Download Smart transmitters

Smart transmitters
Features of smart transmitter
• Has a memory
• Can perform calculations; perform self-diagnostics; reports
faults; and can be communicated with from a remote location.
• The sensor signal transmitter into a unified standard signal:
0/4-20mADC, 1-5VDC, 0-10VDc
• Many different types of transmitters.
• In addition to the functions are sensing there is amplification
shaping function, the output control signals to a standard such
as :4-20mA
Characteristics of smart transmitter
• With automatic compensation capability through
software for sensor non-linearity, drift, drift, etc
• Data processing to facilitate accurate and automatic
processing of data according to internal procedures,
such as statistical processing to remove the abnormal
values,
• Two-way communication. Microcontroller can not only
receive and process sensor data, can also be feedback to
the sensors,
• Can store the characteristics of the sensor data,
configuration information, and compensation
characteristics
• with a digital interface to output can be easily output
the digital signal and the computer or field bus
connection.
• The smart transmitter performs not only as the
instrument system but also as the signal processing
system
• The user can obtain the useful data processed from
the measured data in field by using the programmable
smart transmitter.
• Calibration information for RTD and other sensors
are stored in the digital memory of the smart
transmitter.
• The smart transmitter can find the sensor and
reservoir failure with embedded failure detection
algorithm and can change the operation range by
communication between the transmitter and the
control room.
• The smart transmitter can also eliminate the effect
due to ambient temperature by measuring it for this
purpose.
Two-Wire Transmitter
• Two-wire transmitter designed for temperature
and bridge sensors.
• Zero, span, and linearization errors in the analog
signal path can be calibrated via a standard digital
serial interface, eliminating manual trimming.
• Non-volatile external EEPROM stores calibration
settings.
• The all-analog signal path contains an input
multiplexer, auto zeroed programmable-gain
instrumentation amplifier, dual programmable
current sources, linearization circuit, voltage
reference, sub-regulator, internal oscillator,
control logic, and an output current amplifier.
• Automatic reset is initiated when supply is
lost.
• Current sources, steered through the
multiplexer, can be used to directly excite RTD
temperature sensors, pressure bridges, or
other transducers.
• op amp can be used to convert current into a
voltage.
• The XTR108 is specified for –40°C to +85°C.
Some distinct advantages of using
Smart transmitter.
• Ease of installation and communication, selfdiagnosis, improved and digital reliability.
• Smart transmitters are also less subject to
effects of temperature and humidity than
analog devices.
• Smart transmitters also provide increased
accuracy. And because can replace several
different types of devices, using them allows
for inventory reduction.
Block diagram of an intelligent industrial pressure
transmitter