1. PLS2 Paddle Level Switch
The materials included in this compilation are for the use of Dwyer Instruments, Inc. potential
customers and current employees as a resource only. They may not be reproduced, published, or
transmitted electronically for commercial purposes. Furthermore, the Company’s name, likeness,
product names, and logos, included within these compilations may not be used without specific,
written prior permission from Dwyer Instruments, Inc.
©Copyright 2011 Dwyer Instruments, Inc.

2. Theory of Operation
• The paddle is installed through the wall of a
vessel so that it comes in contact with the
bulk media
• An electric motor in the control spins the
paddle. As the media builds up the paddle is
impeded from spinning
• When the paddle stops spinning the motor
then rotates activating the output switch

3. Theory of Operation
• The motor then turns off
• When the material no longer impedes the
paddle a spring mechanism reactivates the
motor, and returns the switches to the normal
position
• The paddle then starts spinning again

4. Specifications
• Temperature Limits:
Process: -25 °C to 80°C
Ambient: -4°C to 60°C
• Pressure Limit: 0.7 BAR
• Power Options: 120vac, 230vac or 24vdc
• Electrical Rating: 5amp @ 250vac
3amp @ 24vdc
• Adjustable Paddle Sensitivity
• 1-1/4” NPT Process Connection
• PLS2 comes with a paddle
• CE and FM approved

5. Paddle Sensitivity Adjustment

6. Mounting

7. Accessories
Paddles
• PLS2-PL1 - Double Sided Spring Paddle
• PLS2-PL2 - Single Sided Spring Paddle
Extensions
• PLS2-EX1 - 8.5˝ Shaft Extension
• PLS2-EX2 - 19.6˝ Shaft Extension
• PLS2-EX3 - 39.4˝ Shaft Extension
• PLS2-EX4 - 78.7˝ Shaft Extension
Mounting Flanges
• FLG-CSH – Half Coupling Mounting Flange
• FLG-CSF – Full Coupling Mounting Flange

8. Application Products
• Rocks • Silica Sand • Animal Feed
• Calcium Dust • Foundry Sand • Pellets
• Regrind • Wood Chips • Rubber
• Malt • Metal Chips • Coal
• Limestone • Peanuts • Clays
• Grain
• Pre-Mix • Resin
Ingredients • Rawhide
• Sawdust
• Fertilizer
• Granulates • Soil
• Cement

9. Applications
Plastic processing

10. Applications
Textile
Machine

11. Applications
PVC Powder
Mixer

12. Applications
Cement Silo

13. Applications
Grain Hopper

14. Pneumatic Conveying
• Powder or bulk materials are transported
through the system by pressure. The
material flows from the storage silo to the
receiving bins. The PLS indicates level at
each station.

15. Conveying
• Here the PLS is
controlling the inlet
or outlet conveying
system to keep the
silo filled.

16. Questions
To order a free catalog or for more information contact;
Dwyer Instruments, Inc., P.O. Box 373,
Michigan City, IN., 46361
Telephone: (800) 872-9141 or (219) 879-8000
Fax: (219) 872-9057
Internet address: www.dwyer-inst.com
E-mail: info@dwyer-inst.com