Hach-Lange SD900 Refrigerated Sampler, SD900 AWRS User Manual - Manual (Page 35)

Figure 14 High setpoint example
1 Channel value 3 Setpoint trigger off 5 Setpoint value
2 Setpoint trigger on 4 Deadband 6 Scan intervals
Set multiple start and stop times
A sampling schedule can be set up to start sampling at a specified start time and stop at a specified
stop time. Up to twelve start and stop times can be specified.
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 the distribution option.
Option Description
ENABLE Put the first sample in bottle 1 at each start time.
DISABLE Continue the distribution sequence from the last stop time.
4. Enter the time (24-hour format) and date for the first start time.
5. Enter the time (24-hour format) and date for the first stop time.
6. Continue to add start and stop times as necessary.
Collect first flush stormwater samples
The stormwater option collects first flush (FF) samples or initial runoff during storm conditions when
pollutants are typically at high concentrations. The first flush samples are collected at timed intervals
and can be started by an external device. A stormwater program can operate at the same time as the
main program. First flush samples are usually collected within 30 minutes of a storm. The stormwater
program has these capabilities:
• Collect 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 necessary.
• For multiple bottles, the sampler can be programmed to collect one large “first flush” sample (or
small multiple samples) at timed interval(s). The number of bottles segregated for the first flush
sample is selectable. Concurrently, flow-weighted samples are collected from the beginning of the
storm until all remaining bottle(s) are filled, or after a specified time has elapsed.
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