Leverless LimitSwitches

Reliability & Durabilityin the most demandingplant conditions

GO Switch Training Agenda

• Why GO Switch is special

• Competition overview

• GO Switch products– Square– Round– Power

• Where to sell them

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

GO Switch product lineA variety of shapes, sizes, and sensing ranges to fit most applications

• Square

10 SeriesLong Range

30 SeriesEnd Sensing

35 SeriesValve Position

Sensor

80 SeriesDPDT

Round

71 & 72 3/8” dia.

73 & 745/8” dia.

75, 76 & 77Long Threads

7G & 7IDPDT

7L & LPSBriteLite LEDs

20 SeriesSide Sensing

GO Switch product lineA variety of shapes, sizes, and sensing ranges to fit most applications

Specialty

Cylinder Position Sensors

7APneumatic

Hi-Temp to3500F/4000F

SubSeaSubmersible to 20,000 ft.

N7 & P7Nuclear Qualified

DefenderTurbine Valve

Monitoring Systems

7D-7F Stroke-to-GOProbe lengths to 2.062” standardCustom lengths to 5”3,000psi pressure rating3600 adjustable

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

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

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

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: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

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

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: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

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 400oF with stable sensing

• Many wiring precautions– GO handles high loads - no voltage drop or

current leakage - series or parallel

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

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 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

10/20 Series - How it Works

OperatedWhen 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.

UnoperatedOn 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.

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…

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

80 Series - How it Works

UnoperatedThe 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.

OperatedWhen 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.

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.

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

GO SwitchSquare - 35 Series

• One magnet design– Magnetic bias with see-saw armature

• SPDT– 4 amp/120Vac, 3 amp/24Vdc

• Hermetic seal

70 Series - How it Works

UnoperatedThe 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.

OperatedWhen 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.

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

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, 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

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

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

Stroke-To-GO - How it Works

A look inside…

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.

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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 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.

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)

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

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

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

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

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

Before After

GO SwitchWhere 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

GO SwitchWhere to Sell Them

Cold

Hot

Explosive

Wet

Corrosive Abusive

Dirty

www.goswitch.com

GO Switch FastTrack DeliveryStandard items most likely to be in stock

Leverless LimitSwitches

Reliability & Durabilityin the most demandingplant conditions