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Instruction Manual

D103531X012

L2e Controller

June 2014

Principle of Operation

The operation of the L2e is based on Archimedes Principle, which states that a body immersed in a liquid will be

buoyed up by a force equal to the weight displaced. The buoyant force and resultant movement of the displacer in the

liquid is transmitted to the controller. As the buoyant force changes a proportional change in movement is seen by

levers A and B (refer to figure 7). Levers A and B are arranged and connected by movable pivot or span adjustment so

that the resultant movement between the plunger and the switch can be adjusted. For a given change in displacer

movement the span adjustment will increase or decrease a proportional change in the plunger movement. As fluid

level rises, the plunger moves away from the switch and vice versa.

Figure 7. Fisher L2e Controller

SWITCH

SPAN

ADJUSTMENT

LEVER B

GG10047

w/Displacer Rod

PLUNGER

FACTORY SET - DO NOT ADJUST

LEVER A

CONTROLLER MOUNTING

SCREWS (KEY 24)

ZERO SPRING

(KEY 7)

ZERO ADJUSTMENT

DISPLACER

ROD (KEY 64)

ZERO ADJUSTMENT

HEX NUT (KEY 5)

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Emerson L2 Bedienerhandbuch Seite 11