What is Fail Safe Condition in Pressure Switch | Proof Pressure Rating & Burst Pressure Explained

This calibration video about major types of pressure switch and what is fail safe condition in pressure switch. If you have any questions about this video, please do ask me in comment box. And if you need calibration video on specific topic such as Flow Measurement, Level Measurement, Temperature Measurement, then please let us know on comment box.
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Video Content:
1. What are two types of pressure switches?
2. What is fail safe condition?
3. What is proof rating of the switch, and what is burst pressure?
4. Why is it undesirable to have very little differential pressure or dead band in a Pressure Switch?
1.What are two types of pressure switch?
There are two main types of pressure switch.
1. Mechanical or Electromechanical.
2. Electronic or Solid State.
What is mechanical pressure switch?
Mechanical Switch has diaphragm or Piston. This piston opens or closes circuit when the pressure in the medium
rises or drops to a certain value.
Every time the pressure reaches the switch point, the diaphragm or piston transfers the pressure to a micro switch.
What is electronic or solid state pressure switch?
An Electronic pressure switch is based on an Electronic Pressure Sensor.
It is often referred as Pressure Transmitter.
Electronic pressure switch has integrated electronic switches used to open or close the electric circuit, and it performs simple control tasks.
Electronic version of Pressure Switch has digital display. It has adjustable Switch Points, and considerable higher reliability.
What is fail safe condition ?
Fail Safe Condition, pressure Switch is wired such that, any loss of power will cause the alarm to activate.
Generally this means that, the control system will alarm on a logical zero or 0 volt.
Therefore, under normal, healthy operations, the control system will receive a logical "1" or 24 volt from the pressure switch.
In example, we have taken normally close contact of pressure switch .
This normally close contact gets open, when any power loss or power failure occurs.
In addition to this, one normally close push button is connected in series with pressure switch in order to check the system.
What is proof pressure rating in pressure switch? And, what is burst pressure?
Proof Pressure is the maximum amount of overpressure that can be applied to the pressure switch without causing damage.
In order to check proof pressure rating, pressure switch can be exposed to pressure reaching proof pressure rating, and be expected to work properly when the pressure returns to within the rated operating pressure range.
If pressure surges or spikes are anticipated in an application, a pressure switch with high proof pressure should be selected to avoid damage.
Burst Pressure is the amount of overpressure applied to pressure switch at which the pressure switch will certainly be damaged.
Pressure switch may be damaged at any point between the proof pressure and burst pressure.
Why is it undesirable to have very little differential pressure or dead band in a Pressure Switch?
Microswitch of pressure switch will chatter when the dead band is very little. This chatter sometimes cause permanent damage to pressure switch.
In addition to this, If pressure switch is used to turn on the motor, this rapid contact changes force motor to turn ON and OFF frequently.
And this may cause problem to motor. Sometimes, motor winding will burn out because of this.
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[@khalidkerbache7963]

Thanks Sir for explaining, can you explain pressure switch principle work.

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