1. effects of disaggregation, 2. sample durations for sediment calibrations – Campbell Scientific OBS-3A Turbidity and Temperature Monitoring System User Manual
Page 56
OBS-3A Turbidity and Temperature Monitoring System
10
20
30
40
50
Sediment Concentration (mg/l)
0
10
20
30
40
50
60
T
u
rb
id
ity
(NT
U
)
Hand Shaking
15-min. Sonic Bath
3-min. Sonic Probe
FIGURE 7-1. Effects of disaggregation
Preparation
1. Clean containers and glassware with detergent and rinse with filtered
water.
2. Perform the calibration under fluorescent lighting.
3. Based on the material, select the appropriate sample duration from TABLE
TABLE 7-2. Sample Durations for
Sediment Calibrations
Sediment Seconds
Clay 10
Silt 20
Fine Sand
40
4. Open the calibration the screen under OBS-3A Configuration |
Operation | Calibration | Calibrate and select mg/L.
5. Enter sediment concentration values.
6. After each addition of sediment, compute mg/L or ppm with the equations
given below.
48
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