KxS Retractable refractometer DCM-20 PASVE® system configurations
Purpose-built systems for kraft pulp mill applications
KxS offers three specialized DCM-20 PASVE® system configurations, each engineered to meet the specific demands of applications with the highest level of optical reliability. The DCM-20 PASVE® system for black liquor in evaporators and recovery boilers is our most widely used configuration.
DCM-20 PASVE® system for black liquor consists of:
- Retractable refractometer DCM-20 PASVE® sensor
- PASVE® Isolation valve
- Prism wash system with steam
- Modular connection unit MCU with wash relays
Other system variants are for:
- Green liquor: designed to resist heavy scaling and maintain accurate readings using prism wash with hot condensate water
- Brown stock washing filtrates: optimized for suspensions with abrasive content and minimal wash needs
All pulp mill applications are covered with same interchangeable sensor, reducing complexity in spare unit management.
Patented KxS DCM-20 PASVE® safety design
KxS has designed the DCM-20 PASVE® system with patented safety features to protect both your process and your personnel. At the heart of the system is the PASVE® isolation valve, a field-proven solution trusted by the pulp industry with over 75,000 installations worldwide.
Four independent safety layers safeguard operator and prevent unintended sensor removal:
- Sensor safety stopper
- Safety guide
- Safety clamp
- Safety thread
Optimal footprint, easy installation​
The DCM-20 PASVE®, with its compact design, offers exceptional flexibility for choosing installation points in vertical and horizontal pipe lines within the pulp mill. Its small footprint ensures easy integration into various setups, optimizing space and service efficiency.
What makes DCM-20 PASVE® practically maintenance-free?
KxS DCM-20 PASVE® system is designed to operate longer and more reliably—with virtually no need for routine maintenance. This is a result of expertise, smart engineering, and advanced optical performance tailored for the toughest pulp mill conditions.
Future-ready solution for full BLRBAC compliance
DCM-20 PASVE® is designed in alignment with the BLRBAC (Black Liquor Recovery Boiler Advisory Committee) good recommended practice for the safe firing of black liquor recovery boilers. Integrated divert system, a key BLRBAC safety recommendation, is part of our product roadmap, and will also soon enable full BLRBAC compliance for mills that require it.
Key features
- Durable, industry-proven construction withstands high temperatures, scaling, pressure fluctuations, and chemical exposure.
- Most modern CMOS-based optics is accurate, and stable without sensitivity to light scatter.
- Advanced 6th generation image detection identifies only real fouling, triggering wash cycles only when truly needed. This reduces unnecessary washing that can cause prism erosion.
- Nozzle made of SAF2507 super duplex stainless steel for superior wear resistance and fully embedded in the hot process zone, maintaining high temperature and preventing clogging.
Reliability. Expertise. Personal service.
At KxS, we know that reliable process measurement goes beyond the refractometer itself. It requires a combination of expert guidance, precise installation, and tailored support to meet the unique challenges of each application.
Whether you are working with black liquor, green liquor, or brown stock washing filtrates, choosing the right components and installing them correctly is essential. That is why we offer dedicated expertise throughout the entire lifecycle of your DCM-20 PASVE® system—from configuration and installation to optimization and long-term support.
Instructional YouTube videos:
How to operate DCM-20 PASVE
Step-by-step guidance for inserting and removing refractometer and wash nozzle
Removing and inserting refractometer:
Inserting refractometer:
Removing refractometer: