What is the difference between a coater and a dispenser?

The coating machine is a device that controls the fluid and applies the fluid to the surface of the product. The dispenser is also a device that controls the fluid and applies the fluid to the surface or inside of the product.
The coating machine is generally used to coat the circuit board with conformal paint, so that the circuit board has waterproof, moisture-proof and dust-proof properties, making the product quality better and longer life.
Then the coating of this circuit board is for the entire surface of the circuit board, and the valve body needs to be sprayed or coated on the surface of the product by spraying the glue. The dispensing of the dispensing machine generally has a predetermined point and line for pointing, dripping and coating operations.
The same is to control the fluid and work on the product. It seems that the dispenser can also be used as a coating machine. It is indeed the case. For the dispenser, it only needs to replace a spray valve to use it as a coating machine. , so the difference between the dispensing machine and the coating machine is the difference in the valve body.