Operating Principles

122 Interface Meter: Operating Instructions


solinst 122 interface meter diagram


Operating Principle

The Solinst Model 122 Interface Meter has a narrow 5/8" (16 mm) diameter probe and uses laser-marked PVDF flat tape. It is certified to CSA Standards, for use in hazardous locations Class 1, Div. 1, Groups C & D T3C, and is ATEX certified under directive 94/9/EC, as II 3 G Ex ic IIB T4 Gc. It has an infra-red circuit which detects the presence of a liquid. A conductivity circuit differentiates between conductive liquid (water) and non-conductive liquid (LNAPL or DNAPL product).


Equipment Check

Before beginning any measurements, check the electronics and battery condition by pushing the ‘START/OFF’ button. Five quick beeps with the green light flashing, indicates that the meter is functional. A flashing green light every second indicates the meter is on. It will automatically turn off after 5 minutes to preserve battery life.


Using the Tape Guide

The tape guide has been designed to:

  1. The tape guide has been designed to: improve accuracy when reading interface measurements; to prevent the laser-marked PVDF flat tape being cut by well casing; and to allow the tape and probe to hang straight from the side of the well.
  2. If interface measurements are being taken in a 2" dia well then simply fit the small end of the tape guide onto the edge of the well casing.
  3. Insert the leg of the Interface Meter into the hole on the Tape Guide (small reels only).
  4. Once inserted, rest the Interface Meter on the side of the well casing.

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