RKI Instruments RX-517 - Manual (Page 35)

PT0E-0730
34
１１−３．ELECTRO-CHEMICAL CELL method
This gas detector applies an electrochemical sensor. The sample gas is electrolyzed by the
electrolyzed cell added with specific electric potential (bias voltage) and detected from the
electrolyzed current generated at that time.
The electrochemical sensor is designed to keep the interface between electrode and electrolyte
at a constant potential (Bias voltage) and is the method to electrolyze gas directly. Then as
the gas has the bias voltage generating its own electrolization (Rrdox reaction) the bias voltage
of sensor is determined by the redox potential.
32
電解液
Ｒ（抵抗）
参照電極
対極
作用電極
気体透過膜
Gas in
Gas out
構造図
ポテンショスタット回路 PS circuit
RE
CE
GPF
WE
Figure
Solution