Installation example: Well welded on root sleeve
Welded root sleeves - dimensions

Welded root sleeves for welded thermowells

The root sleeve is first welded on the process pipe or container, and then bored to precise inner dimensions. After that the D1S/D4/D4S/D5 type thermowell is welded on the root sleeve.

The root sleeve material needs to be the same as the welded thermowell.

Welded root sleeves, as components:

Product number Type For well type
1025309 18-K D1S and D4S
1025312 18-L D1S and D4S
1025313 18-M D1S and D4S
918138 18-O D1S and D4S
912333 24-K D1, D4 and D5
912331 24-L D1, D4 and D5
912332 24-M D1, D4 and D5
912334 24-O D1, D4 and D5

Other materials and sizes are quoted upon request.

Complete RTD and TC sensors with welded wells (D1...D5) are presented on Datasheet 4.


Krister Karlsson will leave as MD of Lapp Automatio, after 10 years in the company. Jyri Kontio, MD Lapp Connecto, will succeed him in his responsibilities as Vice President Cluster Nordic, MD LAPP...

Read more

LAPP Group is known for its sustainability. The Finnish LAPP companies wanted to contribute to society by growing their own, LAPP ikimetsä - primeval forest, in the municipality of Ylitornio, Finnish...

Read more

Lapp Automation is the leading temperature measurement specialist in Finland. In many industrial sectors and at various process stages, it is important to know the exact temperatures. Lapp Automation...

Read more
News archive


Contact form