Issue Date: April 22, 2003
Revision Date:
February 16, 2005

SGB (Sicherungsgeratebau GmbH)

Vacuum Leak Detection System Models VLX 30, VLX 350, and VLX 400


Certified per European leak detection standard prEN 13160-2, Part 2, Version 2, as a Class I leak detection system.

Operating Principle:
System uses an integral vacuum pump to continuously maintain a partial vacuum within the interstitial space of a double-walled tank. System is designed to activate a visual and acoustic alarm before stored product can escape to the environment. System is capable of detecting breaches in both the inner and outer walls of double-walled tanks.

Alarm Condition:
System alarms when liquid enters the interstitial space or an air leak occurs where the interstitial vacuum decreases (pressure increases) to the appropriate “Alarm 'On' Pressure" (See table below).

Double-walled or lined single-walled horizontal (underground or aboveground) cylindrical tank with flat or dished head, storing gasoline, gasohol, diesel, heating oil #2, kerosene, aviation fuel, motor oil, water.

Manufacturer’s Specifications:
The interstitial space shall be rated for the operating vacuum of the leak detector as indicated in the following table, regardless of temperature and groundwater level fluctuations


Pump "Off"

(Operating vacuum is reached)

Alarm "On"

(Leak exceeds pump capacity)


VLX 30

1.2 + 0.25 psi

0.7 + 0.25 psi

Not for use where suction line is mounted on top of tank.

VLX 350

6.6 + 0.4 psi

5.4 + 0.3 psi

Tank diameter cannot exceed 10 feet 6 inches unless the suction line is mounted at lowest point in the interstitial space.

VLX 400

7.4 + 0.4 psi

6.1 + 0.3 psi

Tank diameter cannot exceed 12 feet unless the suction line is mounted at lowest point in the interstitial space.

Functional and operational safety tests must be performed annually in accordance with manufacturer’s instructions.

Interstitial space is tested continuously.
System is connected to the interstitial space by a suction line and a pressure measuring line.
Vacuum is generated by an integral pump and is measured and controlled by a pressure switch.
This system may not be compatible with all secondarily contained tanks and/or piping. Always consult with the tank and/or piping manufacturer and the manufacturer’s applicable recommended installation practices before installing this system, or damage may be caused to the tank or piping by its use.

SGB (Sicherungsgeratebau GmbH)

Evaluator:  TUV (Technischer Uberwachungs-Verein Nord e.V.)

Hofstrabe 10

Date of Evaluation: 05/24/02

57076 Siegen, Germany


Tel:  +49/ (0) 271 / 48964-0





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