In-Situ TROLL 9500 Operators Manual - Manual (Page 140)

135
Multi-Parameter
Water Quality TROLL ®
TROLL 9500 Operator’s Manual 0095110 rev. 007 01/09
20 LOW -FLOW MONITORING
Groundwater that has sat in a well casing for a period of time may not
adequately represent the formation water. Well purging can ensure
that fresh formation water is drawn into the casing for representa-
tive measurement of water temperature, pH, conductivity, and other
parameters. The well may be pumped to remove a predetermined
number of volumes of stagnant water from the well.
A more cost- and time-effective method of purging involves pumping
at very low flow rates with concurrent monitoring of water quality indi-
cator parameters until it is determined that true formation water is be-
ing monitored. The Flow-Sense Wizard in Win-Situ 4 and Pocket-Situ
4 automates this process to help determine when a representative
sample of formation water can be collected from a well for analy-
sis. Based on user input, the software calculates the volume of the
In-Situ flow cell and tubing, and the time to exchange one complete
volume at the specified pumping rate. The frequency of measuring
the water-quality indicator parameters is based on the time required
to completely evacuate one volume of the flow cell and tubing. Meter
and graphical views help to determine when the change in parameter
readings falls within the specified target range.
PREPARATION
s
s
website, connect the computers in ActiveSync ® , launch the Win-
Situ Software Manager, and follow the instructions to install Pocket-
Situ 4 on the RuggedReader
TIP: When using the RDO sensor for low-flow monitoring, be
sure to install the most recent version of Win-Situ 4 and
Pocket-Situ 4, available at www.in-situ.com.
s
s
when prompted by the Flow-Sense Wizard:
s s
s
intake, referenced to a benchmark
s s
s s
RDO SENSOR PREPARATION
Special preparation is in order if you plan to use the sub-4” RDO ® opti-
cal dissolved oxygen sensor for low-flow monitoring. You will need:
RDO Optical Dissolved Oxygen sensor .................................. 0085070
Flow Cell for use with RDO sensor ......................................... 0057600
The RDO-ready flow cell includes hardware fittings for setting up the
flow cell and installing the RDO sensor.
PREPARE THE FLOW CELL
Connect valves and tubing to flow cell body. Attach spike or base
plate. Insert the calibrated TROLL 9500 into the flow cell. Turn on the
pump.
Flow cell for sub-4” TROLL 9500
MP TROLL 9500
OUTFLOW
INFLOW
Flow cell for sub-2” TROLL 9500