Campbell Scientific OBS-3+ and OBS300 Suspended Solids and Turbidity Monitors - Manual (Page 8)

Table of Contents
10. Maintenance .............................................................. 22
11. Factors that Affect Turbidity and Suspended-
Sediment Measurements ........................................ 23
11.1 Particle Size ....................................................................................... 23
11.2 Suspensions with Mud and Sand ....................................................... 24
11.3 Particle-Shape Effects ....................................................................... 24
11.4 High Sediment Concentrations .......................................................... 25
11.5 IR Reflectivity—Sediment Color ...................................................... 26
11.6 Water Color ....................................................................................... 27
11.7 Bubbles and Plankton ........................................................................ 27
11.8 Biological and Chemical Fouling ...................................................... 28
12. References ................................................................. 28
13. Terminology............................................................... 29
Appendices
A.
Importing Short Cut Code ...................................... A-1
A.1 Importing Short Cut Code into a Program Editor ............................ A-1
A.1.1 CRBasic Datalogger ................................................................. A-1
A.1.2 Edlog ........................................................................................ A-2
B. Example Programs .................................................. B-1
B.1 CRBasic Examples .......................................................................... B-1
B.1.1 CR1000 Example Program ....................................................... B-1
B.1.2 CR200(X) Example Program ................................................... B-2
B.2 Edlog Example ................................................................................ B-3
C. Electrical Connections Details ............................... C-1
D. Datalogger Connection to a Relay ......................... D-1
Figures
5-1. Components of the OBS-3+ (left) and orientation source beam
and detector acceptance cone of the OBS-3+ (top right) and
OBS300 (bottom right) .................................................................... 7
7-1. OBS-3+ connected to a CR1000 Datalogger (OBS300 has the
same wiring) .................................................................................. 11
7-2. Calibration certificate showing millivolt coefficients ....................... 13
7-3. Calibration certificate showing volts coefficients ............................. 14
8-1. Normalized response of OBS-3+ to AMCO Clear ® turbidity. The
inset shows the response function of an OBS sensor to high
sediment concentrations. ................................................................ 15
8-2. Position of OBS-3+ (left) and OBS300 (right) in clean tap water
in big black tub .............................................................................. 17
ii