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SIGNAL ISOLATOR, DUAL OUTPUT--------------- ----------------------------------------------------------------BP4SI
 
REPEATER POWER SUPPLY, 4~20 mA, FOR 2-WIRE TRANSMITTER WITH 1 OR 2 4~20 mA OUTPUTS
REPEATER POWER SUPPLY, 0/4~20 mA, FOR CURRENT SOURCE WITH 1 OR 2 0/4~20 mA OUTPUTS
 
 

  • Three port isolation between input, outputs and
    power supply
  • Provides two outputs from one 4 to 20 mA
    transmitter or one 0/4~20 mA current source
  • Line fault detection feature provides alarm facilities
  • Transfer accuracy <0.1% of span
  • 17~35 V DC / 85~265 V AC/DC power supply
  • T section DIN Rail mounting
  • Input protection option
 
BP4SI is an independently powered isolator which provides both a fully isolated DC supply for energising a 2-wire transmitter while also transferring the transmitter current to two separate isolated output circuits driving loads upto 1 kΩ. The input can also be a 0/4~20 mA current source. Line fault detection feature (also isolated) is provided by an open collector which can be used to activate an alarm. When the input cable is broken, no current flows into terminal 8/10 and line fault detection(LFD) output is OFF. When a current greater than 1 mA flows in the input, then LFD output is ON. Power supply required is 17~35V DC/ 85~265 V AC/DC. An input protection option is also provided.
 
SPECIFICATIONS          All specifications at ambient of 25° C, unless specified otherwise
 
No. of input channels One
Input channel 2-wire transmitter supply,
4~20 mA OR
4~20 mA current source OR
0~20 mA current soure
No. of output channels Two.
Input / Output signal 4~20 mA OR 0~20 mA If
0~20 mA input is ordered, it
will work for 4~20 mA.
However, the power
requirement is higher.
Load resistance, each output 0~1 kΩ
Isolation between input, 1500 V DC/AC RMS, 1
minute
output 1, output 2  
and power supply  
Voltage available for transmitter 20 V typical at 20 mA
Voltage drop across input  
from current source  
With out protection 1.5 V maximum
With protection 3.0 V maximum
Input protection  
Against overvoltage 30 V DC maximum
Against overcurrent 50 mA maximum
Power supply a) 85~265 V AC / DC, 50/60
Hz OR
b) 17~35 V DC
Power consumption  
For C=0*  
Supplying transmitter 140 mA maximum at 20 V
DC
A=1* with a 20 mA signal 100 mA
maximum at 35 V DC with a
20 mA signal
From a current source 115 mA maximum at 20 V
DC
A=1* with a 20 mA signal 80 mA
maximum at 35 V DC with a
20 mA signal
Supplying a transmitter 180 mA maximum at 20 V
DC
A=0* with a 20 mA signal 130 mA
maximum at 35 V DC with a
20 mA signal
From a current source 150 mA maximum at 20 V
DC
A=0* with a 20 mA signal 105 mA
maximum at 35 V DC with a
20 mA signal
For C = 1* < 5 VA
Transfer accuracy at 25 °C  
for both outputs <± 0.1% of span
4~20 mA Better than 16µA
0~20 mA Better than 20µA
Line fault detection(LFD) Isolated transistor open
collector
output output
LFD characteristics  
Input current < 0.2 mA Transistor OFF
Max permitted voltage: 26 V
DC Max OFF leakage current
: 150 µA
Input current >1 mA Transistor ON
Max permitted input current :
50 mA Max ON voltage : 1V
Temperature coefficient  
of accuracy < 0.02% of span / °C
Common mode rejection ration 150 dB typical
Ambient temperature limits -20°C to + 55°C
(Operating)
-40°C to + 80°C (storage)
Humidity 5~95% RH, non-condensing
Enclosure  
Material ABS plastic
Dimensions       C=0*
                       C=1*
75(H) x 45(W) x 110(D) mm
75(H) x 55(W) x 110(D)mm
Mounting Snap on for 35mm DIN rail
to DIN 46277
Terminals Accomodate 2.5 mm2

conductors
Weight < 250 grams
Protection IP 20
 
CONNECTION DIAGRAMS
 
 
 
 
 
 
 
 
 
 
   
 

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