The Interface Meter is perfect for determining both water level and NAPL contamination within wells. It consists of a probe attached to a polyethylene tape at one end, and at the other end a reel containing the electronic components of the instrument.
Two stainless steel conducting cables run down the length of the tape from the reel to the probe. The probe incorporates an infra-red beam and a detector receiving the light signal.
When the probe is submerged in any liquid the light is refracted away from the detector causing the system to go into alarm mode. If the layer is NAPL (conductivity less than 50uS/cm) the alarm will sound with a steady tone and light.
When the probe hits water (conductivity greater than 50uS/cm) the infra-red alarm circuit is overridden and the conductivity alarm is activated, noticeable by a rapid intermittent tone and flash of light.
The 122 Interface Meter measures water and product level and thickness, accurately to 1.0 millimeter or 1/200 ft. It measures floating and sinking hydrocarbon, non-aqueous product layers (LNAPL and DNAPL), using a 16 mm (5/8″) diameter pressure-proof probe. The 122 is certified intrinsically safe, and is ATEX certified.
Readings are taken from accurate laser marked flat tape up to 300 m (1000 ft). The tape is very easy to clean. The 122 is rugged and simple-to-use.