Ronan X96S WEIGH SCALE Manuel d'utilisateur télécharger pdf (Page 9)

Principles of Operation

The detector's raw output signal is processed through several stages of software in the X96S.

Some of the more significant stages of signal processing are:

• Units Conversion – conversion of counts into user-selected weight units

• Measurement Range – 4-20 mA output defined by the user-selected range in user-selected units.

• Digital Filtering – signal smoothing to reduce statistical radiation noise

• Dynamic Tracking – quick gage response to quick process changes.

• Source Decay Compensation – automatic compensation for the radioisotope decay

• Calibration (Referencing) – calibration of gage to user process.

The Calibration (and Referencing) procedure relates detector output (in counts) to numeric values that accurately represent the

actual process weight.

The weight algorithm (or curve) used by the X96S software is a logrithmic function. That is, the relationship between the

detector output and the process mass denisty is mathematically expressed as:

uTIc

LnRRc ××+= )

()(

Where:

= Reference weight with empty conveyor

= Current weight on the conveyor

= Detector signal with empty conveyor

= Current detector signal with material on the conveyor

a = Width of the conveyor in units of feet (or meter)

uT = Mass absorption coefficient, which for Cs-137 approximately equals 0.04 ft

/lb or (0.008 M

/kg)

Ln = Natural Log

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Ronan X96S WEIGH SCALE Manuel d'utilisateur Page 9