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GO SwitchLeverless Limit Switches
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GO Switch
• Why GO Switch is special
• Competition overview
• GO Switch productsSquareRoundPower
• Where to sell them
• Trouble shooting
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What is so special about aGO 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
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What is so special about aGO 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
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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
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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
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Competition:Mechanical Limit Switches
• Moisture problems are common:Contact chamber not pottedGasket 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
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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
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Competition:Inductive Proximity Sensors• IS barrier brand sensitive
GO is simple device - use any barrierGO 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
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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
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GO SwitchProduct 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
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GO SwitchCommon Features• Standard temperature: -40oF to 221oF
• Repeatability: 0.002”
• Response time: 8 ms
• Dry contact:Consume no power to operateNo voltage drop or leakage currentCan wire AC or DC, NO or NC
• Simple device - Intrinsically Safe
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GO SwitchCommon Features• Permanent magnets: -1% every 100 years
• Options galore:Stainless Steel, Epoxy, ExoticSPDT, DPDT, Quick DisconnectExplosion Proof, Hi Temp, SubSea
• Target Magnets increase sensing range
• Date coded for traceability
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GO SwitchCommon Features
• Heavy duty dry contactsExcellent for both high and low loadsVibration resistant, high contact pressureSelf-cleaning with wiping action
• Contact ratings are for resistive loadsInductive loads app 1/2 published ratings
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GO SwitchSquare - 10/20 Series
• The original Leverless Limit SwitchInvented in 1958 by CR MarcumWorkhorse of the industry
• Same operating principle todaySimple but very cleverMaterials upgraded through the years
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Unactivated
Activated
10/20 SeriesHow it Works
SensingArea
Armature
Target
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GO SwitchSquare - 10/20 Series• 11-12110-00• 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
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80 SeriesHow it Works
Unactivated
SensingArea
Armature
Activated
Target
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GO SwitchSquare - 80 Series• One magnet design
Magnetic bias with see-saw armature
• 1/4” End Sensing, 3 1/2” Max
• SPDT, DPDT10 amp/120Vac, 3 amp/24Vdc Silver cadmium oxide, gold flashed
• UL, CSA, FM, SAA
• 2 conduit positions
• 81-20516-A2
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GO SwitchSquare - 35 Series
• One magnet designMagnetic bias with see-saw armature
• Switchpak top sensor choice
• SPDT4 amp/120Vac, 3 amp/24VdcIndustry best
• Hermetic seal
• 35-113311-A1
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70 SeriesHow it Works
PrimaryMagnet
CenterMagnet
BiasMagnet
SensingArea
Unactivated
Activated
Target
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GO SwitchRound - 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
• 73-13528-A2 General Purpose73-13526-A2 Class I Div II73-13523-A2 Class I Div I
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GO SwitchRound - 70 Series• Three magnet design
Magnetic bias creates magnetic spring• .100” End Sensing, .440” Max• SPDT, DPDT
4A/120VAC, 3A/24VDC - ind. bestSilver palladium, sawtooth configuration
• Hi Temp to 400oF• UL, CSA, FM, CENELEC, SAA• 3/8”, 5/8”, 3/4” standard sizes
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GO SwitchRound - 70 Series
• Single piece constructionStainless steel barstockPrevents 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
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Stroke-to-GOHow it Works
CenterMagnet
BiasMagnet
PrimaryMagnet
Cylinder Rod
CushionActivated
Unactivated
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GO SwitchStroke-to-GO
• Cylinder Position Sensor
• Solid Stainless SteelCompetition has plastic sensing face
• 3,000 psi working and 12,000 psi burst4:1 UL safety ratio for cylinder apps.
• Bi-color LED indicates position
• 360o adjustable head
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GO SwitchPower Products - Defender
• Turbine Trip Valve Position Monitor• Westinghouse turbines 100+ mW
Drop-in replacement• One Defender per valve
8-18 trip valves per turbineThrottleGovernorReheatReheat Stop
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Before After
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GO SwitchPower Products - NuProx
• Nuclear Qualified Proximity Switch
• CANDU Qualified for containment
• 1/3 the size of Namco
• Eliminates torque to operate
• SPDT1 amp @ 48Vdc
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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
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GO Switch
Explosive Areas
Mechanical: often increases size of switchSolid State: not availableReed: 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
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GO Switch
Hostile Conditions
Caustic chemicalsCorrosive liquids - salt waterCoal, coke, cement, or other dustHigh pressure washdown, steam leaks
GO Switch is the choice Stainless steel housings Epoxy/Exotic coatings
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GO Switch
Temperature Extremes
Mechanical: -20oF to 250oFSolid State: 0oF to 158oFReed Switch: -40oF to 220oF
GO Switch: -40oF to 400oF Cold: NASA -200oF, Syncrude -122oF Heat: only GO can go above 250oF
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GO Switch
Underwater Applications
Mechanical: not a chanceSolid State: not realisticallyReed 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
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GO Switch
Unusual Applications
Short stroke globe valvesValve stem b/t QT valve and actuatorSafety showersSecurity areasWherever reliability is critical
GO Switch has so many models that there is always a solution
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GO SwitchTrouble ShootingSensing• 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?
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GO SwitchTrouble 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?