Method for controlling sensor device

The invention relates to a method for controlling a sensor device for testing the volume of a sample gas, wherein a sample gas volume to be inspected is introduced into the measurement space. According to the invention, it is substantially provided that the volume fraction of the inspected sample gas volume is branched off from the sample gas outlet part by means of the gas-conducting connection and fed into the purification device, the volume fraction of the fed purification device being purified in the purification device and the purified volume fraction being fed into the measurement spaceas purified gas. Another aspect of the invention relates to a sensor device for checking the volume of a sample gas, the device comprises at least one measuring space, at least one sample gas input part and at least one sample gas output part. According to the invention, the at least one purified gas input part is provided to the measurement space, a ventilation unit is provided to a sample gas input part, a sample gas ou