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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 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 CAD 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 72in L, 316L 335 312 295 FTW31-A2A2EBxA 36in L, 316L 362 337 319 FTW31-A2A2LBxA 500mm L, 316L 335 312 295 FTW31-A2A2HBxA 1500mm L, 316L 355 331 313 FTW31-A2A2IBxA 3x rod, 316L 72in L, 316L 381 354 335 FTW31-A2A3EBxA 36in L, 316L 408 379 359 FTW31-A2A3LBxA 500mm L, 316L 381 354 335 FTW31-A2A3HBxA 1500mm L, 316L 401 373 353 FTW31-A2A3IBxA Separate instrumentation 5x rod, 316L 72in L, 316L 265 246 233 FTW31-A2A5EB0A 500mm L, 316L 265 246 233 FTW31-A2A5HB0A 1500mm L, 316L 285 265 251 FTW31-A2A5IB0A Please notice that FTW31 does not come with CSA approval!Liquipoint T FTW32
Product / Version Price / pcs. in CAD 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 180in L 367 342 323 FTW32-A2D2EBxA 360in L 489 455 430 FTW32-A2D2FBxA 5000mm L 428 398 377 FTW32-A2D2CBxA 10000mm L 489 455 430 FTW32-A2D2DBxA 3x rope, 316Ti 180in L 414 385 364 FTW32-A2D3EBxA 360in L 535 498 471 FTW32-A2D3FBxA 5000mm L 474 441 417 FTW32-A2D3CBxA 10000mm L 535 498 471 FTW32-A2D3DBxA Please notice that FTW32 does not come with a CSA approval!Prices valid until 30.06.2020 in CAD per unit (not including shipping and applicable sales taxes). 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 electrolytic destruction of the product is avoided.
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 NPT 1½" 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
Dimensions (in mm)
Compact-instrument version with electronic insert
L = Probe length
a) FTW31 (Rod-version)
b) FTW32 (Rope-version)
Installation according to instruction manual
Separate instrument version without electronic insert
L = Probe length
a) FTW31 (Rod-version)
b) FTW32 (Rope-version)
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/0.4 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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