Step 2. Tank Preparation
A). Pre-Drilled Tanks
A lot of oil tanks may already have a pre-drilled 32mm opening on the top. If so, ensure the hole is a minimum diameter of 30mm.
Ensure that the space beneath the
Watchman unit is free of any obstacles and that the ultrasonic path is clear from obstructions as show in the image.
B). Un-Drilled Tanks
When drilling is required for fitment of the transmitter, choose a flat level point that is at the same level and no higher than any opening on the top of the oil tank (filling point etc.).