The calibration was completed at the Indonesian National Institute of Aeronautics and Space facilities in Bandung by an expert from International Ozone Services Inc. with support from the Vienna Convention Trust Fund through WMO. The instrument was installed in early 1995 and last visited in 2001, but had been out of service for the past four–five years. The instrument required a new power supply, microboard and ultraviolet filter in front of the photomultiplier tube to return it to service. The Indonesian National Institute of Aeronautics and Space supported the work.