Hach Sigma 1600 Instrument Manual page 28

Section 3
Page 28
Sampler Programming Options
Example 3: You want to collect 96 samples over a 24-hour period on a 4–20
mA flow proportional basis.
Average Flow Rate = 0.52 mgd (average flow rate over the 24-hour period)
Maximum Flow Rate = 2 mgd
a = 1440 minutes
1. Calculate Q.
Average Flow Rate
Q = ----------------------------------------------------- -
Maximum Flow Rate
2. Calculate t.
a 1440 min
t = -- - = ------------------------------ - =
n 96 samples
3. Multiply Q x t.
×
0.26 mgd 15 min/sample
Therefore, the value entered for
Example 4: You want to collect 32 samples over an 8-hour period.
Average Flow Rate = 70 gpm (average flow rate over the 8-hour period)
Maximum Flow Rate = 210 gpm
a = 480 minutes
1. Calculate Q.
Average Flow Rate
Q = ----------------------------------------------------- -
Maximum Flow Rate
2. Calculate t.
a 480 min
t = -- - = ------------------------------ - =
n 32 samples
3. Multiply Q x t.
×
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.
×
0.25 cfs 96 min/sample
Therefore, the value entered for
0.52 mgd
= ------------------------ - = 0.26 mgd
2.0 mgd
15 min/sample
= 3.9
INTV = _ _ _ _ CNTS
70 gpm
= ---------------------- - = 0.33 gpm
210 gpm
15 min/sample
4.95
=
INTV = _ _ _ _ CNTS
0.25 cfs
= -------------------- - = 0.25 cfs
1 cfs
96 min/sample
= 24
INTV = _ _ _ _ CNTS
is 4.
is 5.
is 24.
6507programming.fm