PR 5220 Instrument Manual Specifications
Sartorius EN-161
14.4 Weighing Electronics
The weighing electronics are suitable for connection of strain-gauge load cells.
14.4.1 Load Cells
Load cell type Strain gauge, 6 or 4-wire connection possible
Supply voltage U= 12V DC for I
= 160 mA
for up to 8 load cells of 650 Ω each
or 4 load cells of 350
each
Sense voltage monitoring Sense voltage below +4VDC -- -4VDC is detected; can be switched off
Max. load
≥75 Ω
Cable length Max. 500 m
14.4.2 Principle
Principle DC voltage, delta-sigma converter, ratiometric to the load cell supply voltage
Conversion/measurement time 5, 10, 20, 40, 80, 160, 320, 640, 960, 1200, 1600 ms
Digital filter Selectable, active 4th order (low-pass),
Characteristic: Bessel, aperiodic, Butterworth, Tschebyscheff
Configurable cut-off frequency
14.4.3 Accuracy and Stability
Accuracy class
10000 e (Cl. III) acc. to OIML R76 / EN 45501
Min. measuring signal (OIML) 0.5µV/e, i.e. 3 mV for 6000 e, 5 mV for 10000 e
Linearity error: <0.002 %
Zero stability error (TK
) <0.02 µV/K RTI <= 0.004%/10K at 1mV/V
Span stability error (TK
) < ±2 ppm/K
14.4.4 Sensitivity
Sensitivity 0.5 µV/e @ 10000e (Cl. III) OIML R76,
Resolution 7.5 million counts at 3mV/V, not legal for trade
Input voltage (input signal + dead load) 0 ... max. 36 mV DC, symmetrical to 0
Dead load range 36 mV DC (max. input signal); input/ calibration via software
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