Disclosed herein are sensors for sensing analyte concentration values, and methods of operating such sensors. The sensors include a sensor probe comprising two electrodes； a voltage controller operably connected to the two electrodes of the probe, the voltage controller operable to apply multiple voltage pulses to one of the electrodes； a current sensor operable to measure a current response to the multiple voltage pulses； and a processor module operably connected to the current sensor, the processor module operable to calibrate the current sensor on the basis of the current response.
