The PI230 receiver was built by the MPIfR in Bonn. It was installed in 2015 and is mounted in the Nasmyth–B cabin of the telescope. The instrument is a collaboration between MPIfR and ESO and was replacing the SHeFI APEX-1 band.
It is a 230 GHz dual polarisation heterodyne system with 32 GHz bandwidth and 524,288 spectral channels. The receiver covers the spectral window of 195–270 GHz and uses a sideband-separating (2SB) type of mixer.
As of 2020, one of the polarisations is not available since 1 of the SIS mixers became part of nFLASH230. The instrument has been used by the EHT collaboration for the global mm VLBI campaigns.
See more in the ESO instrument page.