The purpose of this circuit is to provide some form of manual offset for a 4-20mA driven gauge connected directly to a sensor. A 1-turn offset potentiometer (R1 on the XTR110) is intended to be panel mounted next to the gauge for easy adjustment. I have the following questions before building the circuit.
-Is the negative voltage on Pin 4 of the RCV420 absolutely necessary or can the IC function properly with only positive voltage connected to Pin 16?
-Figures 5 & 6 of the XTR110 data sheet show information for a 0-10V In to 4-20mA Out circuit. The resistor values for a 0-10V In circuit are R1=100KΩ, R2=100KΩ, R3=49.9KΩ, R4=36.1Ω. Will these resistors be adequate for 0-5V In? If not, what values are recommended?
-An MTP50P03HDL transistor is planned for use on the XTR110. Since VCC will be 12-15 VDC, 12-15 VDC will be applied to the transistor source via Pin 1. This transistor has a drain-source voltage of 30V and wonder if it will be adequate, and if not, is there a better recommendation?
Thanks and appreciate any assistance available.
