Instrumentation

Pressure Transmitter

In this lesson, we will study the pressure transmitter (PT).

A PT measures pressure, typically of gases or liquids.

Pressure Transmitter is used to Transmit the Pressure of any process Line, Body, or tank to a process Indicator, PID Controller, PLC, or DCS.

A pressure Transmitter is a Transducer that converts Mechanical energy to Electrical Energy. it generates a signal as a function of the pressure imposed. The pressure transmitter is a transducer that converts pressure into an analog electrical signal.

pressure transmitter
        pressure transmitter

as we know transducer converts any signal into an electrical signal.

Input:     Pressure From any Process Line, body, or tank.

        Output:  4-20 m amp.

        Supply:   24 V DC.

Since a 4-20mA signal is least affected by electrical noise and resistance in the signal wires, these transducers are best used when the signal must be transmitted long distances. It is not uncommon to use these transducers in applications where the lead wire must be 1000 feet or more.

Internal Parts of a PT

  • Diaphragm– Pressure is imposed on a diaphragm
  • Capacitive Plates.
  • Silicon Oil.

Outer Parts of PT

  • Outer body – Outer body is Used to protect the transmitter
  • Indicator– Indicator is Used to indicate the pressure of a line, body, or tank.
  • Connection Terminals- connection terminals are used to connect the pressure transmitter to PLC/DCS, indicator, or PID Controller.
  • Zero and Span Screw or button– Zero and span buttons are used for calibration of pressure transmitters. zero button or screw is used to adjust 4 milliampere value and span button is used to  adjust 20 milliampere value
  • Process connector– Process connector is used to connect a pressure transmitter in a line, a body, a tank, etc. Simply we can say that process connector is used to connect a pressure transmitter to a process which pressure needs to measure.

In the next lesson, we will discuss more the PT.

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