Ngk Insulators, Inc.

Masao Kon

Takao Murase

Jun Usami

A gas analyzer monitors concentration of discharged NOx even if an air ratio X is less than 1. The gas analyzer has three internal spaces and four electro-chemical pumps. The first space effects combustion of combustible gases and has a first pump to adjust oxygen partial pressure. The second space has a second pump to decrease oxygen partial pressure. The third space has a third electro-chemical pump to control oxygen partial pressure and a fourth pump to draw out oxygen generated when object gas is reduced or decomposed. An air introducing duct is provided so the outside pump electrodes of the first and second pumps are isolated and not directly exposed to object gas. This duct serves as oxygen source when oxygen is introduced into the first space. The gas analyzer has an operating section for operating the pumps, a calculating section, and a displaying/outputting section. A calibrating method is disclosed also.

Gas analyzer and method of calibrating the same

A gas analyzer includes a gas sensor, a drive section that pumps oxygen in first to third processing zones of the gas sensor, an operating section that operates a pumping current flowing in a third electro-chemical pump cell into a gas value to be measured, a display output section that displays a value operated by the operating section, or outputs the value as an electrical output to the external, and a heater drive section that heats the gas sensor to a predetermined temperature.

Growing community of inventors

Nagoya, Japan

Masao Kon