Xylem WL550 OIL WATER INTERFACE METERS - Manual (Page 8)

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VI. Troubleshooting
Unit makes no sound when start button pushed.
a. Battery is reversed or is flat. Replace battery in a safe area. Check
polarity.
Unit makes no sound in water.
a. Verify water is not distilled. Clean water sensing electrodes.
Unit sounds constantly
a. Battery is low. Replace.
b. The connection to the tape and module should be checked. Clean the
tape to module connection by attaching and detaching 4-6 times. This
will remove any oxides that may have formed. This is rare but can
happen and it is very easy to remedy.
c. Clean the prism assembly.