The disclosure describes an apparatus including a substrate and a gas chromatograph having a fluid inlet and a fluid outlet and being mounted to the substrate. A detector array having a fluid inlet and a fluid outlet and is mounted to the substrate, and the fluid inlet of the detector array is fluidly coupled to the fluid outlet of the gas chromatograph. A control is circuit coupled to the gas chromatograph and to the detector array such that the control circuit can communicate with the gas chromatograph and to the detector array, and a readout circuit is coupled to the detector array and to the control circuit such that the readout circuit can communicate with the control circuit and the detector array. Other embodiments are disclosed and claimed.