RTD Assemblies + Thermowells

Part Numbering System

After locating a figure and part number in the below tables, you can fine tune the sensor for your application. If you require an American curve sensor and not the European curve, change the “E” to an “A”  in the part number. If you require a 500 Ω  and not the standard 100 Ω sensor, change the “11”  in the part number to “51”. 1000 Ω sensors can be ordered by changing the “11”  to an “101”. Substitute any “X” and “Y” characters with your length requirements. RTDs are provided in four wire configurations as standard. This is the most accurate configuration.

Note: if you are using a transmitter you may be only able to use a three wire sensor. This can be designated by changing the “4” in the part number to a “3”. Two wire RTDs can be specified by changing the “4” with a “2” in the part number.

The standard metal sheath for RTD elements are 1/4” diameter made of 316 stainless steel. Inconel 600 sheaths can be specified by changing the “16”  in the part number to a “09”.

Example part number: 4E164-11-24-12 four wire, European curve, 316 Stainless Steel 1/4 inch diameter sheath, 100 Ω ,  24” probe and leads overall, 12” probe.

Note: Richards standard RTDs have a maximum service temperature rating of 400°C (752°F).   Our high temperature RTDs have a maximum service temperature rating of  650°C (1202°F).   If you would like to specify this option, add a “H” after the curve designation letter (A or E) in the catalog number.

Need to order a Dual element or Assembly? - Insert “D” after the “E” in the catalog number.

Example:  4ED164-1-24-12