{"product_id":"solinst-model-122-interface-meter-series","title":"Solinst Model 122 Oil\/Water Interface Meter – LNAPL \u0026 DNAPL Detection","description":"\u003ch2\u003eSolinst Model 122 Oil\/Water Interface Meter\u003c\/h2\u003e\n\u003cp\u003eThe Solinst Model 122 Interface Meter measures depth to water and non-conductive product interfaces in wells and tanks. It distinguishes conductive water from separate-phase liquids, supporting measurements of floating LNAPL and sinking DNAPL layers encountered during environmental investigations and remediation monitoring.\u003c\/p\u003e\n\u003cp\u003eThe meter combines a 16 mm (5\/8 in) P8 probe with laser-marked PVDF flat tape and a portable reel. Choose an imperial configuration from 100 to 1,000 ft or a metric configuration from 30 to 300 m using the options on this page.\u003c\/p\u003e\n\u003ch2\u003eDifferent Signals for Product and Water\u003c\/h2\u003e\n\u003cp\u003eThe P8 probe combines optical liquid detection with an electrical conductivity circuit. The optical sensor detects liquid contact, while the conductivity circuit distinguishes conductive water from non-conductive product.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNon-conductive product: steady light and tone\u003c\/li\u003e\n\u003cli\u003eConductive water: intermittent light and tone\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eDepths are read manually from the tape at your measurement reference point. The meter does not display a digital depth or automatically calculate product thickness.\u003c\/p\u003e\n\u003ch2\u003eLNAPL and DNAPL Layer Measurements\u003c\/h2\u003e\n\u003cp\u003eLNAPL refers to light non-aqueous phase liquid that can float on water. DNAPL refers to dense non-aqueous phase liquid that can occur beneath water. The 122 helps locate interfaces between these separate-phase liquids and conductive water.\u003c\/p\u003e\n\u003cp\u003eFor floating product, apparent layer thickness in the well is calculated from the difference between the depth to the top of product and the depth to the product\/water interface. Use a consistent reference point and follow Solinst’s measurement procedure to reduce errors caused by product adhering to the probe.\u003c\/p\u003e\n\u003cp\u003eThe meter detects liquid interfaces; it does not identify the chemical composition of a product or measure dissolved contaminant concentrations. Product thickness observed in a well should not automatically be treated as the thickness of product throughout the surrounding formation.\u003c\/p\u003e\n\u003ch2\u003eP8 Probe and Laser-Marked Flat Tape\u003c\/h2\u003e\n\u003cp\u003eThe factory-sealed P8 probe is 16 mm (5\/8 in) in diameter and pressure-proof to the full length of the submerged tape. An integral stainless steel shield protects the sensing area while allowing cleaning.\u003c\/p\u003e\n\u003cp\u003eThe 10 mm (3\/8 in) wide PVDF flat tape has permanent laser markings every 1\/100 ft on LM2 imperial models or every millimeter on LM3 metric models.\u003c\/p\u003e\n\u003cp\u003eSolinst describes sensor interface detection accuracy as good as 1.0 mm or 1\/200 ft. This sensor specification is separate from tape graduation spacing and actual field measurement accuracy also depends on conditions and measurement technique.\u003c\/p\u003e\n\u003ch2\u003eHazardous-Location Approvals and Grounding\u003c\/h2\u003e\n\u003cp\u003eSolinst identifies the Model 122 as intrinsically safe, with QPS approval based on CSA standards for Class I, Division 1, Groups C and D, and an ATEX designation of II 3 G Ex ic IIB T4 Gc.\u003c\/p\u003e\n\u003cp\u003eUse the instrument only within the classifications, conditions, and limitations shown on its label and applicable certification documents. Confirm suitability for your site before use.\u003c\/p\u003e\n\u003cp\u003eAlways ground the meter using its grounding cable as directed by Solinst. Follow the operating instructions for approved battery types, battery replacement, environmental restrictions, and equipment handling. The probe’s submergence rating does not apply to the reel.\u003c\/p\u003e\n\u003ch2\u003eApplications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eLocating oil\/water interfaces in monitoring wells\u003c\/li\u003e\n\u003cli\u003eMeasuring apparent floating product thickness in wells\u003c\/li\u003e\n\u003cli\u003eInvestigating accessible sinking product layers\u003c\/li\u003e\n\u003cli\u003eEnvironmental site assessment and remediation monitoring\u003c\/li\u003e\n\u003cli\u003eProduct and water interface measurements in compatible tanks\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe 122 is a manual instrument and does not automatically log readings. Contact Activated Carbon Depot for help selecting tape length, measurement units, or project quantities.\u003c\/p\u003e","brand":"Solinst","offers":[{"title":"100 Feet - 114813","offer_id":44588400804029,"sku":"114813","price":889.0,"currency_code":"USD","in_stock":true},{"title":"200 Feet - 114814","offer_id":44588400836797,"sku":"114814","price":1037.0,"currency_code":"USD","in_stock":true},{"title":"300 Feet - 114815","offer_id":44588400869565,"sku":"114815","price":1184.0,"currency_code":"USD","in_stock":true},{"title":"500 Feet - 114823","offer_id":44588400902333,"sku":"114823","price":1558.0,"currency_code":"USD","in_stock":true},{"title":"750 Feet - 114824","offer_id":44588400935101,"sku":"114824","price":1927.0,"currency_code":"USD","in_stock":true},{"title":"1000 Feet - 114825","offer_id":44588400967869,"sku":"114825","price":2296.0,"currency_code":"USD","in_stock":true},{"title":"30 Meters - 114816","offer_id":44939019944125,"sku":"114816","price":955.0,"currency_code":"USD","in_stock":true},{"title":"60 Meters - 114811","offer_id":44939019976893,"sku":"114811","price":1113.0,"currency_code":"USD","in_stock":true},{"title":"100 Meters - 114812","offer_id":44939020009661,"sku":"114812","price":1272.0,"currency_code":"USD","in_stock":true},{"title":"150 Meters - 114820","offer_id":44939020042429,"sku":"114820","price":1673.0,"currency_code":"USD","in_stock":true},{"title":"250 Meters - 114821","offer_id":44939020075197,"sku":"114821","price":2069.0,"currency_code":"USD","in_stock":true},{"title":"300 Meters - 114822","offer_id":44939020107965,"sku":"114822","price":2465.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0664\/1408\/4285\/files\/solinstmodel122.png?v=1750714406","url":"https:\/\/activatedcarbondepot.com\/products\/solinst-model-122-interface-meter-series","provider":"Activated Carbon Depot","version":"1.0","type":"link"}