RTD Assemblies

RTD Assemblies Components and Descriptions

        Conax Technologies’s wirewound platinum RTD assemblies feature a wirewound element encased in either a stainless steel or Inconel 600 sheath. The RTD’s nickel leadwires are supported and insulated throughout the sheath with densely compacted high-purity magnesium oxide. This allows the sensor to be bent like a thermocouple except in the tip portion that contains the element.
        Thin film platinum element assemblies (M-style) use a powder-filled tubewell construction with bare leadwire strung through pre-formed MgO insulators and attached directly to the element. This assembly is inserted into a closed-end tubewell, which is then filled with Al2O3 powder and capped with potting compound. Copper and nickel element assemblies (E-style) feature a similar tubewell construction, with Teflon(r)-insulated leadwires brazed to the element. The tubewell is then filled with Al2O3 powder and capped with potting compound. In both cases, the minimum active length is 3″ and the assemblies should not be bent.

Thermocouple Assemblies

Example: RTD43W3-316SS25-T5AL(PG4BL)-12.00”


RTD assemblies can be provided with a wide variety of termination styles and mounting fittings to meet the needs of your application. Conax Technologies also offers numerous sensor tolerances, sheath diameters and sheath materials. This section outlines the key choices needed to specify the correct Conax Technologies part description for your needs. In each case, you will be asked to select options on your right hand:

Thermocouple Assemblies options

sensor tolerance

sheath material and size

termination style

optional mounting configuration

sheath length

lead configuration corresponding to the number of leads your application requires

Addition Details

Conax Technologies RTD assemblies offer a wide variety of terminal head styles to meet application needs. In direct mount models, the sheath is attached to the terminal head using either a W8 fitting or a Conax Technologies manufactured “soft seal” sealing gland. Gland models are provided in different sizes and with various sealant materials to ensure proper function in a wide range of environments. All provided direct mount fittings serve as mounting devices and environmental seals.