Application Notes

EAP-031034

We have a project to measure the temperature of a deep well about 1000 meters under the ground with Pt100 ohms, resistance temperature detector. Do you have any idea on this?

Generally, the 0.5 mm diameter cable's resistance is about 100 ohms per 1 km (0.62 mile). If you use 0.5 mm diameter or longer cable to RTD sensor (Pt100 ohms ), M-System's RTD transmitter, model M2RS meets your application. M2RS applies 2 mA current to Pt100 ohms and allows 200 ohms of leadwire resistance per wire between RTD sensor (Pt100 ohms) and M2RS.

In this case, the depth of the well is about 1000m and leadwire resistance is estimated about 100 ohms per wire. Therefore there is no problem for M2RS to measure temperature of the well, 1000m depths. Upscale burnout is standard but downscale or no-burnout available as an option.

M-System has flexible solutions to meet your specific application and requirements. Consult our Signal Conditioners Data Library.