ORP_SENSOR

Hello there,
please clarify the following points on ORP sensor meter.

1. I went through the wiki page of this sensor, but it is not understandable that how can an Arduino ADC measure the -ve
voltage.
2. What is Analog output voltage range of the "analog ORP sensor meter"?

3. Is it possible to use this sensor with MSP432 microcontroller. It has 14-bit ADC and 0 to 3.3V can be applied to an ADC pin.

4. Life span of the sensor.

5. Is regular calibration required.

6.How long can it be kept in water.


Thanks
Ajit choudhury