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.
www.Fisher.com
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-
2
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