PS-220 Analog Controller

The PS-220 Analog Leakwise Controller is a power supply and signal processor that interfaces with a single (1) Leakwise ID-220 Series Sensor to report hydrocarbons spill/leak alerts, including layer buildup and thickness, to users via outputs interfaces for local or remote reporting. The PS-220 has a well proven reliability and is cost effective for a basic monitoring system. It can be AC or DC line powered.


Typical PS-220 and Leakwise ID-220 Series Sensor applications include oil spill/leak monitoring in tank farm sumps, discharge from wastewater treatment plants, hydrocarbon pipeline pumping stations, hydroelectric and fossil fuel power plants, transformer substations, groundwater monitoring wells, remediation sites, etc.


• Low-power consumption.
• Built-in self-diagnostics of the controller and Leakwise Sensor.
• Simple calibration procedure.
PS-220 in Exd Enclosure, with Bar-Graph
PS-220 in NEMA 4 Enclosure

PS-220 Operation

The PS-220 supplies stabilized 12 VDC for powering the sensor. The returned current signal from the sensor is filtered and amplified, and then it is compared to two (2) alarm set-points to determine the status that the sensor reports: Water, Oil, High-Oil or Air, depending on the application. There are two relay outputs with dry contacts for reporting the status. An additional fail-safe operated relay reports sensor or power failure. There is an option to turn on a low-pass filter for applications with turbulent water and avoid false alarms. An optional 4-20 mA output reports oil layer thickness. An optional Bar-Graph visualize the oil layer thickness.

Technical Specifications1

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.
Cable length to Sensor


Ambient temperature range: -40 – 85° C (-40 – 185° F)
Up to 1,200 m (3,937 ft.) subject to hazardous area restrictions.
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 /420/420/BG/CEN/AUD:

220 or 110 VAC (50 – 60 Hz) or 9 – 36 VDC (@ 5 Watts); may also be solar powered.
4-20 mA analog output proportional to hydrocarbon thickness up to 25 mm (1.0 in), current source
Bar graph display (20 bars) of hydrocarbon thickness in addition to 4-20 mA analog output.
Zener Safety Barriers to allow installation of the sensor in hazardous areas.
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.
WSP-220: Wireless communication – Point-to-Point data radio.
Sensor and PS-220 Controller Certifications

ID-221 Sensor PS-220 Enclosure:

ATEX Intrinsically Safe: II1G Ex ia IIC T4 Ga -40° C to +70° C. Also: IECEx and CETLUS
For hazardous areas: North America – NEMA 7, Class I, Div 1, Groups B, C & D; NEMA 4 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

TÜV – Type approval in accordance with WHG (Water Resources Law) § 19 h
Manufacturing: ISO 9001:2015 Certified
1 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.

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