Hach Sigma 900 User Manual page 54

Section 5
Page 54
Flow Proportional Operation
3. Multiply Q x t x 10.
×
0.33 mgd 15 min/sample
Therefore, the value entered for
Example 5
It is desired to collect 30 samples over a 2-day period.
Average Flow Rate = 0.25 cfs (average flow rate over the 48-hour period)
Maximum Flow Rate = 1 cfs
a = 2,880 minutes
1. Calculate Q.
Average Flow Rate
Q = ----------------------------------------------------- -
Maximum Flow Rate
2. Calculate t.
a 2,880 min
t = -- - = ------------------------------ - =
n 30 samples
3. Multiply Q x t x 10.
×
0.25 cfs 96 min/sample
Therefore, the value entered for
You will notice from the previous five examples that the average and
maximum flow rate can be expressed in any units, i.e. mgd, gpm, cfs, etc.
However, express the average and maximum flow rate in the same units for
any given situation.
×
10 49.5
=
INTV = _ _ _ _ CNTS
0.25 cfs
= -------------------- - = 0.25 cfs
1 cfs
96 min/sample
×
10 = 240
INTV = _ _ _ _ CNTS
is 50.
is 240.
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