ID-227 Oil Sheen Sensor for Large Waterways Applications


The Leakwise ID-227 sensor detects the presence of and monitors the buildup of thin layers of hydrocarbons or other organic solvents on water. It is used for early detection, warning, and control of oil leaks and spills in lakes, rivers, open channels and large retention ponds, for example before and after a hydro generation plant.

ID-227 Description

A Leakwise system consists of a controller and one or more sensors (also called detectors). The ID-227 sensor has a high frequency transmitter mounted on a Wave Rider buoy that maintains its position precisely at the liquid/air interface, despite fluctuations in the liquid level and waves. 


The ID- 227 operates in an unlimited fluctuating liquid levels, 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
  • High oil alarm – Detection of a hydrocarbon layer at a second predefined thickness


The ID-227 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 (0.79 in). The ID-227 is connected to the Controller with a floating cable. The Controller relays are used for local and remote alarms and control. Continuous built-in diagnostics monitor sensor operation. An appropriate mooring should be designed and implemented according to actual site conditions.

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.

Technical Specifications



Floating sensor capable of monitoring hydrocarbons and other organic solvents on water and in sumps that may be dry.


Detection Range:

0.3 – 20 mm (0.01 – 0.79 in) of hydrocarbon on water or brine

Minimum water Depth: 30 cm (~12.0 in)

Tide Range: Determined by mooring design and implementation

Working Wave Height: Maximum 2 m (6.6 ft.)

Current: Up to 0.5 knot

Survival Conditions:

Depending on the appropriate mooring

Mooring: Designed and supplied by the customer.

Should enable free floatation of the Wave Rider in all operational conditions.

Water Temperature: 0 – 70° C (32 – 158° F); no freezing

Air Temperature: -10 – 80° C (14–176° F)

Physical Specifications

Sensor Materials: Hydrocarbon-resistant polymers, 316 stainless steel

Wave Rider Materials: Hydrocarbon resistant polymers, 316 stainless steel

Dimensions: Wave Rider: Diameter 900 mm (35.4 in); height: 300 mm (11.8 in); weight 10 Kg (22.0 lb.)

Integral Cable: 20 m (~66 ft.) supplied with sensor; first 10 m is a floating cable.

PS-220 Controller Specifications and Options


PS-220 Description: PS-220 Controller is an analog signal processor and power supply in a NEMA 4 enclosure, and supports a single ID-227 sensor.

Temperature: Ambient temperature range: -40 – 85° C (-40 – 185° F)

Cable length to Sensor: Up to 1,200 m (3,937 ft.) subject to hazardous area restrictions.

PS-220/RL/LI: Two alarm relay dry contacts and one fail contact: SPDT rated 4A (3A for fail contact) at 250 VAC or 30 VDC, 

normally open and normally closed, and four indicating lights: Air/Oil/Water/Fail. Includes a built-in diagnostics feature.

Wiring Connections: Terminal blocks: 14 AWG maximum for sensor and 4-20 mA output wires; 12 AWG maximum for power and relays wires.


Enclosure Options:

/N4/ for NEMA 4X (IP65): 300 x 190 x 120 mm (12.0 x 7.5 x 4.7 in) (standard enclosure);

/N7 for NEMA 7: 278 x 259 x 166 mm (11.0 x 10.2 x 6.5 in);

/Exd for Ex d: 302 x 233 x 154 mm (12.0 x 9.2 x 6.1 in).

Input Power Options: 220 or 110 VAC (50 – 60 Hz) or 9 – 36 VDC (@ 5 Watts); may also be solar powered.

/420/: 4-20 mA analog output proportional to hydrocarbon thickness up to 25 mm (1.0 in), current source

/420/BG/: Bar graph display (20 bars) of hydrocarbon thickness in addition to 4-20 mA analog output.

/CEN/: Zener Safety Barriers to allow installation of the sensor in hazardous areas.

/AUD/: Audio alarm option (available in weather-proof or explosion-proof enclosure).

Other Controllers – Refer to separate data sheets


Digital Signal Processor for Multiple (2 / 4 standard, more in a network) ID-220 Series sensor support, with various output options, including relay, lights, 4-20 mA, LCD, Modbus in RS-232 and RS-485 communication, and cellular remote connectivity.

Sensor and PS-220 Controller Certifications

ID-227 Sensor PS-220 Enclosure:

ATEX Intrinsically Safe: II1G Ex ia IIC T4 Ga -40° C to +70° C. Also: IECEx, UKEx and cETLus

For hazardous areas: North America – NEMA 7, Class I, Div 1, Groups B, C & D; Exd Europe – II2GD Ex d IIC T6 IP66

Combined System: Approved for operation in hazardous location

EPA – Conforms to Spill Prevention, Control and Countermeasure (SPCC) – Oil Pollution Prevention

Performance: regulation (40 CFR part 112), and EPA/530/UST-90/009 – Leak Detection Methods

Specifications may be subject to change without prior notice.

For special applications, it may be possible to offer products that deviate from the above specifications.

All rights reserved. 300 00096 Rev E ©2017