Block-type Differential Pressure Switches are used in applications. These are designed according to new block design to survive in harsh conditions. It has high vibration resistance. It has fixed, but low differential guarantees accurate monitoring of critical pressures. It can be delivered as standard options. It has a diaphragm that is driven in one direction or the other based upon the existing across the diaphragm. The pressure ranges are from 0.3 to 5 bar with adjustable differentials. It is fast and easy to operate and are easy to mount on block test valve. These are used in marine applications where space and reliability are the most important features.