Emerson L2 Manual de Instruções descarregar pdf (Página 11)

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)

1 2 ... 6 7 8 9 10 11 12 13 14 15 16

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Emerson L2 Manual de Instruções Página 11