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6712SR Refrigerated Sampler
Section 5 Extended Programming
5-19
5.11 Flow Proportional
Sample Volumes
The 6712 can collect flow proportional sample volumes. For some
sampling protocols, these flow-weighted, variable-volume
samples can be more representative of the stream. This is
because stream characteristics often change as the flow fluc-
tuates.
Variable-volume sampling is possible when the sampler is pro-
grammed for Uniform Time pacing. To enable this feature, select
YES at the display asking “DO YOU WANT SAMPLE
VOLUMES DEPENDENT ON FLOW?”
After answering YES, the sampler displays screens to program
the flow proportional volumes. If the sampler has a 700 Series
Flow Module inserted, you will be asked which flow mea-
surement should be used to determine the volumes.
To base the volumes on an external flow measurement device
attached to the Flow Meter connector, select FLOW PULSES. To
base the volumes on the 700 Series Flow Module readings, select
FLOW MODULE VOLUME.
Next, the sampler asks for the SAMPLE VOLUME to collect at
each time interval. This volume is expressed as 10 ml for every X
number of pulses, or if using a flow module, for every volume
unit.
Refer to section 5.11.1, Calculating Variable Sample Volume Set-
tings, for a more detailed discussion on this setting.
The final screen used to program variable-volume sampling is
the MINIMUM SAMPLE VOLUME. If the number of flow pulses
or flow module volume is not sufficient enough to collect this
minimum volume, the sample is skipped and the flow count
carries over to the next sample time. This setting ranges from
10 ml to a maximum determined by the bottle volume.
DO YOU WANT
SAMPLE VOLUMES
DEPENDENT ON FLOW?
YES
NO
FLOW PULSES
FLOW MODULE VOLUME
SAMPLE VOLUME:
10 ml FOR EVERY
___
PULSES
MINIMUM
SAMPLE VOLUME
___
ml
(10 - maximum)