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Functional Safety Manual
M310/FSM, Rev AA
January 2012
Horizontal Float Switch
PRODUCT
DESCRIPTION
Level Switch Purpose Mobrey magnetic level switches are ideal for high and low liquid level alarm, overfill
alarm, and pump control duties.
Figure 1.
Application Example:
High and Low Level Alarm
Operation Principle The level switch is designed to open or close a circuit (“switch”) as a changing liquid
level within a vessel passes the level of the float (the Switch Point).
When the process fluid level is below the Switch Point, contacts B-B are made and
contacts A-A are open (Figure 2).
When the process fluid level is above the Switch Point, contacts A-A are made and
contacts B-B are open (Figure 3).
Figure 2.
Level Decreases –
Float Pivots Downwards
s
N
s
N
Contact B-B
Contact A-A
Pushrods
Float
Magnet
Float
Cross-section of the Level Switch