What is an instrument?
For many years, Tahlilgar Moj Khazar has started its activity in the field of selling precision instrument equipment with well-known and modern brands in the world, which, with its technical knowledge and numerous experiences, has become the largest and most prominent supplier of precision instrument equipment in this industry and is always the best It provides products from the most famous domestic and foreign brands according to the consumption needs in Iran.
Tahlilgar Moj Khazar provides a variety of instrumentation equipment including level measurement equipment, pressure measurement equipment, temperature measurement equipment, flow measurement equipment, calibration equipment, fluid analyzer equipment, portable measurement equipment for physical, chemical, electrical parameters and Electronics, etc. are in all kinds of brands.
Instrumentation of an infrastructure for control and automation system includes instruments such as flowmeter, flow controller, pressure controller, pump, gas detector, generator, laboratory reactor, etc. With the help of this tool, it is possible to accurately measure, transmit, display, record and control important physical parameters such as temperature, pressure, flow, liquid level, etc. in industrial processes.
Precision tools can be classified in two ways, one according to the type of function of this tool; For example, tools that are responsible for controlling temperature, pressure, humidity, or level are known as controllers, and similarly, tools for displaying these values are known as indicators or displays, and tools for transmitting value information in the form of standard signals that are transmitters. called.
Instrumentation can also be classified in terms of parameters that this instrument should perform an operation on. For example, parts of instruments related to temperature such as temperature controller, temperature transmitter and thermometer or temperature display, pressure measurement and accurate control tool, flowmeter or fluid flow measurement and transfer of flow values or flow control, level measurement tool or material level measurement Inside the tanks and their precise control and speed measurement tools, hygrometer tools, etc.
All kinds of instrumentation equipment
1. Sensor
Any device capable of measuring and converting physical quantities into electrical quantities is called a sensor. The task of a temperature sensor is to measure the temperature and convert it into an electrical signal.
2. Transmitter
Transmitters are generally referred to as equipment that perform measurement (sensor), conversion and amplification of signals in one set. Transmitters are equipment that are widely used in large industrial processes because the distance between the transmitters and the control rooms is very high, and only the use of the transmitter seems reasonable in this situation.
3. Transducer
Transducers are actually converters of sensor output signals to standard signals, for example, using a thermocouple with millivolt outputs in the industry was completely wrong, so in these cases, you can use a thermocouple converter to 0-10V signal. . Transducers are a converter in general.
4. Display
To display the value of measured parameters of precision instruments, displays whose inputs are standard should be used. For example, to display the pressure value of a sensor or the temperature value measured by the sensor, displays that support the same sensor or standard inputs such as 0-10 V, 4-20 mA should be used.
5. Controller
The next step is control measurement, suppose you want to control the temperature of a water tank in a process, the elements and equipment you need for this work are as follows: controller, temperature transmitter and valve control that the amount of energy Control the heating, which can be the heat of the fire, which the control valve is responsible for controlling the incoming gas, or the supplying energy can be the heat of the steam, which controls the flow rate of the steam.
6. The final element
As the name suggests, the last step of each process is performed by the final element (of course, if it is a control process), which is different in different processes of this final element. Maybe in one process the final element is a control valve, in another process it is an electric motor, in another process it is pneumatic and hydraulic jacks, etc. Operators are actually the final element.
Components of precision instruments
Gauges
The measurement section measures the actual value of the desired element. Various parameters are measured in industries for control.
The most important parameters that are measured in the industry for control:
Measurement of the pressure
Measurement of the temperature
Measurement of fluid flow
Measurement of the height of liquids (Measurement of the level)
Controllers
At the beginning of the industry, when the control was not as it is today, the control was done by human factors, then with the advancement of the science of automatic control system, it entered a new stage with the creation of pneumatic tools. After some time, with the invention of the transistor, the use of electronic cards for control began, with the creation of these control parts, the use of human factors for control was reduced. In the continuation of the progress of science, industrial computers entered the industry under the name of plc. By these plcs, the units were easily controlled and changes were made easily in the units.
Today, newer controllers called Distributed Controller System (DCS) and Fuzzy Controllers (FCDD) are responsible for control in industrial units.
actuators (output devices)
Stimulators are devices that send signals
It takes a signal from the controller and acts according to these signals. Control valves and electric motors can be mentioned among the main output devices. These tools, with their function, control the measured parameters in the desired value. These tools have a wide variety.
Measurement features
Range of measurement
zero measurement (Zero)
Zero Drift
Sensitivity
Resolution
Response
Linearity
Hysteresis
Accuracy
Repeatability
