420 Plus Installation Manual - Appendix
53
7.12
Specifications
Model Numbers
United States
420-2A (AC) (NEMA 5-15)
420-2C (DC)
International
420-2B (AC) (CEE-7)
420-2D (DC)
Power - AC
Line Voltages
115 or 230 VAC
Frequency
50 or 60 Hz
Power Consumption
1.5 A @ 115 VAC (8W)
0.75 A @ 230 VAC (8W)
Fusing
2.5 A 5 x 20 mm fuse
Power - DC
Line Voltages
9-36 VDC DC Input
Power Consumption
1.5 A Max
Fusing
Internal short circuit protection
Analog Specifications
Full Scale Input Signal Up to 22.5 mV
Excitation Voltage
+5V single sided
8 x 350
or 16 x 700
load cells
Sense Amplifier
Differential amplifier with
4- and 6-wire sensing
Analog Signal
Input Range
–0.5 mV/V to +4.5 mV/V
Analog Signal
Sensitivity
0.3
V/graduation minimum,
1.5
V/grad recommended
Input Impedance
200 M
, typical
Noise (ref to input)
0.3
V p-p with digital filters at 4-4-4
Internal Resolution
8,000,000 counts
Display Resolution
100 000 dd
Measurement Rate
Up to 60 measurements/sec
Input Sensitivity
10 nV per internal count
System Linearity
Within 0.01% of full scale
Zero Stability
150 nV/°C, maximum
Span Stability
3.5 ppm/°C, maximum
Calibration Method
Software, constants stored in
EEPROM
Common Mode
Voltage
–2.35 to +3.45 V, referred to ground
Rejection
130 dB minimum @ 50 or 60 Hz
Normal Mode
Rejection
90 dB minimum @ 50 or 60 Hz
Input Overload
± 12 V continuous, static discharge
protected
RFI Protection
Signal, excitation, and sense lines
protected by capacitor bypass
Analog Output
Optional: fully isolated, voltage or
current output,14-bit resolution.
Voltage output: 0 –10 VDC
Load resistance:1K
minimum
Current output: 4–20 mA
External loop resistance: 500
maximum
Digital Specifications
Microcomputer
Phillips PXAG30K main processor @
19.6608 MHz
Digital Inputs
2 inputs, TTL or switch closure,
active-low
Digital Outputs
2 outputs, 250 mA Max Sink
Digital Filters
3 filters, software selectable
Serial Communications
EDP Port
Full duplex RS-232
Printer Port
fully capable RS-232 or active 20 mA
current loop (transmit only)
Both Ports
38400, 19200, 9600, 4800, 2400,
1200, 600, 300 bps; 7 or 8 data bits;
even, odd, or no parity
Operator Interface
Display
6-digit LED display. 7-segment, 0.8 in
(20 mm) digits
LED annunciators
Gross, net, center of zero, standstill,
lb/primary units, kg/secondary units,
count, tare
Keypad
21-key flat membrane panel
Environmental
Operating Temperature –10 to +40°C (legal);
–10 to +50°C (industrial)
Storage Temperature
–25 to +70°C
Humidity
0–95% relative humidity
Enclosure
Enclosure Dimensions 9.5 in x 6 in x 3.12 in
24 cm x 15 cm x 8 cm
Weight
2.8 Kg (6.1 lb)
Rating/Material
UL Type 4X
Certifications and Approvals
NTEP
CoC Number
04-076
Accuracy Class
III/III L
n
max
: 10 000
Measurement Canada (Pending)
Accuracy Class
III/III HD
n
max
: 10 000
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