How a 4-20mA Transmitter Works|4-20mA Transmitter Working|In Hindi|

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The PLC / DCS Analog Input card transmits a standard +24 V DC, 20 mA signal to Power the Transmitter.

A one pair cable is used to power the transmitter and the same cable is used to receive the data in the 4-20mA current range.

Transmitter receives +24V DC, more than 20mA signal in the loop. A minimum +5V DC, 20mA signal is required to proper functioning of transmitter. In Practical there will be a voltage drop in the loop.

Transmitter have an inbuilt voltage regulator function which is used to regulate the loop current. The Transmitter will be configured with LRV, URV and other details of Process variable. The loop current will be varied / changed by the transmitter as per the measured Process variable.

The 4-20mA current will be converted into standard 1 – 5 V DC using a precision 250 ohms resistor. The Analog to Digital converter will be used to convert the voltage into digital signal which is used to indicate the Process Variable value in the DCS / PLC HMI.

A Flow/pressure Transmitter with a range of 0 to 100 m3/hr or bar . Transmitter indicates 0 m3/hr or bar as there is no flow or pressure in the line. DCS / PLC powers the transmitter with +24V DC, 20mA. As Process Variable is 0 m3/hr or bar the transmitter regulates the loop current to 4mA and its equivalent voltage is 1 V DC which is measured by A/D Converter which indicates 0% of Process Variable
same as for 50% & 100% of process variable.

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