MN301420 rev A
13
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Maintenance
Step Twelve
CURRENT TEST (ULTRASONIC AND VIBRATION ONLY):
Used to verify if the sensor is indicating a wet or dry condition. This test uses only two wires (Red and Black).
The sensor draws 5 mA (ultrasonic) or 8 mA (vibration) when it is dry, and 19 mA when wet. The White and
Green wires are not used.
RELAY CONTACT TEST (ULTRASONIC AND VIBRATION ONLY):
Used to verify if the relay contact is switching between dry (open) and wet (closed). Test requires Red wired to
Positive (+) and Black wired to Negative (-) on a 12 to 36 VDC power supply. Check for continuity across
Green and White (open for dry and closed for wet). Reversing Red and Black wires will result in a closed when
dry and open when wet condition.
NORMALLY OPEN WIRING:
CONTACT TEST (BUOYANCY ONLY):
Used to verify if the reed switch is switching between dry (open) and wet (closed). Check for continuity across
Black and White (open for dry and closed for wet). Checking across Black and Red will result in a closed when
dry and open when wet condition.