In-Situ Oil/Water Interface Meter Instruction Sheet - Manual

Instruction Sheet
Innovations in
Water Monitoring
Page 1
Instrument Use
This instrument is designed to measure the thickness
of floating Light Nonaqueous Phase Liquid (LNAPL). It
will also detect and measure sinking layers of Dense
Nonaqueous Phase Liquid (DNAPL).
Switch the unit on by pushing the button in the center
of the electronic panel.
The unit shuts off automatically after 5 minutes. The
small green light indicates that the unit is ready for use.
If the green light turns off while the meter is in use,
push the button again and restart the unit.
Use the Following Method to Take Measurements
Lower the unit down the well until the top of the
water/LNAPL is reached.
(Intermittent Signal = Water. Continuous Signal =
LNAPL). Take note of the depth.
Do not try to measure the LNAPL/water interface at
this stage. Allow the probe to pass through the LNAPL
into the water below (indicated by the intermittent
signal).
Now slowly withdraw the probe until the signal
changes from the intermittent to continuous. This
point indicates the base of the product layer. Take note
of the depth.
This method prevents pushing the LNAPL into the
water and helps avoid false interface readings.
General Hints
Cold Weather
In cold weather, condensation will form on the lens as
it enters the well and contacts the warmer moist air in
Rugged Interface Meter and Rugged Mini Interface Meter
the well. This causes the unit to produce a continuous
sound as having detected LNAPL. To overcome this,
allow the probe to acclimatize in the well or lower the
probe into the water, then take readings.
A dirty or scratched probe lens can also cause the
instrument to produce a continuous signal.
Removing the Probe
Removing the probe requires two wrenches, a 1/2” AF
and 9/16” AF. When the knurled nut has been loosened,
the link may be still tight in the probe. Gently separate
the link from the probe by hand. Care must be taken to
avoid breaking the wires while removing the probe or
crimping the wires while replacing the probe.
Do
Avoid sharp-edged well casings. •
Avoid entanglement with other equipment in •
boreholes and wells.
Clean and dry the probe after use.
•
Rewind tape onto reel after use. •
Warranty is conditional upon adherence to these
guidelines.
Do Not
Use the instrument to plumb borehole depths. •
Use the instrument as a guide to backfilling with •
sand, because the instrument might get stuck.
Remember to...
Clean the unit after use. •
Avoid scratching the lens. •
Hang the unit on the well casing where possible, and •
run the tape over the tape guide on the frame. This
prevents damage to the tape.