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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