Weatherproof differential pressure switch is a device used to monitor and control the differential pressure between two points in a process. It is designed to withstand exposure to outdoor elements such as rain, dust, and extreme temperatures, making it suitable for use in outdoor applications. The switch is typically housed in a weatherproof enclosure made of durable materials such as stainless steel or polycarbonate, which protects the internal components from moisture and other environmental factors. The differential pressure switch works by measuring the difference in pressure between two points in a process and activating a switch when a predetermined pressure threshold is reached. This switch can be used to trigger alarms or control other equipment in the process, helping to maintain safe and efficient operations.