Tape Guide (Optional)
Measurement point
(Deduct 2/10 ft or 60 mm)
Fit onto well casing
122M (Pg 1)
Mini Interface Meter Operating Instructions
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
flamable gases trapped in well.
Remember to switch off after use, as the meter will not turn
off automatically.
IMPORTANT
Reverse polarity can cause probe damage. Ensure correct
battery placement.
High Quality Groundwater and Surface Water Monitoring Instrumentation
Model 122M
Operating Principle
The Solinst Model 122 Mini Interface Meter has a narrow
5/8” (16 mm) diameter probe. 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 turning the
unit ‘ON’. A brief tone and red light indicate that the meter
is functional.
Cleaning and Maintenance
After each use, the tape should be wiped clean and carefully
rewound onto the reel. An alternative is to steam clean the tape
only. The probe should be cleaned as follows:
1. Wash the probe thoroughly with a non-abrasive mild
detergent. DO NOT USE ANY SOLVENTS. Use a soft
cloth around the pins and on the prism on the end of the
probe to remove all product. Use lukewarm water, not hot
water or you may damage the probe.
2. Rinse probe thoroughly with distilled water, wipe dry.
3. Return the probe to the holder.
Battery Replacement
If the tones get weak, battery power is getting low and you
should replace the battery before you go into the field. Push
battery drawer in and up and then pull out. The battery
drawer should eject slightly to make pulling out easier.
Replace the battery with an alkaline 9 volt battery.
Field Measurements
1. Turn the rotary power switch ‘ON’. A brief tone and light
indicate that the meter is functional. The meter will stay
‘ON’ until the power switch is turned back to ‘OFF’.
2. Lower probe into well. If a tape guide is used, lay the tape
onto the groove on the top. Measurements will be read at
the point of the V-notch on the tape guide. Remember to
deduct 2/10 ft or 60 mm.
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 tape 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 tape.
8. Continue lowering the probe slowly until the tape slackens
when the well bottom is reached. Read the level directly
from the tape and subtract one from the other to determine
thickness.
9. Upon completion of readings, turn the rotary switch to
the ‘OFF’ position. Clean the tape and probe as described.
General Tips
1. The probe should be cleaned after each use.
2. Always use the grounding cable.
3. Do not drop probe.
4. If the tones are weak, replace battery.
5. Before storage, make sure that the meter is turned ‘OFF’.
6. The meter can be checked by placing the probe in pure
phase product, for example lamp oil (avoid bright
sunlight during testing). A steady tone and light should be
observed.
Where possible, use the Solinst Tape Guide to protect the tape
from scraping on well casing.
Troubleshooting
For further information contact: Solinst Canada Ltd.
Fax: +1 (905) 873-1992; (800) 516-9081 Tel: +1 (905) 873-2255; (800) 661-2023
35 Todd Road, Georgetown, Ontario Canada L7G 4R8
Web Site: www.solinst.com E-mail: instruments@solinst.com
122M (Pg 2)
October 10, 2006
Instrument will not turn ‘ON’
(no starting tone)
1. Replace the battery
2. Check the polarity of the battery in the drawer: make
sure the + and - on the battery and the drawer match.
The probe may be harmed by a reversed battery.
3. ON/OFF switch could be faulty. Contact Solinst.
When instrument is turned ‘ON’, it immediately
sounds product tone or intermittent water tone
1. Probe sensor may be dirty. Clean according to Cleaning
and Maintenance instructions.
2. Water may have leaked into the probe. Remove three
small screws and slide the probe down from the tape
portion. (Keep the wires attached.) Dry out the probe,
wipe and inspect the o-ring, replace if necessary and/or
lubricate with silicone. Replace the probe carefully.
3. Tape may be damaged. Clean the tape and seal any
cuts. You may contact Solinst for assistance.
4. The reel or probe circuitry could be damaged.
Please contact Solinst.
Instrument does not detect liquid
1. Check battery. Replace if necessary.
2. Clean probe tip following cleaning and maintenance
instructions on previous page.
3. Probe may be damaged. Please contact Solinst.
Instrument detects “Product” as “Water”
1. Note that this can happen if the probe is pulled into
product too quickly and therefore pulls water in with it.
Thoroughly dry the stainless steel shroud covering
the probe tip or shake the probe and try again at a
slower speed.
2. Product may have degraded or is now disturbed enough
to become an emulsion. If it has a detectable level of
conductivity, it will read water. Wait for it to settle and
try again.
Instrument does not detect water
1. Clean the probe tip. Follow the Cleaning and
Maintenance instructions.
2. The water could be pure and non-conductive or product
may be coating the probe, in which case, shake the
probe for a while in the water column to clean product
from the probe.
3. The probe circuitry could be damaged due to high
voltage (static) in the well. Always use a ground cable.
Please contact Solinst.
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