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Instruction Manual
D104234X012
GH04148 Proximity Switch
October 2019
GH04148 Proximity Switch
Safety instructions
Please read these safety warnings, cautions, and instructions carefully before using the product. These instructions
cannot cover every installation and situation. Do not install, operate, or maintain this product without being fully
trained and qualified in valve, actuator and accessory installation, operation and maintenance. To avoid personal injury
or property damage it is important to carefully read, understand, and follow all of the contents of instruction manual
including all safety cautions and warnings. If you have any questions about these instructions, contact your Emerson
sales office before proceeding.
Special Instructions for Safe Use and Installations in Hazardous Locations
Certain nameplates may carry more than one approval, and each approval may have unique installation requirements
and/or conditions of safe use. Special instructions are listed by agency/approval. To get these instructions, contact
your Emerson sales office. Read and understand these special conditions of use before installing.
WARNING
Failure to follow conditions of safe use could result in personal injury or property damage from fire or explosion, or area
re-classification.
Description
This proximity switch provides a set of solid-state relays for controlling external circuits. The relays are driven between
open and closed states by sensing the position of a magnetic plunger.
To determine that the switching device is working correctly, the external circuits and controlled processes must be
monitored by independent measurements. The safety of any system incorporating the equipment is the responsibility
of the assembler of the system.
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GH04148 Proximity Switch
October 2019
Table 1. Specifications
Instruction Manual
D104234X012
Equipment Ratings
Operating Ambient Temperature Range: -40°C to
85°C (-40 to 185°F)
Maximum Altitude: 2000 m (6562 feet)
Contact Electrical Ratings
(1)
1 amp resistive, 0.5 amp inductive at 28 VDC
“Contacts” are not polarity sensitive
A bi-directional transient voltage suppressor (TVS)
rated at a clamping voltage of 59 V protects each
Solid State Switch from electrostatic discharge (ESD)
and inductive back-EMF. An additional such TVS is
installed across the NC to NO connections. The TVS
has a reverse standoff voltage of 33 V, so
misapplication of the switch in a circuit with voltage
above the 28 VDC rating could result in conduction
across an “open” set of switch leads.
Switch behavior during inadequate supply power
conditions for the electronic: both switches in the
open state
Process Seal
Single Seal
Internal O-ring material: see Construction Materials
Maximum seal pressure: 6.9 bar (100 psi)
Seal temperature range: -40 to 204°C (-40 to 400°F)
The switch is not exposed to process fluids during
normal operation.
Electrical Connections
Electrical 1/2-14 NPT external conduit connection
with 0.5 m (greater than 18 inches) of 18 AWG lead
wires. Install conduit seal within 18 inches.
Safety ground wire is 16 AWG
Wire Color Circuit Description
White/Red DC Supply +
White/Black DC Supply –
Red Normally Closed Contact
Brown Common Contact
Blue Normally Open Contact
Green Ground (Housing, Safety)
Insulation Requirements: Should be consistent with
switched equipment rating and power supply rating,
as well as local code wiring requirements.
See block diagram in figure 1
Power Requirements for Electronics
Excitation Voltage Range for Electronics: 9 - 30 VDC
Maximum Input Voltage Ripple: 400 mV
Current Draw
Steady state: Less than 15 mA
Transient (startup or switching): Less than 500 mA
peak
Maximum quiescent steady state power draw
of electronics during normal operation within
design parameters:
Pmax_quiescent: 450 mW
Maximum transient power draw of electronics
during normal operation within design parameters:
Pmax_transient: 15 W
The supply terminals are protected against reverse
polarity.
With excessive voltage present on the supply
terminals, a protective bi-directional TVS will
conduct.
The guaranteed standoff voltage of the TVS is 26 V.
Breakdown occurs between 21.9 and 31.9 V.
Clamping Voltage is 42.1 V.
Peak Pulse Power rating is 5000 W.
A common-mode choke protects against conducted
EMI.
Construction Materials
Switch body & cover: Aluminum 6061 T6, chromate
conversion coated
Internal O-ring: Fluorosilicone rubber
-continued-
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Instruction Manual
D104234X012
Table 1. Specifications (continued)
GH04148 Proximity Switch
October 2019
Hazardous Area Classifications Available
cCSAus
Explosion-proof Class I Division 1, Groups ABCD
Dust Ignition-proof Class II Division 1 2, Groups EFG
Single Seal
ATEX II 2 GD
Flameproof Ex d IIC T5(Ta ≤ @85°C) / T6 (Ta≤ @ 78°C)
Dust Ex tb IIIC T92°C / T85°C Db IP6X
1 A Max
IECEx
Flameproof Ex d IIC T6 T5 (Ta ≤ @85°C) /
T6 (Ta≤ @ 78°C)
Dust Ex tb IIIC T T92°C / T85C Db IP6X
1 A Max
Ingress Protection Rating per IEC 60529: IP66
1. Contacts are solid state switches.
Symbols used
Symbol Description
Special Conditions of Safe Use
1. 1/2-14 NPT conduit connection which is integral to
the body of the switch to be sealed within 18
inches.
2. Flame proof joints are not intended to be repaired.
3. Keep cover tight while circuits are alive.
4. Garder le couvercle bien fermé tant que les circuits
sont sous tension.
Direct Current
Protective Earth Ground
Caution: indicates that the manual
has more information
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GH04148 Proximity Switch
October 2019
Block Diagram
Figure 1. Block Diagram
Instruction Manual
D104234X012
(EXTERNAL)MAGNET
SENSOR
+ SUPPLY
- SUPPLY
HOUSING
GROUND
NOTES
1. COMPONENTS NOT SHOWN: TRANSIENT VOLTAGE SUPPRESSORS ACROSS LINES.
2. THE NO/NC DESIGNATIONS ARE VALID WHEN ELECTRONICS ARE POWERED. OTHERWISE BOTH CONTACTS ARE OPEN.
COM
NC
NO
Maintenance
The GH04148 Switch is not intended to be serviced.
WARNING
De-energize prior to instrument maintenance or replacement of parts.
Neither Emerson, Emerson Automation Solutions, nor any of their affiliated entities assumes responsibility for the selection, use or maintenance
of any product. Responsibility for proper selection, use, and maintenance of any product remains solely with the purchaser and end user.
Fisher is a mark owned by one of the companies in the Emerson Automation Solutions business unit of Emerson Electric Co. Emerson Automation Solutions,
Emerson, and the Emerson logo are trademarks and service marks of Emerson Electric Co. All other marks are the property of their respective owners.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not
to be construed as warranties or guarantees, express or implied, regarding the products or services described herein or their use or applicability. All sales are
governed by our terms and conditions, which are available upon request. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Automation Solutions
Marshalltown, Iowa 50158 USA
Sorocaba, 18087 Brazil
Cernay, 68700 France
Dubai, United Arab Emirates
Singapore 128461 Singapore
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E 2019 Fisher Controls International LLC. All rights reserved.
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