A Leakwise system consists of a controller and one or more sensors (also called detectors). The ID-221 sensor has a high frequency transmitter mounted on a float that maintains its position precisely at the liquid/air interface, despite fluctuations in the liquid level. The ID-221 operates with fluctuating liquid levels up to 45 m (150 ft.), and is controlled by the analog PS-220 Controller, which has two field adjustable alarm points:
• Low oil alarm – Detection of a first predefined layer thickness of hydrocarbons
The ID-221 can detect as little as 0.3 mm (0.01 in) oil on water reliably, repeatedly, and without false alarms. It can also monitor on-line changes in oil layer thickness up to 25 mm (1.0 in). The Controller relays are used for local and remote alarms and control. Continuous built-in diagnostics monitor sensor operation. A stilling well is recommended for all ID-221 installations (available as an optional accessory).