Instrumentation

Pressure Transmitter connections

In this lesson, we will discuss the connections of a pressure transmitter. Till now we have discussed pressure transmitter and pin type transmitter.

 pressure transmitter (PT) Connections 

Now we will discuss the connections of a PT.

3 connection terminals are given in a PT.
+ive.
-ive.
Check.
Transmitter power supply is 24V DC. Since 2- wire connection method is used for the connection of a PT.
in 2- wire connection method same ports are used for supply and output signal of a pressure transmitter. So connections are made in series.
Since only 2 wires are used for both power supply and output signal . This method is known as 2- wire connection method.

Another method of connecting is 4- wire method. 4 wire method will be discussed later in other lessons.

Pressure Transmitter Connections
Pressure Transmitter Connections

In the above figure, a pressure transmitter connection method is shown.

As shown in the figure
+ ive of 24 V DC is Connected to + ive of PT and this 24 V DC supply is used to ON the transmitter.
If + ive of 24 V DC is not connected to + ive of the transmitter, the transmitter will not be ON.
So if Transmitter is ON that means 24 V DC Supply is in the PT.
– ive of PT is connected to the + ive of the process indicator or PLC.
– ive of process indicator is connected to – ive of 24 V DC power supply.

Above Connection Method is known as Series Connection Method

So far we have discussed Connections of a PT.

In the next lesson, we will discuss the wiring method used in industries, which means how the wiring is done from PLC/DCS to the pressure transmitter.  This will help to find the faults during running or shut down plants.

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