Campbell Scientific OBS-3A Turbidity and Temperature Monitoring System - Manual (Page 6)

Table of Contents
6.13 Excel Spreadsheets ............................................................................ 41
6.14 Erasing Memory Data........................................................................ 42
7. Calibration .................................................................43
7.1 Turbidity............................................................................................ 43
7.1.1 Equipment and Materials............................................................ 43
7.1.2 Preparation ................................................................................. 44
7.1.3 HydroSci Software Steps............................................................ 44
7.1.4 Making Turbidity Standards....................................................... 45
7.2 Sediment............................................................................................ 46
7.2.1 Equipment and Materials............................................................ 47
7.2.2 Sediment Preparation ................................................................. 47
7.3 Salinity, Pressure and Temperature Calibrations............................... 49
8. Troubleshooting........................................................49
9. Maintenance ..............................................................53
9.1 OBS Sensor ....................................................................................... 53
9.2 Pressure Sensor.................................................................................. 53
9.3 Conductivity Sensor .......................................................................... 53
9.4 Batteries............................................................................................. 54
9.5 Pressure Housing............................................................................... 55
9.6 Antifoulant Coatings ......................................................................... 55
9.7 User-serviceable Parts ....................................................................... 55
10. Factors Affecting OBS Response............................55
10.1 Particle Size....................................................................................... 56
10.2 Suspensions with Mud and Sand ....................................................... 57
10.3 High Sediment Concentrations.......................................................... 58
10.4 Sediment Color.................................................................................. 59
10.5 Water Color ....................................................................................... 59
10.6 Bubbles.............................................................................................. 60
10.7 Biological and Chemical Fouling ...................................................... 61
11. References.................................................................61
Figures
4-1. Anatomy of an OBS sensor ................................................................. 3
4-2. Optical particle detectors..................................................................... 3
5-1. Dimensions.......................................................................................... 6
6-1. Components......................................................................................... 8
6-2. Battery installation .............................................................................. 9
6-3. Connections and wiring of field cable............................................... 10
7-1. Effects of disaggregation................................................................... 48
8-1. Component locations......................................................................... 50
10-1. Response to sand, silt and clay .......................................................... 56
10-2. Effects of particle size ....................................................................... 57
10-3. Response at high sediment concentrations ........................................ 58
10-4. IR reflectance of minerals ................................................................. 59
10-5. Scattering intensity vs. angle............................................................. 60
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