DD-23 Vaisala K-PATENTS® Digital Shunt Control System

Vaisala K-PATENTS® Digital Shunt Control System DD-23- Recovery Boiler Safety

The Vaisala K-PATENTS SAFE-DRIVE Process Refractometer sensor is fitted with a SAFE-DRIVE isolation valve to safely and easily insert and retract the refractometer at full operating pressure without closing the liquid line valve or closing the process. The SAFE-DRIVE isolation valve contains a steam cleaning system for automatic cleaning of the prism. The system contains a SAFE-DRIVE Retractor tool SDR-23 for safely inserting and retracting sensors.

Each refractometer is a completely independent measurement system. Each system sends a separate mA output signal that can be used by the control system or the DCS.

The DD-23 system is fully controlled by a microprocessor. Digital signal transmission and diagnostics implemented by the microprocessor ensure error-free operation.

feature:

1. An all-digital system from sensor to transmitter. The system is fully controlled by the microprocessor and all analog circuits have been eliminated.

2. Digital signal transmission and diagnostics performed by the microprocessor ensure error-free operation.

3. The system eliminates false alarms because it only reacts when the solid level is truly below the safe limit. By using K-Patents DD-23, costly process interference due to unauthorized transfer operations can be avoided.

4. Easy to operate and clear multi-diagnostic information.

5. K-Patents Safe-Drive ® isolators and extenders allow SAFE and easy insertion and removal of refractometer sensors at full process pressure. Easy to place and self-fixed design. Triple seal through two lip seals and an O-ring.

6. The SAFE-DRIVE® shrinker protects the user from accidental overflows during shrinking and insertion.

7. Prevent accidental opening or closing of the isolation ball valve.

8. Retractable prism cleaning nozzles can be safely removed for maintenance inspection.

9. Remote monitoring using a standard web browser: real-time measurement data, shunt status, measured values, diagnostic messages and event logging can be provided remotely to the control room via an Ethernet connection.

10. Alarm and contact functions: low solid content and refractometer difference warning and alarm relays. Meter and system status relays. Cutting table cleaning switch. Contact input for external transfer switch and hardwired transfer reset