GO Switch Leverless Limit Switches GO Switch Why

GO Switch Leverless Limit Switches

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

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

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

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 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

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 barrier GO hermetic seal is Non-Incendive • Temperature sensitive - sensing varies GO to 400 o. F 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 100 s 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 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 Nu. Prox - nuclear qualified switches

GO Switch Common Features Standard temperature: -40 o. F to 221 o. F 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 • •

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

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

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

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

GO Switch Square - 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 10 A/120 Vac, 3 A/24 Vdc Silver cadmium oxide, gold flashed • Hi Temp to 350 o. F • UL, CSA, FM, SAA, MSHA • 5 conduit positions

Armature Sensing Area Unactivated Target Activated 80 Series How it Works

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/120 Vac, 3 amp/24 Vdc Silver cadmium oxide, gold flashed • UL, CSA, FM, SAA • 2 conduit positions • 81 -20516 -A 2

GO Switch Square - 35 Series • One magnet design Magnetic bias with see-saw armature • Switchpak top sensor choice • SPDT 4 amp/120 Vac, 3 amp/24 Vdc Industry best • Hermetic seal • 35 -113311 -A 1

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

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 73 -13528 -A 2 General Purpose 73 -13526 -A 2 Class I Div II 73 -13523 -A 2 Class I Div I

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

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

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

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 • 360 o adjustable head

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

Before After

GO Switch Power Products - Nu. Prox • • • Nuclear Qualified Proximity Switch CANDU Qualified for containment 1/3 the size of Namco Eliminates torque to operate SPDT 1 amp @ 48 Vdc

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 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

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

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

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 Sub. Sea connector on 10/20, 70, 80

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

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?

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?