DEVELOPMENT AND FIELD EVALUATION OF ISFET PH SENSOR INTEGRATED WITH SELF-CALIBRATION DEVICE FOR DEEP-SEA OCEANOGRAPHY APPLICATIONS

An ISFET (ion sensitive field effect transistor) based pH sensor integrated with a microfluidic device for sensor calibration has been developed and evaluated in this study. A PDMS microfluidic device is mounted on a commercially available pH ISFET to supply pH standard solutions during filed operations. As a result of the first real filed deployment of the device at deep-sea environment, drifting problem of pH ISFET was successfully compensated and reliable seawater pH value was obtained.