SUP-pH-5013A / SUPMEA เซ็นเซอร์วัดค่าพีเอช PH SENSOR Applications: SUP-pH-5013A pH sensor used in PH measurement is also called primary cell. The primary battery is a system whose function is to convert chemical energy into electrical energy. The voltage of this battery is called electromotive force (EMF). This electromotive force (EMF) consists of two half-cells.