Speed Switches

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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: info@dwyer-inst.com