Skip to main content

What is a SMART Transmitter?

 The SMART transmitter stands for Single Modular Auto-ranging Remote Transducer.

It is an intelligent transmitter that has an analog output and simultaneously provides digital communication signal based on HART protocol or FOUNDATION FIELDBUS or PROFIBUS.

Table of contents

SMART Transmitter

Advantages of SMART Transmitters

Disadvantages of SMART Transmitters

In general, the simplified smart transmitter diagram shown in the below figure. It consists of a sensor or input circuitry, the microprocessor, memory, and a communication block.


The word multi-variable transmitter is also used sometimes particularly for a device like a smart flow measuring instrument.


This measures absolute pressure, differential pressure, and process temperature. Computes mass flow rate and volumetric flow rate of the process fluid.


SMART Transmitter


The output from the smart transmitter no longer just the primary process variable, but also includes secondary process variables, sensor health, sensor performance characteristics, calibration information, and real-time diagnostics. (These data can be accessed through HART protocol or via fieldbus communication)

All this information is used to improve the process, optimize the performance of the instrument while extending its life, and maximize the productivity of the personnel.

With the advent of the internet, high data speed, and with these smart field instruments and systems are further transformed and become part of IoT (Internet of Things).

Advantages of SMART Transmitters
Here below are a few points describe Smart Transmitters:


  • Smart transmitters consist of microprocessors and have bi-directional communication.
  • Smart transmitters include secondary sensors, that can measure and compensate for environmental disturbance.
  • Signal conditioning will be done and also analog to digital conversion.
  • Smart Transmitters consists of multiple sensors and covering various measurement ranges and allow automatic selection of the required range.
  • Smart transmitters have a self-calibration capability that allows the removal of zero drift and sensitivity drift errors.
  • Smart transmitters will have a self-diagnostic capability and one can plan for maintenance requirements.
  • It can adjust for non-linearities and give linear output.
  • Smart transmitters provide improved accuracy and reliability.
  • Long term stability can be improved, re-calibration frequency can be reduced.
  • Reduced maintenance costs.
  • Allows interoperability and becomes possible for selecting vendors of choice.
  • Allows remote re-calibration and re-ranging.
  • Reduction in managing a number of spare transmitters, since one transmitter can be configured to cover any range and makes it possible to replace the transmitters.
  • Some transmitters like temperature measurement have the facility to connect redundant sensors, which is not possible with ordinary transmitters. In the event of failure of one sensor, the other sensor helps to find the temperature which improves the plant reliability.
  • Configuration data that was stored under the same Tag can be transferred from handheld communicators or from DCS systems.
  • The majority of smart transmitters are loop powered (two-wire).
Disadvantages of SMART Transmitters
  • As a part of preventive maintenance, calibration or validation can not be avoided, though the transmitters are SMART.
Labels:

Comments

Post a Comment

Popular posts from this blog

PLC Program for Mixing Tank

 Create a ladder diagram for controlling a batch mixing process. Implement a PLC program for mixing tank or Mixing Process using PLC Ladder Logic. PLC Program for Mixing Tank Fig : Mixing tank A tank is used to mix two liquids. The required control circuit operates as follows: A. When the START button is pressed, solenoids A and B energize. This permits the two liquids to begin filling the tank. B. When the tank is filled, the float switch trips. This de-energizes solenoids A and B and starts the motor used to mix the liquids together. C. The motor is permitted to run for 1 minute. After 1 minute has elapsed, the motor turns off and solenoid C energizes to drain the tank. D. When the tank is empty, the float switch de- energizes solenoid C. E. A STOP button can be used to stop the process at any point. F. If the motor becomes overloaded, the action of the entire circuit will stop. G. Once the circuit has been energized, it will continue to operate until it is manually stopped. Solution...
1 comment
Read more

What is Relay? How it Works? Types, Applications, Testing

 We use relays for a wide range of applications such as home automation, cars and bikes (automobiles), industrial applications, DIY Projects, test and measurement equipment, and many more. But what is Relay? How a Relay Works? What are the Applications of Relays? Let us explore more about relays in this guide. What is a Relay? A Relay is a simple electromechanical switch. While we use normal switches to close or open a circuit manually, a Relay is also a switch that connects or disconnects two circuits. But instead of a manual operation, a relay uses an electrical signal to control an electromagnet, which in turn connects or disconnects another circuit. Relays can be of different types like electromechanical, solid state. Electromechanical relays are frequently used. Let us see the internal parts of this relay before knowing about it working. Although many different types of relay were present, their working is same. Every electromechanical relay consists of an consists of an Elect...
1 comment
Read more

Chlorine dioxide Analyzer Principle

 Chlorine dioxide measurement Chlorine dioxide (ClO2) is an instable, non-storable, toxic gas with a characteristic scent. The molecule consists of one chlorine atom and two oxygen atoms – represented in the chemical formula ClO2. It is very reactive. To avoid the risk of spontaneous explosions of gaseous chlorine dioxide or concentrated solutions, it is generally handled in dilution with low concentrations. ClO2 is soluble in water, but tends to evaporate quickly. Typically it is prepared on site, for example from hydrochloric acid and sodium chlorite. The procedure provides solutions with approx. 2 g/l ClO2 that can be safely handled and stored for several days. Image Credits : krohne Sensor Parts : Reference electrode Applied chlorine dioxide specific potential Current needed to maintain the constant potential Counter electrode Measuring electrode The disinfection effect of ClO2 is due to the transfer of oxygen instead of chlorine, so that no chlorinated byproducts are formed. C...
6 comments
Read more