Our infrared basis weight and moisture sensor uses four channels for measuring energy absorption related to specific infrared wavelenght, due to pulp and water proportion in the sheet under measurement.
Two different reference wavelenght are used to achieve results precision and steadiness.
The measurement element is a lead sulfide cell, operated at a constant temperature  (+/- 0.1°C) using an high precision current regulation in a Peltier cell integrated in the device.
The different wavelenghts are selected by means of several optical filters in infrared range with very narrow band, to exclude effects on the measurement from the additives used in the paper production.
Laminar air flow are used to clean dust and particles that could build up on the reading windows.

Basis weight specifications

Measurement area20 mm*mm
Repeatibility+/- 0.20 % (2 sigma)
Static precision +/- 0.20 % (2 sigma)
Dinamic precision (reference TAPPI)+/- 0.25 % (2 sigma)
Emitter-receiver distance (air gap)7.5 – 12.7 mm (0.31” – 0.5”)
Measurement rangefrom 8 to 65 gr/(m*m)
Maximum operating temperature85 °C with air cooling

Moisture specifications

Measurement area20 mm*mm
Static precision +/- 0.10%
Dinamic precision (reference TAPPI)+/- 0.15%
Repeatibility(reference TAPPI)+/- 0.10%
Measurement rangefrom 0 to 15%
Maximum operating temperature85 °C with air cooling