I have been attempting to read a pressure transmitter, which outputs a 4-20mA signal, with my raspberry pi 3b+. Because the PI doesn't read analog the first step has been to take the 4-20mA and convert it to a 0-5 VDC signal using a DROK voltage converter. Once the signal has been converted to analog voltage it will then be the single input into an Adafruit ads1115 module, which will take it to digital and communicate with PI via I2c. See below.
Before adding the pressure transmitter to the circuit I opted to use a current signal generator to make sure things were working so that I don’t wreck my pressure transmitter.
I am having the following problem:
The current to voltage converter will not output a voltage greater than zero. The input current to the module has been verified by measuring the voltage drop across an inline resistor. I also separately verified my analog to digital converter is working correctly using a voltage signal generator. Below is a diagram of the set-up I am using to verify/calibrate my current to voltage converter. Are there any potential issues with this set-up? I have attached the datasheet for the converter below. Any help would be much appreciated!