Hach 900 MAX, Instrument Manual

Page: 60 / 160

Page 58
Advanced Sampling
8990startup.fm
Section 3
17-D. Enable or Disable Continuous Mode using the
CHANGE CHOICE
key. If
Continuous Mode is enabled the program will continuously run and
switch bottle sets after every specified duration elapses, until manually
stopped. If Continuous Mode is disabled, then the sampling halts when
the last bottle set in the tray is full.
17-E. Press
ACCEPT
to continue to Upset Sample.
Step 18 - Upset Sample
Upset Sampling analyzes the collected samples to determine when samples
meet or exceed specified upset limits. The sampler will swing the distributor
arm around to a sequestered set of bottles and grab an upset bottle.
The upset sample bottles are always the last bottles in the tray. For example, if
there are 24 bottles in the tray, 4 first flush bottles and 4 upset bottles, then the
bottles assignment is 1–4 first flush, 5–20 main program, and 21–24
upset samples.
Note: Unlike Setpoint Sampling,
Upset Sampling can be enabled
while the sampler is performing its
regular sampling program. There
must be more than one bottle in the
sampler to perform Upset Sampling.
Upset Samples are collected even when there are no more regular samples to
be taken; when the status screen says Program Complete, but the bottom line
of the display says Program Running.
Refer to the Quick Start Guides on page 103 for more setup information for
individual channels.
18-A. Highlight Upset Sampling using the
UP
and
DOWN
keys on the
Advanced Sampling Menu. Press
SELECT
to continue.
18-B. Enable or Disable Upset Sampling using the
CHANGE CHOICE
key.
Press
ACCEPT
to continue.
18-C. Press
CHANGE CHOICE
to select the desired channel to trigger from.
Press
ACCEPT
to make the selection.
18-D. Press either
HIGH CONDITION
or
LOW CONDITION
.
• Flow Rate of Change and Rainfall are signals that only increase in
value and do not require Low Condition.
• The external control signal (such as an external flow meter) must be
configured in the external equipment for the desired setpoint.
11:00 AM 21 - APR - 01 ADVANCED SAMPLING
SELECT
START/STOP TIMES
STORM WATER
TIMED BOTTLE SETS
UPSET SAMPLING
RETURN
VARIABLE INTERVALS
VARIABLE VOLUME
11:00 AM 21 - APR - 01 UPSET SAMPLES
UPSET CONDITION:
HIGH
CONDITION
LOW
CONDITION