www.cynergy3.com ? 2017 cynergy3 components, all rights reserved. specifications are subject to change without prior notice. cynergy3 components and the cynergy3 components logo are trademarks of cynergy3 components limited. iso 9001 certified cynergy3 components ltd. 7 cobham road ferndown industrial estate wimborne, dorset 21 7 bh pe SC420I 2017 telephone +44 (0) 1202 897969 email:sales@cynergy3.com made in the uk SC420I loop powered isolator 1kv isolation low cost solution low voltage drop powered from 4-20ma input high accuracy high noise immunity the SC420I loop powered isolator is a 0(4)- 20ma direct current isolator. the isolator derives its power from the input signal and therefore requires no external power supply. the output of the isolator can be connected to any potential within 1kv of the input negative terminal while transients of 2.5kv can be withstood. the isolator is typically used to enable two control and instrumentation devices, e.g. plc and local chart recorder, with non- isolated inputs, to monitor the same transmitter output simultaneously. alternatively the isolator can be used to isolate signals from non-isolated transmitters or as a noise reduction device. the device is housed in an ultra-compact din rail mounted enclosure, only 18mm wide. general specifications recommended operating conditions input current 0(4)-20ma output current 0(4)-20ma output resistance 0-600 . overload capacity 50ma input current environmental conditions storage temperature -40 to 100 oc operating ambient -15 to 70 oc relative humidity 0-90 % rh other considerations the voltage drop across the device at 20ma input is: vd = 3.2 + (rl x 0.02) technical specifications parameter min typ max comments supply voltage loop power input current 4ma 20ma full scale volt drop 3.2v 3.5v at 20ma input see note output linearity error 0.1% temp coefficient 90ppm/oc load resistance error -200na/ 0 < rl < 600 ? time constant (10-90%) 30ms operating ambient -15oc 70oc relative humidity 0% 90% isolation voltage 1kv supply voltage loop power input current -50ma 0-20ma +50ma full scale volt drop 3.2v 3.5v at 20ma input see note surge voltage 2.5kv for 50s transient of 10kv/s notes absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. device is protected against reverse polarity connection. accuracy figures based on 0-20ma input, 250 load resistance, and an ambient temperature of 20oc. add volt drop due to load: 0.02 x rl e.g. 250 load total volt drop = 3.5 + (0.02 x 250) = 8.5v installation data mounting din rail ts35 orientation any connections screw clamp with pressure plate conductor size 0.5-4.0mm insulation stripping 12mm weight approx 50g ordering information part no.: SC420I 4-20ma in 4-20ma out connection details 1. output channel +ve 2. output channel -ve 3. input channel +ve 4. input channel -ve 63mm 58mm 18mm
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