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Speed Switches
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
NSS How it Works
Sensor disc is attached to rotating shaft that is
being monitored
Sensor disc has magnets in it that creates an
alternating magnetic field
Sensor is mounted across from disc and detects
magnetic field changes as a frequency
NSS How it Works
The switch decodes the magnetic frequency
signal to calculate a rotation speed in RPM
The switch compares the present speed to that
of the set point
Switch is activated according to set up for under
speed, over speed, or no speed
NSS
Two ranges: 10 to 100 RPM and 100 to 5000 RPM
Set point can be set anywhere in the range
SPDT switch rated 5A @ 115 VAC
Temperature Limits: -40 to 140°F (-40 to 60°C)
Comes pre-wired with 12” (30.5 cm) of 18 AWG
NSS
Power Requirement: 115 VAC
Gap Distance: 3/8”(9.5 mm) ±1/8” (3.1
mm)
Conduit Entrance: 1” female NPT
Non-Contact vs Contact
The sensor is not connected to the
rotating shaft
No worries about bearings to wear out
No mechanical linkages to wear out or
break
Easier to install then direct couple types
as alignment is not as critical
NSSM
Metal housing
Explosion-proof
UL pending
Can come in kit with
disc or with disc
separate
NSSP
Plastic housing
NEMA 4X
Disc comes
separately
Discs and Mounting Brackets
NSS Applications
Drive trains
Crushers
Belt conveyors
Bucket elevators
Exhaust fans
Screw conveyors
Tail pulleys
Looking for belt breaks, slippage, clogs, overloads, failures
Turbine Protection
Application: Westinghouse AC Vertical 2900 KW
Generator
Problem: Shaft (300 rpm) for Electric Grid Transfer
Customer: Duke Energy – Gaston Shoals, SC
Turbine Protection
Application: General Electric 1798 KW AC Vertical
Generator
Problem: Shaft (300 rpm) for Electric Grid Transfer
Customer: Duke Energy – Gaston Shoals, SC
Coal Feed – Ratio Metric Conveyor
Precise coal feed control to furnace
Protect against feeder clogging
Protect against machine failure
Maintain operational efficiency
Coal & Ash Conveyor Monitoring
Belt breakage or slippage detection
Conveyor slow-down or stoppage
Under/over speed detection
Boiler Feed-Water Pump Protection
Protect high service pump shafts from shaft reversal
Avoid costly equipment damage caused by reverse water
flow
Rugged & reliable system
Easy installation & set up
Cost effective pump protection
Screw Conveyor
Application: Screw Conveyor – Harsh environment
Problem: Detect slow-down or zero speed of conveyor
Customer: Industrial Grain Processor
Rotary Airlock
Application: Rotary air lock – Harsh environment
Problem: Detect slow-down or zero speed
Customer: Industrial application
Industrial Mixer
Application: Industrial Mixer – Harsh environment
Problem: Detect slow-down or zero speed
Bucket Elevator
Application: Grain - Bucket Elevator
Problem: Conveyor slow-down. Prevent possible
spark/explosion or product waste
Customer: Grain/Feed/Ethanol facility
Blower Monitoring Application: Industrial heat treating machinery –
Blower monitoring
Problem: If belt breaks or motor stops toxic fumes build up – possible fire hazard
Customer: Industrial heat treating oven OEM and/or end user
Oven Fan & Conveyor
Application: Mesh Belt Furnace
Problem: Conveyor & fan speed detection
Customer: Surface Combustion – Oven OEM
Heat Treating
Application: Monitor motor shaft speed
Problem: Maintain Consistent conveyor speed and air
flow
Customer: Thermal systems – Heat treating/drying
Conveyor Speed Application: Municipal Treatment Conveyor Speed
monitoring
Problem: Speed change can cause material backup and
systems damage
Customer: City waster water treatment facility
Mixer Application: Material Processing Mixer - Agitator Speed
Control
Problem: Varying material volume requires varying
agitation speed
Customer: Mixer/centrifuge
OEM & user
Sensor
Conveyor Protection – Slow Down/Zero Speed
•Applications: Grain/Feed, Cement/Aggregate, Mining,
Packing, Paper, Textile, etc.
•Senses belt slippage, slow-down and/or zero speed
•Simple, low-cost machine protection
•Provides early warning & prediction maintenance
•Increased efficiency, increased productivity, reduced
down-time, etc.
Automobile Conveyor
Application: Fixtured chain conveyors for controlling line
speed on automotive assembly lines.
Problem: Conveyor over speed (a.k.a. runaway or
break away speed) can cause chassis collision,
possibly causing severe damage and/or injury.
Garbage Shredder
Application: Conveyor speed monitor – garbage
shredder
Problem: conveyor speed fluctuations are critically
monitored
Rock Quarry
Application: Rock quarry and/or
cement plant
Problem: Conveyor slow-down.
Possible spark & Explosion, and or
loss of production
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: [email protected]