Temperature switch for measurement of process temperatures

Temperature switch for monitoring of process temperatures

Thermophant T TTR31

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    • High reproducibility and long-term stability

    • Stainless steel housing 316L

    • Fast response times without reduced tip


    Specs at a glance

    Temperature range –50 to +150 °C (–58 to 302 °F)
    Display 4 digit, 14 segments display with color change
    Immersion length 30 mm, 50 mm, 100 mm, 200 mm (1.18",1.97", 3.94", 7.87")
    Response time <1.0 s (T50); <2.0 s (T90)
    Sensor ⌀ 6 mm (0.24")
    Accuracy <0.1 %

    Thermophant T TTR31

    Product / VersionPrice / pcs. in USDOrder code
    Process Connection , LengthPower Supply; OutputElectrical Connection1 to 34 to 1011+
    G 1/2" / 1/4" / NPT 1/2" / 1/4"

    12-30VDC; 1x switch PNPPlug M12269.-250.-237.- TTR31-A1A11xxxxxAB
    Plug ISO4400 NPT1/2269.-250.-237.- TTR31-A3A11xxxxxAB
    12-30VDC; 2x switch PNPPlug M12291.-271.-256.- TTR31-A1B11xxxxxAB
    12-30VDC; switch PNP + 4-20mAPlug M12343.-319.-302.- TTR31-A1C11xxxxxAB
    W/o, compr. fitting 316L, L=>100mm nsertion length compr. fitting to order separately.

    12-30VDC; 1x switch PNPPlug M12273.-254.-241.- TTR31-A1A11xAA2EAB
    Plug ISO4400 NPT1/2273.-254.-241.- TTR31-A3A11xAA2EAB
    12-30VDC; 2x switch PNPPlug M12296.-275.-260.- TTR31-A1B11xAA2EAB
    12-30VDC; switch PNP + 4-20mAPlug M12347.-323.-306.- TTR31-A1C11xAA2EAB
    Plug and cable to be ordered as 'accessory'. Please specify the right code for the immersion length.


    Product / VersionPrice / pcs. in USDOrder code
    Collar welded socket d6 PEEK + screw moveable with sealing taper, washer + pressure screw G1/2, material of wetted parts: 316L, PEEK, max. Prozessdruck: 10 bar (145 psi)105.88 51004751
    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 Thermophant T TTR31 is a temperature switch for the monitoring, display and control of process temperatures and is available with a wide range of process connections.


    A platinum sensor located at the measuring tip changes its resistance value depending on the temperature. This resistance value is recorded electronically. The conversion of the resistance value into a temperature measurement signal is defined by the international standard IEC 751.

    Application example

    Temperature switch Thermophant T TTR31 - INStallation example

    The Thermophant detects the temperature in the vessel and monitors the compliance with limit values.

  • Technical data

    Supply voltage
    Supply voltage 12 to 30 V DC (reverse polarity protection)
    Current consumption Without load < 60 mA, with reverse polarity protection
    Output signal 1 or 2 × PNP or PNP with 4 to 20 mA
    Voltage drop PNP ≤2 V
    Overload protection Automatic testing of switching current
    Performance characteristics
    Reference conditions According to DIN IEC 60770/61003
    Measured error Electronics max. 0.2 K or 0.16 % sensor Class A
    Long-term drift ≤0.1 % per year
    Sensor response time T50 = < 1.0 s; T90 = < 2.0 s
    Analog output Non-linearity ≤ 0.2 %
    Sensing element 1 × Pt100, four-wire
    Tolerance Class A to IEC 751
    Medium temperature –50 to +150 °C (–58 to 302 °F)
    Diameter 6 mm (0.24”)
    Operating conditions
    Ambient temperature –40 to +85 °C (–40 to +185 °F)
    Protection IP 65 (complete housing)
    EMC Interference emiss. as per IEC 61326 Series, class B electrical equipment, interference immunity as per IEC 61326 Series, app. A (indust. use) and NAMUR Recomm. NE 21
    Process connection and protection pipe

    316L / Ra ≤ 0.8 µm (31.5 μin);

    housing 316L

    Operating elements 3 buttons or PC and software

    Dimensions in mm (inches)


    Temperature switch Thermophant T TTR31 - Dimensions

    a) M12×1

    b) NPT½" valve plug


    L = sensor length 30 mm/50 mm/100 mm/200 mm (1.18"/1.97"/3.94"/7.87")


    Installation according to operation instructions

    Process connections

    Temperature switch Thermophant T TTR31 - Process connections

    a) AA (Without*)

    b) DE (ANSI NPT½")

    c) DA (ANSI NPT¼")

    d) AE (ISO 228 G½" A, 316L)

    e) AB (ISO 228 G¼" A, 316L)


    * For mounting with welding boss or compression fitting: L ≥100 mm (3.94")

    Electrical connection

    Temperature switch Thermophant T TTR31 - Electrical connection

    DC Voltage version with M12 connector

    A1: 1 × PNP switch output

    A2: 2 × PNP switch output

    A3: PNP switch output with additional analog output


    DC Voltage version with NPT½" valve plug

    B: 1 × PNP switch output

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