Finally we have received a working PTR rotary valve from Iwatani, Japan, through Kelvin International, USA. We had to send back our working unit for documentation and back-engineering. This was done in mid November and by the 19th of December the new upgraded unit arrived at the NOT and was immediately mounted on NOTCam. Apart from one incident of strange sounds from the unit, it has worked flawlessly since arrival. An extra back-up valve was supplied free of charge to compensate for the long time this has taken.

Thomas Augusteijn 2008-11-14