2. GO Switch Leverless Limit Switches

3. GO Switch Why GO Switch is special Competition overview
GO Switch products Square Round Power
Where to sell them
Trouble shooting

4. What is so special about a GO Switch?
The broadest range of products for valves
Virtually indestructible
Extremes others can’t handle:
Temperature: -40oF to 400oF
Underwater: depths to 21,000 feet
Pressure: up to 10,000 psi
Hostiles: explosive, caustics, corrosives

5. What is so special about a GO Switch?
Total confidence in performance
No one else in the world makes a product like a GO Switch
Copied by some (in enclosure style only)
Only competition is other technologies: Mechanical, Solid State, or Reed

6. Competition: Technologies
Mechanical: Lever arm linked to the switch mechanism
Solid State: Electrically created magnetic field measures change in magnetic field to trip switch
Reed: Glass encapsulated switch mechanism tripped by a magnetic target
GO is a hybrid technology that combines the advantages of each of the above with none of their drawbacks

7. Competition: Mechanical Limit Switches
Lever arms bend, break and wear
GO is proximity - no contact,wear,torque
Multiple moving parts to fail: Lever arms, rollers, springs, gears
GO has only one moving part - no metal to metal contact making it move
Gasketed hole invites moisture and dust
GO is completely potted and sealed

8. Competition: Mechanical Limit Switches
Moisture problems are common: Contact chamber not potted Gasket dries, cracks, and fails
GO is completely potted and sealed
Repeatability is poor - lever stroke varies
GO is repeatable to 0.002” for life
Maintenance headache
GO is maintenance free

9. Competition: Inductive Proximity Sensors
Solid state - consumes power to operate
GO is dry contact - consumes no power
Two piece construction is fragile
GO is one piece stainless or brass
Must stock 4 models for AC, DC, NO, NC
GO - one model does it all
Not explosion proof
GO is Class I Div I all groups

10. Competition: Inductive Proximity Sensors
IS barrier brand sensitive
GO is simple device - use any barrier GO hermetic seal is Non-Incendive
Temperature sensitive - sensing varies
GO to 400oF with stable sensing
Many wiring precautions
GO handles high loads - no voltage drop or current leakage - series or parallel

11. Competition: Reed Switches
Switch mechanism often unreliable
GO is proven to 100s of millions of cycles
Susceptible to vibration and bounce
GO contact pressure is much greater
Glass tube hermetic seal is fragile
GO herm seal is virtually unbreakable
Require magnet to operate
GO needs only ferrous metal

12. GO Switch Product Line
Leverless Limit Switches Square - 10, 20, 35, 80 Series Round - 70 Series Stroke-to-GO
Power Products Defender - turbine trip valve monitor NuProx - nuclear qualified switches

13. GO Switch Common Features
Standard temperature: -40oF to 221oF
Repeatability: 0.002”
Response time: 8 ms
Dry contact: Consume no power to operate No voltage drop or leakage current Can wire AC or DC, NO or NC
Simple device - Intrinsically Safe

14. GO Switch Common Features
Permanent magnets: -1% every 100 years
Options galore: Stainless Steel, Epoxy, Exotic SPDT, DPDT, Quick Disconnect Explosion Proof, Hi Temp, SubSea
Target Magnets increase sensing range
Date coded for traceability

15. GO Switch Common Features
Heavy duty dry contacts Excellent for both high and low loads Vibration resistant, high contact pressure Self-cleaning with wiping action
Contact ratings are for resistive loads Inductive loads app 1/2 published ratings

16. GO Switch Square - 10/20 Series
The original Leverless Limit Switch Invented in 1958 by CR Marcum Workhorse of the industry
Same operating principle today Simple but very clever Materials upgraded through the years

17. 10/20 Series How it Works Activated Unactivated Armature Sensing Area
Target
Activated
Unactivated

18. GO Switch Square - 10/20 Series
Two magnet design Magnetic bias with see-saw armature
3/8” Side, 9/16” Extend (10), 3 3/16” Max
SPDT, DMDB, Latching 10A/120Vac, 3A/24Vdc Silver cadmium oxide, gold flashed
Hi Temp to 350oF
UL, CSA, FM, SAA, MSHA
5 conduit positions

19. 80 Series How it Works Unactivated Activated Armature Sensing Area
Target
Activated

20. GO Switch Square - 80 Series
One magnet design Magnetic bias with see-saw armature
1/4” End Sensing, 3 1/2” Max
SPDT, DPDT 10 amp/120Vac, 3 amp/24Vdc Silver cadmium oxide, gold flashed
UL, CSA, FM, SAA
2 conduit positions A2

21. GO Switch Square - 35 Series
One magnet design Magnetic bias with see-saw armature
Switchpak top sensor choice
SPDT 4 amp/120Vac, 3 amp/24Vdc Industry best
Hermetic seal A1

22. 70 Series How it Works Unactivated Activated Bias Magnet Center Magnet
Sensing
Area
Primary
Magnet
Activated
Target

23. GO Switch Round - 70 Series
The global choice on linear control valves
20 years of industry success
Several look like it, none perform like it
Unmatched durability and reliability
A2 General Purpose A2 Class I Div II A2 Class I Div I

24. GO Switch Round - 70 Series
Three magnet design Magnetic bias creates magnetic spring
.100” End Sensing, .440” Max
SPDT, DPDT 4A/120VAC, 3A/24VDC - ind. best Silver palladium, sawtooth configuration
Hi Temp to 400oF
UL, CSA, FM, CENELEC, SAA
3/8”, 5/8”, 3/4” standard sizes

25. GO Switch Round - 70 Series
Single piece construction Stainless steel barstock Prevents moisture intrusion
Can be surrounded by ferrous metal and performance is unaffected
More expensive than solid state - if they are working well, walk away - if not working, we’re in

26. Stroke-to-GO How it Works
Bias
Magnet
Cylinder Rod
Cushion
Activated
Center Magnet
Primary
Magnet
Unactivated

27. GO Switch Stroke-to-GO
Cylinder Position Sensor
Solid Stainless Steel Competition has plastic sensing face
3,000 psi working and 12,000 psi burst 4:1 UL safety ratio for cylinder apps.
Bi-color LED indicates position
360o adjustable head

28. GO Switch Power Products - Defender
Turbine Trip Valve Position Monitor
Westinghouse turbines 100+ mW Drop-in replacement
One Defender per valve 8-18 trip valves per turbine Throttle Governor Reheat Reheat Stop

29. Before
After

30. GO Switch Power Products - NuProx
Nuclear Qualified Proximity Switch
CANDU Qualified for containment
1/3 the size of Namco
Eliminates torque to operate
SPDT 1 48Vdc

31. GO Switch Power Generation Refining Oil & Gas Chemical Pulp & Paper
Food & Beverage
Pharmaceutical
Water & Wastewater
Off Shore
Automotive
Tire & Rubber
Mining
Railroad
Cement
Steel & Aluminum
Glass
Transportation

32. GO Switch Explosive Areas
Mechanical: often increases size of switch Solid State: not available Reed: some are available
GO Switch leads with global approvals UL, CSA, FM, CENELEC, SAA,MSHA Class I Div I all groups Zone 0, Zone 1, Zone 2

33. GO Switch Hostile Conditions
Caustic chemicals Corrosive liquids - salt water Coal, coke, cement, or other dust High pressure washdown, steam leaks
GO Switch is the choice Stainless steel housings Epoxy/Exotic coatings

34. GO Switch Temperature Extremes
Mechanical: -20oF to 250oF Solid State: 0oF to 158oF Reed Switch: -40oF to 220oF
GO Switch: -40oF to 400oF Cold: NASA -200oF, Syncrude -122oF Heat: only GO can go above 250oF

35. GO Switch Underwater Applications
Mechanical: not a chance Solid State: not realistically Reed Switch: rely on a reed underwater?
GO Switch is often the only real solution Depths to 21,277 feet sea water Valves, locks, sleuth gates, military SubSea connector on 10/20, 70, 80

36. GO Switch Unusual Applications
Short stroke globe valves Valve stem b/t QT valve and actuator Safety showers Security areas Wherever reliability is critical
GO Switch has so many models that there is always a solution

37. GO Switch Trouble Shooting
Sensing
Target Size - is target at least as big as the Sensing Area of the switch?
Target Mass - is target at least 1/4” thick
Target Location - is target well within Sensing Range (1/2 the range)?
Target Material - is target ferrous metal or magnet (proper polarity)?
Reset - hysteresis - does target move well outside sensing range?

38. GO Switch Trouble Shooting
Mounting
Is the mounting bracket non-ferrous? If not, were instructions followed?
Is a conduit drip loop installed to prevent moisture?
Is the conduit supported adequately?