Tabla de contenido
020365 ISS.07
5.
How To Use The Unit
How the unit works
5.1
The probe contains an infra-red emitter and an infra-red detector. When the unit is switched
on in air, the infra-red emitter sends out an infra-red beam inside a 45 degree prism. The
infra-red beam reflects off the internal face of the prism to the opposite face, which then
reflects the beam to the detector. In this state the unit is silent.
When the probe is lowered into fluids which are denser than air, the SNELL principle
operates. The infra-red beam is not reflected internally, but exits the prism and the detector
does not receive the infra-red beam. In this state the unit emits a continuous tone and the red
light is on.
At the same time the two conductivity probes are testing for conductivity. If the fluid does not
conduct electricity, the sound tone and light are solid - meaning the probe tip is in product.
If the fluid does conduct electricity, the tone is intermittent - meaning the probe is in water.
Solid tone
Intermediate tone
Taking Measurements
5.2
When taking measurements it is important the lens is cleaned prior to use. This will eliminate
any spurious readings from a contaminated lens.
The probe should be lowered down the borehole in a controlled manner and not dipped in
with the brake off. If the probe is dropped down a borehole damage to the probe could occur
if it sticks the base of the well.
First lower the probe into the well and note the depth of the top of the liquid (oil).
Next lower the probe further into the well until the water signal is given.
Now carefully raise the probe until the product (oil) signal is heard.
Note this depth. This is the depth of the underside of the oil layer. You now have depth to
product and depth to the interface of product and water.
Page 8
=
Product detection
=
Water detection
Oil Water Interface Meter
Geotech (UK) Limited
Tabla de contenido
