ASF Leak Detector Type D9 R325 / D9 R255 - Pressure Principle - Overview

Application

To monitor double-walled tanks.
Container types according to DIN EN 12285-1 (DIN 6608 Part 2), DIN EN 12285-2 (DIN 6616 Form A), DIN 6619, Part 2, DIN 6623, Part 2, DIN 6624, Part 2.
No permeation may pass through the inner tank wall into the interstitial space.Non-standard containers with a general building inspectorate approval.
For monitoring of water-polluting liquids, including flammable liquids with a flash point < 55°C.
The storage medium must not exceed the density allowed for the container.
The leak detector can be used for monitoring one or several underground tanks utilizing an appropriate manifold system.

The leak detector must be mounted outside the hazardous area (ex-zone)!

Product images

Operating Conditions

The interstitial space of the container must be designed for the max. operating pressure of the leak detector.
For Type D9-255: Alarm switching value (255 mbar), allowed operating pressure in the interstitial space minimum 0,4 bar.
For Type D9-325: Alarm switching value (325 mbar), allowed operating pressure in the interstitial space minimum 0,5 bar.
Leak detection fluid may not be present in the interstitial space of the container.
The containers must be operated pressureless.
Appropriate manifolds together with a D9 leak detector may only be used for monitoring underground tanks.

Accessories

Installation of a potential free relay
Installation in protective casing with exterior alarm and heating. (See product image)

Function

Leak detector according to the principle of positive pressure with integrated pump and pressure relief.
The outside air is sucked through a vessel with dry beads (air dryer), which dries the air down to a relative humidity of <10%.
The saturation of the dry beads, depending on the humidity, is reached in about 12-15 months, identifiable by the color change, - initially orange - colorless at saturation.

Operating Pressure

in the interstitial space < 490 mbar

Switching Values: relative pressure