CTD-N Technical Manual
P/N 95F-6000-00 (February 2017)
page 95
EAR-Controlled Technology Subject to Restrictions Contained on the Cover Page.
Seapoint Turbidity Sensor
The turbidity sensor is a Seapoint Turbidity Meter manufactured by Seapoint Sensors, Inc. The sen-
sor detects the light scattered by suspended particles in water and outputs a voltage proportional to
the amount of suspended solids. The turbidity sensor is shown connected to the Options 1 con-
nector on a CTD-N in Figure 51.
The turbidity sensor has four range selections which allow you to choose the best resolution for
measuring clean to very turbid water. You can select the range in CTDPro by choosing the corre-
sponding gain in accordance with Table 14. CTDPro also allows you calibrate the sensor by immers-
ing it in several known standards.
For more information about the turbidity sensor, refer to the Seapoint Turbidity Meter user manual
provided with the option.
Table 14:
Seapoint Turbidity Sensor Range Selections
Gain
Resolution
Range
1X
2 mV/FTU
<750 FTU
5X
10 mV/FTU
500 FTU
20X
400 mV/FTU
125 FTU
100X
200 mV/FTU
25 FTU
Selecting the Range for the Seapoint Turbidity Sensor
To select the range for the turbidity sensor:
1. Connect the CTD-N to your computer.
2. Choose Start
➤
All Programs
➤
RD Instruments
➤
CTDPro.
CTDPro starts and the CTDPro Main window opens.