Diagnostic system for monitoring internal conditions inside a fuel cell

A diagnostic system for monitoring internal conditions inside a fuel cell comprising:

• a pair of bipolar plates including a first bipolar plate and a second bipolar plate, a first fuel gas channel being disposed on said first bipolar plate, a second fuel gas channel being disposed on said second bipolar plate;
• a gas diffusion layer being disposed between said first fuel gas channel and said second fuel gas channel;
• a central controller having a computing unit and a display;
• at least three sensors contacting with one of said first fuel gas channel or said second fuel gas channel, each sensor including a resistor portion, a capacitor portion, a common lead, a resistor line, and a capacitor line, so as to detect a voltage value, a resistance value, and a capacity value;
• said computing unit being able to convert said voltage value into temperature information and to calculate said capacity value into humidity information at a location of said sensor;
• said computing unit also being able to output a flow velocity information based on three adjacent sensors;
• said common lead, said resistor line, and said capacitor line connecting with said central controller;
• said display of said central controller showing out physical information detected by said sensors so as to diagnose internal conditions inside a fuel cell;
• said physical information at least including voltage, resistance, capacity, temperature, humidity, flow velocity, and flow rate.