TopWorx GO Switch for Nuclear Applications IOM Manuals & Guides

IOM

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TopWorx™ engineers are happy to provide technical assistance on GOTM Switch products. However, it is the

customer's responsibility to determine the safety and suitability of the product in their application. It is also the

customer's responsibility to install the switch using the current electrical codes in their region.

TM

C7, C8, H7, H8,

M7,M8, R7, SV7

Introduction

GO™ Safety Related
Switches operate on the
principle of magnetic
attraction, reacting to
magnetic targets as they
come within the switch's
sensing range. Although
switches vary in design
according to their intended
applications, all GO
Switches use permanent
magnets which, when
actuated by the presence
of a magnetic target,
change the state of
electrical contacts.

Mounting

■ Nuclear service GO
Switches are immune
to EMC and RF
interference.

■ Use non-ferrous,
stainless steel mounting
brackets only. Consult
factory for available
mounting kits. For
the maximum rated
sensing distance, avoid
mounting near ferrous
metals or in a ferrous
metal bracket.

Caution: Do not use
excessive force on external
threads when installing.
The switch threads need
to be properly torqued
as indicated below when

mounted to any xture.

Over-torquing or under­torquing the switch threads
may cause the switch
to operate improperly.
TopWorx recommends
a torque value of 35 lbs

- ft. (47.45 Nm) with a
tolerance of + /- 2 lbs.- ft.
(2.71 Nm).

■ The switch must be
mounted on the bracket
and bolted close to
the end of its threads,
near its center of mass.
This eliminates undue
stress caused by heavy
cables, connectors, etc.

H7, M7, & SV7

Specications - SPDT

Coaxial Sensing Distance w/ C-AMS7A Target

Average Sensing 0.190” ± 0.040” (4.83 mm ± 1.02 mm)
Average Reset 0.023” ± 0.010” (0.58 mm ± 0.25 mm)

Coaxial Sensing Distance w/C-AMS12 Target

Average Sensing 0.350” ± 0.025” (8.89 mm ± 0.64 mm)
Average Reset 0.031” ± 0.015” (0.79 mm ± 0.38 mm)

Pressure Rating At Sensing Surface: 2,000 psi (137.89 bar)

Thread Options: 5/8”-18 UNF (Consult TopWorx for metric thread

options)

Operating Temperature:

Qualied Life

(Years)

5 76 °C 85 °C

10 69 °C 78 °C

20 63 °C 71.5 °C

40 57 °C 65 °C

60 52.5 °C 61.5 °C

ATEX (all except SV7): -40°C (-40°F) to 150°C (302°F)

*The switch service (qualied) life depends on its operating temperature.

Contact Material: Palladium silver with Sawtooth surface conguration

Contacts: Single Pole, Double Throw, Form C.

H7 & M7 SWITCHES SV7 SWITCHES

Max. Normal Op. Temp.*

C7 & R7
Specications - SPDT

Coaxial Sensing Distance w/ C-AMS7A Target

Average Sensing 0.100” ± 0.020” (2.54 mm ± 0.51 mm)
Average Reset 0.023” ± 0.010” (0.58 mm ± 0.25 mm)

Coaxial Sensing Distance w/C-AMS12 Target

Average Sensing 0.250” ± 0.025” (6.35 mm ± 0.64 mm)
Average Reset 0.031” ± 0.015” (0.79 mm ± 0.38 mm)

Pressure Rating At Sensing Surface: 2,000 psi (137.89 bar)

Thread Options: 5/8”-18 UNF (Consult TopWorx for metric thread

options)

Operating Temperature:

C7 & R7 SWITCHES

Qualied Life (Years) Max. Normal Op. Temp.*

5 76 °C
10 69 °C
20 63 °C
40 57 °C
60 52.5 °C

ATEX: -40°C (-40°F) to 150°C (302°F)

*The switch service (qualied) life depends on its operating temperature.

Contact Material: Palladium silver with Sawtooth surface conguration

Contacts: Single Pole, Double Throw, Form C.

C8, H8, & M8

Specications - DPDT

Coaxial Sensing Distance w/ C-AMS7A Target

Average Sensing 0.100” ± 0.020” (2.54 mm ± 0.51mm)
Average Reset 0.023” ± 0.010” (0.58 mm ± 0.25mm)

Coaxial Sensing Distance w/C-AMS12 Target

Average Sensing 0.250” ± 0.025” (6.35 mm ± 0.64 mm)
Average Reset 0.031” ± 0.015” (0.79 mm ± 0.38 mm)

Pressure Rating At Sensing Surface: 2,000 psi (137.89 bar)

Thread Options: 1”-14 UNF (Consult TopWorx for metric thread options)

Operating Temperature:

C8, H8, & M8 SWITCHES

Qualied Life (Years) Max. Normal Op. Temp.*

5 76 °C
10 69 °C
20 63 °C
40 57 °C
60 52.5 °C

ATEX: -40°C (-40°F) to 150°C (302°F)

*The switch service (qualied) life depends on its operating temperature.

Contact Material: Palladium silver with Sawtooth surface conguration

Contacts: Double Pole Double Throw, 2 Form C.

■ C7, C8, H7, H8, M7,M8,
R7 and SV-7 nuclear
service GO Switches
must be installed with

TopWorx qualied target

magnets. Reference
sensing ranges in
corresponding sections
throughout the catalog.

■ Sensing and di󰀨erential
of switch may vary
depending on target
travel direction.

■ Congure mounting of
the switch and/or target
so that target passes
within the sensing
area without physically
contacting the switch.
Sensing range will vary
according to switch and
target mode.

■ For heavy or
inductive loads, arc
suppression devices,
or interposing relays
are recommended
for contact longevity.
Contact factory for

specics.

■ Installation must use
included Jam nuts and
Lock washers.

■ Recommended
installation distance
is equal to the half
of published sensing
distance per switch.

Electrical Ratings

Contact Ratings*

(Resistive)

Power (W) 0.5 - 480 0.2 - 72
Voltage (V) 100 - 250 24 - 137
Current (A) 0.004 - 5.0 0.004 - 3.0

ATEX (all except SV7): 4A @120VAC / 3A @ 24VDC

*Consult factory for higher Amp rating requirements

Target Material: Target magnets C-AMS7A or C-AMS12
Enclosure Material: SS type 303 or 316
Conduit Outlet: 1/2”-14 NPT. One location

AC DC

GO SWITCH HOOK-UP DIAGRAMS C7, R7, H7, M7, and SV7

SPDT (Form C) Contacts May be wired Form A (N/O) or B (N/C)

Electrical Ratings

Contact Ratings*

(Resistive)

Power (W) 0.5 - 480 0.2 - 72
Voltage (V) 100 - 250 24 - 137
Current (A) 0.004 - 5.0 0.004 - 3.0

ATEX: 4A @ 120VAC / 3A @ 24VDC

*Consult factory for higher Amp rating requirements

Target Material: Target magnets C-AMS7A or C-AMS12
Enclosure Material: SS type 303 or 316L (RCC-EK1+)
Conduit Outlet: 3/4”-14 NPT. One location

AC DC

C8, H8, and M8

DPDT (2 Form C) Contacts

Electrical Ratings:

Contact Ratings*

(Resistive)

Power (W) 0.5 - 480 0.2 - 72
Voltage (V) 100 - 250 24 - 137
Current (A) 0.004 - 5.0 0.004 - 3.0

ATEX: 3A @ 120VAC / 1A @ 24VDC

*Consult factory for higher Amp rating requirements

Target Material: Target magnets C-AMS7A or C-AMS12
Enclosure Materials: SS type 303
Conduit Outlet: 3/4”-14 NPT. One location

AC DC

Setting Up A Nuclear Service GO Switch For Optimum
Performance

Nuclear service GO Switches use permanent magnets and a push-pull
plunger to control a set of dry contacts. When a target magnet enters the
sensing area of the switch, it attracts the primary magnet, which pulls the
connecting rod and common contact. The normally closed and normally
open contacts change state.
(Continued on page 2.)

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IOM

*

*

C7 & R7 SPDT

4 COND. Peek Cable

N/C Red

N/O Blue

COM Black

GND Green

C8, H8, & M8 DPDT 7 COND.

Peek Cable & EGS Connector

N/C1 Red

N/O1 Blue

COM1 Black

N/C2 Yel low

N/O2 Brown

COM2 Natural

GND Green

EGS 4 Pin Connector

N/C A Red

N/O B White

COM C Black

GND D Green

C7 & R7 SPDT

4 COND. Peek Cable

N/C Red

N/O Blue

COM Black

GND Green

C8, H8, & M8 DPDT 7 COND.

Peek Cable & EGS Connector

N/C1 Red

N/O1 Blue

COM1 Black

N/C2 Yel low

N/O2 Brown

COM2 Natural

GND Green

EGS 4 Pin Connector

N/C A Red

N/O B White

COM C Black

GND D Green

TM

C7, C8, H7, H8,

M7,M8, R7, SV7

Attachment of Conduit or Cable Continued:

The sensing distance recommended by TopWorx is the maximum distance between
the switch and target magnet trip point. The average reset, also known as deadband
or hysteresis, is the distance that the target magnet must move from the sensing
area in order to allow the switch to reset.

To apply the Nuclear service GO Switch and obtain the least di󰀨erential, the direction

the target approaches the switch must be considered (axial, radial).

The measurements shown are nominal depending on the size of target magnet used
in the application. Consult the coaxial sensing distance for each switch model listed
in this IOM.

With proper mounting, once the switch is set, the GO Switch will maintain calibration
for life. See illustration below for correct switch alignment.

C-AMS7A Target Magnet C-AMS12 Target Magnet

*

*

*Refer to switch specications for average sensing distance.

The target magnet threads need to be properly torqued when mounted to any xture.

The target magnets were mounted at a torque value of 35 lbs-ft (47.45 Nm) with a
tolerance of + /- 2 lbs.-ft. (2.71 Nm) during seismic testing.

0518

II 2 GD

Ex d IIC T3 Gb; Ex tb IIIC T200 °C Db (Tamb - 40 °C to + 150 °C)
Baseefa08ATEX0360X
IECEx BAS 08.0122X
120VAC/4A AND 24VDC/3A FOR SPDT SWITCHES
120VAC/3A AND 24VDC/1A FOR DPDT SWITCHES

PLEASE NOTE: THE SV7 SWITCH IS NOT CERTIFIED BY ATEX OR IECEx.

Attachment of Conduit or Cable

Attach conduit or cable correctly.

The switch conduit or cable needs to be properly supported when mounted to any

xture. During seismic testing, the stainless steel conduit (with PEEK cable) was

supported at 3.28 ft (1 m) from the back of the switch while the Rockbestos or PEEK
cables were supported at 1 ft (0.305 m) away from the back of the switch. EGS Flex
conduit and support kit are available from TopWorx as an option. During seismic

testing of the C7 switch with EGS QDC and ex conduit, the ex conduit was

supported 15”- 48” from the QDC interface. Please consult factory for more detailed
information.

– If the switch is mounted on a moving part, be sure exible conduit is long enough

to allow for movement, and positioned to eliminate binding or pulling.

– For installation in hazardous locations, check local electrical codes.

– All conduit connected switches should be installed using proper installation

methods.

– The GO Switch must have a qualied QDC, a qualied sealed stainless steel

conduit, or other types of qualied accepted seal when used in submerged

applications or exposed to 100% humidity. For LOCA DBA type submergence,

however, only the C7 switch has been qualied for this application.

– Per Qualtech Report No. TR-23009-14 Rev A, the EGS O-ring qualied life at

continuous operation, without disconnection, is 25.1 years at 144.14 of (62.3
°C). If for any reason these assemblies need to be detached prior to installation
or while in operation, the O-rings must then be replaced. The maximum shelf
life that can be assigned for the O-Ring is 10 years from the cure date. As long
as the O-Rings have been stored per the guidelines of ANSI N45.2.2, Level B
(now ASME NQA-1, Part II, Subpart 2.2, Level B), the O-Ring may be placed into
installed service any time prior to the shelf life expiration date without impinging

on the qualied life outlined above

All GO Switches are “pure” contact switches, meaning they have negligible
voltage drop when closed, nor do they have any leakage current when open.
For multi-unit installation, switches may be wired in series or parallel, as
shown to the right.

Series Wiring

Any number of GO Switches may be
wired in series, without voltage drop.

Parallel Wiring

Any number of GOTM Switches may be
wired in parallel, with no current leakage
and without drawing operating current.

Special Conditions for Safe Use

The eld side wires should be protected against damage and terminated to a

terminal or junction box suitable for the conditions of use.

Due to the GO Switch’s sealed construction, eld service is not available. Refer to

our trouble shooting guide for a possible solution. If problem persists, please contact
the factory directly.

EU Declaration of Conformity

The products described herein, conform to the provisions of the following European
Community Directives, including the latest amendments:

Low Voltage Directive (2006/95/EC)
EMC Directive (2004/108/EC)
ATEX Directive (2014/34/EU)

C7 & R7 SPDT

4 COND. Peek Cable

N/C Red

N/O Blue

COM Black

GND Green

Visit www.topworx.com for
comprehensive information
on our company, capabilities,
and products– including
model numbers, data sheets

specications, dimensions, and
certications.

[e-mail]

www.topworx.com

The Emerson logo is a trademark and service mark of Emerson Electric Co. ©2016 Emerson Electric Co. ©2016
TopWorx, All rights reserved. TopWorx™ and GO™ Switch are all trademarks of TopWorx. All other marks are the

property of their respective owners. Information herein – including product specications – is subject to change without

notice.

C8, H8, & M8 DPDT 7 COND.

Peek Cable & EGS Connector

N/C1 Red

N/O1 Blue

COM1 Black

N/C2 Yel low

N/O2 Brown

COM2 Natural

GND Green

GLOBAL SUPPORT OFFICES

Americas

3300 Fern Valley Road
Louisville, Kentucky 40213
USA
[phone]

Asia-Pacic

1 Pandan Crescent
Singapore 128461
[phone]

Europe
Horseld Way
Bredbury Industrial Estate
Stockport SK6 2SU
United Kingdom
[phone]

EGS 4 Pin Connector

N/C A Red

N/O B White

COM C Black

GND D Green

Middle East

P.O. Box 17033
Jebel Ali Free Zone
Dubai 17033
United Arab Emirates
971 4 811 8283

Africa
24 Angus Crescent
Longmeadow Business Estate East
Gauteng, South Africa
[phone]

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