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Leverless Limit Switches Reliability & Durability in the most demanding plant conditions.

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Presentation on theme: "Leverless Limit Switches Reliability & Durability in the most demanding plant conditions."— Presentation transcript:

1 Leverless Limit Switches Reliability & Durability in the most demanding plant conditions

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

3 Our experience 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

4 GO Switch product line A variety of shapes, sizes, and sensing ranges to fit most applications Square 10 Series Long Range 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 20 Series Side Sensing

5 GO Switch product line A variety of shapes, sizes, and sensing ranges to fit most applications Specialty Cylinder Position Sensors 7A Pneumatic Hi-Temp to F/400 0 F SubSea Submersible to 20,000 ft. N7 & P7 Nuclear Qualified Defender Turbine Valve Monitoring Systems 7D-7F Stroke-to-GO Probe lengths to standard Custom lengths to 5 3,000psi pressure rating adjustable

6 GO Switch Common Features Standard temperature: -40 o F to 221 o F Repeatability: 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 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 trace ability

8 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

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 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 400 o F 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 Switch Square - 10/20 Series The original Leverless Limit Switch –Invented in 1950s 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 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 350 o F (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 A look inside… 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. 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 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 position

25 GO Switch Square - 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 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. 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.

27 A look inside… 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

28 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

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

30 GO Switch Round - 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, were 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 burst 4:1 Safety Factor Bi-color LED indicates position 360 o adjustable head

32 Stroke-To-GO - How it Works

33 A look inside… 1. Multiple wiring options: 2. Bi-Color red and green LED position indicator increases safety and awareness for plant personnel ° 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 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 PSI 10. 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.

34 GO Switch Applications 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 Switch Applications 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 Switch Applications 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

37 GO Switch Applications 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

38 GO Switch Applications 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 Switch Power 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 BeforeAfter

41 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

42 GO Switch Where to Sell Them 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

43 GO Switch Where to Sell Them Cold Hot Explosive Wet Corrosive Abusive Dirty

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45 GO Switch FastTrack Delivery Standard items most likely to be in stock

46 Leverless Limit Switches Reliability & Durability in the most demanding plant conditions


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