Campbell Scientific OBS500 Smart Turbidity Meter with ClearSensor Technology - Manual (Page 9)

Table of Contents
7-3. Settings Editor screen ......................................................................... 16
7-4. Terminal Emulator ............................................................................. 21
7-5. Normalized response of OBS500 to AMCO Clear ® turbidity.
The inset shows the response function of a turbidity sensor to
high-sediment concentrations. ........................................................ 23
7-6. Position of OBS500 in clean tap water in big black tub ..................... 25
7-7. OBS500 in 500-TU AMCO Clear ® turbidity standard in 100-mm
black polyethylene calibration cup ................................................. 26
7-8. Portable Sediment Suspender (left) and OBS beam orientation in
suspender tub (right) ....................................................................... 28
7-9. Remove the screw .............................................................................. 31
7-10. Insert screwdriver and rotate clockwise ............................................. 32
7-11. Shutter disassembled .......................................................................... 32
7-12. Shutter components ............................................................................ 32
8-1. Normalized sensitivity as a function of grain diameter ...................... 33
8-2. The apparent change in turbidity resulting from disaggregation
methods .......................................................................................... 34
8-3. Relative scattering intensities of grain shapes .................................... 35
8-4. Response of an OBS sensor to a wide range of SSC .......................... 36
8-5. Infrared reflectivity of minerals as a function of 10-Munzell Value .. 37
9-1. DevConfig, Send OS .......................................................................... 39
Tables
7-1. Factory Settings .................................................................................. 13
7-2. RS-232 Terminal Commands ............................................................. 15
7-3. OBS500 Connector Pin-Out ............................................................... 17
7-4. SDI-12 Wiring .................................................................................... 17
7-5. RS-232 Wiring ................................................................................... 18
7-6. Analog 0-5 Volt Wiring ..................................................................... 18
7-7. SDI-12 and RS-232 Measurement Commands .................................. 19
7-8. RS-232 Settings .................................................................................. 22
7-9. Calibration Materials and Volumes .................................................... 24
7-10. Change in TU value resulting from one hour of evaporation of
SDVB standard, i.e., loss of water but not particles. ...................... 25
10-1. Troubleshooting Chart. ...................................................................... 40
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