Principle Of Operation - Milltronics POINTEK PLS 200 Manual De Instrucciones

PLS 200 Introduction
Notes
• Installation, maintenance, and commissioning must be performed by qualified
technical personnel.
• The PLS 200 must be used only in the manner outlined in this instruction manual.
The PLS 200 rotating paddle switch is used for level monitoring of bulk materials. It can be
used to detect full, demand, or empty conditions in silos, hoppers, or storage vessels of
materials such as grain, feed, cement, plastic granulate, and wood chips. The paddle
switch measures bulk densities as low as 100 g/l (6.25 lb/ft
vane or 35 g/l (2.19 lb/ft
PLS 200 Features
• High integrity mechanical seal
• Switch selectable power supply
• Unique friction clutch mechanism. When the measuring vane encounters sudden
resistance, the friction clutch slips to prevent internal component damage.
• NPT, BSP process connections
• Rotatable enclosure
• Optional hinged vane for use with low bulk density materials
• Compact, rigid extension and cable extension configurations available
PLS 200 Applications
• Grain, feed, cement, plastic granulate, wood chips, rice, soybeans, etc.
• Low or high bulk density materials

Principle of Operation

A low revolution gearing motor drives a rotating measuring vane. When material reaches
the rotating vane, rotation stops, actuating a microswitch contact closure. When the
vane is no longer covered, rotation resumes and the microswitch reverts to its normal
condition.
The synchronous induction motor is freely suspended within the housing. When the
rotation is slowed by the material, the reaction torque is used to operate a micro-switch
giving an electrical signal to stop the motor.
When the material level moves away from the rotating vane, a spring draws the motor
back into operating position, the microswitch returns to operating position, and the motor
is switched back on.
7ML19981FS61
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) with the optional hinged vane.
Pointek PLS 200 – INSTRUCTION MANUAL
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) with the standard measuring
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