Solinst

122M Mini Oil/Water Interface Meter

Compact, intrinsically safe interface meter that measures the depth and thickness of floating and sinking product layers in wells and tanks.

Narrow laser-marked coaxial cable in 25 m or 80 ft lengths on a small reel that fits in a backpack
16 mm (5/8") P8 probe with sensor accuracy to 1.0 mm or 1/200 ft
Up to 300 hours of on-time from one 9 V battery

Quantity

Overview

The Solinst Model 122M Mini Oil/Water Interface Meter gives clear and accurate measurements of product level and thickness in wells and tanks, for both light (floating) non-aqueous phase liquids (LNAPL) and dense (sinking) non-aqueous phase liquids (DNAPL). It is a convenient small version of the Model 122, using narrow laser-marked cable in 25 m or 80 ft lengths on a compact reel that fits easily in a backpack or an optional mini carry case. An infra-red beam detects liquids and a conductivity circuit distinguishes water: steady signals indicate product, while intermittent signals indicate water.

Typical applications

Measuring the depth and thickness of floating product layers (LNAPL) in wells and tanks
Detecting and measuring sinking product layers (DNAPL) down to the bottom of the well
Shallow product monitoring where a compact, portable meter is needed
Measurements in hazardous locations (Class I, Div 1, Groups C & D) and potentially explosive environments

Key Features

Infra-red refraction detects liquids; conductivity distinguishes water from product
Product = steady light and tone; water = intermittent light and tone
Sensor accuracy to 1.0 mm or 1/200 ft, enough to detect the slightest sheen of oil on water
Both sensors use exactly the same zero point
16 mm (5/8") stainless steel P8 probe, pressure proof the full length of the submerged cable
3 mm (0.12") coaxial cable laser marked each mm or every 1/100 ft, with a smooth chemical-resistant surface that is easy to decontaminate
Compact reel, easy to transport in a backpack
Stable electronics with automatic circuitry testing; minimum 300 hours of battery life
Certified intrinsically safe (CSA-based) and ATEX certified

Benefits

Portable: Compact reel that fits in a backpack or an optional mini carry case.
Accurate: Sensor accuracy to 1.0 mm or 1/200 ft detects the slightest sheen of oil on the water surface.
Long Battery Life: A minimum of 300 hours of on-time from one standard 9 V battery.
Rugged: Designed for rugged field use, with stable electronics and automatic circuitry testing.

Specifications

MEASUREMENT
Detects	LNAPL (floating product), DNAPL (sinking product) and water
Detection method	Infra-red refraction to detect liquid; conductivity circuit to distinguish water
Signals	Product: steady tone and light Water: intermittent tone and light
Sensor accuracy	1.0 mm or 1/200 ft
Zero point	Tip of the stainless steel conductivity pin

P8 PROBE
Diameter	16 mm (5/8")
Material	Stainless steel, with Hydex cone-shaped tip and integral stainless steel shield
Pressure rating	Pressure proof the full length of the submerged cable

CABLE
Cable	3 mm (0.12") coaxial cable with PVDF jacket
Markings	Laser marked each mm or every 1/100 ft; traceable to NIST and EU measurement standards
Conductors	Braided copper outer conductor; stranded stainless steel central conductor
Cable lengths	25 m or 80 ft
Splicing	Do not splice or repair the cable, to maintain intrinsic safety certification

ELECTRONICS AND POWER
Power	One 9 V alkaline battery in an easy-access drawer (Duracell MN1604 or Energizer 522 only, per faceplate label)
Battery life	Minimum 300 hours of on-time
Auto shut off	After 5 minutes
Start-up check	Automatic circuitry testing; five brief tones and flashing red light when functional

HAZARDOUS LOCATIONS
CSA standards	Class I, Div 1, Groups C & D T3C (QPS approved)
ATEX	II 3 G Ex ic IIB T4 Gc (Directive 94/9/EC)
Ambient temperature (per faceplate label)	Ta = -40 °C to +50 °C
Grounding	Always ground the meter to the metal well casing or a grounding rod

ORDERING CODES
LN2	Feet and tenths, with markings every 1/100 ft
LN3	Meters and centimeters, with markings every mm

ACCESSORIES
Included	Cleaning brush
Optional	Custom mini carry case; tape guide (measurement point offset 6.0 cm or 2/10 ft)

Drawing

122M-Mini-Oil-Water-Interface-Meter-Diagram

Downloads

122M Mini Oil/Water Interface Meter Datasheet (EN)	Download122M Mini Oil/Water Interface Meter Datasheet (EN)
122M Mini Oil/Water Interface Meter User Manual (EN)	Download122M Mini Oil/Water Interface Meter User Manual (EN)