Model 122 Oil Water Interface Meters

solinst model 122 oil water interface meters

The Model 122 Oil/Water Interface Meter is designed to measure floating or sinking hydrocarbon layers in water (LNAPL and DNAPL).

The Model 122 P8 16 mm (5/8") narrow pressure-proof probe clearly detects when it enters product or water, with an accuracy of 1 millimeter or 1/200 ft. It is excellent in almost all product monitoring applications.

It uses optical refraction and electrical conductance to determine product and water interfaces. A continuous light and tone indicate non-conductive product. Water is indicated by intermittent signals.

The depths of detected water and product layers are read off flat tape, which is laser-marked each millimeter or every 1/100 ft. The durable, corrosion-resistant tape is easy to clean and ideal to use when measuring in wells, tanks, at refineries, landfills or remediation sites.

The Model 122 Interface Meters are certified intrinsically safe for use in explosive environments, and are ATEX certified.

One 9V battery provides a minimum 120 hours of life. The electronics have automatic circuitry testing and they shut off after 5 minutes.

solinst model 122 oil water interface meter p8 probe


122 Length Options:
Small Reel 30 m 100 ft.
  60 m 200 ft.
  100 m 300 ft.
Medium Reel 150 m 500 ft.
  250 m 750 ft.
  300 m 1000 ft.


solinst pvdf laser marked flat tape

LM2: Feet and tenths: with markings every 1/100 ft.
LM3: Meters and centimeters: with markings every mm


Laser Marked Replacement Tapes

Solinst measurement devices that use laser-marked flat tape, also use the same tape seal plug/probe connection. Therefore, replacement tapes are interchangeable and can be used with the 101 P7 Water Level Meter, 101D Water Level DrawDown Meter, 201 Water Level Temperature Meter, 107 TLC Meter, 122 P8 Interface Meter, and 105 Well Casing & Depth Indicator.

solinst laser marked pvdf replacement tapes



solinst oil water interface meter in well


solinst model 122m mini oil water interface meter


A Model 122M Mini Interface Meter has a small reel, designed for portability. It uses narrow 3 mm (0.12" ) cable with a durable lasermarked jacket, in lengths of 25 m or 80 ft.

The compact reel to fit easily in a backpack. The Model 122 Mini electronics provide up to 300 hours of use with one 9V battery. It uses the same P8 Probe as the Model 122.



solinst laser marked cable

LN2: Feet and tenths: with markings every 1/100 ft.
LN3: Meters and centimeters: with markings every mm


Once an oil layer is detected, a sample can be taken using the Solinst Model 425 Discrete Interval Sampler. The 425 Discrete Interval Sampler is excellent for obtaining no purge water samples from below and above product layers, and from within the actual product.