  We present SO and SO2 observations in the region of the low mass protostar
IRAS2/NGC1333. The East-West outflow originating from this source has been
mapped in four transitions of both SO and SO2. In addition, CS observations
published in the literature have been used. We compute the SO, SO2 and CS
column densities and the physical conditions at several positions of the
outflow using LTE and a non-LTE LVG approximations. The SO2/SO and CS/SO
abundance ratios are compared with the theoretical predictions of a chemical
model adapted to the physical conditions in the IRAS2 outflow. The SO2/SO
abundance ratios are constant in the two lobes of the outflow whereas CS/SO is
up to 6 times lower in the shocked gas of the East lobe than in the West one.
The comparison with the chemical model allows us to constrain the age of the
outflow produced by IRAS2 to >5e3yr. We find low densities and temperatures for
the outflow of IRAS2 (< 1e6 cm-3 and >70 K) from SO and SO2 emission probably
because the two molecules trace the cooled entrained material. The East lobe of
the outflow shows denser gas compared to the West lobe. We also discuss some
constraints on the depleted form of sulphur.
