The 420i 4-20mA loop powered isolator is typically used to provide an isolated 4-20mA current loop from any existing 4-20mA loop. This isolated 4-20mA can then be connected to any input stage without affecting other signals connected to the same earth. The output can be connected to any potential within 1kV of the input negative terminal while transients of 2.5kV can be withstood.
- Isolated 4-20mA output
- Loop powered
- Low Voltage drop
- High Accuracy, better than 0.1%
- 1kV Isolation
Product Description
The 420i 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 is typically used to enable two control 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.
Two variants are available. The 420i-1 which has a built in precision 250Ω resistor to give a 1-5V output, and the 420V which gives a 0-10V output from a 4-20mA input, whilst dropping just 5V from the input loop.
Another typical application is to use the 420i to enable two instruments to monitor the same 4-20mA at the same time. The 420i is wired in series with the input of the first instrument and then the output wired to the second.
The 420i also acts as a noise reduction device, giving a ‘clean’ 4-20mA output.
Isolator Types
420i
4 to 20 milliamp isolated output signal
- SKU ID: s1-420i-0001
- Part No: II-420i-AA-8-000
- Input Signal: 0-20mA or 4-20mA
- Output Signal: 4-20mA
- Power Supply: Loop powered
- Installation: DIN Rail TS35
- Electrical Connections: Screw clamp with pressure plate
420i-1
1 to 5 volt dc isolated output signal
- SKU ID: s1-420i-0002
- Part No: II-420i-AA-8-000
- Input Signal: 0-20mA or 4-20mA
- Output Signal: 1-5Vdc
- Power Supply: Loop powered
- Installation: DIN Rail TS35
- Electrical Connections: Screw clamp with pressure plate
420V
0 to 10 volt dc isolated output signal
- SKU ID: s1-420v-0001
- Part No: II-420i-AA-8-000
- Input Signal: 0-20mA or 4-20mA
- Output Signal: 0-10Vdc
- Power Supply: Loop powered
- Installation: DIN Rail TS35
- Electrical Connections: Screw clamp with pressure plate