Fuji

Signal Converters

  Overview
The SDY is a versatile, 2-wire (loop-powered),
PC-Programmable Signal Isolator/Converter that
accepts current or voltage input and provides an
isolated, proportional 4-20mA output. See Figure 1
for a list of accommodated input types.
Typical uses for the SDY include:
• Isolating Signals to stop erratic process
measurements caused by ground loops
• Converting Signals so field instruments can
interface directly with indicators, recorders,
DCS’s, PLC’s, and PC-based SCADA systems
• Diverting Signals so the output from one
transmitter can be sent to two separate
locations
• Protecting Equipment and Signals by
eliminating common electrical paths
• Boosting Signals to enable more instruments
to be added to an overburdened loop
• Solving the “Bucking Power Supplies”
problem that occurs when a 4-wire transmitter
and a DCS both try to power the same process
loop
     
Technical Specification  
Performance Overall Accuracy:
±0.036% of span
(includes input accuracy,
output accuracy, and the
combined effects of
linearity, hysteresis,
repeatability, and
adjustment resolution).
Stability: Input to output
stability is 0.09% of span
for one year, 0.15% of
span for three years, and
0.20% of span for five
years.
Minimum Input Span:
Current, 1.0mA;
Voltage, 250mV
Isolation:
500VAC/1000VDC input
to output to case.
Measurement Cycle:
Updates 8 times per sec.
Response Time:
128msec from time input
is applied to the output
settling to the specified
output accuracy
Step Response:
128msec maximum for
the output to change
from 10% to 90% of its
scale for an input step
change of 0% to 100%
Input Impedance:
Voltage, 1MW;
Current, 20W
Load Effect: Negligible
within specified load
limits
Specifications		 Performance
(continued)		 Ripple:
10mV peak-to-peak
maximum (measured
across 250W resistor)
Power Supply Effect:
0.002% of span per 1V
change
Over-Voltage Protection:
48V, maximum on output;
48V reverse polarity
protection on output
Maximum Input
Overrange:
Current: 100mA
maximum continuous;
Voltage on Current Input:
±1.5Vdc peak; Voltage:
18Vdc
Load Capability:
Supply Voltage – 10V = W
0.024A
Output Current Limiting:
3.8mA (low) and
21.4mA (high)		 Operating Range:
–40°C to +85°C
(–40°F to +185°F)
Storage Range:
–40°C to +85°C
(–40°F to +185°F)
Effect of Ambient
Temperature on
Accuracy:
±0.015% of span/°C
Relative Humidity:
0-95%, non-condensing
RFI/EMI Immunity:
20V/m @ 20-1000MHz,
when tested according to
SAMA standard 33.1 abc;
20V/m @ 20-100MHz,
1K AM @ 80% when
tested according to IEC
1000-4-3-1995 with <0.5%
error
Common Mode
Rejection: 100dB,
minimum, @ 50/60Hz
Normal Mode Rejection:
60dB, typical, @ 1V peakto-
peak, 50/60Hz
HP Housing:
178g (6.3 oz)
BH Housing:
1.5kg (3.3 lbs)
D-BOX Housing:
688g (1 lb, 8.3 oz)
Display Type:
LCD; Top Row, 10.16mm
(0.4 inch) high black digits
on a reflective
background;
Bottom Row, 5.72mm
(0.225 inch) high black
digits on a reflective
background
Format: Two rows of five
alphanumeric characters
Range: -99999 to 99999
Minimum Display Span:
1.00