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It is essential that the floats move freely up and down inside the extension tubes, because they are what push the indicator up when a wetting front moves past the detector. This check should be made once the detector is assembled. The check can also be carried out once the detector is installed in the ground.

Inject 30 ml of water from syringe into the green 4 mm tubing. The float should pop up. If not, remove indicator cap and check that the last float protrudes 1 to 2 cm above extension. Check for stuck floats: Remove indicator cap, pour water down extension tube until all floats pop out. Check float pieces can pass through an extension tube without getting stuck.

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