In this work we studied the influence of pressure and temperature on the sorption of hydrogen in titanium plates using a constant volume system at low pressure. The system consisted of a stainless steel vacuum chamber with an electrically isolated titanium plate inside. Before each sorption experiment the plate was degassed by heating at 750 degrees C and 10(-6) mbar for several minutes. The pressure in the chamber for the hydrogen sorption was between 10(-1) and 10(3) mbar and the temperature in the titanium samples was between 10 and 750 degrees C. The results suggest that the amount of absorbed hydrogen in the plates depends on the quantity of hydrogen present in the system, the cleanliness and thermal degassing of the titanium. The degassing process results as the most important condition, because the samples degassed three times before being in contact with hydrogen absorbed rapidly this gas at room temperature. The titanium samples that were degassed just once absorbed hydrogen at the typical conditions of 600-700 degrees C.