 The light produced by traversing particles in the plastic scintillator bars and planes is collected by wavelength-shifting fibres and detected by Hamamatsu Multi-pixel photon counters located at one or both ends of the fibres.Scintillator bars are organised into layers, where bars in two neighbouring layers are perpendicular to each other providing together 3D information about traversing particles.The main purpose of the INGRID detector is the monitoring of the direction and intensity of the beam on a daily basis by direct detection of neutrino interactions.