Lens options

Straight Lens Tubes

The Valmet Furnace Imaging System standard lens tubes are all high-performance, air-cooled, double-wall stainless steel construction. Lens tubes are available in lengths from 50 centimeters and longer, provided in increments of 40 centimeters. They are available with 20°, 30°, 64° or 120° fields of view. The narrow field of view provides the clearest information on the back wall. The wider field of view provides more information about the side walls and is typically used for viewing pulp mill recovery beds.

Off-Axis Lens Tube

The off-axis lenses provide a rotating 360° view of the boiler walls during mobile inspections. Because the lens tip is fully inside the boiler, a thermocouple in the lens tip provides an overheating warning to the operator. Lens tubes are available in lengths from 70 centimeters and longer, and are provided in increments of 40 centimeters. They are available with a 30° field of view.