TomGeorge:
Hi.http://www.uib.es/depart/dfs/GTE/staff/jfont/InstrETT/lm335Z.pdf
Please read it and then connect the sensor up the correct way with a series resistor on page 6/11.
You do not connect it across the supply and get volts/DegC out.Tom..................
Please Tom, if you could, could you please describe in more detail on how to do it? It's my first time using electronic circuits. What is an R1?