Sensors for Tapio Analyzer

The available sensors for the Tapio Analyzer can be found below.

A close-up of the Tapio basis weight sensor positioned above a moving sheet on a roller bed, used for measuring grammage.

Basis Weight Sensor

  • Aperture: 5 mm circular
  • Measurement based on beta radiation (Kr-85 source)
  • Semiconductor detector
  • For all grades up to 1000 g/m^2
  • Wet end, stock approach, coating problem solutions
  • Verification and calibration of online measurements
Close-up of the Tapio Caliper sensor measuring the thickness of a paper sheet as it passes between two black sensor modules.

Caliper Sensor

  • Contact area: 0.3 mm circular (depending on pressure)
  • Measurement based on contacting caliper
  • Range up to 800 μm, can be extended
  • High accuracy caliper profile
  • Calender, press section problems
  • Printability estimation
  • Verification and calibration of online caliper measurements
Tapio Gloss Sensor measuring gloss on both sides of a paper sheet with a 75° angle.

Gloss Sensor

  • Aperture: 1x1.2 mm oval
  • Measurement based on 624 nm wavelength light
  • Dual-sided measurement of standard gloss & small scale gloss variation
  • Standard angle 75°
  • All grades, even base paper
  • Press section, rolls, felts
  • Coating, backing roll effect verification and identification, size press effects and other
  • Small scale gloss variation before and after printing (i.e. gloss mottling studies)
  • Verification and calibration of online measurements
  • Ideal for paper machine troubleshooting
Tapio Ash Sensor measuring filler content in coated paper using low-energy gamma radiation.

Ash Sensor

  • Aperture: 5 mm circular
  • Measurement based on low-energy x-rays (Fe-55 source)
  • Coated, filled grades
  • Retention problems
  • Coat weight, coating weight variation, coater optimization etc.
Tapio Transmission Sensor analyzing optical transmission properties of paper.

Transmission Sensor

  • Aperture: 1 mm circular
  • Measurement based on transmitted light
  • Wavelength selectable red (624 nm) or IR (875 nm)
  • Press section variations, moisture and temperature related variations
  • Optical formation and flock size analysis
  • In most grades transmission has good correlation to basis weight
  • Important when calender, press section and wet end effects must be separated from each other
Tapio Remission Sensor measuring brightness variations in paper with a 0.3 mm aperture.

Remission / Brightness Sensor

  • Aperture: 0.3 mm circular
  • Brightness variation of paper
  • All grades
  • Correlates well with coating variations
  • Calender blackening studies
  • White top board (see-through variation)
Tapio Porosity Sensor measuring air permeability of paper according to standard methods.

Porosity Sensor

  • Measurement area: 10 cm² (3.6 cm circular)
  • Measurement based on: air flow under constant controlled pressure
  • Air permeability measurement
  • Permeability variations for relevant grades
  • According to laboratory standards (Bendtsen, Gurley, Bekk, etc.)

The analyzer can be equipped with up to 16 sensors, allowing the measurement to be easily supplemented with custom sensors. The measurement interface allows both voltage and current signaling. Since all sensors measure the same physical point in paper, the density, bulk, relative ash and optical formation channels can be automatically calculated from measured data.

Tapio laboratory analyzer with labeled sensors for caliper, basis weight, transmission, ash, and gloss measurements.