Hach-Lange SIGMA SD900 Refrigerated Sampler and All Weather Refrigerated Sampler User Manual - Manual (Page 72)

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Advanced sampling
Choose either the START ON SETPT or the START/STOP option.
If the START ON SETPT option is chosen, once a setpoint trigger is
active, the sampling program will begin running continuously and
stop when the program expires.
If the START/STOP option is chosen, once a setpoint trigger is
active, the program will begin running and stop when the trigger is
cleared.
Enter a setpoint delay if desired. The delay time begins when the
setpoint trigger becomes active. The program will begin running
when the delay time expires.
Note: Setpoint control and delay options are global settings applied to all
triggers.
5.3.4 Set multiple start and stop times
The start/stop time option creates an intermittent sampling
schedule. The program begins sampling at the first start time and
continues until the first stop time. Up to 12 start and 12 stop times
can be specified.
Procedure:
1. Select PROGRAM SETUP > MODIFY SELECTED > ADV SAMPLING
from the main menu.
2. Select STRT/STOP TIME > ENABLE .
3. If the sample program is configured for multiple bottles, select
ENABLE to start sampling at bottle 1 when each start time is
reached. Select DISABLE to continue the distribution sequence
from the last stop time.
4. Enter the time (24 hour) and date for the first start time.
5. Enter the time (24 hour) and date for the first stop time.
6. Repeat steps 4 and 5 until all start and stop times have
been entered.
5.3.5 Collect first flush stormwater samples
The stormwater option collects first flush (FF) samples or initial
runoff during storm conditions when pollutants are typically at a
high concentration. The first flush samples are collected at timed
intervals and can be initiated by an external device. A stormwater
program can run at the same time as the main program. The
stormwater option has the following capabilities:
• Collection of grab samples at up to 24 different time intervals.
First flush and main program flow-weighted composite samples
are automatically segregated. The first flush sample volume
may be set independently of the sample volume for the
flow-weighted composite.
• Initiation by an external device. A dry contact closure across
pins B and D on the auxiliary connector, held closed for at least
61 seconds, is required.
• When sampling with multiple bottles, the sampler can be
programmed to collect one large “first flush” sample (or small