The 81509085 is a pneumatic pressure relay designed to convert pneumatic pressure signals into electrical outputs for control and monitoring applications. It features adjustable switching pressure from 1 to 8 bars with a standard microswitch rated at 5 A / 220 V, providing both normally closed and normally open contact options. The device operates over a temperature range of -5°C to +50°C and delivers a mechanical life of 3×107 operations, ensuring reliable long-term performance in industrial environments. With its compact design and pneumatic indicator, the 81509085 is commonly used in automated machinery, safety systems, and process control applications where pneumatic-to-electrical signal conversion is required.