Hach Sigma 1600, Инструкция по эксплуатации инструмента

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Page 28
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 = 2 mgd
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 = 1 cfs
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 =