DIGITAL BRIGHTNESS AND OPACITY TESTER

(TECHNIBRITE/ELREPHO TYPE)

BRIGHTNESS and OPACITY TESTER was developed to meet the paper industry’s needs for accurate and reliable measurement of BRIGHTNESS  and OPACITY. Its designConforms to the international standard , ISO2469, 2470 , 2471 , SCAN- P3 & P8 , TAPPI 525 , 534 , 519 , BSI 4432/ pt. 1,2,3, CAPPA E.1

FEATURE

    Dual beam optical system effectively Cancels out drift due to voltage and  temperature  .

    Internal highly stabilized  voltage Supply and surge suppression are  Provided , no external stabilizers  are Required .

    Fast & simple replacement of gloss trap to include or exclude specular Gloss .

    Fast & easy selection of custom filter for brightness and opacity measurement.

    No water cooling or external ventilation required

    Digital reading appears instantaneously as sample is presented to the instrument

    IIIumination by long life quartz – tungsten – halogen lamps at over 2000 hours

               Operation –lamp replacement  is simple with no realignment necessary

    integrating sphere coated with a stable white barium sulphate paint.

SPECIFICATIONS :-

    Integrating spheres diameter – 15 cm.

    Total area of aperature in sphere- less than 7.5 % of the sphere area.

    Gloss Type subtends half angel of 15.5” surrounding emerging sample beam

    Sample aperature – circular with 34 mm diameter.

    Sample area of view – circular with 30 mm diameter.

    Accepted reflected beams – perpendicular within 0⁰ to 1⁰  and confined to cones of 3.5” half angles. 

    Accuracy of ISO standards + 0.3%.

    Max Photometeric Linearity Error 0.1%

    Power Supply 230 + 5% volts, 50VA, 50 Hz.

BRIGHTNESS :-

ISO Brightness is the reflectance of blue light (with an affective wave length of 457nanometers) measured under carefully controlled geometric, photometric conditions. 

OPACITY

ISO Opacity, in accordance with ISO standard 2471 measures with this meter directly.

R₀ is obtained by measuring the reflectance of a single sheet backed with a black material.

R₀₀  contained by measuring single sheet backed by multiple sheets of the same material. ISO opacity, which is the ratio R₀ /R_0c is automatically read out by the instrument. Custom filter

Selection provides accurate agreement wuth the ISO 2471 spectral response function at effective wave length 557 nanometer.

Right is reserved for changes in design.