0 - 2.5V to 4-20mA Transmitter

Hello Joc,

I suggest you use the XTR111 in the configuration shown below:

Here's the simulation file:
XTR111_2p5V_to_4-20mA.TSC

Mr, Collin

Thank you for your quick reply and for useful solution. What kind of resistors should I use? Metal film resistors with small tolerance? Is it possible to design circuit with zero and span trimmer potentiometer (in the case of adjustment)? Can you check and comment the circuit (zero, span trim pot. - schema below)?

Best regards!

Joc

XTR111_2p5V_to_4-20mA_span_zero_joc.TSC

Hi Joc,

The trim circuitry you've included is correct and will be useful to calibrate each system. 

You should choose resistors based on your application's requirements.  If you need a high accuracy system, then you'll likely have to buy more expensive resistors and trim potentiometers.  If the application needs to maintain high accuracy over temperature then you'll need to purchase low-drift resistors and trim potentiometers.