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Leverless Limit Switches

Leverless Limit Switches. Reliability & Durability in the most demanding plant conditions. GO Switch Training Agenda. Why GO Switch is special Competition overview GO Switch products Square Round Power Where to sell them. Factory Automation Automotive Cement Diecasting Steel

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Leverless Limit Switches

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  1. Leverless Limit Switches Reliability & Durabilityin the most demandingplant conditions

  2. GO Switch Training Agenda • Why GO Switch is special • Competition overview • GO Switch products • Square • Round • Power • Where to sell them

  3. Factory Automation Automotive Cement Diecasting Steel Tire & Rubber Tool & Die Process Automation Biotech Chemical Food & Beverage Hydrocarbon Mining Oil & Gas Petrochemical Power Pulp & Paper Water/Wastewater Our experience

  4. GO Switch product lineA variety of shapes, sizes, and sensing ranges to fit most applications • Square 10 Series Long Range 20 Series Side Sensing 30 Series End Sensing 35 Series Valve Position Sensor 80 Series DPDT Round 71 & 72 3/8” dia. 73 & 74 5/8” dia. 75, 76 & 77 Long Threads 7G & 7I DPDT 7L & LPS BriteLite LEDs

  5. GO Switch product lineA variety of shapes, sizes, and sensing ranges to fit most applications Specialty 7A Pneumatic SubSea Submersible to 20,000 ft. N7 & P7 Nuclear Qualified Defender Turbine Valve Monitoring Systems Hi-Temp to3500F/4000F CylinderPosition Sensors 7D-7F Stroke-to-GO Probe lengths to 2.062” standard Custom lengths to 5” 3,000psi pressure rating 3600 adjustable

  6. GO SwitchCommon 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 • Highest volt/current rating on the market for prox switch • Simple device - Intrinsically Safe

  7. GO SwitchCommon 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 trace ability

  8. GO SwitchCommon 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

  9. 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

  10. Competition:Limit Switch • A Limit Switch is an electrical mechanical device that that provides an electrical signal through a set of contacts. • When the object to be sensed comes in contact with an actuator, this mechanical motion closes (makes) or opens (breaks) a set of contacts • Limit Switches are often applied because • They do not require external power • Have a very wide voltage and current range • Do not have leakage current • Have a higher temperature range than solid state sensors • Disadvantages • Require contact with object to be sensed • Limited sensing distance • Mechanical wear

  11. Competition:Mechanical Limit Switches • Lever arms bend, break and wear • Some require up to 32 in lbs to operate • 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 • Hole(s) with gaskets invite moisture and dust • GO is completely potted and sealed

  12. 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

  13. Competition:Proximity Switches • Traditional “prox” switches are solid state devices. They use inductive sensing technology to detect the presence of absence of a metallic target • Many shapes and sizes • Square, rectangular, cylindrical, puck, etc • Can be very small • Works better in tough environments as compared to Photoelectrics and Limit Switches • Low cost

  14. 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

  15. 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

  16. Competition:Reed Switches • A Reed Switch consists of two magnetic contacts when approached by a target magnet, attract each other and close a circuit. • Contacts are contained in a gas filled glass tube • Can be packaged in many different sized enclosures • Designed to switch lower currents and can not handle high current loads

  17. 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

  18. GO SwitchSquare - 10/20 Series • The original Leverless Limit Switch • Invented in 1950’s by CR Marcum • Workhorse of the industry • Same operating principle today • Simple but very clever • Materials upgraded through the years

  19. 10/20 Series - How it Works Operated When a ferrous target enters the sensing area of the switch, it diverts flux lines from the armature to create a magnetic dominance on the opposite side. As a result, the armature snaps to its operated position, closing the other contact circuit. When the target is removed the armature snaps back to its original, unoperated position. Unoperated On the sensing side of the switch, one magnet is positioned closer to the armature, creating a dominant magnetic flux field which draws the armature down to its unoperated position, closing a contact circuit.

  20. 1.Seesaw armature provides snap action and solid contact pressure, eliminating ‘contact teasing’ and ‘contact chatter’ in high vibration applications.2.Versatile gold flashed contacts are suitable for high and low electrical loads, and can be wired AC or DC, N/O or N/C.3.Sealed contact chamber prevents moisture or dust from reaching the contacts.4.Side sensing range can be extended to nearly 4” using external target magnets.5.Permanent magnets never lose their strength, even when mounted on ferrous metal. 6.Rugged brass or stainless steel housing withstands physical abuse, moisture, and corrosives. 7.Multiple wiring options:-Terminal Block -Lead Wires -Cable-Quick Disconnects 8.Potting fills the entire switch cavity, forming a barrier against moisture.9.Conduit hub can be located in any of 5 positions for versatile installation.10.Consumes no power to operate and has no current leakage or voltage drop. A look inside…

  21. GO SwitchSquare - 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 (10) • UL, CSA, FM, SAA, MSHA • 5 conduit positions

  22. 80 Series - How it Works Unoperated The armature is positioned off-center of the magnet, creating a dominant magnetic flux field on the sensing end of the switch which draws the armature down to its unoperated position, closing a contact circuit. Operated When a ferrous target enters the sensing area of the switch, it diverts flux lines from the armature to create a magnetic dominance on the opposite side. As a result, the armature snaps to its operated position, closing the other contact circuit. When the target is removed the armature snaps back to its original, unoperated position.

  23. 1.Seesaw armature provides snap action and solid contact pressure, eliminating ‘contact teasing’ and ‘contact chatter’ in high vibration applications.2.End sensing range can be extended to nearly 4" using external target magnets.3.Permanent magnets never lose their strength, even when mounted on ferrous metal.4.Sealed contact chamber prevents moisture or dust from reaching the contacts.5.Potting fills the entire switch cavity, forming a barrier against moisture.6.Versatile gold flashed contacts are suitable for high and low electrical loads, and can be wired AC or DC, N/O or N/C. A look inside… • 7.Brass, stainless steel or copper housing withstands physical abuse, moisture, and corrosives.8.Conduit outlet on bottom of housing for versatile installation.9.Multiple wiring options: • Terminal Block • Lead Wires • Cable • Quick Disconnect • 10.Consumes no power to operate and has no current leakage or voltage drop.

  24. GO SwitchSquare - 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 position

  25. GO SwitchSquare - 35 Series • One magnet design • Magnetic bias with see-saw armature • SPDT • 4 amp/120Vac, 3 amp/24Vdc • Hermetic seal

  26. 70 Series - How it Works Operated When a ferrous target enters the sensing area of the switch, it attracts the primary magnet, which pulls the connecting rod forward. As a result, the common contact snaps to its operated position, closing the other contact circuit. When the target is removed the common contact snaps back to its original, unoperated position. Unoperated The center magnet simultaneously attracts the primary magnet and repels the bias magnet, pushing the connecting rod backward. As a result, the common contact rests in its unoperated position, closing a contact circuit.

  27. 1.Permanent magnets never lose their strength, even when threaded into ferrous metal.2.End sensing range can be extended using external target magnets.3.Sensing face is stainless steel rather than plastic, preventing damage due to incidental physical contact.4.Three magnets provide snap action and solid contact pressure, eliminating ‘contact teasing’ and ‘contact chatter’ in high vibration applications.5.English or metric threads available.6.Unique sawtooth contacts are suitable for high and low electrical loads, and can be wired AC or DC, N/O or N/C. • 7.Sealed contact chamber prevents moisture or dust from reaching the contacts.8.Potting fills the entire switch cavity, forming a barrier against moisture.9.One-piece stainless steel construction makes this the most durable proximity sensor in the world.10.Consumes no power to operate and has no current leakage or voltage drop.11.Multiple wiring options: • Lead Wires • Cable • Quick Disconnect A look inside…

  28. 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

  29. GO SwitchRound - 70 Series • Three magnet design • Magnetic bias creates magnetic spring • .100” End Sensing, 0.350” Max • SPDT, DPDT • 4A/120VAC, 3A/24VDC - Industry Best • Silver palladium contacts • Sawtooth configuration • Hi Temp to 400oF • UL, CSA, FM, CENELEC, SAA • 3/8”, 5/8”, 3/4” diameter std sizes

  30. GO SwitchRound - 70 Series • Single piece construction • Stainless steel barstock • Prevents moisture intrusion • Hermetic seals and DPDT contacts available on 7G,7H & 7I • More expensive than solid state - if they are working well, walk away - if not working, we’re in

  31. Cylinder Position Sensor Stroke-To-GO • Cylinder Position Sensor • Solid Stainless Steel • Competition has plastic or ceramic sensing face • 3,000 psi working and 12,000 psi burst4:1 Safety Factor • Bi-color LED indicates position • 360o adjustable head

  32. Stroke-To-GO - How it Works

  33. 1.Multiple wiring options:2.Bi-Color red and green LED position indicator increases safety and awareness for plant personnel.3.360° rotatable head makes installation simple and easy.4.Potting fills the entire switch cavity, forming a barrier against moisture.5.Unique sawtooth contacts are suitable for high and low electrical loads, and can be wired AC or DC, N/O or N/C.6.Three magnet design provides snap action and solid contact pressure, eliminating ‘contact teasing’ and ‘contact chatter’ in high vibration applications. 7.All stainless steel construction makes this the most durable cylinder position sensor in the world.8.Probe lengths ranging from 1" to 5" ensure a proper fit to virtually any cylinder.9.O-Ring seals in pressures up to 3,000 PSI10.Sensing face is stainless steel rather than plastic, and is therefore more suitable for high pressure hydraulic cylinder applications.11.Permanent magnets never lose their strength, even when mounted on ferrous metal. - - - A look inside…

  34. GO SwitchApplications • Explosive Areas • Mechanical: often increases size of switch • Solid State: not 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 • ATEX Certified (Selected 70 Series Models)

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

  36. GO SwitchApplications • 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

  37. GO SwitchApplications 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

  38. GO SwitchApplications 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

  39. GO SwitchPower Products - Defender • Turbine Trip Valve Position Monitor • Westinghouse turbines 100+ Mega Watts • Drop-in replacement • One Defender per valve • 8-18 trip valves per turbine • Throttle • Governor • Reheat • Reheat Stop • Intercept

  40. Before After

  41. 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 SwitchWhere to Sell Them

  42. GO SwitchWhere to Sell Them Hot Dirty Wet Cold Corrosive Abusive Explosive

  43. www.goswitch.com

  44. GO Switch FastTrack DeliveryStandard items most likely to be in stock

  45. Leverless Limit Switches Reliability & Durabilityin the most demandingplant conditions

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