A broad set of information on ISOPHOT and its interactive analysis system
is available on the instrument web page:
http://www.cosmos.esa.int/web/iso/ 
ISO Explanatory Library
PHT
Information on the ISO satellite and its pointing modes is available
under:
http://www.cosmos.esa.int/web/iso/ ISO Explanatory Library
ISO Satellite
In addition you may contact us via
the ISO helpdesk:
https://support.cosmos.esa.int/iso