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Mini Interface Meter
Model 122M
The 122 Mini Interface Meter is a convenient small version of the Solinst Interface Meter, small enough to fit in a backpack. A custom carrying bag is also an option.
The Mini is available in 65 ft. or 20 m lengths. The 5/8" (16 mm) diameter probe is attached to narrow 1/4" (6 mm) tape, which is accurately marked each 1/100 ft. or millimeter. Enhanced electronics allow operation for up to 300 hours of on-time, using one 9V battery.
Obtaining Product Measurements
To measure the thickness of a product layer, lower the probe into the well until the signals activate. If there is an oil/product layer on the top of the water (LNAPL), the light and tone will be steady, indicating an air/product interface.
Read the depth off the permanently marked tape. Lower the probe further into the water, where the signals become intermittent, then pull back up and take a reading at the product/water interface. The thickness of the product layer is then determined by subtracting the first reading from the second.
If there is only water in the well and no product, there will only be intermittent (water) signals.
The presence or absence of dense (sinking) non-aqueous layers (DNAPL) is determined by continuing to lower the probe to the bottom of the well.
 If the steady tone and light return, this indicates a non-conductive liquid. Measure the depth and continue lowering the probe until it touches bottom and the tape goes slack.
To determine the thickness of the DNAPL layer, subtract the first reading from the bottom depth.
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