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122 Oil/Water Interface Meter

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

  • Steady tone and light for product (LNAPL or DNAPL), intermittent signals for water
  • 16 mm (5/8") P8 probe with sensor accuracy to 1.0 mm or 1/200 ft
  • Laser-marked flat tape in lengths from 30 m to 300 m (100 ft to 1000 ft)
Quantity
1

Overview

The Solinst Model 122 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). The probe uses an infra-red beam to detect liquids and a conductivity circuit to distinguish water: a steady tone and light indicate product, while intermittent signals indicate water. The factory-sealed 16 mm (5/8") probe is pressure proof the full length of the submerged tape, and the meter is certified for use in hazardous locations.

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
  • Product level monitoring in narrow wells and tight spaces
  • 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
  • Optical and electronic sensors aligned at the same zero point
  • Factory-sealed 16 mm (5/8") stainless steel P8 probe, pressure proof the full length of the submerged tape
  • Integral stainless steel shield protects the sensors and allows easy cleaning
  • Laser-marked flat tape, easy to decontaminate and resistant to stains and most chemicals
  • Automatic circuitry testing at start-up and automatic shut off after 5 minutes
  • CSA intrinsically safe and ATEX certified
  • Replacement tapes are interchangeable with other meters

Benefits

  • Accurate: Sensor accuracy to 1.0 mm or 1/200 ft detects the slightest sheen of oil on the water surface.
  • Reliable: Stable electronics with automatic circuitry testing and clear signals.
  • Robust: Designed for rugged field use, with a non-stretch, non-corroding tape and a sturdy free-standing reel.
  • Easy to Decontaminate: The smooth laser-marked flat tape resists stains and most chemicals.

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 tape

Construction

Factory sealed; does not need to be accessed by the user

 

 

TAPE

 

Tape

Laser-marked PVDF flat tape, 10 mm (3/8") wide, dog bone shape

Markings

Every mm or every 1/100 ft; traceable to NIST and EU measurement standards

Conductors

Stranded stainless steel and copper coated steel; non-stretch, does not corrode

Tape lengths

30 m to 300 m (100 ft to 1000 ft)

Splicing

Do not splice the tape, to maintain intrinsic safety certification

 

 

ELECTRONICS AND POWER

 

Power

Single 9 V alkaline battery in an easy-access drawer (Duracell MN1604 or Energizer 522 only)

Battery life

120 hours of on-time

Auto shut off

After 5 minutes

Start-up check

Automatic circuitry testing when the START/OFF button is pressed

 

 

HAZARDOUS LOCATIONS

 

CSA

Class I, Div 1, Groups C & D T3C

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 use the grounding cable for safety and to protect the electronics

 

 

ORDERING CODES

 

LM2

Feet and tenths, with markings every 1/100 ft

LM3

Meters and centimeters, with markings every mm

 

 

SUPPLIED WITH

 

Included

Grounding cable, cleaning brush, tape guide/datum

Optional

Carrying case with shoulder strap

Drawing

122-Oil-Water-Interface-Meter-Diagram

Downloads

122 Oil/Water Interface Meter Datasheet (EN) Download122 Oil/Water Interface Meter Datasheet (EN)
122 Oil/Water Interface Meter User Manual (EN) Download122 Oil/Water Interface Meter User Manual (EN)