Resistance (RTD) temperature assembly for higher flow velocities and pressures

  • Weld-in connection
  • ASME-style, barstock thermowell with straight tip
  • -40…+600°C / +1100°F

OPTITEMP TRA-TW58 – Standard version

Resistance (RTD) temperature assembly OPTITEMP TRA-TW58 – Standard version

The OPTITEMP TRA-TW58 is a weld-in RTD sensor assembly with a straight barstock thermowell. The temperature assembly for advanced requirements is suitable for applications in pipes, tanks or reactors where flange or thread connections are no longer sufficient. Its thermowell also features a much higher mechanical stress resistance than welded multipart thermowells, making it particularly useful in applications with higher flow velocities and pressures (e.g. in the petrochemical or oil and gas industry). The RTD is designed for temperature measurement of solids, liquids, gases and steam up to +600°C / +1100°F

The OPTITEMP TRA-TW58 features a modular design with a threaded neck tube that can be exchanged easily, even under operating conditions. This makes the temperature assembly very flexible. If it has been damaged from the outside, servicing can be carried out without process shut down. The resistance temperature device can be combined with most thermowells. It is available with ATEX and IECEx approvals.

Product highlights

  • Temperature measurement of solids, liquids, gases and steam
  • Modular design: Flexible union neck tube or threaded DIN neck tube for easy exchange under operating conditions
  • Thermowell material: 1.4404 / 316L or 1.4571 / 316Ti
  • Standard or customised lengths
  • Different connection heads available (IP54…IP68)
  • With optional temperature transmitter
  • Available as intrinsically safe (Ex i) and flameproof (Ex d): ATEX, IECEx

Typical applications

  • Applications with advanced requirements
  • Temperature measurement of media requiring high mechanical stress resistance
  • Suitable for applications where assemblies complying with ANSI standards are required
  • Primarily used in the chemical or petrochemical industry, the oil and gas industry as well as in industries such as:
    • Machinery and apparatus / OEM
    • Iron and steel
    • Pulp and paper

Product details

Product categoryResistance (RTD) temperature assembly
Alternative product categoriesPotentiometer, Resistance temperature detector, Resistance thermometer, RTD

Technical data

Product typeTemperature assembly
Measurement principlesResistance (RTD)
Measured mediaGases, Liquids, Solids, Steam
Measuring pointPipe
Measuring insert typeReplaceable spring loaded mineral isolated measuring insert OPTITEMP TR 100
Measuring insert replaceableYes
RTD element type1 x Pt100, 2 x Pt100
RTD configuration2-wire, 3-wire, 4-wire
Temperature sensor connection type optionCeramic terminal block, Flying wires, Temperature transmitter
Assembly with thermowellYes
Temperature assembly designASME-style
Thermowell tip designStraight
Thermowell typeBarstock
Thermowell diameters19 mm / 0.75", 23 mm / 0.90"


Certificates/Approvals ExATEX, IECEx

Process connections

Weld-in connectionsDiameter: 26.7 mm / 1.1", 33.4 mm / 1.3"

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