The 2505-XX has the Signet 2537 paddlewheel sensor electronics, mounted in the universal junction box. Use to easily upgrade paddlewheel sensors in the field. The electronics module mounts directly onto the pipe or wall, and is compatible with all GF and third party open collector output sensors with signal levels of 5 to 24 volts and output frequency up to 1000 Hz.
For more information, please see Data Sheet