A temperature sensor is located between the 3-pin and 6-pin
connectors. In the center of the endcap is an LED that blinks when the
instrument is sampling. The stainless steel fitting with small tube is the
port for the depth sensor. This fitting can be removed to allow the port
to be cleaned should sediment or salt deposit build up.
Also on the Connector endcap is a white plastic lever. This
mechanical lever has a strong magnet embedded in the plastic. This
magnet can be used to trigger a digital switch inside the instrument
which can be programmed to start and stop the LISST-200X sampling.
The final item on the endcap is the zinc anode. The sacrificial zinc
anode protects the instrument from corrosion during long periods of
time in salt water.
At this time, check the optical windows to make sure that they are
clean. There are two windows: The receive window (or large window)
and the transmit window (or small window). Both window need to be
very clean in order to get good measurements.
The best way to check the windows is by using a flashlight. By shining
light from one side and viewing from the other the surface of the
windows can be easily checked for cleanliness.