Patent ID: 8479598

Claim:
A sonde comprising a side wall, a first end wall at a first end of the side wall, a second end wall at a second end of the side wall, a plurality of first sensors mounted in the first end wall, a plurality of second sensors mounted in the side wall, and the sonde being such that: (i) the first sensors extend longitudinally of the sonde; (ii) the first sensors are positioned radially around a longitudinal axis of the sonde; (iii) the first sensors are water quality sensors; (iv) the second sensors extend radially outwardly from the longitudinal axis of the sonde; (v) the sonde has a body which comprises the side wall, the first end wall and the second end wall; (vi) the body is constructed from at least three separately formed plastics disc-shaped components which are connected together by a threaded housing which extends inside the plastics disc-shaped components, which extends along the longitudinal axis of the sonde, and which has parts which screw together to cause the threaded housing to tighten against the plastics disc-shaped components and thereby connect the plastics disc-shaped components together; and (vii) the sonde includes an optical sensing arrangement mounted in an optical cavity in the side wall.