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

  • Weld-in connection
  • DIN-style based on form 4, barstock thermowell with tapered tip
  • -40…+600°C / +1100°F

OPTITEMP TRA-T30 – Standard version

Resistance (RTD) temperature assembly OPTITEMP TRA-T30 – Standard version

The OPTITEMP TRA-T30 is a weld-in RTD sensor assembly with a tapered barstock thermowell (based on form 4). The temperature assembly for advanced requirements is suitable for applications in pipes, tanks or reactors where flange or thread connections are no longer sufficient (e.g. in steam distribution systems). Its barstock 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. The RTD is designed for temperature measurement of solids, liquids, gases and steam up to +600°C / +1100°F.

The OPTITEMP TRA-T30 features a modular design with a threaded standard 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: threaded standard neck tube for easy exchange under operating conditions
  • Thermowell material: 1.4404 / 316L, 1.4571 / 316Ti, 1.7335 / 13CrMo44, 1.0460 / C22.8
  • 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
  • Also suitable for temperature measurement in cooling lines, requiring tightness and safety of the process connection
  • Suitable for applications where assemblies complying with DIN standards are required
  • Primarily used in power generation and for temperature measurement in auxiliary and supply circuits in various industries such as:
    • Chemical and petrochemical
    • Oil and gas
    • Machinery and apparatus / OEM
    • Iron and steel
    • Pulp and paper

Case studies

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 configuration3-wire, 4-wire
Temperature sensor connection type optionCeramic terminal block, Flying wires, Temperature transmitter
Assembly with thermowellYes
Temperature assembly designDIN-style
Thermowell form (according to DIN 43772)Form 4
Thermowell tip designTapered
Thermowell typeBarstock
Thermowell diameters24 mm / 0.94"


Certificates/Approvals ExATEX, IECEx

Process connections

Weld-in connectionsDiameter: 24 mm / 0.95"
Fitting: 48x50 mm / 1.89x1.97"

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