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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 : L=1000mm
Product / Version Price / pcs. in GBP Order code Approval Electronics; Output Sensing Point 1 to 3 4 to 10 11+ Non-hazardous area Separate instrumentation 2x rod, 316L 90.- 84.- 79.- FTW31-A1A2CA0A 3x rod, 316L 112.- 104.- 98.- FTW31-A1A3CA0A 5x rod, 316L 126.- 117.- 111.- FTW31-A1A5CA0A FEW52; PNP 10.8-45VDC 2x rod, 316L 160.- 149.- 141.- FTW31-A1A2CA2A 3x rod, 316L 181.- 169.- 160.- FTW31-A1A3CA2A FEW54; relay 20-253VAC; 20-55VDC 2x rod, 316L 160.- 149.- 141.- FTW31-A1A2CA4A 3x rod, 316L 181.- 169.- 160.- FTW31-A1A3CA4A Non-hazardous area, WHG, leakage-detection Separate instrumentation 2x rod, 316L 108.- 101.- 95.- FTW31-B1A2CA0A 3x rod, 316L 130.- 121.- 114.- FTW31-B1A3CA0A 5x rod, 316L 144.- 134.- 127.- FTW31-B1A5CA0A FEW52; PNP 10.8-45VDC 2x rod, 316L 178.- 165.- 157.- FTW31-B1A2CA2A 3x rod, 316L 200.- 186.- 176.- FTW31-B1A3CA2A FEW54; relay 20-253VAC; 20-55VDC 2x rod, 316L 178.- 165.- 157.- FTW31-B1A2CA4A 3x rod, 316L 200.- 186.- 176.- FTW31-B1A3CA4A ATEX II 2G EEx ia IIC T6, WHG, XA, leakage-detection, note safety instruction (XA) (electrostatic charging) Separate instrumentation 2x rod, 316L 106.- 98.- 93.- FTW31-D1A2CA0A 3x rod, 316L 127.- 118.- 112.- FTW31-D1A3CA0A 5x rod, 316L 142.- 132.- 125.- FTW31-D1A5CA0A FEW58; NAMUR 2x rod, 316L 175.- 163.- 154.- FTW31-D1A2CA8A 3x rod, 316L 197.- 183.- 173.- FTW31-D1A3CA8A Liquipoint T FTW31 : L=2000 mm
Product / Version Price / pcs. in GBP Order code Approval Electronics; Output Sensing Point 1 to 3 4 to 10 11+ Non-hazardous area Separate instrumentation 2x rod, 316L 97.- 90.- 85.- FTW31-A1A2DA0A 3x rod, 316L 119.- 110.- 105.- FTW31-A1A3DA0A 5x rod, 316L 133.- 124.- 117.- FTW31-A1A5DA0A FEW52; PNP 10.8-45VDC 2x rod, 316L 167.- 155.- 147.- FTW31-A1A2DA2A 3x rod, 316L 188.- 175.- 166.- FTW31-A1A3DA2A FEW54; relay 20-253VAC; 20-55VDC 2x rod, 316L 167.- 155.- 147.- FTW31-A1A2DA4A 3x rod, 316L 188.- 175.- 166.- FTW31-A1A3DA4A Non-hazardous area, WHG, leakage-detection Separate instrumentation 2x rod, 316L 115.- 107.- 101.- FTW31-B1A2DA0A 3x rod, 316L 137.- 127.- 120.- FTW31-B1A3DA0A 5x rod, 316L 152.- 141.- 133.- FTW31-B1A5DA0A FEW52; PNP 10.8-45VDC 2x rod, 316L 185.- 172.- 163.- FTW31-B1A2DA2A 3x rod, 316L 207.- 192.- 182.- FTW31-B1A3DA2A FEW54; relay 20-253VAC; 20-55VDC 2x rod, 316L 185.- 172.- 163.- FTW31-B1A2DA4A 3x rod, 316L 207.- 192.- 182.- FTW31-B1A3DA4A ATEX II 2G EEx ia IIC T6, WHG, XA, leakage-detection, note safety instruction (XA) (electrostatic charging) Separate instrumentation 2x rod, 316L 113.- 105.- 99.- FTW31-D1A2DA0A 3x rod, 316L 134.- 125.- 118.- FTW31-D1A3DA0A 5x rod, 316L 149.- 139.- 131.- FTW31-D1A5DA0A FEW58; NAMUR 2x rod, 316L 182.- 170.- 161.- FTW31-D1A2DA8A 3x rod, 316L 204.- 190.- 180.- FTW31-D1A3DA8A Liquipoint T FTW32 : L=5000 mm
Product / Version Price / pcs. in GBP Order code Approval Electronics; Output Sensing Point 1 to 3 4 to 10 11+ Non-hazardous area Separate instrumentation 2x rope, 316Ti 128.- 119.- 113.- FTW32-A1D2CA0A 3x rope, 316Ti 150.- 140.- 132.- FTW32-A1D3CA0A 5x rope, 316Ti 253.- 235.- 223.- FTW32-A1D5CA0A FEW52; PNP 10.8-45VDC 2x rope, 316Ti 198.- 184.- 174.- FTW32-A1D2CA2A 3x rope, 316Ti 220.- 204.- 193.- FTW32-A1D3CA2A FEW54; relay 20-253VAC; 20-55VDC 2x rope, 316Ti 198.- 184.- 174.- FTW32-A1D2CA4A 3x rope, 316Ti 220.- 204.- 193.- FTW32-A1D3CA4A Non-hazardous area, WHG, leakage-detection Separate instrumentation 2x rope, 316Ti 146.- 136.- 129.- FTW32-B1D2CA0A 3x rope, 316Ti 168.- 156.- 148.- FTW32-B1D3CA0A 5x rope, 316Ti 271.- 252.- 238.- FTW32-B1D5CA0A FEW52; PNP 10.8-45VDC 2x rope, 316Ti 216.- 201.- 190.- FTW32-B1D2CA2A 3x rope, 316Ti 238.- 221.- 209.- FTW32-B1D3CA2A FEW54; relay 20-253VAC; 20-55VDC 2x rope, 316Ti 216.- 201.- 190.- FTW32-B1D2CA4A 3x rope, 316Ti 238.- 221.- 209.- FTW32-B1D3CA4A ATEX II 2G EEx ia IIC T6, WHG, XA, leakage-detection, note safety instruction (XA) (electrostatic charging) Separate instrumentation 2x rope, 316Ti 144.- 134.- 127.- FTW32-D1D2CA0A 3x rope, 316Ti 166.- 154.- 146.- FTW32-D1D3CA0A 5x rope, 316Ti 269.- 250.- 236.- FTW32-D1D5CA0A FEW58; NAMUR 2x rope, 316Ti 214.- 199.- 188.- FTW32-D1D2CA8A 3x rope, 316Ti 236.- 219.- 207.- FTW32-D1D3CA8A Liquipoint T FTW32 : L=10000 mm
Product / Version Price / pcs. in GBP Order code Approval Electronics; Output Sensing Point 1 to 3 4 to 10 11+ Non-hazardous area Separate instrumentation 2x rope, 316Ti 157.- 146.- 138.- FTW32-A1D2DA0A 3x rope, 316Ti 179.- 167.- 158.- FTW32-A1D3DA0A 5x rope, 316Ti 282.- 262.- 248.- FTW32-A1D5DA0A FEW52; PNP 10.8-45VDC 2x rope, 316Ti 227.- 211.- 200.- FTW32-A1D2DA2A 3x rope, 316Ti 249.- 231.- 219.- FTW32-A1D3DA2A FEW54; relay 20-253VAC; 20-55VDC 2x rope, 316Ti 227.- 211.- 200.- FTW32-A1D2DA4A 3x rope, 316Ti 249.- 231.- 219.- FTW32-A1D3DA4A Non-hazardous area, WHG, leakage-detection Separate instrumentation 2x rope, 316Ti 175.- 163.- 154.- FTW32-B1D2DA0A 3x rope, 316Ti 197.- 183.- 173.- FTW32-B1D3DA0A 5x rope, 316Ti 300.- 279.- 264.- FTW32-B1D5DA0A FEW52; PNP 10.8-45VDC 2x rope, 316Ti 245.- 228.- 215.- FTW32-B1D2DA2A 3x rope, 316Ti 267.- 248.- 235.- FTW32-B1D3DA2A FEW54; relay 20-253VAC; 20-55VDC 2x rope, 316Ti 245.- 228.- 215.- FTW32-B1D2DA4A 3x rope, 316Ti 267.- 248.- 235.- FTW32-B1D3DA4A ATEX II 2G EEx ia IIC T6, WHG, XA, leakage-detection, note safety instruction (XA) (electrostatic charging) Separate instrumentation 2x rope, 316Ti 173.- 161.- 152.- FTW32-D1D2DA0A 3x rope, 316Ti 195.- 181.- 172.- FTW32-D1D3DA0A 5x rope, 316Ti 298.- 277.- 262.- FTW32-D1D5DA0A FEW58; NAMUR 2x rope, 316Ti 243.- 226.- 213.- FTW32-D1D2DA8A 3x rope, 316Ti 265.- 246.- 233.- FTW32-D1D3DA8A Accessory
Product / Version Price / pcs. in GBP Order code Mounting nut G1-1/2 Hexagon, SW60. Usage: Liquipoint T, Liquicap T, Prosonic M FMU40, Prosonic T FMU30, FMR10, FMR20. 21.60 52014146 Prices valid until 30.06.2020 in GBP 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 WHG approval WHG Z-65.40-360 (DIBt) 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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