SOR Weatherproof Low Range User Manual

Differential Pressure Switches
Explosion Proof
Series 20
General Instructions
Weatherproof
These instructions provide information for installation, electrical connection, process
®
connection and calibration of SOR
Series 20 Differential Principle Basic construction is a Static “O” Ring diaphragm and piston pressure sensor. Process pressure acts on the diaphragm to produce force Fh against the piston. Fh is counteracted by two forces: Fl, which comes from the Lo side Pressure port through the electrical housing, and Fs which comes from the adjustable range spring. Since the Lo side process media pressurizes the electrical housing, Lo side process media is limited to clean, dry air or inert gas.
Design and specifications are subject to change
without notice.
For latest revision,
go to sorinc.com
Series 20 Differential Pressure Switches.
Table of Contents
Installation .......................................2
SIL Installation ..................................2
Electrical Connection ...........................3
Calibration .......................................4
Dimensions ................................... 5-8
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.
Form 536 (08.13) ©SOR Inc.
Registered Quality System to ISO 9001
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When Fh exceeds the combination of Fl and Fs, the piston (and piston shaft) moves to actuate the electrical switching element.
There are only three wetted parts on the Hi side process connection: pressure port, diaphragm and o-ring.
F
I
NC
NO
C
The force-balance system
F
virtually eliminates friction and resultant wear while yielding excellent repeatability.
F
h
d
F
s
Series 20 Differential Pressure Switches are well suited for a variety
A
of process applications. They are not intended for high-pressure fluid power (hydraulic) applications where high-shock pressures and high-cycle rates are expected.
Installation
This type of differential pressure switch can be mounted in any position. Install low range models in the same orientation that they are calibrated.
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 The TA housing must be attached with 2-inch U-bolts over the housing hubs or two 1/4-inch diameter bolts. Line mounting by either process or electrical connection is not recommended.
Failure to mount the housing on a  at mounting surface may result in torsional forces on the housing that could cause false trips or render the pressure switch inoperative.
When mounting to an irregular or uneven surface, install rubber washers on the bolts between the housing and the mounting surface (except in high-vibration applications) to prevent housing deformation, which could change the relative positions of internal parts and affect calibration or render the device inoperative.
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.
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Form 1538 (03.12) ©2012 SOR Inc.
Form 536 (08.13) ©SOR Inc.
Electrical Connection
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 Series 20 Differential Pressure Switches have 18”, 18-AWG, color-coded wire leads which extend switching element contact circuits through a glass-to-metal seal. The glass-to-metal seal assembly maintains Lo side pressure containment. Use two wrenches, one on the seal assembly and one on the conduit fitting to avoid movement of the seal assembly during installation.
Wiring Schematic
SPDT
No.1
LO
Differential Pressure
HI
2-SPDT
LO
No.2
Differential Pressure
HI
Blue (C) Black (NO) Red (NC)
Green (GND)
Blue (C) Black (NO) Red (NC) Yellow (C2) Brown (NO2) Orange (NC2)
Green (GND)
Form 536 (08.13) ©SOR Inc.
3/8
Calibration
Before removing the cover during test or while the unit is in service, relieve pressure inside the housing by venting Lo side pressure to atmosphere. When replacing the cover, tighten it securely. Pressurize the Lo side and apply a liquid leak test solution around the cover seal to make sure that pressure is not leaking
If a set point was specified for factory calibration, there may be no need to remove the pressurized electrical housing cover. Factory calibration can be verified on a test bench by connecting a continuity tester across the common (C) and normally open (NO) wire leads. Pressurize the Hi side pressure port and check actuation (deactuation) points on a calibrated reference gauge.
Units in Hazardous Locations: Prior to calibration, make sure that the work area is declassi 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.
Disconnect electrical power before removing cover in hazardous area! Avoid movement of the electrical switching element or its bracket. It has been precisely positioned for optimum performance at the factory. Even slight movement will affect performance; excessive movement can render device inoperative.
If no set point was specified for factory calibration, or if the set point specification has changed:
Remove housing cover. Calibrate the device as a gauge pressure switch. Turn the set point adjusting nut clockwise to increase the set point, or counterclockwise to decrease the set point.
To verify Series 20 operation under system operating conditions, install the cover and tighten it securely. Connect the HI and LO sides to suitable pressure sources and raise the pressures simultaneously to the expected system operating pressure. Apply a liquid leak test solution around the cover seal to make sure that Lo side pressure is not leaking. Vary Lo side pressure to verify actuation (deactuation) of the electrical switching element at the desired Differential Pressure Set Point.
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Form 536 (08.13) ©SOR Inc.
Dimensions
0
C
R
W
N
H
D F
A
N
Dimensions in these instructions are for reference only. They may be changed without notice. Contact the factory for Certified Drawings for a particular model number.
Weathertight — NEMA 4, 4X, IP65 Piston Number 22 Designator: RB, RH
103.4
4.07
25.1
0.99
PROCESS
CONNECTION
1/4 NPTF
100.0
3.94
*199.2
7.84
40.5
1.59
LOW
70.3
2.77
28.6
1.12
26.2
1.03
ELECTRICAL CONNECTION 3/4 NPTF
457.2
WITH
18.00 LENGTH WIRES 1/2 NPTF OPTIONAL
36.5
1.44
103.7
4.08
69.9
2.75
MIN
H
CO
CLEARANCE SLOTS
6.4
FOR
HARDWARE WITH
0.25
63.5 MIN TO
2.50
MOUNTING CENTERS
HIGH PROCESS
CONNECTION SIZE
1/4 NPTF 1/2 NPTF
1 NPTF
2 NPTF
76.2
3.00
MAX
* LENGTH
SHOWN
5.6
0.22
25.4
1.00
*58.7
2.31
PROCESS CONNECTION HIGH
94.5
3.72
7.1
0.28
ISO-9
PRODUCT
ALL DIM
UNLESS
THIS D
NO USE
HEREON,
MADE WIT
TITLE
DIMENSION SERIES 20 DI
EO NUMBER:
SCALE: 0.88
DO NOT SC
Linear = mm/inches
Drawing 0090446
Form 536 (08.13) ©SOR Inc.
5/8
Conventional Explosion Proof Piston Number 22
8
T
H
E
N S R
W E
4
Designator: TA
70.6
2.78
Linear = mm/inches
Drawing 0090118
195.6
7.70
PROCESS CONNECTION LOW 1/4 NPTF
39.1
1.54
78.5
3.09 TYP
1
1/4 OR 1/2 NPTM PROCESS CONNECTION OPTIONAL
7.9
2X
0.31 MOUNTING HOLES
88.9
3.50
22.2
0.88
97.6
1
3.84
25.0
0.98
9.8
0.39 TYP
1
1
*216.6
*119.1
4.69
8.53
A
PROCESS
CONNECTION
HIGH
HIGH PROCESS
CONN SIZE
SEE DETAIL
1/4 NPTF 1/2 NPTF
1 NPTF
2 NPTF
ELECTRICAL CONNECTION 3/4 NPTF WITH
457.2 MIN
18.00
LENGTH WIRES
ISO-9001
PRODUCT CER
ALL DIMENSI
UNLESS OT
THIS DRAWI
NO USE WHAT
HEREON, NOR
MADE WITHOUT
TITLE
DIMENSION DRA SERIES 20 DIFFER
EO NUMBER: 44
* LENGTH
SCALE: 0.75
SHOWN
5.6
ADD
0.22
25.4
ADD
1.00
146
LIN
LENGTH A
1/4 NPTM
SHOWN
1/2 NPTM
DIMENSION APPROXIMATE
AND BASED ON A FIVE
1
THREAD ENGAGEMENT
29.7
1.17
38.9
1.53
6/8
Form 536 (08.13) ©SOR Inc.
Weathertight — NEMA 4, 4X, IP65 Piston Number 24 Designator: RB, RH
103.4
4.07
25.1
0.99
CLEARANCE SLOTS
6.4
FOR
HARDWARE WITH
0.25
63.5 MIN TO
2.50
MOUNTING CENTERS
76.2
3.00
MAX
PROCESS
CONNECTION
1/4 NPTF
LOW
99.9
3.94
*197.8
7.79
40.5
1.59
*57.4
2.26
70.3
2.77
28.6
1.12
26.2
1.03
ELECTRICAL CONNECTION 3/4 NPTF
457.2
WITH
18.00
LENGTH WIRES
7.1
0.28
MIN
36.5
1.44
103.7
4.08
69.9
2.75
PROCESS CONNECTION
HIGH
Linear = mm/inches
Drawing 0091359
Form 536 (08.13) ©SOR Inc.
7/8
C E
R W N H
F
Conventional Explosion Proof Piston Number 24 Designator: TA
70.6
2.78
195.6
7.70
PROCESS CONNECTION LOW 1/4 NPTF
39.1
1.54
78.5 TYP
3.09
7.9
2X
0.31 MOUNTING HOLES
1/4 OR 1/2 NPTM PROCESS CONNECTION OPTIONAL
88.9
3.50
22.2
0.88
97.6
1
3.84
1
*215.3
8.48
*117.7
4.63
A
PROCESS CONNECTION
HIGH
DIMENSION APPROXIMATE
1
5.2
0.20
9.8
0.39 TYP
ELECTRICAL CONNECTION 3/4 NPTF WITH
457.2 MIN
18.00
LENGTH WIRES
PRODUCT
TITLE
DIM DWG 24 SERIES 20 DI
EO NUMBER:
AND BASED ON A FIVE
THREAD ENGAGEMENT
SCALE: 0.75
ISO-90
ALL DIM
UNLESS
THIS D
NO USE
HEREON,
MADE WIT
1
Linear = mm/inches
Drawing 0090176
Printed in USA sorinc.com
14685 West 105th Street, Lenexa, KS 66215  913-888-2630  800-676-6794 USA  Fax 913-888-0767
8/8
Registered Quality System to ISO 9001
Form 536 (08.13) ©SOR Inc.
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