Wednesday, May 24, 2017

#563 : P - Pressure Transmitters

One of my favourite topics from the whole list. Two years of my engineering course was spent studying all sorts of instruments including these interesting devices called pressure transmitters.

As the name implies, these instruments are used to measure the pressure of gasses or liquids. In a crude sense, a pressure transmitter encases a sensor for pressure measurement and a transmitter to transmit the values. There are over 50 types of pressure transmitters. In fact, in certain level measurement applications, pressure is the actual measured parameter.

Why do we need to measure pressure in first place? Think of the most common application. You have a pump filling a tank. Without any measurement in place you need to probably keep looking at the tank to know if it's full. Now imagine the tank is a bit far off from the pump and there is a pipeline running. Imagine having to run around and check if the tank is full or if the motor is pumping. This can be solved by putting a level transmitter on the tank and a pressure transmitter at the outlet of the pump. These devices, when interfaced with computers (in a real crude sense) lets you know if all things are going fine. One step further, one can use this to operate the pump!

Here is a picture of one part of a pressure transmitter.


That blue head that you see houses the circuitry needed to measure and transmit the values. The steel base below actually measures the pressure.

This is just a very crude primer of what a pressure transmitter is. I wanted to make sure that this write up was in complete layman terms so that people can get a vague sense of Instrumentation - The study of instruments (primarily used in factories). Going in depth, would simply result in boredom if you can't really appreciate it!

PS. Pritika, if you are reading this. Husband fellow of mine wanted me to write about you for "P". I would have probably written pages and pages worth essay. You my friend, you are worth it totally :-D


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