What is Indicator & Transmitter ?
Before starting the indicator and transmitter subject, it is necessary to briefly mention the question of what is a transducer.
What İs Transducer ?
Transducers are basically primary element sensors that convert mechanical energy into an electrical signal, usually millivolts. Transducer usage areas are quite wide. From the technological devices we use, there are transducers within many products we use in our lives. It enables precise measurements to be made in industrial and industrial fields, control and control systems, medical electronics and factories. Transducer types have a wide range of uses as they work in partnership with sensors. There are different types of transducers according to the need for use in different areas and the project design. There are many transducer devices specially produced for areas of use.
Weight and Pressure Transducer
A weight and pressure transducer is a type of transducer that converts the change in physical structures into electrical energy. This transducer is divided into two as magnetic and crystalline. The magnetic model detects voltage changes with the pressures applied on them. The crystalline model shows resistance change under pressure.
The heat transducer is affected by the potential difference change due to the temperature of its environment. Thermostat, Thermocouple, Thermistor are examples of heat transducer types. Thermostat allows metals to elongate according to the degree of heat. Thermocouple is the electrical voltage created by two different metals. Thermistor is the resistance change that occurs with heat exchange.
A magnetic transducer is a device that produces an output voltage according to the magnetic change in its environment. This device consists of two different variations. These variations are inductive and semiconductor. Inductive is when the coil produces voltage between the terminals. Semiconductor is the collection of electrons in one place.
An optical transducer is a type of transducer that generates electrical energy according to the change in light intensity and resistance in its environment. It consists of two different models with names such as light emitting and light sensing. Both types have a photosensitive lens.
What is A Indicator & Transmitter ?
The concept of indicator is a term used in physics from French. In physics, it is also known as an indicator. It is the name given to the separator that shows the presence of a substance when it is tested in an environment.
Trasmitters are electronics that allow the millivolt signal output of transducers to be processed and converted into current for transmission over long distances.
To the question of what is an indicator in weight measurements, it is possible to briefly define it as a device that processes the data from the load cell and displays this data as weight information. To put it another way, systems that interpret and display the weight of objects on the platform in kg and other units in load cells are called in this way. It is also popularly referred to as a weighing indicator or weight indicator.
In load cells, the weight of objects on the surface is measured in accordance with the scheme known as the wheatstone bridge. However, in order for the weight to be understood, it must be displayed in kg or another weight unit.
This is exactly what an indicator integrated with the weighing system does. Weight measurements are displayed on a digital display. The data obtained is converted into values based on the unit used. Indicators are used not only for measurement but also for data collection and reporting.
Transmitters are electronics that allow the millivolt signal output of transducers to be processed and converted into current for transmission over long distances. Current is often preferred because it is virtually unaffected by radio frequency interference, unlike voltage, which is sensitive.
Transmitters are current output devices and can be two- or three-wire. By using two wires to both receive power and transmit an output signal, significant cost savings can be achieved where long cables are required. They are often scaled in the system to vary from 4 mA to 20 mA as the pressure changes from minimum to maximum.
Because the internal circuitry is “current driven”, it controls the transmitter voltage between the two terminals to ensure that the appropriate pressure proportional current is maintained regardless of line resistance up to a certain limit.
The transmitter is thus well suited for use with long cables and is much less affected by electromagnetic interference than voltage output transducers.
How Does It Work ?
Weighing systems basically consist of two different terminals. These terminals are the platform and the indicator. The load cells on the platform calculate the weights of the objects on the floor in accordance with the wheatstone bridge scheme and send the obtained data to the indicator. When transmitted to the indicator, these signals are converted and the transmitted data are converted into kg and other weight values and displayed by the weighing indicator.