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3
Level
Installation, operation & maintenance instructions
IP152, Rev AD
April
2012
Mobrey vertical magnetic level controls
Principle of Operation
Switching is achieved with the Mobrey
“three-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 “three-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 is moved vertically in the
pressure tube by a float or displacer
mechanism which rises and falls with the liquid
level.
Identifying your control
This manual covers the three series of controls:
B, X and D as shown opposite. Your control
has a part number stamped on the nameplate,
an example of which is shown below. From this
number you can identify your control and turn to
the relevant pages in this manual. As switch
mechanisms are common to all three series,
electrical characteristics are given on page 4.
Series & material of construction
Float or displacer module
Enclosure module
No. of switch mechanisms
Type of switch mechanisms
Chamber or flange module
Controls manufactured to customer’s
requirements outside of our standard range will
be numbered 707★★/★★★/★ and may be
i
dentified according to the pictures above.
Displacer operated controls are covered in
Installation Instruction booklet IP153.
Diagrammatic detail of three magnet system
Series B pages 5 & 6
XC 13F S7A 1 D8/112
Series X pages 5 & 6
Series D pages 7 & 8