We report on observations of Cen A using the SEST telescope (Swedish-ESO Submillimeter Telescope). In a previous paper (Eckart et al. 1990a, hereafter Paper I) we presented a fully sampled map of the 12CO(1-0) distribution in the disk which complements the 12CO(2-1) cuts obtained by Phillips et al. (1987, 1989). From these data we determined that the ISM in the disk of Centaurus A is cold (T<10 K), with densities of the order of the 12CO critical density (∼2 × 104 cm—3). Absorption against the nuclear continuum source has been reported for HI (van Gorkom 1987, van der Hulst et al. 1983, Whiteoak and Gardner 1971) and a number of molecular species, such as OH, H2CO, C3H2, 12CO, and 13CO (Whiteoak and Gardner 1971, Gardner and Whiteoak 1976, Bell and Seaquist 1988, Phillips et al. 1987, Israel et al. 1990). Here we summarize measurements of absorption in the lines of 12CO, 13CO, HCO+, HCN, CN and CS (see Eckart et al. 1990b; hereafter Paper II).