A compressor comprises a housing defining an inlet, a volute, an outlet, and a compressor chamber between the inlet and the outlet within which a compressor wheel is rotatably mounted. The housing has discrete attached first and second housing portions, the first housing portion defining at least part of the inlet and the second housing portion defining at least part of a volute of the outlet. The first housing portion has a conductive element for conducting an electric signal and a second sensor arrangement in sensing communication with the inlet. The compressor further comprises a first sensor arrangement, the first sensor arrangement being configured such that it is in sensing communication with the volute or outlet and such that it is electrically connected to the conductive element.