The Solinst Model 122 Interface Meter provides accurate hydrocarbon/water interface measurement for wells, tanks & remediation projects. It is a rugged, portable instrument designed for precision measurement of water and product layer depths and thicknesses, including floating (LNAPL) and sinking (DNAPL) non-aqueous phase liquids, in monitoring wells, storage tanks, and remediation sites. Built with a narrow 16 mm (5/8″) pressure-proof probe and high-resolution laser-marked flat tape, the Model 122 delivers reliable, repeatable interface data with clear visual and audible indicators for field technicians and environmental professionals.

The P8 Interface Probe is engineered to accurately distinguish between water and hydrocarbon product layers during interface measurements. Designed for reliability in challenging field conditions, the probe provides clear, repeatable signals that help eliminate guesswork when determining interface depth and product thickness.

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Note: If you require metric-marked cable, please contact us prior to ordering.

Key Features

• Measures both floating (LNAPL) and sinking (DNAPL) product layers in contact with groundwater and water columns with accuracy to 1 mm (1/200 ft).
• 16 mm (5/8″) narrow pressure-proof probe easily fits into tight wells and narrow monitoring points.
• Laser-marked PVDF flat tape — durable, corrosion-resistant, and easy to decontaminate — with lengths up to 300 m (1000 ft).
• Clear visual LED and audible signals distinguish product (steady tone/light) from water (intermittent tone/light) during measurement.
• Rugged free-standing reel with carrying handle for smooth deployment and reliable field performance.
• Intrinsically safe and ATEX certified for use in hazardous and explosive environments.
• Long battery life with easy access 9 V battery drawer, enhanced by automatic circuitry testing and shut-off.

Common Applications

• The Model 122 Interface Meter is ideal for professional use in a range of hydrocarbon and environmental monitoring tasks:
• Monitoring hydrocarbon product layers (LNAPL & DNAPL) in groundwater wells and remediation systems.
• Determining interface depth and product thickness in wells, tanks, pipes, and boreholes.
• Environmental site assessments (Phase I/Phase II ESA) requiring accurate delineation of product/water boundaries.
• Regulatory compliance and reporting involving petroleum, solvent, or chemical plumes.
• Hydrogeological investigations and remediation programs, where detailed layering data informs treatment and sampling strategies.
• Hazardous location deployments enabled by intrinsic safety and ATEX certification.