LOOP POWERED ISOLATOR
Description
Function :
Loop Powered Isolator is an ideal solution for all problems of isolating an existing 4 – 20 mA signal loop for use with additional instrument. It accepts 4 – 20 mA input & provides a 4 – 20 mA output which is galvanically isolated from the input loop, with a transfer ratio of 1:1.
| Isolator uses a minimal power from the Parent loop. |
| Does not require any external supply. |
| Provides galvanic isolation between input and output loop. |
| Low input impedance. |
| Easy to install. |
| High conversion accuracy at low cost. |
| Current signal ratio is 1:1. |
| Thermoplastic / ABS, DIN rail mounting enclosure, suitable for 35mm rail. |
Input
| Input Current (Ii) | : Unipolar DC signal, 4-20 mA |
|---|---|
| Max Input Voltage (Vi) | : Vi < 15V |
| Permissible Ripple On Input | : < 10% |
| Drop Across Unit (VD) | : 3V (Approx) With Output Shorted, 8V (Approx)With RL = 250 Ω |
| Input Resistance (Rin) | : Depends Upon RL On Output Side Rin = @ 150 Ω + RL |
| Max Current | : 50 mA Continuous |
Output
| Output Current (Ii) | : Unipolar DC Signal, Value Same As Input Signal |
|---|---|
| Transfer Ratio | : 1:1 |
| Residual Ripple | : 0.5 % (@8kHz) |
| Time Constant | : 100 msec (Approx) |
| Drop Across Load (VL) | : VL = Io X RL (VL=Vi-VD) |
| Overall Accuracy | : +/- 0.1% FS Under Standard Operating Conditions |
| Loading Effect | : 0.1 % Per 100 Ohms, Upto 250 Ohms Load |
| H.V. Rating | : 2KV Peak For 1 Minute |
Isolation of input 4-20 mA Signal for the purpose of Automation, data logging etc.
