Hach Sigma 950 Instrument Manual page 100

Programming Features
B.21 Stormwater
98
Analog Input Channel 1
Analog Input Channel 2
Analog Input Channel 3
Analog Input Channel 4
Analog Input Channel 5
Analog Input Channel 6
Analog Input Channel 7
To enable Set Point Sampling:
1. From the Main Menu, select
2. Highlight
SETPOINT SAMPLING
.
SELECT
3. Highlight the desired sampling trigger (see
4. Highlight either
SAMPLE ON HIGH CONDITION
5. Press
CHANGE CHOICE
Note: You must log rainfall to use set point sampling on a rainfall condition; likewise, you must log
flow in order to implement set point sampling on a flow rate of change. If you forget, you are
reminded when the program begins.
6. Enter the desired high or low trigger point using the numeric keypad, then press
.
ACCEPT
7. Enter a deadband value (see
for Flow Rate Of Change or Rainfall, enter a time interval within which the flow or
rainfall change must take place.
Sample on High Condition and Sample on Low Condition can be enabled at the same
time. There is no limit to the number of sampling triggers that can be enabled at one time.
A stormwater monitoring program designed specifically to meet the NPDES stormwater
requirements is built in to the Sigma 950 Flow Meter. Rainfall is monitored with an
optional Rain Gauge. A connection is then made from the flow meter Sampler Interface to
an automatic liquid sampler.
A typical stormwater program might be configured to activate when a storm causes a
level of at least 3 in. (7.6 cm) in the outfall channel and 0.10 in. (2.5 mm) of rainfall within
30 minutes. Or, it might be desirable to activate the program if either the rainfall occurs or
the channel level exceeds the limit. Any combination of rainfall and level conditions can
be used to activate a stormwater program. Specific requirements can vary, however, from
state to state. Consult state regulatory groups for recommendations on stormwater permit
requirements for specific applications.
1. To configure the Stormwater program in the flow meter, proceed as follows:
2. From the Main Menu, select
3. Highlight
STORM WATER
4. Press
CHANGE CHOICE
5. Select a Start Condition:
Table 39 Sampling Triggers
Sampling Trigger
OPTIONS> ADVANCED OPTIONS > SETPOINT SAMPLING.
using the
UP
Table
to enable or disable the sampling trigger for this condition.
Setting the Deadband on page
OPTIONS > ADVANCED OPTIONS > STORM WATER.
on the Advanced Options Menu, then press the
to enable Storm Water, then press
Settings
High and/or Low condition, deadband
High and/or Low condition, deadband
High and/or Low condition, deadband
High and/or Low condition, deadband
High and/or Low condition, deadband
High and/or Low condition, deadband
High and/or Low condition, deadband
and soft keys, then press
DOWN
39), then press
SELECT
or
SAMPLE ON LOW CONDITION.
90) or, if programming
.
ACCEPT
.
.
SELECT