281 adjustable dead band pressure switchfile.yizimg.com/4338/2005429112092811482133.pdfactuation...

1Registered Quality System to ISO 9001

Adjustable Dead BandPressure Switches

Form 281

pressure switch should be used when there is arequirement for an adjustable and wide deadband between the increasing and decreasingset points.

FunctionAlarm: Hi — LoControl: On — Off V1 Weathertight Housing

Featu

res a

nd B

en

efits • Wide adjustable dead band

• Independent adjustments for increasing and decreasing Set Points

• Field adjustable with fine resolution of Set Points

• Instrument quality — high repeatability

• High overrange and proof pressures

• Exceptionally long life

• Not critical to vibration

• Wide selection of wetted parts materials for process compatibility andcontainment

V3 Weathertight Explosion ProofHermetically Sealed Switches

Registered Quality System to ISO 9001

The adjustable dead band

2 Registered Quality System to ISO 9001

The SOR Adjustable Dead Band pressure switch incorporates two industry proven Static “O” Ring pressure sensingelements. Media pressure on the areas of the pistons counteracts the forces of the range springs — each adjustableby a separate adjusting nut — and moves the piston shafts to operate the lever assembly which, in turn, actuates anddeactuates the electrical switching element. Each pressure sensing element of the Adjustable Dead Band pressureswitch is a force balance piston-actuated assembly sealed by a flexible diaphragm and an o-ring that is static. The onlywetted parts are the single pressure port, two diaphragms, and two o-rings all indicated with asterisks (*) in thisillustration.

Principle


No Pressure: Electrical switching element isdeactuated.

Pressure greater than decreasing Set Point but lessthan increasing Set Point. Electrical switchingelement remains deactuacted.

Pressure equal to or greater thanincreasing Set Point: Electricalswitching element is actuated.

Pressure less than increasing SetPoint but greater than decreasingSet Point: Electrical switchingelement remains actuated.

Pressure equal to or less thandecreasing Set Point: Electricalswitching element is deactuated.

*Pressure Port

Principle SchematicThe lever assembly travel illustrated here has been exaggerated for clarity.

Screw Terminal Block(Weathertight Model Only)

Lever Assembly

Calibration Scale

Decreasing Set PointAdjusting Nut

Piston Assembly

Pressure Range Spring

*Diaphragm

*O-Ring

*O-Ring

*Diaphragm

Pressure Range Spring

Piston Assembly

Housing

Increasing Set PointAdjusting Nut

Calibration Scale

Electrical SwitchingElement (Explosion Proof

Model has HermeticallySealed SwitchingElement Capsule)

Actuation Deactuation


How to Order


6V1-LA3-N6-C1A-YYModel Number System

� Housing DiaphragmSwitchingElement

� Pressure Port Accessories

How to OrderInformation and data in this catalog are formatted to provide a convenient guide to assistinstrument engineers, plant engineers and end users in selecting pressure switches for theirunique applications.

Steps 1 through 5 are required. Step 6 is optional. Orders must have complete model numbers,i.e. each component must have a designator.

Step 1: Select Adjustable Range from pages 4, 5 and 6 to fill in � and �.

Step 2: Select Housing. Weathertight or explosion proof/weathertight (page 6).

Step 3: Select electrical Switching Element for electrical service (page 7).

Step 4: Select Diaphragm and O-Ring for process compatibility and containment (page 8).

Step 5: Select Pressure Port for process compatibility and connection (page 9).

Step 6: Select Accessories required for service (page 9).

If Agency Approved, Certified or Listed pressure switches are required, see page 10 forcomponents that must be specified.


Six adjustable dead band ranges are available. Each adjustable range is displayed on a grid(pages 5 and 6). Determine the correct adjustable range for the application by checkingincreasing and decreasing Set Point requirements against the tables. In the example below, acontact closure is required when pressure increases to 160 psi. The same contact must openwhen pressure decreases to 60 psi. Since 60 psi is within the blue field, the example grid range iscorrect for the application.

When the correct range grid is selected, insert range designators � and � from that grid into themodel number.

Step 1Find the specified increasing Set Point at the top of the graph.

Adjustable Dead BandPressure Switches Step 1: Adjustable Range

5V1-LA3-N6-C1A-YY

Increasing Set Point (PSI)

5V1-LA3-N6-C1A-YY

Step 2Find the specifieddecreasing SetPoint along the leftedge of the graph.

Step 3Following the verticalline down from theincreasing Set Point.Follow the horizontal lineacross from thedecreasing Set Point.Any point within the bluefield is acceptable.

240

0

20

40

80

120

160

200 80 100 120 160 200

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○

5 - 3

5 31 2

1st and 4th places in model number

Dec

reas

ing

Set

Poi

nt (

psi)



25

0

2

40

80

120

160

22 5 9 13 17

1 2

Dec

reas

ing

Set

Poi

nt (

psi)

100

0

10

20

40

60

8020 30 40 60 80

1 2

Dec

reas

ing

Set

Poi

nt (

psi)

0

20

40

80

120

160

200 80 100 120 160 200

1 2

Dec

reas

ing

Set

Poi

nt (

psi)

0

50

100

200

300

150 200 250 350

Overrange 2500 psi 170 barProof 3875 psi 267 bar

1 2

240

Increasing Set Point (psi)



4 4

5 3

21

18

14

10

6

6 3

9 4




Dec

reas

ing

Set

Poi

nt (

psi)

5V1-LA3-N6-C1A-YY

450


350


0

100

200

400

600

800300 400 600 800

1 2

Dec

reas

ing

Set

Poi

nt (

psi)

1000


9 50

100200300

600

900

600 900 1200 1500

1 2D

ecre

asin

g S

et P

oint

(ps

i)

1750


9 45

1200

1500


Step 2: Housing

6V1-LA3-N6-C1A-YY

Service Description Designator

Non-HazardousLocations

HazardousLocations

(UL Listed/CSA CertifiedSnap Switch)

Weathertight for non-hazardous service.NEMA 4, 4X & IP65Electrical conduit connection: 3/4” NPT(F)Material: 356 aluminumUse LA or SA switching element and terminalblock.Shipping weight: 4 pounds (2 kgs)See cutaway view on page 2; dimensions onpage 14.

V1

Explosion proof and weathertight. NEMA 4, 4X &IP65. Class I, Group A, B, C, D;Class II, Group E, F, G; Division 1 & 2Electrical conduit connection: 3/4” NPT(F)Material: 356 aluminumUse AG switching element; hermetically sealed SScapsuleShipping weight: 5 pounds (2.5 kgs)

V3



5V1-LA3-N6-C1A-YY


Adjustable Dead BandPressure Switches Step 3: Switching Elements

6V1-LA3-N6-C1A-YY

1. The switching elements shownabove are UL Listed and CSACertified. The DC current ratingmarked (*) is not UL Listed but hasbeen verified by testing and/orexperienced.

2. The hermetically sealed switchingelement capsule is UL Listed, CSACertified and SAA Approved as asnap switch in accordance with thefollowing table.

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Adjustable Dead BandPressure Switches Step 4: Diaphragm and O-Ring

6V1-LA3-N6-C1A-YY

Notes1. N4 diaphragm system is standard. It is

normally suitable for air, oil, water and non-corrosive processes.

2. Other diaphragm and o-ring combinationsmay be available. Consult the factory or theSOR representative in your area for moreinformation.

3. Wetted parts have been selected asrepresenting the most suitable commer-cially available material for use in theservice intended. However, they do notconstitute a guarantee against corrosion orpermeation, since processes vary formplant to plant and concentration of harmfulfluids, gases or solids vary from time to timein a given process. Emperical experienceby users should be the final guide.Alternate materials based on this aregenerally available.

4. Specify N3 diaphragm system for highcycle rate, high shock applications whereBuna-N and TCP are compatible with theprocess.

5. This table shows allowable minimum andmaximum temperature for o-rings.

6. M9 diaphragm system is suggested forsteam applications up to 400oF.

7. Dead bands are slightly higher when usingH, J, W, N3, or N6 series diaphragmoptions. Consult the factory.

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Adjustable Dead BandPressure Switches Step 5: Pressure Port

6V1-LA3-N6-C1A-YY

Step 6: Accessories

6V1-LA3-N6-C1A-YY

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Adjustable Dead BandPressure Switches Agency Listings

The following combinations only are available as approved, certified or listed by the agenciesshown. Some components are for products not offered in this catalog. Certain components orcombinations may acquire additional approval, certification or listing between print dates of thiscatalog. Contact the factory for the most current information.

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Adjustable Dead BandPressure Switches Glossary of Terms

SOR recognizes that there is no industry convention with respect to terminology and definitionspertinent to pressure switches. This glossary applies to SOR Pressure Switches.

Adjustable RangeThe span of pressure between upper and lowerlimits within which the pressure switch can beadjusted to actuate/deactuate.

Dead BandThe difference in pressure between theincreasing Set Point and decreasing Set Point.

Decreasing Set PointThat discrete pressure at which the pressureswitch is adjusted to deactuate on fallingpressure. It must fall within the adjustablerange.

Hermetically SealedA welded steel capsule with glass-to-metal,factory-sealed, electrical leads that isolatesthe electrical switching element(s) from theenvironment.

Increasing Set PointThat discrete pressure at which the pressureswitch is adjusted to actuate on rising pressure.It must fall within the adjustable range.

OverrangeThe maximum input pressure that can becontinuously applied to the pressure switchwithout causing permanent change of SetPoint, leakage or material failure.

Pressure SwitchA bi-stable electromechanical device thatactuates/deactuates one or more electricalswitching element(s) at a predetermineddiscrete pressure/vacuum (Set Point) uponrising or falling pressure/vacuum.

Proof PressureThe maximum input pressure that can becontinuously applied to the pressure switchwithout causing leakage or catastrophicmaterial failure. Permanent change of SetPoint may occur, or the device may berendered inoperative.

RepeatabilityThe ability of a pressure switch to successivelyoperate at a Set Point that is approached froma starting point in the same direction andreturns to the starting point over threeconsecutive cycles to establish a pressureprofile. The closeness of the measured SetPoint values is normally expressed as apercentage of full scale (maximum adjustablerange pressure).

SPDT Switching ElementSingle-Pole, Double Throw (SPDT) has threeconnections: C — Common, NO — NormallyOpen and NC — Normally Closed, which allowsthe switching element to be electricallyconnected to the circuit in either NO orNC state.

DPDT Switching ElementDPDT is two synchronized SPDT switchingelements which actuate together at increasingSet Point and deactuate together at decreasingSet Point. Discrete SPDT switching elementsallow two independent circuits to be switched;i.e., one AC and one DC.

The synchronization linkage is factory set, andis not field adjustable. Synchronization isverified by connecting test lamps to theswitching elements and observing them go“On” simultaneously at actuation and “Off”simultaneously at deactuation


Adjustable Dead BandPressure Switches Dimensions

Dimensions in this catalog are for reference only. They may be changed without notice. Contactthe factory for certified drawings for a particular model number. Dimensions are expressed asmillimeters over inches (Linear = mm/in.).

Pipe Mounting Kit: PK

Junction Box with Terminal Block: TB

141.25.56

70.62.78

(Typical)7.90.31 Diameter

(2 Places)

78.53.09

(Typical)

*167.16.58

93.73.69

22.40.88

9.90.39

3/4” NPT(M) CloseNipple Attached toStandard 3/4” NPT(F)Electrical ConduitConnection

3/4’ NPT(F) ElectricalConnection (3 Places)

Holes for 5/16” DiameterMounting HardwareFurnished with U-Boltsfor Mounting to 1-1/2”to 2” Pipe

Pressure PortSide

Switch MountingHoles (Typical 4)

C Switch Mounting HolesL

(PipeReference)

133.45.25

50.82.00

40.51.59

7.40.29

71.42.81

31.01.22

71.42.81

95.33.75

11.90.47

Perpendicular Mounting Parallel Mounting

*Dimension shown is approximate and based on a 5-thread engangement.


Dimensions


Junction Box with Terminal Block: HT

Dimensions shown are for reference only.Contact the factory for certified dimension drawings.

Shipping Weights

Actual shipping weights may vary from the charted values because of product material,configuration and packaging requirements.

108.04.25

HT and HB: 1/2” NPT(F)HBME: M20 x 1.5 (F)

54.02.13

69.92.75

Instrument Connection

Remove Cover forScrew Terminal Access

Cover Locking Screw

89.43.52

58.62.31

43.61.72

2.40.09

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Non-Hazardous LocationsWeathertight NEMA 4, 4X, IP65Housing Designator: V1

Housing Dimensions


*Add 6.4 for all non-aluminum ports. 0.25

Hazardous LocationsContains Explosion Proof, Hermetically Sealed Switching Element Capsule: UL Listed, CSA Certified Class I, Group A, B,C, D; Class II, Group E, F, G; Divisions 1 & 2

Housing Designator: V3

*Add 6.4 for all non-aluminum ports. 0.25

Dimensions in this catalog are for reference only. They may be changed without notice. Contactthe factory for certified drawings for a particular model number. Dimensions are expressed asmillimeters over inches (Linear = mm/in.).

138.95.47

69.62.74

*185.77.31

*70.42.77

57.22.25

114.34.5 70.1

2.76

27.71.09

9.70.38

26.21.03

ElectricalConnection

3/4” NPT(F)

Pressure Port

9/32 DiameterMounting Holes(Typical 2)

Electrical Connection3/4” NPT(F)

(Factory SealedWire Leads)

138.95.47

69.62.74

*217.48.56

*70.42.77

114.34.50

57.22.25 70.1

2.76

27.71.09Pressure Port

9/32 DiameterMounting Holes(Typical 2)

26.31.03


Notes


Process Instrumentation

SOR INC.14685 West 105th StreetLenexa, Kansas 66215

Phone 913-888-2630Toll Free 800-676-6794Fax 913-888-0767

www.sorinc.com

Registered Quality System to ISO 9001 Form 281 (04.02) Printed in U.S.A.

281 adjustable dead band pressure switchfile.yizimg.com/4338/2005429112092811482133.pdfactuation...

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