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Sampler Programming Options
6507programming.fm
Section 3
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=2mgd
a = 1440 minutes
1. Calculate Q.
2. Calculate t.
3. Multiply Q x t.
Therefore, the value entered for INTV=____CNTS is 4.
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.
2. Calculate t.
3. Multiply Q x t.
Therefore, the value entered for INTV=____CNTS is 5.
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=1cfs
a = 2,880 minutes
1. Calculate Q.
2. Calculate t.
3. Multiply Q x t.
Therefore, the value entered for INTV=____CNTS is 24.
Q
Average Flow Rate
Maximum Flow Rate
------------------------------------------------------
0.52 mgd
2.0 mgd
------------------------ - 0.26 mgd===
t
a
n
---
1440 min
96 samples
------------------------------ - 15 min/sample== =
0.26 mgd 15 min/sample× 3.9=
Q
Average Flow Rate
Maximum Flow Rate
------------------------------------------------------
70 gpm
210 gpm
----------------------- 0.33 gpm===
t
a
n
---
480 min
32 samples
------------------------------ - 15 min/sample== =
0.33 mgd 15 min/sample× 4.95=
Q
Average Flow Rate
Maximum Flow Rate
------------------------------------------------------
0.25 cfs
1 cfs
-------------------- - 0.25 cfs===
t
a
n
---
2,880 min
30 samples
------------------------------ - 96 min/sample== =
0.25 cfs 96 min/sample× 24=
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