DJB-4 and RDT 52.pdf

Specifications

DJB - 4 Digital Juction Box

SCALE CALIBRATION & FUCTIONS

CALIBRATION: Two calibration points (zero and span). Electronic calibration via the m V/V output values of load cells. Digital corner adjustment. Scale parametrization via serial commands (coming from PC or the remote display terminal RDT52)
WEIGHING FUNCTIONS: Zero, tare, auto-zero on power-up, automatic zero-tracking, continuous error detection
DISPLAY DIGITS: 5
DISPLAY STEP: 1, 2, 5, 10, 20, 50

A/D CONVERTER

TYPE: Sigma Delta ratiometric, 550,000 Counts
CONVERSION RATE: 8, 20, 40 , 80 measurements per second, divided by the number of load cells connected
ANALOGUE SIGNAL RANGE: -0.25 to 4 mV / V for each load cell ( - 1.25mV to 20 mV )
SENSITIVITY: 0.4 μV / d
RESOLUTION: Selectable up to 99,000 dd (in conformity with application and regulations)
DIGITAL FILTER: Rolling average (1,2,4 samples)
INPUT AMPLIFIER: Input noise 0.3μVp-p. Analoglter passive, 2pole 10Hz.

POWER SUPPLY

REQUIREMENTS: 7 – 10 VAC or 7.5 – 12 VDC external
CONSUPTION: 1.8 W max. by 4 load cells connected

ENVIRONMENTAL CONDITIONS / CONSTRUCTION

EMC: In accordance with the EN 45501 regulations
OPERATING TEMPERATURE: -10 oC to +40 oC
STORAGE TEMPERATURE: -20 oC to +55 oC
ENCLOSURE: Inox box, sealed to IP67, Dimensions (in mm): 200 x 105 x 45

LINEARITY & STABILITY

LINEARITY: Within 0,002% of full scale
TEMPERATURE COEF. (ZERO): < 2 ppm / oC
TEMPERATURE COEF. (SPAN): < 2 ppm / oC
LONG TERM STABILITY: 0.005 % of full scale per year

LOAD CELL CONNECTION

SERIAL COM. PORT (x1): RS485A , half duplex. Baudrate 2400 to 115200 (Setup selectable)
DIGITAL INPUT (x1): 24Vdc +20% negative common. Input impedance 3.3 KΩ. On/O delay 2msec.Opto-isolated to 2.5KV
DIGITAL OUTPUT (x2): 24Vdc +10%, Transistor (sink) negative common. Max current 10mA. Max ostate voltage 30Vdc. Leakage current 50μA. On/o delay 2msec. Opto-isolated to 2.5KV
ANALOGUE OUTPUT: Current (hardware selectable 0-20 m A oder 4-20 m A, opto-isolated)
(OPTIONAL): Power supply external 15-24 VDC, resolution 16 bit

APPROVALS

ACCURACY CLASS III: EU-Type approval for 10,000 divisions (approval Nr.: DK0199.27) & OIML R76

RDT 52 Remote Display Monitor

APPROVALS: Approval Nr.: DK0199.27 & OIML R76
DISPLAY – KEYBOARD: 6-digit, LED display(14mm). 6 key membrane keyboard with tactile feedback
ENCLOSURE: Panel mount enclosure, Dimensions(in mm): 144(L)x72(H)x70(D)
INTERFACES: RS485 (2.4 – 115 K Baud ) (by RDT52A) RS485 + RS232 (1,2Kbaud (by RDT 52B)
POWER SUPPLY: 7.5 - 10 V AC or 6-12 V DC, power consumption 1,8W max.
REAL-TIME-CLOCK: Only by RDT52B, battery backed , totalizing register