Resistance (RTD) temperature assembly for use in existing thermowells or machinery

  • Thread connection or union nut
  • DIN-style, without thermowell
  • -40…+600°C / +1100°F

OPTITEMP TRA-S34 – Standard version

Resistance (RTD) temperature assembly OPTITEMP TRA-S34 – Standard version

The OPTITEMP TRA-S34 is a threaded RTD sensor assembly without thermowell. The temperature assembly can be mounted to existing thermowells or machine housings by a thread connection or union nut. The RTD is suitable for temperature measurement of liquids, gases and steam up to +600°C / +1100°F. However, it cannot be operated without thermowell.

The OPTITEMP TRA-S34 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 liquids, gases and steam
  • Modular design: threaded standard neck tube for easy exchange under operating conditions
  • Without thermowell, sheath material: 1.4404 / 316L
  • Also suitable for installation into existing thermowells
  • Standard or customised lengths
  • Different connection heads available (IP54…IP68)
  • With optional temperature transmitter
  • Available as intrinsically safe: ATEX, IECEx

Typical applications

  • For installation into existing thermowells as well as bearings or similar machinery in various industries:
    • Chemical and petrochemical
    • Oil and gas
    • Power generation
    • Machinery and apparatus / OEM
    • Iron and steel
    • Pulp and paper

Product details

Alternative product categoriesPotentiometer, Resistance temperature detector, Resistance thermometer, RTD

Technical data

Measurement principlesResistance (RTD)
Measured mediaGases, Liquids, Steam
Measuring pointMachinery, Pipe
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 thermowellNo
Temperature assembly designDIN-style


Certificates/Approvals ExATEX, IECEx

Process connections

Thread connectionsMale:
G½, G¾
M 18 x 1.55 mm
Union nut:
G½, G¾