Vaisala K-PATENTS DD-23 system includes two K-Patents SAFE-DRIVE Refractometer PR-23-SD sensors in the main black liquor line, and two Indicating transmitters and a Divert control unit in an integrated panel. Remote monitoring, and event data logging is via Ethernet.
Vaisala K-PATENTS SAFE-DRIVE Process refractometer sensors are installed with SAFE-DRIVE Isolation valve that allows for safe and easy insertion and retraction of the refractometers under full operating pressure without having to valve off the liquor piping or having to shut down the process. The SAFE-DRIVE Isolation valve contains a steam wash system for automatic prism cleaning. The system contains a SAFE-DRIVE Retractor tool SDR-23 for safe sensor insertion and retraction.
Each refractometer is a completely independent measurement system. Each system sends a separate mA output signal, which can be used by a control system or a DCS.
The DD-23 system is completely microprocessor controlled. The digital signal transmission and microprocessor implemented diagnostics ensure error free operation.
Learn more How DD-23 is built to conform to the BRLBAC recommendations (pdf)