Installation, Operation, & Maintenance Instructions
IOM JS500.03
2016.04
Vertical Float Switches
Principle of Operation
Switching is achieved with the Jerguson
®
Tri-Magnet
system, giving snap-action, “latch-on” switching.
Vertical movement of the primary magnet A in a glandless
pressure tube simultaneously actuates magnets B & C to
switch the contacts. The Tri-Magnet system enables the
primary magnet to pass on and actuate switch
mechanisms at other levels. Switch mechanisms already
actuated can not re-set until the return of the primary
magnet actuates the magnet system once again.
The primary magnet A is moved vertically in the pressure
tube by a float mechanism which rises and falls with the
liquid level.
Series JB_ _F
Diagrammatic detail of Tri-Magnet system
Series JX_ _F
Series JD_ _F
Switch Assembly
Identification
This manual covers the three
series of switches: JB, JX and
JD as shown opposite. Also
covered in this manual are
replacement enclosures &
pressure tubes, replacement
switches, replacement floats,
as well as conversion kits
(neither pictured). Your switch
has a model number stamped
on the nameplate, examples
of which are shown on pages
4 & 5. From these numbers
you can identify your switch
and turn to the relevant pages
in this manual. As switch
mechanisms are common to
all three series, electrical
characteristics are given on
page 6.
www.Jerguson.com
●
JergusonApp@clark
‐
reliance.com
●
+1.440.572.1500
3
Secondary
switch
mechanism
magnet
Tertiary
switch
mechanism
magnet
Contact
pair
on
contact
blades
‘Primary’
magnet
encased
in
316
stainless
steel
316
stainless
steel
Float
mechanism
Glandless
316
stainless
steel
Pressure
tube
