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SOR

Adjustable Dead Band Weatherproof Pressure Switch (V1 Series)

Name: Adjustable Dead Band Weatherproof Pressure Switch (V1 Series)
Brand: SOR

The SOR V1 Series Adjustable Dead Band Weatherproof Pressure Switch is an industrial-grade, cost-effective pressure control instrument designed for demanding non-hazardous environments where wide and independently adjustable dead bands are required between increasing and decreasing set points. Utilizing SOR's field-proven dual force-balance Static O-Ring pressure sensing mechanism, process media pressure acts against two independent piston assemblies and range springs, actuating a precision mechanical lever that drives an electrical snap switch. This independent dual-adjustment architecture enables engineers to set high cut-in and low cut-out thresholds across broad spans, eliminating rapid pump short-cycling, compressor chattering, and system hunting in water supply, cooling towers, hydraulic power units, lubrication skids, and chemical transfer systems. Built with a rugged NEMA 4, 4X, and IP65 copper-free cast aluminum housing, screw terminal block wiring, wide wetted diaphragm metallurgy options (316L SS, Monel, Hastelloy, Buna-N, Viton, Kalrez), IEC 61508 SIL 2 safety certification, and backed by SOR's 3-year manufacturer warranty.

Independent field adjustments for increasing (actuation) and decreasing (deactuation) set points across wide spans

Prevents pump short-cycling, compressor motor burnout, and control valve chattering in automated fluid circuits

Dual force-balance Static O-Ring sensing mechanism delivers exceptional repeatability (±1% of span) and high overrange protection

Adjustable pressure spans available from 5 psi to 1,750 psi (0.35 bar to 120 bar) across 6 piston/spring combinations

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Adjustable Dead Band Weatherproof Pressure Switch (V1 Series)

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Adjustable Set Point Span5 to 1,750 psi (0.35 to 120 bar) across 6 piston/spring ranges

Repeatability±1% of full adjustable span

Enclosure ProtectionNEMA 4, 4X, IP65 Weatherproof (Copper-free 356 Cast Aluminum)

Switching ElementLA Series SPDT Snap Switch (15A @ 250 VAC, 10A @ 30 VDC) with Terminal Block

Process Connection1/4" NPT Female standard | 1/2" NPT Female optional (316SS or Aluminum)

Conduit Connection3/4" NPT Female

Overrange / Proof PressureOverrange up to 2,500 psi (170 bar) | Proof up to 3,875 psi (267 bar)

Ambient Temperature Limit-30 °F to 180 °F (-34 °C to 80 °C)

Safety & Quality ApprovalsIEC 61508 SIL 2 Certified, CSA Certified (opt. CS), ISO 9001 Registered

Standard WarrantySOR 3-Year Limited Warranty

Engineering Specifications & Selection Matrix

SOR V1 Series Adjustable Dead Band Weatherproof Pressure Switch Technical Guide

Configure your SOR V1 adjustable dead band switch by selecting the piston/spring range, switching element, diaphragm & O-ring elastomers, pressure port metallurgy, and optional accessories.

Adjustable Span5 to 1,750 psi (0.35 to 120 bar)

EnclosureNEMA 4, 4X, IP65 Cast Aluminum

Switch ContactSPDT 15A @ 250 VAC / 10A @ 30 VDC

Safety RatingSIL 2 / CSA / 3-Year Warranty

Piston & Spring Adjustable Range Selection

1-4Piston 1, Spring 4: Increasing 5 to 25 psi | Decreasing 1 to 21 psi (Proof 1,000 psi)

4-3Piston 4, Spring 3: Increasing 10 to 80 psi | Decreasing 4 to 60 psi (Proof 2,500 psi)

5-3Piston 5, Spring 3: Increasing 20 to 240 psi | Decreasing 6 to 160 psi (Proof 2,500 psi)

9-4Piston 9, Spring 4: Increasing 50 to 450 psi | Decreasing 10 to 350 psi (Proof 3,875 psi)

9-5Piston 9, Spring 5: Increasing 100 to 1,000 psi | Decreasing 30 to 800 psi (Proof 3,875 psi)

9-45Piston 9, Spring 45: Increasing 200 to 1,750 psi | Decreasing 80 to 1,500 psi (Proof 3,875 psi)

Housing & Electrical Connection

V1Weathertight NEMA 4, 4X, IP65 356 Cast Aluminum, 3/4" NPT(F) conduit entry (4.0 lb / 1.8 kg)

Switching Element

LASPDT Snap Switch with Screw Terminal Block (15A @ 125/250 VAC, 10A @ 30 VDC resistive, 180 °F max)

Diaphragm & O-Ring Wetted Materials

N4TCP (Teflon-Coated Polyimide) Diaphragm + Buna-N O-Ring (-30 °F to 200 °F) [Standard]

N1TCP Diaphragm + Viton O-Ring (32 °F to 400 °F)

N6TCP Diaphragm + Kalrez FFKM O-Ring (5 °F to 400 °F)

M4316L Stainless Steel Diaphragm + Viton O-Ring (32 °F to 400 °F)

M2316L Stainless Steel Diaphragm + Buna-N O-Ring (-30 °F to 200 °F)

M9316L Stainless Steel Diaphragm + EPR O-Ring (-30 °F to 200 °F / Steam to 400 °F)

A4Monel Diaphragm + Viton O-Ring (32 °F to 400 °F)

H4Hastelloy C Diaphragm + Viton O-Ring (32 °F to 400 °F)

Pressure Port Connection & Material

C1A1/4" NPT Female, 316 Stainless Steel (CF-8M Casting)

C2A1/2" NPT Female, 316 Stainless Steel (CF-8M Casting)

B1A1/4" NPT Female, 356 Cast Aluminum Alloy

B2A1/2" NPT Female, 356 Cast Aluminum Alloy

Accessories & Optional Features

CSCSA Certified Pressure Switch with Internal Ground Lug

MMVacuum Protector Plate (protects diaphragm against intermittent vacuum > 10 inHg)

NCNACE MR0175 / ISO 15156 Compliance Certification

PKPipe / Stanchion Mounting Kit (1-1/2" to 2" Pipe)

PY316 Stainless Steel Tag with 304SS Wire

YYExterior Polyimide Epoxy Coating with 316SS Pigment (200 hr salt spray)

ZZChained Cover with Captive Stainless Steel Screws

SOR Model Number Architecture

5V1-LA3-N4-C1A-YY

5PistonPiston #5 (High-cycle force balance)

V1HousingWeathertight NEMA 4, 4X, IP65 Cast Aluminum

LASwitchSPDT 15A @ 250 VAC with Terminal Block

3SpringRange Spring #3 (20 to 240 psi increasing)

N4Diaphragm/O-RingTCP Diaphragm with Buna-N O-Ring

C1APressure Port1/4" NPT Female 316SS Casting

YYAccessoriesExterior Polyimide Epoxy Coating

Technical specifications

Adjustable Set Point Span5 to 1,750 psi (0.35 to 120 bar)

Repeatability±1% of full adjustable span

Enclosure RatingNEMA 4, 4X, IP65 Weatherproof (356 Cast Aluminum)

Switch Contact FormSPDT Snap Switch (15A @ 125/250 VAC, 10A @ 30 VDC)

Process Connection1/4" NPT(F) standard | 1/2" NPT(F) optional (316SS or Aluminum)

Conduit Connection3/4" NPT Female

Maximum Overrange PressureUp to 2,500 psi (170 bar)

Proof PressureUp to 3,875 psi (267 bar)

Ambient Temperature Range-30 °F to 180 °F (-34 °C to 80 °C)

WeightApprox. 4.0 lb (1.8 kg)

Safety Integrity LevelSIL 2 Certified (IEC 61508) for SIS circuits

WarrantySOR 3-Year Limited Manufacturer Warranty

Application & Installation Guidelines

Set increasing and decreasing set points independently using the internal adjusting nuts and engraved reference scales.

Ensure decreasing set point is calibrated below the increasing set point within the acceptable range envelope.

For steam service up to 400 °F (204 °C), select the M9 wetted system (316L SS diaphragm + EPR O-ring) and install a pigtail siphon.

Use the MM vacuum protector plate if the switch will be subjected to intermittent vacuum conditions greater than 10 inHg.

Product Overview & Working Principle

The SOR V1 Series Adjustable Dead Band pressure switch provides precise, field-configurable control when an application requires an intentional, wide differential between the rising set point (cut-in) and falling set point (cut-out). Unlike conventional switches where dead band is fixed or strictly proportional, the SOR design incorporates two independent Static O-Ring pressure sensing assemblies acting upon a precision force-balance lever mechanism.

As process media enters the single process port, pressure acts uniformly across both piston areas against their respective range springs. Each spring is calibrated via an independent adjusting nut with a visual calibration scale. When increasing pressure reaches the high set point, the primary piston moves the lever to actuate the electrical switch. As pressure subsequently drops, the lever remains latched in the actuated position until pressure falls below the lower set point, where the secondary piston allows the lever to deactuate.

Dual static O-ring force-balance technology isolates process pressure without dynamic seal friction or mechanical hysteresis

Eliminates auxiliary control relays, dual pressure switches, and complex PLC timer logic in simple pump/tank level controls

Independent top and bottom thumb adjustments with engraved calibration scales for quick, precise field calibration

Extremely high proof pressure ratings protect switch components from hydraulic shock, water hammer, and pump startup surges

Vibration-resistant lever pivot geometry ensures rock-solid set point stability near vibrating machinery and engines

Adjustable Span & Piston/Spring Range Guide

Range 1-4 (Piston 1, Spring 4)Increasing: 5 to 25 psi | Decreasing: 1 to 21 psi | Overrange: 750 psi | Proof: 1,000 psi

Range 4-3 (Piston 4, Spring 3)Increasing: 10 to 80 psi | Decreasing: 4 to 60 psi | Overrange: 1,500 psi | Proof: 2,500 psi

Range 5-3 (Piston 5, Spring 3)Increasing: 20 to 240 psi | Decreasing: 6 to 160 psi | Overrange: 1,500 psi | Proof: 2,500 psi

Range 9-4 (Piston 9, Spring 4)Increasing: 50 to 450 psi | Decreasing: 10 to 350 psi | Overrange: 2,500 psi | Proof: 3,875 psi

Range 9-5 (Piston 9, Spring 5)Increasing: 100 to 1,000 psi | Decreasing: 30 to 800 psi | Overrange: 2,500 psi | Proof: 3,875 psi

Range 9-45 (Piston 9, Spring 45)Increasing: 200 to 1,750 psi | Decreasing: 80 to 1,500 psi | Overrange: 2,500 psi | Proof: 3,875 psi

Switching Element & Electrical Ratings

LA Switching Element (Standard)SPDT Snap Switch with Internal Screw Terminal Block, 15A @ 125/250 VAC, 0.5A @ 125 VDC, 10A @ 30 VDC

Max Ambient Temperature180 °F (80 °C) continuous ambient rating for LA element

Conduit Entry3/4" NPT Female single electrical conduit connection with generous wiring space

Contact MetallurgyHeavy-duty silver alloy contacts standard for high inrush inductive motor starter coils

Diaphragm & O-Ring Wetted Materials

N4 System (Standard)TCP (Teflon-Coated Polyimide) Diaphragm + Buna-N O-Ring (-30 °F to 200 °F) for air, water, lube oil

N1 SystemTCP Diaphragm + Viton O-Ring (32 °F to 400 °F) for hot petroleum oils and hydrocarbon fuels

N6 SystemTCP Diaphragm + Kalrez FFKM O-Ring (5 °F to 400 °F) for aggressive solvents and aromatic chemicals

M4 System316L Stainless Steel Diaphragm + Viton O-Ring (32 °F to 400 °F) for corrosive process fluids

M2 System316L Stainless Steel Diaphragm + Buna-N O-Ring (-30 °F to 200 °F) for general hydraulic and process oil

M9 System316L Stainless Steel Diaphragm + EPR O-Ring (-30 °F to 200 °F, steam to 400 °F) for steam and boiler condensate

A4 / A6 SystemMonel Diaphragm with Viton or Kalrez O-Rings for seawater, marine atmospheres, and sour gas

H4 / H6 SystemHastelloy C Diaphragm with Viton or Kalrez O-Rings for strong mineral acids and halogens

Model Number Structure & Ordering Tree

SOR pressure switches utilize a modular 7-position model number tree: [1. Piston] - [2. Housing] - [3. Switching Element] - [4. Range Spring] - [5. Diaphragm & O-Ring] - [6. Pressure Port] - [7. Accessories].

Example Model Number: 5V1-LA3-N4-C1A-YY represents Piston 5, V1 Weatherproof Housing, LA SPDT Snap Switch with Terminal Block, Spring 3 (20-240 psi range), N4 Standard TCP/Buna wetted seals, 1/4" NPT(F) 316SS process port, and YY Polyimide Epoxy external coating.

Step 1 & 4 (Piston & Spring)1-4 (5-25 psi), 4-3 (10-80 psi), 5-3 (20-240 psi), 9-4 (50-450 psi), 9-5 (100-1000 psi), 9-45 (200-1750 psi)

Step 2 (Housing)V1: Weathertight NEMA 4, 4X, IP65 356 Cast Aluminum (3/4" NPT conduit)

Step 3 (Switching Element)LA: SPDT 15A @ 250 VAC with screw terminal block

Step 5 (Diaphragms/O-Rings)N4 (TCP/Buna), N1 (TCP/Viton), N6 (TCP/Kalrez), M4 (316SS/Viton), M2 (316SS/Buna), A4 (Monel), H4 (Hastelloy C)

Step 6 (Pressure Port)C1A: 1/4" NPT(F) 316SS | C2A: 1/2" NPT(F) 316SS | B1A: 1/4" NPT(F) Aluminum | B2A: 1/2" NPT(F) Aluminum

Step 7 (Popular Options)CS (CSA Certified), MM (Vacuum Protector), NC (NACE MR0175), PK (Pipe Mount Kit), PP (Fiber Tag), PY (316SS Tag), YY (Epoxy Coat)