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© 2017 Baker Hughes, a GE company, LLC. All rights reserved.
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BHGE
FSK
Frequency Shift Keying see HART
®
protocol.
Hall Effect Sensor
A semiconductor magnetic-field sensor that measures the magnetic
field perpendicular to the sensor.
HART
®
HART
®
is an acronym for Highway Addressable Remote Transducer.
The HART
®
protocol makes use of the Bell 202 Frequency Shift Key-
ing (FSK) standard to superimpose digital signals at a low level on top
of the 4-20 mA. This enables two-way communication to take place
and makes it possible for additional information beyond just the nor-
mal process variable to be communicated to
⁄
from a smart field
instrument. HART
®
protocol communicates without interrupting the
4-20 mA signal and allows a host application (master) to get two or
more digital updates per second from a field device. As the digital
FSK signal is phase continuous, there is no interference with the 4-20
mA signal.
Field Comm
®
This foundation is an independent, nonprofit corporation specifically
organized to coordinate and support the application of HART
®
tech-
nology worldwide. Educating the industry on the capabilities and
value of this important technology is a key role.
Operating costs are offset by membership and training
⁄
support ser-
vice fees. Membership is open to all suppliers, end users, and others
interested in the use of HART
®
technology.
HART
®
Filter
A filter required with certain DCS systems, not HART
®
compliant. It
allows the 4 - 20 mA output signal to pass from control system to
positioner, but blocks HART
®
FSK tones from passing from the field
wiring to the control system.
HART
®
Master
A device, usually a PC controlling communications over a HART
®
protocol network. The HART
®
master sends to a field device a com-
mand and requires a response.
HART
®
Slave
A device, normally a transmitter or positioner, that communicates
over a HART
®
protocol network only in response to a master device
command.
Hazardous Area
The area of the plant where hazard is present, hazards such as
explosion due to propane gas in a refinery, or dust in a flour mill.
Hot Swapable
The SVI II ESD in combination with ValVue ESD enables a very brief
Mean Time To Repair by the following process: upload all configura-
tion information from installed positioner to ValVue ESD, then replace
the positioner and download the configuration file. Run STOPS, and
autoTUNE, and the repair is complete.
I
⁄
P Converter
The current to pressure converting device. SVI II ESD sends an analog
current signal to the I
⁄
P which produces a controlled pressure to the
pneumatic amplifying relay.
Summary of Contents for SVI II ESD
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