Hach SD900 - Time Based Collection; Use Variable Volume; Do Not Use Variable Volume; Flow Based Collection

Time based collection
1. Select or enter the values for each option.
Option Description
Pacing interval Collect samples at regular time intervals, in hours and minutes (0:01–999:00).
Take first sample The program starts immediately or after the first interval.
Variable volume Specify whether the sample volumes vary (flow based). If yes, refer to Use variable
volume on page 21. If no, refer to Do not use variable volume on page 21.
Use variable volume
Sample pacing is constant time variable volume (CTVV).
1. Select or enter the values for each option.
Option Description
Select unit Select the flow units to use.
Map 4 mA input Enter the flow rate that agrees with 4 mA input.
Map 20 mA input Enter the flow rate that agrees with 20 mA input.
Average flow rate Specify the average flow rate for the site (1–999,999). The units are specified by
the units selected above.
Time volume desired Specify the total volume to be collected during the sample program
(10–10,000 ml).
Collection period Specify the total collection period in hours and minutes (0:01–999:00).
Minimum sample volume If the flow volume is not sufficient to collect this minimum volume, the sample is
skipped (10–10,000 ml).
Do not use variable volume
1. Select or enter the values for the option.
Option Description
Take first sample Select whether the program starts immediately or after the first time interval has passed.
Flow based collection
Specify the flow source for flow based sampling:
• Counts—Refer to Use counts for the flow source on page 21.
• 4–20 mA input—Refer to Use 4–20 mA input for the flow source on page 22.
Use counts for the flow source
1. Select or enter the values for each option.
Option Description
Take sample every Collect samples at regular flow intervals, in counts (1–9999 counts).
Overrride time Collect a sample if the flow volume is very low.
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