A comparator is a precision instrument used to compare the Dimensions of a given working component with the actual working standard. There are different types of comparators are available. In this article, we are going to discuss the Fluid Displacement Comparator.
A Fluid Displacement comparator is a type of comparator which has very limited applications and works on the principle of the liquid rise in capillarity tube.
Let’s see how the fluid displacement comparator is working.
Fluid Displacement Comparator working Principle
List of Components
- Capillarity tube
- Graduated Scale
- Fluid Chamber
These are the main components in Fluid displacement comparator. See the following schematic diagram of the fluid displacement comparator.
- A capillary tube is used along with a graduated scale attached to it.
- This arrangement is placed on the fluid chamber as shown in the above schematic diagram. This fluid chamber is having a relatively large cross-sectional area. It is filled with the low viscosity fluid.
- At the bottom of the fluid chamber, there is a diaphragm is arranged.
- A plunger is attached at the bottom of the diaphragm. This plunger captures the deflection and transmits to the diaphragm.
- When the workpiece is contacted with the plunger the deflection will be transmitted to the diaphragm.
- The diaphragm will get deflected and a small rise in liquid level in the capillary tube occurs.
- This will be measured with the help of the scale attached to the capillary tube.
- When the workpiece removed from contact with the plunger the diaphragm will get its original position. And The liquid level in the capillary tube gets back to its original position.
we can achieve up to 1500 magnification with the fluid displacement comparators.
Due to the certain disadvantages, fluid displacement comparators are have limited applications.
The major one that the liquid will be expanded to the temperature rise so not suitable for all temperature conditions.