Flow switch for monitoring of mass flow in hygienic design

Flow switch for monitoring of mass flow in hygienic design

Flowphant T DTT35

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    • On-site display

    • High reproducibility and long-term stability

    • Large turndown


    Specs at a glance

    Medium Liquids
    Measuring range 0.03 to 3 m/s (0.1 to 9.84 ft/s)
    Medium temperature –20 to +85 °C (–4 to +185 °F)
    Process pressure 0 to +100 bar (0 to 1450 psi) at 20 °C (68 °F)

    Flowphant DTT35

    Product / VersionPrice / pcs. in USDOrder code
    Process Connection ,
    Insertion Length L; Diameter D
    Power Supply; OutputElectrical Connection1 to 34 to 1011+
    Clamp ,
    L=30mm /
    50mm / 100mm; D=6mm
    18-30VDC; 1x switch PNPPlug M12401.-373.-353.- DTT35-A1A111xxxxAB
    Plug ISO4400 M16x1.5 / Plug ISO4400 NPT1/2427.-397.-376.- DTT35-AxA111xxxxAB
    18-30VDC; 2x switch PNPPlug M12427.-397.-376.- DTT35-A1B111xxxxAB
    18-30VDC; switch PNP + 4-20mAPlug M12488.-454.-430.- DTT35-A1C111xxxxAB
    Varivent, L=30mm / 50mm / 100mm; D=6mm18-30VDC; 1x switch PNPPlug M12454.-422.-399.- DTT35-A1A111xxxxAB
    Plug ISO4400 M16x1.5 / Plug ISO4400 NPT1/2480.-446.-422.- DTT35-AxA111xxxxAB
    18-30VDC; 2x switch PNPPlug M12480.-446.-422.- DTT35-A1B111xxxxAB
    18-30VDC; switch PNP + 4-20mAPlug M12541.-503.-476.- DTT35-A1C111xxxxAB
    Plug and cable to be ordered as 'accessory'


    Product / VersionPrice / pcs. in USDOrder code
    Cable M12x1 l=5m 5m cable 4x 0.34 mm2, molded PVC angled connector, M12x1 connector screw Cu Sn/Ni, IP67.14.61 51005148
    Configuration kit TXU10- for PC-programmable devices. set-up programme+interface cable for PC with USB-Port. 4 pin plug + ReadWin2000149.23 TXU10-AA

    Prices valid until 31.12.2020 in USD per unit (not including shipping and applicable sales tax). See
    Endress+Hauser Terms and Conditions

  • Application

    The Flowphant T DTT35 is a flow switch (surface quality Ra ≤0.8 μm (31.5 μin)) for monitoring, displaying and measuring relative mass flow rates of liquid media in the range from 0.03 to 3 m/s (0.1 to 9.84 ft/s). Application examples include: Monitoring cooling water circulation systems of pumps, turbines, compressors and heat exchangers and filter monitoring in the beverage industry.


    The device measures the mass flow of a liquid medium with the calorimetric measurement method. The calorimetric measuring principle is based on cooling a heated temperature sensor. Heat is removed from the sensor by forced convection due to medium flowing by. The extent of this heat transfer depends on the medium velocity and the difference in temperature between the sensor and medium (King's law). The higher the velocity or the mass flow of the medium, the greater the temperature sensor cooling.

    Application example

    Flow switch - Application example

    The Flowphant monitors the flow in a cooling circuit and signals when flow drops below a minimum flow rate.

  • Technical data

    Measurement range 0 to 100 %; resol. 1 %; 0.03 to 3 m/s (0.1 to 9.84 ft/s) for liquids
    Output signal 1 × PNP, 2 × PNP or 1 × PNP with analog output for flow and temperature
    Voltage drop PNP ≤2 V
    Overload protection Automatic testing
    Performance characteristics
    Reference conditions According to DIN IEC 60770/61003
    Measured error Switch point and display 0.2 %
    Long-term drift ≤0.5 % per year under reference operating conditions
    Sensor reaction time 6 to 12 s
    Response time switch output 100 ms
    Operating conditions
    Medium temperature –20 to +85 °C (–4 to +185 °F), 130 °C (266 °F) max. 1h (no measuring at temperatures > 85 °C (185 °F))
    Ambient temperature –40 to +85 °C (–40 to +185 °F)
    Degree of protection IP 65 (complete housing)
    Power supply
    Supply voltage Ub 18 to 30 V DC, reverse polarity protection
    Current consumption Without load < 100 mA at 24 V DC
    EMC Interference emiss. as per IEC 61326 Series, class B electrical equipment, interference immunity as per IEC 61326 Series, app. A (industrial use) and NAMUR Recomm. NE 21
    Operating elements 3 buttons or PC and ReadWin® 2000
    Materials 316L (process connection, protection tube, housing)
    Surface quality a ≤ 0.8 µm (31.5 μin)

    Dimensions in mm (inches)


    Hygienic Flow switch - Dimensions

    L = sensor length 30 mm, 50 mm, 100 mm; D = 6 mm


    Installation according to instruction manual

    Process connection

    Hygienic Flow switch - Process connections

    a) DB (CLAMP 1")

    b) DL (CLAMP 2")

    c) LB (Varivent F)

    d) LL (Varivent N)



    Process connections


      TRI-CLAMP® / Metal to metal Connections


    ISO 2852 DN25-38 (1 to 1½"), 316L, 3A, DIN 32676 DN25-40


    ISO 2852 DN40-51 (2"), 316L, 3A, DIN 32676 DN50


    Conical metal-metal G ½", 316L

      Hygienic connections


    APV-Inline DN50, PN40, 316L, 3A


    Varivent® F Pipe DN25-32, PN40, 316L, 3A


    Varivent® N Pipe DN40-162, PN40, 316L, 3A


    DIN 11851, DN25, PN40, 316L, 3A


    DIN 11851, DN40, PN40, 316L, 3A


    DIN 11851, DN50, PN40, 316L, 3A

    Electrical connection

    Hygienic Flow switch - Connecting

    DC voltage version with M12×1 connector

    A1:  1 × PNP switch output

    A2:  2 × PNP switch outputs R1 and (1) (R2)

    A2': 2 × PNP switch outputs R1 and (1)
    (diagnosis/break contact with adjustment „DESINA")

    A3:  PNP switch output, additional analog output


    DC voltage version with valve plug M16×1.5" or NPT½"

    B :  1 × PNP switch output

  • More documents for DTT35