Conductivity point level switch for multiple point detection

Conductive level switch for multiple point detection

Liquipoint T FTW31 / FTW32

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    • Detect up to five level limits with one probe

    • Flexible instrumentation (compact/separate)

    • 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 / VersionPrice / pcs. in USDOrder code
    Electronics; OutputSensing PointProbe Length1 to 34 to 1011+
    FEW52; PNP 10.8-45VDC / FEW54; relay 20-253VAC; 20-55VDC / FEW58; NAMUR2x rod, 316L72inch L, 316L222.-206.-195.- FTW31-A2A2EBxA
    36inch L, 316L239.-223.-211.- FTW31-A2A2LBxA
    500mm L, 316L222.-206.-195.- FTW31-A2A2HBxA
    1500mm L, 316L235.-218.-207.- FTW31-A2A2IBxA
    3x rod, 316L72inch L, 316L252.-234.-221.- FTW31-A2A3EBxA
    36inch L, 316L269.-251.-237.- FTW31-A2A3LBxA
    500mm L, 316L252.-234.-221.- FTW31-A2A3HBxA
    1500mm L, 316L265.-246.-233.- FTW31-A2A3IBxA
    Separate instrumentation5x rod, 316L72inch L, 316L175.-163.-154.- FTW31-A2A5EB0A
    500mm L, 316L175.-163.-154.- FTW31-A2A5HB0A
    1500mm L, 316L189.-175.-166.- FTW31-A2A5IB0A
    Please notice that FTW31 does not come with CSA approval!

    Liquipoint T FTW32

    Product / VersionPrice / pcs. in USDOrder code
    Electronics; OutputSensing PointProbe Length1 to 34 to 1011+
    FEW52; PNP 10.8-45VDC / FEW54; relay 20-253VAC; 20-55VDC / FEW58; NAMUR2x rope, 316Ti180inch L243.-226.-214.- FTW32-A2D2EBxA
    360inch L323.-301.-284.- FTW32-A2D2FBxA
    5000mm L283.-263.-249.- FTW32-A2D2CBxA
    10000mm L323.-301.-284.- FTW32-A2D2DBxA
    3x rope, 316Ti180inch L273.-254.-241.- FTW32-A2D3EBxA
    360inch L354.-329.-311.- FTW32-A2D3FBxA
    5000mm L314.-292.-276.- FTW32-A2D3CBxA
    10000mm L354.-329.-311.- FTW32-A2D3DBxA
    Please notice that FTW32 does not come with a CSA approval!

    Prices valid until 30.11.2017 in USD per unit (not including shipping and applicable sales tax). See
    Endress+Hauser Terms and Conditions

  • 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)

    Level switches Liquipoint T FTW31 / FTW32 - Installation example

    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)

    Level switches Liquipoint T FTW31 / FTW32 - Installation example 2

    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).

  • Technical data

    General
    Version

    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 conditions
    Medium 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"
    Material
    Electrodes 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

    Level switch - FTW31 - FTW32 - Dimensions 1

    L = Probe length

     

    a) FTW31 (Rod-version)

    b) FTW32 (Rope-version)

     

    Installation according to instruction manual

    Separate instrument version without electronic insert

     

    Level switch - FTW31 - FTW32 - Dimensions 2

    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 FEW52
    Supply 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
    Level switch - FTW31 - FTW32 - Connecting the FEW52 electronics

    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 FEW54
    Supply 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

     

    Level switch - FTW31 - FTW32 - Connecting the FEW54 electronics

    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 FEW58
    Supply 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.
    Level switch - FTW31 - FTW32 - Connecting the FEW58 electronics

    a) IEC 60947-5-6 (NAMUR)

    b) e.g.: FTL325N

    Electrical connection – Probes without integrated electronic insert
    (separate-instrument version)

    Level switch - FTW31 - FTW32 - Connecting to a separate electronic unit

    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

  • More documents for FTW31
    More documents for FTW32