Solinst 122M Operating Instructions

Operating Principle
The Solinst Model 122M Mini Interface Meter has a narrow
5/8" (16 mm) diameter probe, and uses laser-marked PVDF
jacketed cable. It is certified to CSA Standards, for use in
hazardous locations Class 1, Div. 1, Groups C & D T3C, and
is ATEX certified under directive 94/9/EC, as II 3 G Ex ic IIB
T4 Gc. An infra-red circuit detects the presence of a liquid and
a conductivity circuit differentiates between conductive liquid
(water) and non-conductive liquid (LNAPL or DNAPL product).
Equipment Check
Check the electronics and battery condition by pushing the
'On/OFF' button. Five brief tones and red light flashing indicates
that the meter is functional. It will automatically turn off after 5
minutes to preserve battery life.
IMPORTANT
For safety, always ground the meter by attaching the ground
cable to the metal well casing or to a suitable grounding
rod. Failure to properly ground this instrument could cause
damage to probe/electronics or result in an explosion from
any flammable gases trapped in well.
Field Measurements
1. Push the 'On/OFF' button. Five brief tones and the red
light flashing indicates that the meter is functional. The
meter automatically turns off after 5 minutes. Press the
'On/OFF' button as necessary during operation to turn the
meter back on.
2. Lower probe into well. If a tape guide is used, lay the
laser-marked PVDF cable onto the groove on the top.
Measurements are read at the V-notch on the tape guide.
Remember to deduct 2/10 ft or 6.0 cm.
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Interface Meter Operating Instructions
Handle
Indicator Light
High Quality Groundwater and Surface Water Monitoring Instrumentation
Tape Guide (Optional)
Fit onto well casing
3. A steady tone and light indicate a non-conductive liquid
(e.g. product). An intermittent tone and light indicate a
conductive liquid (e.g. water).
4. For floating product (LNAPL), take the air/product
interface measurement on the way into the liquid.
5. The interface between the LNAPL and water should be
measured as the probe is raised very slowly back up.
Once the interface is detected, the probe can be raised
and lowered in small increments to precisely determine the
interface.
6. Repeat measurements to confirm, reading the levels
directly from the cable and subtract one from the other to
determine thickness.
7. To determine if there is any sinking product (DNAPL) in the
well, continue lowering the probe slowly. If steady signals
activate, determine the top of the sinking layer by reading
directly from the cable.
8. Continue lowering the probe slowly until the cable slackens
when the well bottom is reached. Read the level directly
from the laser-marked PVDF cable and subtract one from
the other to determine thickness.
9. Upon completion of readings, clean the cable and probe as
described overleaf.
Model 122M (CSA-P8)
Sonalert
On/OFF Button
Battery Drawer
Measurement point
(Deduct 2/10 ft or 6.0 cm)