Instrument will be taking measurements every second covering an area of approximately 2600km wide and 7km long in a resolution of 7x7km. Light will be separated into a different wavelengths using grating spectrometers and then measured with four different detectors for respective spectral bands. UV spectrometer is going to work in spectral range of 270-320nm, visible light spectrometer in 310-500nm, NIR in 675-775nm and SWIR in 2305-2385nm.
Instrument is split into four major blocks: UV-VIS-NIR spectrometers and a calibration block, SWIR spectrometer with its optics, instrument control unit and a cooling block. Total mass of Tropomi will be 200kg with a power consumption of 170W on average and a data output of 140 Gbits per orbit.
First large contract for Sentinel-5P was signed in July 2009 for Tropomi instrument between the European Space Agency and Dutch Ministry of Economic Affairs which contributed €78 million. On 8 December 2011 ESA selected Astrium UK as a prime contractor for the satellite, signing contract worth €45.5 million Construction of the satellite itself was completed in May 2014, however it still awaits for its primary instrument.