Patent ID: 8054081

Claim:
A residual gas analyzer comprising: a sensor unit including a sensor part for measuring a residual gas in an equipment or a residual gas from the equipment, the equipment having a chamber; and a device main body provided with an operating part for receiving an operation for controlling the sensor part, a residual gas analysis processing part for performing analysis processing of the measured residual gas on a basis of an output of the sensor part, and an analysis processing result screen display part for displaying on a screen a result of the analysis processing in the residual gas analysis processing part, wherein: the device main body has a mounting surface for mounting the sensor unit; in a mounted status where the sensor unit is mounted on the mounting surface, the device main body controls the sensor part to perform the analysis processing of the measured residual gas; and in a removed status where the sensor unit is removed from the mounting surface, the device main body controls the sensor part to perform the analysis processing of the measured residual gas.