GO SwitchLeverless Limit Switches

GO Switch

• Why GO Switch is special

• Competition overview

• GO Switch productsSquareRoundPower

• Where to sell them

• Trouble shooting

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

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

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

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

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

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

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

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

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

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

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

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

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

Unactivated

Activated

10/20 SeriesHow it Works

SensingArea

Armature

Target

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

80 SeriesHow it Works

Unactivated

SensingArea

Armature

Activated

Target

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

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

70 SeriesHow it Works

PrimaryMagnet

CenterMagnet

BiasMagnet

SensingArea

Unactivated

Activated

Target

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

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

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

Stroke-to-GOHow it Works

CenterMagnet

BiasMagnet

PrimaryMagnet

Cylinder Rod

CushionActivated

Unactivated

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

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

Before After

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

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

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

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

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

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

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

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?

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?