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support for two channel 4-20mA loop powered transmitter

Other Parts Discussed in Thread: XTR116, XTR111

hi, 

We trying to design two channel 4-20 mA loop powered transmitter for Temperature and Relative humidity. my issue is, how to use ground signal in loop powered design. i have attached block diagram image for my application.if you have solution for loop powered 4-20 mA. please support.