LaMotte CORROSION CONTROL Test Kit User Manual
Page 6
INDEX CALCULATION CHART
Total Dissolved Solids
Calcium Hardness &
Total Alkalinity
Temperature
ppm = CF
ppm = AF
°C = TF
0
9.70
10
1.00
0.0
2.60
100
9.77
25
1.39
4.0
2.50
200
9.83
50
1.70
8.0
2.40
300
9.85
75
1.87
12.0
2.30
400
9.86
100
2.00
16.0
2.20
600
9.87
150
2.15
20.0
2.10
800
9.89
200
2.30
25.0
2.00
1000
9.90
300
2.48
30.0
1.90
400
2.60
40.0
1.70
800
2.90
50.0
1.55
1000
3.00
¾
¾
EXAMPLE:
A water sample was tested and found to have the following
characteristics:
Test
Measured
Value
Factor
Factor Value
from Chart
Temperature
10.0°C
TF (Temperature Factor)
2.35
Total Dissolved
Solids
300 ppm
TDSF (Total Dissolved
Solids Factor)
9.85
Calcium Hardness
75 ppm
CF (Calcium Hardness
Factor)
1.87
Total Alkalinity
100 ppm
AF (Alkalinity Factor)
2.00
pH
8.5
pH
8.5
CALCULATIONS:
Soluability pH (pHS) = TF + TDSF - CF - AF
pHS = 2.35 + 9.85 - 1.87 - 2.00
pHS = 8.33
Langelier Saturation Index (LSI) = Measured pH - pHS
LSI = 8.5 - 8.33
LSI = 0.17
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