2. 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
3. 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
4. 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
6. 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
12. Turbine Protection
Application: General Electric 1798 KW AC Vertical
Generator
Problem: Shaft (300 rpm) for Electric Grid Transfer
Customer: Duke Energy – Gaston Shoals, SC
13. Coal Feed – Ratio Metric Conveyor
Precise coal feed control to furnace
Protect against feeder clogging
Protect against machine failure
Maintain operational efficiency
14. Coal & Ash Conveyor Monitoring
Belt breakage or slippage detection
Conveyor slow-down or stoppage
Under/over speed detection
15. 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
16. Screw Conveyor
Application: Screw Conveyor – Harsh environment
Problem: Detect slow-down or zero speed of conveyor
Customer: Industrial Grain Processor
17. Rotary Airlock
Application: Rotary air lock – Harsh environment
Problem: Detect slow-down or zero speed
Customer: Industrial application
19. Bucket Elevator
Application: Grain - Bucket Elevator
Problem: Conveyor slow-down. Prevent possible
spark/explosion or product waste
Customer: Grain/Feed/Ethanol facility
20. 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
21. Oven Fan & Conveyor
Application: Mesh Belt Furnace
Problem: Conveyor & fan speed detection
Customer: Surface Combustion – Oven OEM
22. Heat Treating
Application: Monitor motor shaft speed
Problem: Maintain Consistent conveyor speed and air
flow
Customer: Thermal systems – Heat treating/drying
23. Conveyor Speed
Application: Municipal Treatment Conveyor Speed
monitoring
Problem: Speed change can cause material backup and
systems damage
Customer: City waster water treatment facility
24. Mixer
Application: Material Processing Mixer - Agitator Speed
Control
Problem: Varying material volume requires varying
agitation speed Sensor
Customer: Mixer/centrifuge
OEM & user
25. 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.
26. 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.
28. Rock Quarry
Application: Rock quarry and/or
cement plant
Problem: Conveyor slow-down.
Possible spark & Explosion, and or
loss of production
29. 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
