Siemens SITRANS LUT400 - Page 5

LUT400 Communications Options
AG091712 5 of 13
APPLICATION GUIDE
For a 60-meter device, a similar calculation gives a typical error of 18.8 mm and worst-case error of 75 mm.
The measurement error is +/- 1 mm plus 0.17 % of the measurement which then equals up to 11mm at 60 meters.
Conclusion: using 4-20 mA can result in your value being out between 11 mm and 86 mm.