Hach 900 MAX Instrument Manual page 57

Rain
Level
Rain and Level
Immediate
External Trigger
8990startup.fm
• Storm water samplers are equipped with a special prerinse that occurs
only with the first sample collection. This "one time only" rinse ensures a
clean intake for installations that may remain dormant for extended
periods, and extends battery life by eliminating the prerinse for
subsequent samples.
16-A. Highlight Storm Water using the
Sampling Menu. Press
11:00 AM 21 - APR - 01
SETPOINT SAMPLING
SPECIAL PUTPUT
SELECT
START/STOP TIMES
STORM WATER
TIMED BOTTLE SETS
UPSET SAMPLE
RETURN
16-B. Enable or Disable Storm Water using the
to continue.
ACCEPT
16-C. Select a Start Condition using the
• Rain
• Level
• Rain or Level (either conditions must be met for the program to begin)
• Rain and Level (both conditions must be met for the program
to begin)
• Immediate (program starts as soon as the
condition is not required)
• External Trigger (program starts when signaled by an external device
at least 61 seconds through the Auxiliary connector. No start
condition is required).
16-D. Enter the Start Condition Limits. Rainfall times will depend on the
historical rainfall in a specific area. Consult your state or an EPA
regional office for details.
Table 4 Start Condition Requirements
Enter the amount of rainfall and the time period when it must fall.
Level Limit
Enter the amount of rainfall and the time period when it must fall, and desired level limit.
No start condition required
No start condition required
First Flush Bottles
First flush describes the initial storm water runoff. This runoff may contain
higher concentrations of pollutants and is sequestered in separate bottles
from the flow or time-weighted composite samples.
a. Enter the number of bottles to set aside for the First Flush portion of
the sampling program using the numeric keypad.
and keys on the Advanced
UP DOWN
to continue.
SELECT
ADVANCED SAMPLING
CHANGE CHOICE
CHANGE CHOICE
key is pressed, a start
RUN
Section 3
key. Press
key.
Page 55
Advanced Sampling