Submittal Sheet

Effective: January 2014
4 F-01-020 Rev AA
PROTECTIVE WELLS
For use with 170XX 5/8” Diameter Cartridge THERMOSWITCH
®
Controllers
Catalog No. 34-011201-000
Hex Head Well
(321 Stainless Steel Well & Head)
Applicable Modifications
1 Special Marking
Applicable Special Features
31A Extended Shell
Approximate weight is 4 ounces (112 grams)
Pressure Ratings: 100 psi at -100
º
F to +250
º
F
60 psi at 600
º
F
Catalog No. 34-011204-000
Coupling Head Well
(321 Stainless Steel Well & Head)
Applicable Modifications
1 Special Marking
Applicable Special Features
31A Extended Shell
Approximate weight is 5 ounces (140 grams)
Pressure Ratings: 100 psi at -100
º
F to +250
º
F
60 psi at 600
º
F
Catalog No. 34-011100-002
Aluminum Surface Mount Well
Approximate weight is 4 ounces (112 grams)
Pressure Ratings: 100 psi at -100
º
F to +250
º
F
60 psi at 600
º
F
For use with 172XX and 173XX THERMOSWITCH
®
Controllers
Catalog No. 34-011208-000
Low Pressure Hex Head Well
(321 Stainless Steel Well & Head)
Applicable Modifications
Special Marking
Applicable Special Features
31A Extended Shell
Approximate weight is 4 ounces (112 grams)
Pressure Ratings: 100 psi at -100
º
F to 250
º
F
60 psi at 600
º
F
In many applications involving liquid and gases, the use of a well is
recommended. When the removal of a hex or coupling head THERMOSWITCH
®
controller would require draining of the container in which it is inserted, the use of
a well assembly permits removal of the controller at any time without other
disturbances. When surrounding ambients are subject to extreme changes thus
affecting THERMOSWITCH
®
control, the well makes it possible to insert the
THERMOSWITCH
®
controller completely into the medium being controlled
thereby eliminating these ambient temperature effects or “head effect”.
A well offers protection in applications where fluids have a corrosive effect on the
brass shell of the THERMOSWITCH
®
controller.
Note: Certain gases or liquids (including water at elevated
temperatures) could be corrosive and/or cause electrolytic
action, which could severely shorten the life of the
controller. Where corrosion or electrolysis is suspect, the
use of stainless steel heliarc welded thermowells or
various platings or coatings may increase controller life.
The rate of corrosion or electrolysis is influenced by a
great many system parameters such as chemical makeup
and temperature of the solution, stray electric currents, etc.
Consult the supplier of your chemicals or Fenwal for
suggestions.
In addition, use a well to protect the THERMOSWITCH
®
controller from external forces or blows which could affect
its operation.