasks such as overspill protection, dry running protection, two-point control of pumps or multiple point detection can be implemented within an existing process connection.
Function
An alternating voltage exists between the rod probes in an empty tank. As soon as the conductive liquid in the tank creates a connection between the ground rod probe and the maximum rod probe, for example, a measurable current flows and the Liquipoint T switches.
By using alternating voltage, corrosion of the probe ends and electroytic destruction of the product is avoided. As the system is designed as a closed potential-free circuit between the probe rods and the electronics, the materials used in the tank walls is unimportant and there is no danger if the probe rods are touched during operation.
Application Examples
Probes with integrated electronic insert (compact instrument version)
The measuring system consists of:
- FTW31, FTW32 with two/three rods or ropes and an electronic insert
- Control units, switches or signal transmitters. e.g. process control systems PLC, relays or NAMUR isolating amplifier according to IEC 60947-5-6
Probes without integrated electronic insert (separate instrument version)
The measuring system consists of:
- FTW31, FTW32 with two to five rods or ropes
- Nivotester FTW325 or FTW470 Z
- Control units, switches or signal transmitters, e.g. process control systems PLC, relays, etc.
The number of Nivotester depends on the number of measuring points (e.g. 4 measuring points with 2 Nivotester FTW).
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Technical data
GeneralVersion Compact version: two/three (Always ∆S-mode - only three rod-/rope versions) rods or ropes;
Separate version (With integrated line monitoring - in combination with level limit switch FTW325): two/three/five rods or ropes
Sensor length Rod: 100 to 4000 mm (4" to 157");
rope: 250 to 15000 mm (10" to 590")
Minimum conductivity ≥10 µS/cm Cable specification Use standard cable (25 Ω per core) Operating conditionsMedium temp. –40 to +100 °C (–40 to +212 °F) Ambient temp. –40 to +70 °C (–40 to +158 °F) Pressure –1 to +10 bar (–14.5 to +145 psi) Ingress Protection IP 66 Process connection G1½" MaterialElectrodes Rods: 1.4404 (316L)/insulation: PP; ropes: 1.4571 (316TI)/insulation: FEP; weight: 1.4435 (316L) Process connection PPS Housing F16 For compact instrument version;
housing: PBT;
hat: PPS;
adapter: PBT
Housing F24 For separate instrument version;
housing: PPS;
hat: PBT
Approvals (Compact instrument version)Ex approval ATEX II 2G EEx ia IIC T6 with FEW58 Approvals (Separate instrument version)Ex approval ATEX II 2G EEx ia IIC T6 Dimensions (in mm)
Compact-instrument version with electronic insert
L = Probe length
FTW31 (Rod-version)
FTW32 (Rope-version)
Rod and rope version with G1½"
Installation according to instruction manual
Separate instrument version without electronic insert
L = Probe length
FTW31 (Rod-version)
FTW32 (Rope-version)
Rod and rope version with G1½"
Installation according to instruction manual
Electrical connection – Probes with electronic insert
(compact instrument version)Electronic insert FEW52Supply voltage U = 10.8 to 45 V DC Current consumption Max. 25 mA Load connection Open collector; PNP Switching voltage max. 45 V Connectable load Temporary (max. 1 sec): max. 2 A
Continuous: max. 200 mA;
Protected against reverse polarity Yes 
Connecting the FEW52 electronic insert
F: Fine-wire fuse, dependent on connected load
R: Connected load, e.g. PLC, PLS, relay
M: Ground connection to protective earth (PE)
a) Mains
Electronic insert FEW54Supply voltage 20 to 55 V DC or
20 to 253 V AC, 50/60 Hz
Current consumption 60 mA Peak inrush current Max. 2 A, max. 400 μs Pulse frequency Approx. 1.5 s Output Two potential-free changeover contacts (DPDT) Contact load capacity U~ max. 253 V, I~ max. 4 A, U = 30 V/4 A; 150 V/ 0.2 A Power consumption < 2.0 W 
Connecting the FEW54 electronic insert
F1: Fine-wire fuse, 200 mA, semi-time lag
F2: Fine-wire fuse to protect the relay contact, load-dependent
M: Ground connection to protective earth (PE)
a) Mains
b) + c) Potential-free changeover contacts
d) Vessel
Electronic insert FEW58Supply voltage see Technical data of connected isolating amplifier according to IEC 60947-5-6 (NAMUR). Use with a separate contactor according to IEC 60947-5-6 (NAMUR); output signal leap of high to low electricity on limit (H-L-flank). Two-wire signal transfer H-L-edge 2.2 to 6.5 mA / f0.4 to 1.0 mA Output signal of damaged sensor <1.0 mA On access to a multiplexer the cycle time is to adjust on min. 2 sec. 
a) IEC 60947-5-6 (NAMUR)
b) e.g.: FTL325N
Electrical connection – Probes without integrated electronic insert
(separate-instrument version)
For evaluation one or more FTW325 processor units are needed.
Separate instrumentation for three-rod- or rope-probes with cable monitoring.
*1 = Printed circuit board for cable monitoring
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