Xylem WL550 OIL WATER INTERFACE METERS - Manual (Page 7)

Global Water
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The probe is fully pressure rated and the oil/water interface meter will detect both
floating and sinking product. To avoid the probe suddenly striking obstructions in the
well, lower the probe at a moderate speed.
The most accurate readings will be possible when the probe first detects oil as it is
being lowered. Upon removal however, very viscous oil will drip from the probe, in
some cases completely covering the prism and the instrument may indicate it is still
immersed in product. To avoid this, when in very viscous oil, remove the probe more
slowly right at the oil/air interface for a more accurate reading.
As the probe passes through the oil/water interface, the oil will have a tendency to be
dragged down with the probe, which essentially coats the water sensing pins. For
that reason, the most accurate reading of the oil/water interface will be possible
when it is measured as the probe is being RAISED or removed from the water and is
entering the oil or floating product.
The above effects are very small and will not seriously affect the accuracy of the
instrument, however for very precise readings, it is possible to reduce the above
effect to less than the resolution of the instrument.
Do not use the probe to measure sand backfill as the tape and or probe can very
easily trapped or locked into the backfill. A very small volume of sand will make it
impossible to remove the tape and probe.
Cleaning the Dipmeter
The probe and prism or electrode assemblies are made from Stainless steel, Teflon,
Nylon and Delrin. To ensure optimum performance, clean the meter after every use.
Although not cleaning the unit, will not harm the unit, it will typically perform more
satisfactorily if it is clean. Equal parts vinegar and water can be used to clean the
water sensing electrodes after removing the battery! Soak in the solution overnight
for several hours then wipe clean. REMOVE BATTERY FIRST.
However do not use ANY abrasives, partially halogenated hydrocarbons, or water
soluble organic solvents to clean the probe or unit. Alcanox 10%, detergent 10%
can be used to clean the probe and reel. Rinse thoroughly with water right after
cleaning with detergent or Alcanox.