Retention control is important to papermakers due to the large influence it has on paper quality variability reduction. ABB’s ultimate solution for monitoring and control of paper or board machine retention is KPM KRA and KRT Retention Measurement.

Benefits:

• MD variation reduction in:
  • Basis weight
  • Moisture content
  • Ash content
• Web break reduction
• Faster grade changes and start-ups
• Optimization of retention chemicals

Retention Measurement System
ABB offers two options for paper and board machine retention monitoring and control: the KPM KRA sensor measures total consistency and ash consistency, while the KPM KRT sensor is for total consistency only. The measurement range for total consistency is 0-2.0 percent Cs and 0-1.0 percent for ash consistency.

Robust design and construction
The sensor is constructed of 316SS with an unbreakable stainless steel measurement cell, enabling the sensors to withstand harsh environments. The display unit and sensor have protection class of IP65 (Nema 4X) and do not need protective housing to withstand difficult conditions at the paper machine wet end.

Maintenance-free operations
Automatic flushing with water can be included to keep the sensors clean without maintenance. The optical sensor has a 3 mm gap between the lenses, which produces a self-cleaning effect due to the increased velocity. The white water sensor also has self-cleaning due to an automatic backflushing module.