Rev: 01
P/N: 95343
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Selecting Stabilization Parameters
Select parameters for purging stabilization based on your site work plan or groundwater sampling & analysis
plan (GWSAP or SAP) and considering any regulatory guidance or requirements. Each parameter can be selected
individually. If the parameter is not displayed on the screen make sure it is enabled for measurement (See
section 3.5.3), as only the parameters that are selected for measurement can be used for stabilization. If the
parameter is shown on this screen but is not selected for stabilization, it will be displayed on the main screen
but will not be taken into account for stabilization.
Choosing Stabilization Criteria Range
The PurgeScan stabilization function indicates when the selected purging parameters have stabilized based on a
comparison of the current measured values with the two previous logged values, with all three values falling
within the range selected for each parameter (the stabilization criteria). The selection buttons next to each
parameter allow the user to either stabilize based on either a unit of measure or a percentage of the measured.
This can be different for each parameter but each parameter can only have one selection of either units or
percentage. The units or percentage that the user sets is generally based on the site specific work plan,
groundwater sampling & analysis plan (GWSAP or SAP) and considering any regulatory guidance or
requirements. When all of the selected parameters fall within the selected stabilization criteria, the system will
show “Stabilization Achieved” in green text in the status bar at the bottom of the main screen. The logged file
will also be annotated with the word “Stable” in the comments section.
Trending Function
At the bottom of the screen there is a toggle switch allow the user to either turn ON or OFF the trending
function. This optional function can be used to identify readings that are trending upward or downward to avoid
“false” or early indication of stabilization. If the values are trending and changing by 50% or more of the
stabilization criteria chosen, this function will prevent the software from indicating “Stabilization Achieved” even
though the reading values fall within the stabilization criteria selected. When trending stops and the values fall
within the desired stabilization range, the software will indicate stabilization on the screen and the PurgeScan
log will be annotated.
PurgeScan Logging Interval
The interval between logged readings can be user selected. This option is located at the top of the screen
notated
Interval
, with a drop down menu where the user can choose different preset times from 1-10 minutes in
1 minute increments.
3.6 Backup Logs
The Backup Logs are saved onto the sonde as a backup to the PurgeScan logs. This is in the case of the tablet or
PC being compromised and the user not being able to retrieve the logged data.