The Leakwise ID-223 sensor detects the presence of and monitors the buildup of thin layers of hydrocarbons in wet and dry environments. Many petroleum and power companies have installed the ID-223 in wet or dry sumps for early detection, warning, and control of oil leaks and spills from:
• Above-ground oil storage tanks
• Transformer sumps in switchyards and remote power distribution substations
• Oil/water separators
• Cooling water systems and trenches
• Storm water run-off
• Wastewater sewer systems
Other common applications include detecting and monitoring hydrocarbon leaks and spills in canals, retention ponds, and boiler condensate tanks. In addition, the ID-223 monitors wastewater treatment plant discharge to ensure regulatory compliance and can alert plant operators of any upsets in the treatment process.
A Leakwise system consists of a controller and one or more sensors (also called detectors). The ID-223 sensor has a high frequency transmitter mounted on a float built in a guiding cage. The floating sensor maintains its position precisely at the liquid/air interface, despite fluctuations in the liquid level.
The ID-223 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
• High oil alarm – Detection of a hydrocarbon layer at a second predefined thickness, or detecting a dry sump situation in certain applications
The ID-223 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 20 mm (0.8 in). The Controller relays are used for local and remote alarms and control. Continuous built-in diagnostics monitor sensor operation. A stilling well (available as an optional accessory) is recommended for ID-223 installations where lateral water velocity exceeds 30 cm/sec (11.8 in/sec).
The Leakwise ID-223 has three sub-models for different maximum water fluctuation capability:
• ID-223/500 – up to 500 mm (19.7 in)
• ID-223/2000 – up to 2,000 mm (6.6 ft.)
• ID-223/2500 – up to 2,500 mm (8.2 ft.)
Principle of Operation
The Leakwise sensors use a patented, high- frequency Electromagnetic Absorption technique. Each floating sensor houses a high-frequency electromagnetic energy transmitting and receiving antennas which continuously monitor the liquid surface. Since water absorbs more electromagnetic energy than hydrocarbons, changes in the absorption rate of water indicate the presence or buildup of hydrocarbons.
The Leakwise sensors can be used to detect and monitor the buildup of separated or emulsified non- soluble hydrocarbons on water and other aqueous solutions. No other oil sheen monitoring system does this.