Instrumentation

pressure transmitter signal checking


In this lesson, we will discuss the wiring used for a pressure transmitter in industries and how the signal is checked in a pressure transmitter.

First, we will discuss the wiring used for a pressure transmitter in industries.

"Wiring for pressure transmitter"
“Wiring for pressure transmitter”
  • Signal from PID controller or PLC/DCS is given to analog output junction box. This signal is analog output signal.
  • If the process is controlled through PLC/DCS then the analog output  signal comes from analog output card or module through analog output panel.
  • From analog output junction box signal is given to pressure transmitter.
  • From  transmitter signal is given to Analog input junction box.
  • From this analog input junction box feedback signal is provided to controller. This signal is known as analog signal.
  • If the process is controlled through PLC/DCS then the analog input signal is provided to analog input card or module through analog input panel.

How signal is checked in a pressure transmitter

Step 1. First, we check whether transmitter is ON or off.
Step 2., if the Transmitter is off that means 24 V DC is not coming to Transmitter.
Step 3. If the Transmitter is ON, we will check  reading of pressure transmitter coming in the display.
Step 4. Then open the terminal box case of the transmitter and see if there is a losing or not of connections if losing then tighten the connections.
Step 5. then after we check whether a wire is grounded or not for this use multimeter.
Step 6. after this check how many milli amperes transmitter output is. For this put multimeter on m amp mode on + ive wire of multimeter connect to check terminal and –ive wire is connected to – ive of the transmitter. Then check m amp according to pressure are correct or not.
Step 7. Now we will check signal in the panel. For this disconnect + ive wire of panel from its terminal. Now connect multimeter in disconnected wire and the terminal from where wire is disconnected.
Another method of above Step is to disconnect fuse or open fuse from panel then put multimeter set on m amp and check on both sides of fuse.

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