Adjustable Dead Band Pressure Switches

Adjustable Dead Band Pressure Switches
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Adjustable Dead Band Pressure Switches
The adjustable dead band
pressure switch should be used when there is a
requirement for an adjustable and wide dead band
between the increasing and decreasing set points.
Function
Alarm: Hi — Lo
Control: On — Off
V1 Weathertight Housing
Features and Benefits
V3 Weathertight
Explosion Proof
Hermetically Sealed Switches
Design and specifications are
subject to change without notice.
For latest revision, see www.sorinc.com.
• 3-year warranty from date of manufacture
• Safety Certified to IEC 61508 (SIL) SOR products are certified to IEC 61508 for non-redundant use in SIL1 and SIL2 Safety Instrumented Systems for most models. For more details or values
applicable to a specific product, see the Safety Integrity Level Quick Guide (Form 1528).
• 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 and containment
Form 281 (12.15) ©SOR Inc.
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1/16
Adjustable Dead Band
Pressure Switches
Principle
The SOR Adjustable Dead Band pressure switch incorporates two industry proven Static “O” Ring pressure sensing
elements. Media pressure on the areas of the pistons counteracts the forces of the range springs — each
adjustable by a separate adjusting nut — and moves the piston shafts to operate the lever assembly which, in
turn, actuates and deactuates the electrical switching element. Each pressure sensing element of the Adjustable
Dead Band pressure switch is a force balance piston-actuated assembly sealed by a flexible diaphragm and
an o-ring that is static. The only wetted parts are the single pressure port, two diaphragms, and two o-rings all
indicated with asterisks (*) in this illustration.
Electrical Switching
Element (Explosion Proof
Model has Hermetically
Sealed Switching Element
Capsule)
Screw Terminal Block
(Weathertight Model Only)
Lever Assembly
Calibration Scale
Calibration Scale
Housing
Increasing Set Point
Adjusting Nut
Decreasing Set Point
Adjusting Nut
Piston Assembly
Piston Assembly
Pressure Range Spring
Pressure Range Spring
*Diaphragm
*Diaphragm
*O-Ring
*O-Ring
*Pressure Port
Principle Schematic
The lever assembly travel illustrated here has been exaggerated for clarity.
No Pressure: Electrical switching element is
deactuated.
Pressure greater than decreasing Set Point but
less than increasing Set Point. Electrical switching
element remains deactuacted.
Actuation
Pressure equal to or greater than
increasing Set Point: Electrical
switching element is actuated.
2/16
Deactuation
Pressure less than increasing Set
Point but greater than decreasing
Set Point: Electrical switching
element remains actuated.
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Pressure equal to or less than
decreasing Set Point: Electrical
switching element is deactuated.
Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
How to Order
Model Number System
5V1-LA3-N6-C1A-YY

Housing
Switching
Element

Diaphragm
Pressure Port
Accessories
How to Order
Information and data in this catalog are formatted to provide a convenient guide to assist
instrument engineers, plant engineers and end users in selecting pressure switches for their
unique 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 for
components that must be specified.
Form 281 (12.15) ©SOR Inc.
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Adjustable Dead Band
Pressure Switches
Step 1: Adjustable Range
5V1-LA3-N6-C1A-YY
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 checking
increasing and decreasing Set Point requirements against the tables. In the example below,
a contact closure is required when pressure increases to 160 psi. The same contact must
open when pressure decreases to 60 psi. Since 60 psi is within the blue field, the example
grid range is correct for the application.
When the correct range grid is selected, insert range designators  and  from that grid into the
model number.
Step 1
Find the specified increasing Set Point at the top of the graph.
Increasing Set Point (psi)
80
200
100
120
160
200
240
Step 2
Find the specified
decreasing Set
Point along the left
edge of the graph.
Decreasing Set Point (psi)
5-3
160
Step 3
Following the vertical line
down from the increasing
Set Point.
Follow the horizontal line
across from the
decreasing Set Point.
Any point within the blue
field is acceptable.
120
80
40
20
0
1
5
2
3
5V1-LA3-N6-C1A-YY
1st and 4th places in model number
4/16
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Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
Step 1: Adjustable Range
5V1-LA3-N6-C1A-YY
Increasing Set Point (psi)
9
5
18
17
13
21
25
Overrange 750 psi 50 bar
Proof 1000 psi 70 bar
80
Decreasing Set Point (psi)
Decreasing Set Point (psi)
22
Increasing Set Point (psi)
14
10
80
6
40
20
30
0
1
4
2
60
40
20
0
4
1
100
120
160
200
240
150
350
Decreasing Set Point (psi)
160
120
80
40
20
1
Form 281 (12.15) ©SOR Inc.
5
2
300
SORInc.com
2
3
200
250
350
450
Overrange 2500 psi 170 bar
Proof 3875 psi 267 bar
200
100
50
0
3
6
Increasing Set Point (psi)
Overrange 1500 psi 100 bar
5-3
Proof
2500 psi 170 bar
Decreasing Set Point (psi)
100
Overrange 1500 psi 100 bar
Proof 2500 psi 170 bar
Increasing Set Point (psi)
0
80
10
2
80
200
60
40
1
9
2
4
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Adjustable Dead Band
Pressure Switches
Step 1: Adjustable Range
5V1-LA3-N6-C1A-YY
Increasing Set Point (psi)
400
600
800
Overrange 2500 psi 170 bar
Proof 3875 psi 267 bar
Increasing Set Point (psi)
1000
1500
Decreasing Set Point (psi)
Decreasing Set Point (psi)
300
800
600
900
1200
1500
1750
Overrange 2500 psi 170 bar
Proof 3875 psi 267 bar
1200
600
400
200
900
600
100
300
200
0
100
0
1
9
2
5
1
9
2
45
Step 2: Housing
5V1-LA3-N6-C1A-YY
Service
Non-Hazardous
Locations
Hazardous
Locations
(UL Listed/CSA Certified,
ATEX and SAA Approved
Snap Switch)
6/16
Description
Designator
Weathertight for non-hazardous service.
NEMA 4, 4X & IP65
Electrical conduit connection: 3/4” NPT(F)
Material: 356 aluminum
Use LA or SA switching element and terminal
block.
Shipping weight: 4 pounds (2 kgs)
See cutaway view on page 2; dimensions on
page 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 & 2
Electrical conduit connection: 3/4” NPT(F)
Material: 356 aluminum
Use AG switching element; hermetically sealed SS
capsule
Shipping weight: 5 pounds (2.5 kgs)
V3
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Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
Step 3: Switching Elements
5V1-LA3-N6-C1A-YY
Switching
Element
Service
Contact
Form
Electrical
Connection
Type
Normal
Service AC
Very High
Capacity
DC
Magnetic
Blow-out
AC or DC
SPDT
DPDT
Screw
Terminal
Block
18” 18 AWG
color-coded
wire leads
3/4” NPT(M)
conduit
connection
AC Rating
Designator
Volts
Amps
Volts
Amps
Volts
250
15
125
.5
30
10*
180
80
LA
N/A
-
-
180
80
SA
N/A
30
5.0
160
70
N/A
AG
125
10
125
1.5
Min.
10.0
Max.
250
11
125
.5*
1. The switching elements shown above are UL Listed and CSA Certified. The DC current rating marked (*) is not UL Listed but has been verified by testing and/or experienced.
2. The hermetically sealed switching element capsule is UL Listed, CSA Certified and SAA Approved as a snap switch in accordance with the following table.
3. Consult the factory for availability of SAA Approved units.
Form 281 (12.15) ©SOR Inc.
Maximum
Ambient
Temperature
DC Rating Resistive
Agency
Amps Deg F Deg C SPDT DPDT
Hazardous Location
Conditions
CSA Certified
Class I,
Group A, B, C, D;
Class II,
Group #, F, G;
Division 1 & 2
SAA Note 3
Approved
Ex s Zone 2 IIC T4 IP65
Ex tD A22 T105 °C IP65
ATEX Approved
II 2 G EEx m II
UL Listed
Designator
AG
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Adjustable Dead Band
Pressure Switches
Step 4: Diaphragm and O-Ring
5V1-LA3-N6-C1A-YY
Notes
1. N4 diaphragm system is standard. It is
normally suitable for air, oil, water and noncorrosive processes.
2. Other diaphragm and o-ring combinations
may be available. Consult the factory or the
SOR representative in your area for more
information.
3. Wetted parts have been selected as representing the most suitable commercially
available material for use in the service
intended. However, they do not constitute a
guarantee against corrosion or permeation,
since processes vary form plant to plant and
concentration of harmful fluids, gases or
solids vary from time to time in a given
process. Emperical experience by users
should be the final guide. Alternate materials
based on this are generally available.
4. Specify N3 diaphragm system for high cycle
rate, high shock applications where Buna-N
and TCP are compatible with the process.
5. This table shows allowable minimum and
maximum temperature for o-rings.
Viton
Kalrez
Viton
Kalrez
Viton
Kalrez
Viton
Kalrez
Diaphragm
(Wetted)
Designator
A4
Monel
A6
Hastelloy-B
Hastelloy-C
Carpenter-20
H4
H6
J4
J6
L4
L6
Viton GLT
M1
Buna-N
M2
Viton
M4
Neoprene
316L SS
M5
Kalrez
M7
Aflas
M8
EPR
M9 Note 6
Viton
N1
Buna-N
TCP
Teflon-Coated
Polyimide
N3 Note 4
O-Ring Material
°F
°C
Viton
32 to 400
0 to 204
Viton GLT
-20 to 400
-29 to 204
Kalrez
Kalrez*
5 to 400
-15 to 204
Kalrez
Kalrez
N6
Aflas
25 to 400
-4 to 204
EPR
-30 to 200
-34 to 93
Aflas
TCP
Teflon-Coated
Polyimide
N7
Buna-N
Neoprene EPR
TCP Teflon Coated
Polyimide
Diaphragm
Buna-N
Buna-N
P1
-30 to 400
-34 to 204
Neoprene
Neoprene
R1
Viton GLT
6. M9 diaphragm system is suggested for
steam applications up to 400oF.
7. Dead bands are slightly higher when using
H, J, W, N3, or N6 series diaphragm options.
Consult the factory.
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Buna-N
Viton
*Kalrez or equivalent
Perfluoroelastomer (FFKM) o-rings
8/16
O-Ring
(Wetted)
Neoprene
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N8
S1
Viton
S2
W2
Tantalum
Kalrez
EPR
Ethylene
Propylene
Note 1
N5
Buna-N
Viton
N4 Standard
W4
W5
W6
EPR
Ethylene Propylene
Y1
Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
Step 5: Pressure Port
5V1-LA3-N6-C1A-YY
Material
Connection
Designator
Aluminum Alloy 356
copper-free casting
1/4” NPT(F)
B1A
1/2” NPT (F)
B2A
1/4” NPT(F)
C1A
1/2” NPT (F)
C2A
316SS CF-8M Casting
Step 6: Accessories
5V1-LA3-N6-C1A-YY
Accessory / Option & Description
Designator
Wetted parts are cleaned for industrial oxygen service.
BB
CSA Certified pressure switch. Available with V1 housing. Housing has earth (ground) lug.
See agency listings on page 10 for details.
CS
Cemented cover gasket on weathertight housing.
GC
Universal terminal box, 1/2” NPT(F). 316SS. Explosion proof. FM Approved; CSA Certified.
See form 657 (Catalog GI-30).
HT
Vacuum protector plate retains diaphragm system in the pressure switch if subjected to
intermittent vacuum greater than 10 in Hg. If a pressure switch is subjected to continuous, rapid changes of vacuum, other protection may be available (consult factory). Material
matches or exceeds pressure port material.
MM
Compliance to NACE Certification MR0175/ISO 15156*
NC
Pipe (stanchion) mounting kit for (1-1/2” to 2” pipe). Order as a separate line item for CSA
Certified pressure switches.
PK
Tag, fiber. Attached with plastic wire to housing. Stamped with customer-specified tagging
information.
PP
Powder coat epoxy coating. No coating on stainless steel parts or plated screws.
(500 hours-salt spray)
PY
Tag, stainless steel. Attached with stainless steel wire to housing. Stamped with customer
specified tagging information. (2 lines, 18 characters and spaces per line.)
RR
Stainless steel piston and cylinder disc for corrosion resistance.
SP
Explosion proof and weathertight electrical junction box with screw terminals. Aluminum
3/4” NPT(F) top or right conduit connections as required. UL Listed and CSA Certified
Class I, Groups A, B, C & D; Class II, Group E, F & G; Division 1 & 2. Includes cover o-ring
for weathertight applications. (V3 housing only.)
TB
Oversize stainless steel nameplate. Permanently attached to housing. Stamped with
customer specified tagging information
TT
Fungicidal varnish. Covers exterior and interior except working parts.
VV
Epoxy coating. Exterior only. Polyimide epoxy with 316SS pigment. (200 hours-salt spray)
YY
Chained cover with captive screws to conform to former JIC specification
ZZ
“X” is used as a suffix to the model number for special requirements not keyed elsewhere in
the model number by an “X”. Each “X” must be completely identified in the text of the order
or inquiry. When more than one “X” is required, use “X” followed by the number of such
items. For example, “X3” means three separate, otherwise unidentifiable requirements.
Form 281 (12.15) ©SOR Inc.
SORInc.com
X
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Adjustable Dead Band
Pressure Switches
Certificates
C1
Calibration
¿
Hydrostatic Pressure Test
C2
C3
C4
C5
C6
C8
¿
Inspection Report
¿
Compliance / Conformance
Test Certificates
B1
B4
B5
B6
B7
A1
A2
A3
A4
A5
A6
A7
A8
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
Dielectric Test
¿
¿
¿
Insulation Resistance
¿
Typical Material of
Wetted Parts
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
¿
Agency Listings
The following combinations only are available as approved, certified or listed by the agencies shown. Some
components are for products not offered in this catalog. Certain components or combinations may acquire
additional approval, certification or listing between print dates of this catalog. Contact the factory for the most
current information.
CSA
10/16
Enclosure 4 (Weathertight)
Piston
Housing
Switching
Element
Spring
Diaphragm
& O-Ring
Pressure Port
Material &
Connection Size
Accessories/
Option
All
V1
LA, SA
All
All
All
CS Required
All except TB
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Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
Glossary of Terms
SOR recognizes that there is no industry convention with respect to terminology and definitions
pertinent to pressure switches. This glossary applies to SOR Pressure Switches.
Adjustable Range
The span of pressure between upper and lower
limits within which the pressure switch may be
adjusted to actuate/deactuate.
Dead Band
The difference in pressure between the
increasing Set Point and decreasing Set Point.
Decreasing Set Point
That discrete pressure at which the pressure
switch is adjusted to deactuate on falling
pressure. It must fall within the adjustable range.
Hermetically Sealed
A welded steel capsule with glass-to-metal,
factory-sealed, electrical leads that isolates
the electrical switching element(s) from the
environment.
Increasing Set Point
That discrete pressure at which the pressure
switch is adjusted to actuate on rising pressure.
It must fall within the adjustable range.
Overrange
The maximum input pressure that may be
continuously applied to the pressure switch
without causing permanent change of Set Point,
leakage or material failure.
Pressure Switch
A bi-stable electromechanical device that
actuates/deactuates one or more electrical
switching element(s) at a predetermined discrete
pressure/vacuum (Set Point) upon rising or
falling pressure/vacuum.
Form 281 (12.15) ©SOR Inc.
SORInc.com
Proof Pressure
The maximum input pressure that may be
continuously applied to the pressure switch
without causing leakage or catastrophic
material failure. Permanent change of Set
Point may occur, or destruction of the device
may be rendered inoperative.
Repeatability
The ability of a pressure switch to successively
operate at a Set Point that is approached from a
starting point in the same direction and
returns to the starting point over three
consecutive cycles to establish a pressure
profile. The closeness of the measured Set Point
values is normally expressed as a percentage of
full scale (maximum adjustable range pressure).
SPDT Switching Element
Single-Pole, Double Throw (SPDT) has three
connections: C — Common, NO — Normally
Open and NC — Normally Closed, which allows
the switching element to be electrically
connected to the circuit in either NO or
NC state.
DPDT Switching Element
DPDT is two synchronized SPDT switching
elements which actuate together at increasing
Set Point and deactuate together at decreasing
Set Point. Discrete SPDT switching elements
allow two independent circuits to be switched;
i.e., one AC and one DC.
The synchronization linkage is factory set, and is
not field adjustable. Synchronization is verified by
connecting test lamps to the switching elements
and observing them go “On” simultaneously at
actuation and “Off” simultaneously at deactuation.
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Adjustable Dead Band
Pressure Switches
Dimensions
Dimensions in this catalog are for reference only. They may be changed without notice. Contact the
factory for certified drawings for a particular model number. Dimensions are expressed as millimeters
over inches (Linear = mm/in.).
Drawing 0090300
Pipe Mounting Kit: PK
Drawing 0091353
Junction Box with Terminal Block: TB
12/16
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Form 281 (12.15) ©SOR Inc.
Adjustable Dead Band
Pressure Switches
Dimensions
Drawing 0090763
Junction Box with Terminal Block: HT
Weights
V1 Housing
V3 Housing
4 lbs (2 kgs)
5 lbs (2.5 kgs)
Accessory
Pk Pipe Kit
TB Junction box with
Terminal Block
Add lbs
kgs
1.5
0.7
5
2.25
Actual shipping weights may vary from the charted values because of product material,
configuration and packaging requirements.
Form 281 (12.15) ©SOR Inc.
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13/16
Adjustable Dead Band
Pressure Switches
Housing Dimensions
Dimensions in this catalog are for reference only. They may be changed without notice. Contact the
factory for certified drawings for a particular model number. Dimensions are expressed as millimeters
over inches (Linear = mm/in.).
Drawing 0090236
Non-Hazardous Locations
Weathertight NEMA 4, 4X, IP65
Housing Designator: V1
Drawing 0090325
Hazardous Locations
Contains Explosion Proof, Hermetically Sealed Switching Element Capsule: UL Listed, CSA Certified, ATEX and SAA Approved
Housing Designator: V3
14/16
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Form 281 (12.15) ©SOR Inc.
Notes
Form 281 (12.15) ©SOR Inc.
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SOR Inc. | Lenexa, KS USA | 913-888-2630 | Fax 913-888-0767 | SORInc.com
REGIONAL OFFICES
China
Middle East
SOR China | Beijing, China
SOR Measurement & Control Equipment Trading DMCC | Dubai, UAE
+86 (10) 5820 8767 | Fax +86 (10) 58 20 8770
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+971 4 278 9632 | Fax +971 4 279 8399
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Form 281 (12.15) ©SOR Inc.
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