Hach 900 MAX User Manual
Page 57
Section 3
Page 55
8990startup.fm
Advanced Sampling
•
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
UP
and
DOWN
keys on the Advanced
Sampling Menu. Press
SELECT
to continue.
16-B. Enable or Disable Storm Water using the
CHANGE CHOICE
key. Press
ACCEPT
to continue.
16-C. Select a Start Condition using the
CHANGE CHOICE
key.
•
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
RUN
key is pressed, a start
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.
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.
11:00 AM 21 - APR - 01
ADVANCED SAMPLING
SELECT
SETPOINT SAMPLING
SPECIAL PUTPUT
START/STOP TIMES
STORM WATER
RETURN
TIMED BOTTLE SETS
UPSET SAMPLE
Table 4 Start Condition Requirements
Rain
Enter the amount of rainfall and the time period when it must fall.
Level
Level Limit
Rain and Level
Enter the amount of rainfall and the time period when it must fall, and desired level limit.
Immediate
No start condition required
External Trigger
No start condition required