Metrohm NIRS Analyzer PRO - Manual (Page 15)

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3.3 Direct Light
In-line analysis of products where direct contact with the product is not technically feasible, such as
product transported on a conveyor belt or similar means of movement.
Lens: Sapphire; diameter 45 mm (1.8”), thickness 12 mm (0.5”), with EPDM O-ring
seal for reliable, temperature resistant sealing
Distance: 100-250 mm to sample surface (4 to 10”)
Scanning Area: 20 - 85 mm (0.8 to 3.3”) diameter, depending upon distance to sample