MODEL YB8 PROGRAMMING SECTION
April 1999/Manning Environmental Inc.
3DJH%
*09 Hydrologic Level Event Mode
(Storm Water Sampling)
The *09 mode is used primarily for Storm Water Sampling, although it can be used to sample in any situation
where t here are rising and falling levels. T he sampler is used in conjunction with an external device which
outputs an analog signal (4-20mA) representing level (for more details on how
the analog controller works, refer t o t he analog programming section o n page 2-12). T he sampler does not
ask fo r a definition o f t his level so ANY can be used, i.e. feet, meters, or inches. After the unit has been
programmed and started, it reads the analog signal once per minute to internally track the water level.
Sampling does not begin until the source water level reaches Sampling Level 1. Once this has occurred, a
sample is t aken and the Time Override for Sampling Level 1 begins counting down. A fter Sampling Level 1 is
reached, *09 Mode has 3 ways to trigger a sample:
1) When the analog signal corresponds to a Sampling Level.
2) The rise or fall o f t he water level by a user set amount (Rising or Falling Delta).
3) When the Time Override has elapsed if there has not been a large enough increase or decrease in water
level or another Sampling Level has not been reached.
If any of t hese o ccur, the sampler will advance t he spout, t ake a sample and deposit it in the first bottle. T he
sampler will continue t his pattern of depositing samples in each bottle, until the total number of bottles the unit
is configured for (set in *99) each have a sample placed in them or a bottle full condition occurs. If either of
the first t wo t riggering conditions is met (the analog signal corresponding to a Sampling Level o r a Rising o r
Falling Delta), the Time Override is reset, and begins counting down again. A different T ime Override can be
set for each level entered. Each Time Override is only active in that portion or range of the total span that
corresponds to it s Sampling Level. T ime Override 4 is active from t he start o f Sampling Level 4 to t he
beginning of Sampling Level 5.
The following entries are required. See figure 2-3 for an example.
Upper Level Limit Maximum Analog Level (hydrologic high point) 100% of span.
Lower Level Limit Minimum Analog level (hydrologic lo w point). 0 % o f span. T he difference
between the Upper Level Limit and the Lower Level Limit is the span.
Rising (positive) Rising change in water level, resulting in a sample. N OTE: T he user can enter only
Delta 1 Rising Delta for the duration of the program.
Falling (negative) Falling change in water level, resulting in a sample. N OTE: T he user can enter only
Delta 1 Falling Delta for t he duration of t he program.
Sampling Level 1 Water level at which the first sample will be taken, and which is associated with
Time Override 1.
Time Override 1 Time Override to the next sample in t he range. Causes a sample t o be t aken if t he
Rising o r Falling Delta, o r Sampling Level 2 has not been met within t he override
time. I t will reset after a sample is taken.
Sampling Level 2-6 Subsequent higher levels at which samples will be t aken.
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