Fairbanks X SERIES PR 5220 ETHERNET TRANSMITTER - Manual (Page 96)

Section 12: Specifications
05/11 97 51209 Revision 2
12.4 Weighing Electronics
The weighing electronics are suitable for connection of strain-gauge load cells.
12.4.1 Load Cells
Load cell type Strain gauge, 6 or 4-wire connection possible
Supply voltage U= 12V DC for I
max
= 160 mA
for up to 8 load cells of 650 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
Cable length Max. 500 m
12.4.2 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
12.4.3 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
) < 0.02 µV/K RTI <= 0.004%/10K at 1mV/V
Span stability error (TK
Spn
) < +/- 2 ppm/K
12.4.4 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