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TABLE 7-1. Schedule of Concentrations for Sediment Calibrations
MUD (D
Low
SSC
(0-5 g/l)
0.0
1.0
1.5
2.0
2.5
3.0
3.5
4.0
The operator can control the electronic gain of the detector circuits to optimize
the instrument for his sediment. This can be done with the ND Gain and FD
Gain boxes in the OBS-5+ program during the calibration using the + and –
buttons to toggle gain up or down. The unit automatically scales all calibration
counts to match the selected gain. Set the initial ND and FD gain values to 16,
starting with the third SSC value in TABLE 7-2, adjust the gain to keep the ND
and FD counts in the range of 50,000 to 60,000.
CAUTION
While calibration points can be deleted at any time, never
start a new SSC value until you are satisfied with the
current values and gain setting.
The FD counts will peak first at around 2 to 7 g L
between 5 to 20 g L
calibration in cells D1 and E1 (default volume and density are 3.0 l and
–1
2,650 g L
added to column A and read the current SSC value in column C.
TABLE 7-2. SSC-Calculation Spreadsheet
A
Grams
Added
1
0.00
2
1.00
2
2.00
3
3.00
4
4.00
< 62 µm)
60
Mid-
High
range
SSC
(5-20 g/l)
(> 20 g/l)
5
25
6
30
7
40
8
50
9
60
10
15
20
–1
. Set the water volume and sediment density for your
). Every time sediment is added to the suspender, enter the grams
B
C
D
Total
Cs (g/l)
Water
Grams
(g/l)
Volume (l)
0.00
0.00
3.0
1.00
0.33
3.00
1.00
6.00
2.00
10.00
3.33
OBS-5+ System
Sand (D
> 62 µm)
60
Low
Mid-
SSC
range
(0-10 g/l)
(10-40 g/l)
(> 49 g/l)
0.0
12
2.0
14
3.0
15
4.0
20
5.0
25
6.0
30
8.0
35
10.0
40
–1
and the ND will peak
E
Sediment
Density (g/l)
2650
High
SSC
50
60
70
80
90
100
140
160
23
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