Form 279 (04.16) ©SOR Inc. 1/12

Principles of Operation

Opposed Piston Differential Pressure Switches

General Instructions

Registered Quality System to ISO 9001

A = Hi Pressure PistonB = Lo Pressure PistonFh = Force, Hi PressureFl = Force, Lo PressureFs = Force, Range SpringFd = Force Resultant Differential (Hi–Lo)

Design and specifications are subject to change

without notice.

For latest revision, go to SORInc.com

Table of ContentsPrinciples of Operation ....................... 1

Installation ...................................... 2

SIL Installation ................................. 2

Process Connection ........................... 3

Electrical Connection .......................... 3

Calibration ...................................... 3

Dimensions ..................................... 4

ATEX Marking Information ................... 10

Declaration of Conformity ................... 11

Basic construction is opposing diaphragm sealed pistons connected by a common shaft. Hi side system pressure acts on Piston A to produce force Fh. It is counteracted by adjustable range spring force Fs. Lo side system pressure acts on Piston B to produce force Fl. The resultant force corresponds to the difference in pressure between the Hi and Lo system pressures plus the force of the adjustable range spring, and moves the trip lever to actuate and deactuate the SPDT electrical switching element.

NOTE: If you suspect that a product is defective, contact the factory or the

SOR Representative in your area for a return authorization number (RMA).

This product should only be installed by trained and competent personnel.

These instructions provide information for installation, electrical connection, process connection and calibration of SOR® Opposed Piston Differential Pressure Switches.

2/12 Form 279 (04.16) ©SOR Inc.

Installation

This type of differential pressure switch can be installed in any position.

WEATHERTIGHT HOUSING

Attach the device to a suitable surface or pipe stanchion bracket with two 1/4-inch diameter bolts. Line mounting by either process or electrical connection is not recommended.

EXPLOSION PROOF HOUSING

Attach the device to a suitable surface or pipe stanchion bracket with two 1/4-inch diameter bolts. The TA housing must be attached with 2-inch U-bolts over the housing hubs or two 1/4 in. diameter bolts. Line mounting by either process or electrical connection is not recommended.

NOTE: When mounting to an irregular or uneven surface, install rubber washers on the bolts

between the housing and the mounting surface to prevent housing deformation.

If a breather drain is installed, the device should be mounted with the

breather drain pointing downward (6 o’clock) so condensation will drain

from the housing.

Failure to mount the housing on a fl at mounting surface may result in

torsional forces on the housing that could cause false trips or render the

pressure switch inoperative.

There are only three wetted parts on the Hi and Lo process connections: pressure port, diaphragm and o-ring. A metal diaphragm may be welded to the pressure port for certain applications, thereby eliminating the o-ring.This force-balance system virtually eliminates friction and resultant wear while yielding excellent repeatability.

These differential pressure switches are well suited for a variety of process applications. They are not intended for high pressure, fluid power (hydraulic) applications where high shock pressures and high cycle rates are expected.

Safety Integrity Level (SIL) Installation Requirements

The SOR pressure switches have been evaluated as Type-A safety related hardware. To meet the necessary installation requirements for the SIL system, the following information must be utilized:

Proof Test Interval shall be one year. Units may only be installed for use in Low Demand Mode. Products have a HFT (Hardware Fault Tolerance) of 0, and were evaluated in a

1oo1 (one out of one) configuration. Form 1538 (03.12) ©2012 SOR Inc.

Form 279 (04.16) ©SOR Inc. 3/12

Calibration

Process Connection

Pressure ports are marked Hi and Lo to indicate the high and low process pressure connec-tions. Connect process piping accordingly. Use two wrenches-one to hold the hex pressure port to prevent it from moving, the other to tighten the process pipe or tube fitting.

Care should be taken not to loosen the pressure port from the body or the

body from the housing.

Ensure that wiring conforms to all applicable local and national electrical codes and install unit(s) according to relevant national and local safety codes.

SOR Opposed Piston Differential Pressure Switches in RB and RH housings have terminal blocks as standard. All other Opposed Piston Differential Pressure Switches have 18-inch 18 AWG color-coded wire leads. Storing excess wire or making wire lead splices inside the switch housing will interfere with switch operation.

Electrical Connection

2-SPDT

Blue (C)Black (NO)Red (NC)Yellow (C2)Brown (NO2)Orange (NC2)

Green (GND)Differential Pressure

No.2

Hi

No.1

Lo

SPDT

Blue (C)Black (NO)Red (NC)

Green (GND)Differential PressureHi

Lo

Units in Hazardous Locations – Prior to calibration, make sure that the work

area is declassifi ed before removing the explosion proof cover to calibrate

the unit. Failure to do so could result in severe personal injury or substantial

property damage.

Remove housing cover. First, calibrate the device as a gauge pressure switch, i.e. Lo side vented to atmosphere. Turn the set point adjusting nut located on the Hi side piston clockwise to increase the set point, or counterclockwise to decrease the set point.

Calibrate to simulated system operating pressure conditions for optimum performance, i.e.: connect Hi and Lo sides to suitable pressure sources and raise pressures

simultaneously to expected system operating pressure at desired set point. Vary Lo side pressure and fine tune the set point adjustment for actuation (deactuation) of the electrical switching element on increasing or decreasing differential pressure at simulated system operating pressure. Replace the cover.

4/12 Form 279 (04.16) ©SOR Inc.

Dimensions

Linear = mm/inches

Drawing 0090262

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: S

Piston Number: 18

Weathertight-NEMA 4, 4X, IP65

CLEARANCE SLOTS FOR 6.40.25

HARDWARE WITH 63.52.50MIN TO 76.2

3.00MAX MOUNTING HOLES

*230.69.08

*57.42.26

A

107.34.22

52.02.05

69.92.75

33.31.31

ELECTRICALCONNECTION

SEE CHART

94.53.72

28.61.13

26.21.03

7.10.28

40.51.59

44.11.74

71.42.81

95.33.75

37.31.47

71.42.81133.45 25

50.82.00

PROCESSCONNECTION SIZE L

1/4 NPTMSHOWN

1/2 NPTM

PROCESS

1/4 OR 1/2 NPTMPROCESS CONNECTION(OPTIONAL: HI, LO OR BOTH)

PROCESSCONNECTION

(LOW)

PROCESSCONNECTION

(HIGH)

PIPE KITOPTIONAL

Linear = mm/inches

Drawing 0090152

Housing Designator: RB, RH, RE

Piston Number: 18

Conventional Explosion Proof

Form 279 (04.16) ©SOR Inc. 5/12

ELECTRICALCONNECTION

SEE CHART

40.51.59

7.10.28

28.61.12

65.62.58

107.34.22

52.02.05

33.31.31

69.92.75

*230.69.08

*57.42.26

A

A

26.21.03

PROCESSCONN SIZE

* LENGPER PO

1/4 NPTF1/2 NPTF SHOW

1 NPTM 4ADD 1

LENGTH A

1/4 NPTMSHOWN

29.1.1

1/2 NPTM 38.91 5

1/4 OR 1/2 NPTMPROCESS CONNECTIONOPTIONAL: HI, LO, OR BOTH

2X 7.10.28

X 13.50.53

MOUNTING SLOTS

PROCESSCONNECTION

HI

PROCESSCONNECTION

LO

DETAIL 1 NPTMPROCESS CONNECTION

SCALE 0.38

ISO-9001

14685 W 105TH ST LENEXA, KS 66215 USA913-888-2630SORINC.COM

*230.69.08

*115.34.54

*74.92.95

A

161.16.34

322.312.69

120.74.75

6.70.26

20.60.81

79.43.12

6.40.25

40.41.59TYP

80.83.18TYP

71.12.80

142.35.60

4X

MOUNTINGHOLES

7.90.31

ELECTRICALCONNECTION3/4 NPTF STD1/2 NPTF OPT

OR PLUGGED OPT2 PLACES

PRODUCT CERTIFICATION DRAWINGALL DIMENSIONS ARE ±1/16 INUNLESS OTHERWISE SPECIFIED

MMLINEAR = IN

DRAWN BY

K MITCHELLCHECKED BY

M SMITHENGINEER APPROVAL

S BOALDATE

28 MAR 2011THIS DRAWING IS THE EXCLUSIVE PROPERTY OF SOR.

NO USE WHATSOEVER OF THE INFORMATION CONTAINEDHEREON, NOR REPRODUCTION IN WHOLE OR PART MAY BE

MADE WITHOUT THE EXPRESS WRITTEN PERMISSION OF SOR.

TITLE

DIM DWG 15 & 17 S DP

EO NUMBER: 5090

SCALE: 0.75

DO NOT SCALE PRINT

DRAWING NUMBER REV

0090151 6

SHEET 1 OF 1DWG SIZ

B

PROCESSCONN SIZE * LENGTH

1/4 NPTM1/2 NPTM SHOWN

1 NPTM 46.0ADD 1.81

LENGTH A

1/4 NPTMSHOWN

29.71.17

1/2 NPTM 38.91 53

DETAIL1 NPTM

PROCESS CONNECTIONSCALE 0.38

1/4 OR 1/2 NPTMPROCESS CONNECTIONOPTIONAL: HI, LO OR BOTH

PROCESSCONNECTION

LO

PROCESSCONNECTION

HI

Linear = mm/inches

Drawing 0090265

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: S

Piston Number: 15, 17

Weathertight-NEMA 4, 4X, IP65

Linear = mm/inches

Drawing 0090151

Housing Designator: RB, RH, RE

Piston Number: 15, 17

Conventional Explosion Proof

6/12 Form 279 (04.16) ©SOR Inc.

Linear = mm/inches

Drawing 0090263

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: S

Piston Number: 13, 14, 16

Weathertight-NEMA 4, 4X, IP65

Linear = mm/inches

Drawing 0090150

Housing Designator: RB, RH, RE

Piston Number: 13, 14, 16

Conventional Explosion Proof

28.61.12

64.92.56

26.21.03

7.10.28

CLEARANCE SLOTS

FOR 6.40.25 HARDWARE

WITH 63.52.5 MIN

TO 76.23.00 MAX

MOUNTING HOLES

40.51.59

33.31.31

69.92.75

52.02.05

107.34.22

*54.72.15

*225.38.87

A CONN1

1

PROCESSCONN SIZ

1/4 OR 1/2 NPTMPROCESS CONNECTIONOPTIONAL: HI, LO OR BOTH

ELECTRICALCONNECTION

SEE CHART

PROCESSCONNECTION

HI

PROCESSCONNECTION

LO

6.40.25

20.60.81

79.43.12

40.41.59TYP

80.83.18TYP

4X

MOUNTINGHOLES

7.90.31

71.12.80

142.35.60

*72.22.84

*112.64.43

*225.38.87

A

2X ELECTRICALCONNECTION3/4 NPTF STD1/2 NPTF OPTOR PLUGGED OPT

PRODALLUN

NOHER

MAD

TITLE

DIMENS13, 14 &

EO NUM

PRCON

1/4

1/2

3/4

1/4 OR 1/2 NPTMPROCESS CONNECTIONOPTIONAL: HI, LO OR BOTH

PROCESSCONNECTION

HI

PROCESSCONNECTION

LO

Form 279 (04.16) ©SOR Inc. 7/12

Linear = mm/inches

Drawing 0090109

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: TA

Piston Number: 18

Conventional Explosion Proof

Linear = mm/inches

Drawing 0090248

Housing Designator: SC

Piston Number: 18

Conventional Explosion Proof

A

*240.29.46

*121.74.79

*67.72.67

54.02.13(TYP)

108.04.25(TYP) 73.7

2.90

147.15.79

MOUNTING

HOLE (TYP 4)

7.10.28

8.70.34

ELECTRICALCONNECTION

3/4 NPT(F)(STD)1/2 NPT(OPT)

OR PLUGGED(OPT)(TYP 2)

13.20.52

34.01.34

119.64.71

1/4 OR 1/2 NPTMALE PROCESS CONNECTION(OPTIONAL: HI, LO OR BOTH)

PROCESSCONNECTION

(HIGH)

PROCESSCONNECTION

(LOW)

LENGTH A29.71/4 NPT(M) = (SHOWN)1.1738.91/2 NPT(M) = 1.53

8/12 Form 279 (04.16) ©SOR Inc.

Linear = mm/inches

Drawing 0090111

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: TA

Piston Number: 15, 17

Conventional Explosion Proof

Linear = mm/inches

Drawing 0090157

Housing Designator: SC

Piston Number: 15, 17

Conventional Explosion Proof

*240.29.46

*67.72.67

*121.74.79

A

142.95.63

71.42.81

34.01.34

106.44.19

8.70.34

54.02.13(TYP)

108.04.25(TYP)

MOUNTING

HOLE (TYP 4)

7.10.28

ELECTRICALCONNECTION

3/4 NPT(F)(STD)1/2 NPT(F)(OPT)

OR PLUGGED(OPT)(TYP 2)

1/4 OR 1/2 NPTMALE PROCESS CONNECTION(OPTIONAL: HI, LO OR BOTH)

PROCESSCONNECTION

(HIGH)

PROCESSCONNECTION

(LOW)

LENGTH A29.71/4 NPT(M) = (SHOWN)1.1738.91/2 NPT(M) = 1.53

Form 279 (04.16) ©SOR Inc. 9/12

Linear = mm/inches

Drawing 0090112

Dimensions are for reference only. Contact the factory for certified drawings for a particular model number.

Housing Designator: TA

Piston Number: 13, 14, 16

Conventional Explosion Proof

Linear = mm/inches

Drawing 0090156

Housing Designator: SC

Piston Number: 13, 14, 16

Conventional Explosion Proof

142.95.63

71.42.81

MOUNTING

HOLE (TYP 4)

7.10.28

*65.02.56

*119.04.68

*234.89.24

A

54.02.13(TYP)

108.04.25(TYP)

8.70.34

34.01.34

106.44.19

ELECTRICALCONNECTION

3/4 NPT(F)(STD)1/2 NPT(F)(OPT)

OR PLUGGED(OPT)(TYP 2)

1/4 OR 1/2 NPTMALE PROCESS CONNECTION(OPTIONAL: HI, LO OR BOTH)

PROCESSCONNECTION

(LOW)

PROCESSCONNECTION

(HIGH)

LENGTH A29.71/4 NPT(M) = (SHOWN)1.1738.91/2 NPT(M) = 1.53

10/12 Form 279 (04.16) ©SOR Inc.

ATEX Marking Information

Sample Nameplate Drawing 0720044

Manufacturer’sRegistered Trademark

ATEX Listing Information

Product Model Identification

Serial Number (First Two

Numbers Indicate Year of Manufacture)

NOTE: The unit conforms to the requirements of clause 6.3.12, EN 60079-11: 2007. The unit

is capable of withstanding a 500 Vrms isolation test between circuit and enclosure.

Form 279 (04.16) ©SOR Inc. 11/12

Declaration of Conformity

For ATEX Certifi ed Models

R Series Pressure Switches

SOR Inc.14685 West 105th StreetLenexa, Kansas 66215-2003United States of America April 20, 2016

ATEX Directive (2014/34/EU) Equipment Intended for use in Potentially Explosive Atmospheres EN 60079-0: 2012 EN 60079-11: 2012

II 2 G Ex ia IIC T6...T4 Gb T6 (-40°C Ta 75°C) T5 (-40°C Ta 90°C) T4 (-40°C Ta 125°C)

EC-Type Examination CertificateBaseefa11ATEX0125Issued February 16, 2012

Baseefa Ltd. (Notified Body No. 1180)Rockhead Business Park, Staden Lane,Buxton, Derbyshire SK17 9RZUnited Kingdom

Baseefa Customer Reference No. 1021

Michael J. Bequette (VP of Engineering)

Form 1539 (04.16) SOR Inc.

Product

Manufacturer

Date of Issue

We declare that the above products conform to

the following specifications and directives

Carries the marking

Reference document

ATEX Notified Body

Person responsible

EC Declaration of Conformity

14685 West 105th Street, Lenexa, KS 66215-2003

Engineered to Order with Off-the-Shelf Speed

Michael J. Bequette

12/12 Form 279 (04.16) ©SOR Inc.

14685 West 105th Street, Lenexa, KS 66215 913-888-2630 800-676-6794 USA Fax 913-888-0767

Registered Quality System to ISO 9001

SORInc.com