GE Masoneilan SVI II ESD Installation And Maintenance Manual page 206

FSK
Hall Effect Sensor
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HART
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HART Communication
Foundation
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HART Filter
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HART Master
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HART Slave
Hazardous Area
Hot Swapable
I⁄P Converter
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=GE Oil & Gas
Frequency Shift Keying see HART
A semiconductor magnetic-field sensor that measures the magnetic
field perpendicular to the sensor.
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HART is an acronym for Highway Addressable Remote Transducer.
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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
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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.
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The HART Communication Foundation is an independent, nonprofit
corporation specifically organized to coordinate and support the
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application of HART technology 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
A filter required with certain DCS systems, not HART
allows the 4 - 20 mA output signal to pass from control system to
positioner, but blocks HART
wiring to the control system.
A device, usually a PC controlling communications over a HART
protocol network. The HART
mand and requires a response.
A device, normally a transmitter or positioner, that communicates
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over a HART protocol network only in response to a master device
command.
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.
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.
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.
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protocol.
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technology.
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FSK tones from passing from the field
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master sends to a field device a com-
© 2016 General Electric Company. All rights reserved.
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compliant. It
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