J52 Refrigerant
Level Switches
Instruction Manual and Parts List
OPERATING PRINCIPLE
Figures 1 and 2 illustrate the simple and foolproof
Magnetrol operating principle. Switching action is obtained
through the use of a magnetic attracting sleeve, actuated
by a float, and a switching mechanism. These two basic
component assemblies are separated by a non-magnetic,
pressure tight enclosing tube. The switch and magnet are
assembled to a swinging arm which operates on precision
stainless steel pivot sockets.
Dry Contact Switch
Enclosing Tube
(non-magnetic)
Attracting Sleeve
(magnetic)
Pivot
Return
Spring
Magnet
Float
Normal Operating Level
Figure 1
Falling Level
DESCRIPTION
The Magnetrol
®
Model J52 is designed specifically as a
refrigerant level control for applications with commercial
refrigerants including Ammonia, Freon, Methyl Chloride,
and Sulphur Dioxide. Usage may include level alarm and/or
pump control service on liquid accumulators or receivers.
MODEL IDENTIFICATION
Housing
NEMA 4X
NEMA 4X/7/9
Switch
Dry Contact
Dry Contact
Connection
3
Figure 2
OPERATING CYCLE
At “Normal Operating Level” of liquid in the chamber
(Figure 1), the float moves the magnetic attracting sleeve up
the enclosing tube and into the field of the switch mecha-
nism magnet. As a result, the magnet is drawn in tightly to
the enclosing tube causing the switch to actuate, “making”
or “breaking” an electrical circuit. As liquid level recedes,
the float pulls the magnetic attracting sleeve downward
until, at a pre-determined “Low Level” (Figure 2), the switch
magnet releases and is drawn outward away from the
enclosing body of the tube by a tension spring. This in turn
deactuates the switch. When liquid level returns to normal
(Figure 1), the float once again moves the magnetic attracting
sleeve up at the enclosing tube, causing the switch to
assume its original position.
⁄
4
" NPT
3
⁄
4
" Socket Weld
J52-4111-002
—
J52-4112-002
J52-4101-002
J52-4107-004
J52-4102-002
NEMA 4 Lexan Dry Contact
MAGNETROL [ MAGNETROL INTERNATIONAL, INC. ]
