ID-221 Oil Sheen Sensor




Data Sheet



A Leakwise system consists of a controller and one or more sensors.
The ID-221 sensor has a current line high-frequency transmitter mounted on a float that maintains its position precisely at the liquid/air interface, despite fluctuations in liquid level up to 45 m (150 ft.) variation. A single ID-221 sensor 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-221 can detect as little as 0.3 mm (0.01 in) oil layer on water reliably, repeatedly and without false alarms. It also monitors online changes in oil layer thickness up to 25 mm (1.0 in) and report it through a 4-20 mA output signal from the controller. Controller relays are used for local and remote alarms and control. Continuous built-in diagnostics monitor sensor operation. The SLC-220 digital controller handles up to four sensors. A stilling well is recommended for all ID-221 installations (available as an optional accessory).


ID-221 Sensor Specifications


Summary: Floating sensor capable of monitoring hydrocarbons and other organic solvents in wet sumps.


Detection Range: 0.3 – 25 mm (0.01 – 1.0 in) of hydrocarbon on water or brine

Water Level Variation: Minimum: 30 cm (~12 in) above well/tank/sump bottom; Maximum: 45 m

(~150 ft.).

Water Lateral Velocity: ~20 cm/sec (~8 in/sec) when installed in a stilling well

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

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



Materials: Hydrocarbon resistant polymers, 316 stainless steel.

Diameter: 87 mm (3.4 in), height: 235 mm (9.3 in); fits into 100 mm (4.0 in) stilling wells

Integral Cable: 10 m (~33 ft.) supplied with sensor, additional length to order up to 50 m (164 ft.) total

Accessories: Stilling well in 1 m and 2 m long sections, which can be assembled to any required length.

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-221 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 relays with dry contacts and one fail relay contact: SPDT rated 4A (3A for fail

contact) at 250 VAC or 30 VDC, normally open and normally closed, and four status indication lights: Water, Oil, Air/High Oil and Fail. Includes built-in diagnostics.

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): 305 x 195 x 120 mm (12.0 x 7.7 x 4.7 in) 2 Kg (4.4 lb.);

-N7 for NEMA 7: 278 x 259 x 166 mm (11.0 x 10.2 x 6.5 in) 8.5 Kg (18.7 lb.);

-Exd for Ex d: 355 x 276 x 200 mm (14.0 x 10.9 x 7.9 in), 14 Kg (30.9 lb.);

-BP: without an enclosure, to be mounted in a local cabinet. 190 x 180 x 130 mm, 1 Kg.

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

SLC-220: Digital Signal Processor for up to four ID-220 Series sensors support, with various output

options, including relays, lights, 4-20 mA, LCD, Modbus in RS-232 and RS-485 communication, and remote cellular connectivity. Controllers – Refer to separate data sheets

Sensor and PS-220 Controller Certifications

ID-221 Sensor : ATEX Intrinsically Safe: II1G Ex ia IIC T4 Ga -40 °C to +70 °C. Also: IECEx, UKEX and cETLus

PS-220 Enclosure For hazardous areas:

North America – NEMA 7, Class I, Div 1, Groups B, C & D; NEMA 4

Europe ATEX & IECEx – II2(1)GD, Ex db [ia Ga] IIC T6 Gb IP66

Combined System: Approved for operation in hazardous locations when Zener Safety Barriers are added

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

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

Manufacturing ISO 9001:2015 Certified


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