Model HHF-301 system is equipped with a high-performance

β

-ray sensor

a high precision "O" frame scanner and a dedicated microprocessor. In comparison with the conventional

β

-ray basis weight gauge this intelligent system features its superior accuracies of calibration and of on-line measurement reaching to ±0.1% and to ±0.25% respectively

which is based upon a polynomial exponential calculation of basis weight

accurate compensations for various on-line measuring errors

and a specially designed software. Its operation over one year at Beijing No.1 Paper Mill has proved that this system is of high stability and reliability.