User manual

Table Of Contents
Additional Notes
This section provides some additional notes that apply to both the Sea-Bird 41CP and
52MP CTD sensors.
NOTE
For more in-depth information about these sensors, refer to the Sea-Bird Electronics website
(www.seabird.com) or contact Sea-Bird.
IMPORTANT
Consult Sea-Bird before disassembling any of the CTD electrical or mechanical components.
Remove the three protective caps (the red plastic cap covers the water intake port
and two translucent caps cover the T-shaped water outlet) before operating the
CTD in water. The caps protect the cell from contamination by airborne
particulates that could coat the cell walls and change sensor calibration.
The red cap is attached to a TC Duct which ensures that the water sensed by the
temperature sensor is the same water that passes through the cell. The effect
optimizes the coordination of the T and C measurements so that salinity and
density can be correctly determined.
Test the CTD sensors with a closed loop of tubing connecting the intake and
exhaust ports.
Sensor orientation is important. The 41CP should be mounted with the sensor
pointing upward to ensure that the U-shaped water path can fill with water when
deployed. The 52MP should be mounted and oriented so that the intake and
exhaust are on the same horizontal plane.
Flush the cell before and after deployment with a dilute solution of Triton X-100
(approximately 1 part Triton to 50 parts deionized water) to help keep the cell
clean and facilitate wetting of the conductivity cell electrodes.
Appendix L-
5