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Manifold Water Leak Detect Methodology Disclosure Number: IPCOM000236268D
Publication Date: 2014-Apr-16
Document File: 5 page(s) / 503K

Publishing Venue

The Prior Art Database


Disclosed is a leak detection methodology for a central electronic complex that applies Nano Porous Thin Film Sensor technology to facilitate early detection and response to a leak event.

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Manifold Water Leak Detect Methodology

Recent server system design and architectures have driven the need for more challenging structures to be developed to cool high-power processor chips. An

example of this a central electronic complex (CEC) having a horizontal drawer configuration comprising a multiple (e.g., six) distributed processor single chip module (SCM) watered cooled via an intra-drawer manifold system. (Figures 1 -3) Contrary to past systems that implemented brazed "rigid" tube manifold assemblies, the manifold assembly for some architecture is required to facilitate both SCM and manifold field replacement (FRU) ability. To accomplish this, the manifold has been constructed using both fixed (brazed) tube joints as well as flexible hoses joined via barbs and clamps.

As such, by its construction, installed orientation, and by the assembly's catastrophic damage sensitivity due to water leakage, a leak detection methodology applying Nano Porous Thin Film Sensor technology has been conceived to address early detection and response to such an event. This methodology not only includes the hardware and sensor aspects, but the equally important reference sensory capability (i.e. local vs. global humidity compare) and interactive system controls to address potential server usage and service actions as required.

Figure 1: CEC Front Iso View

Figure 2: CEC Rear Iso "Exposed" View


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Figure 3: CEC Exploded View (Full Manifold FRU)

The leak detection methodology is comprised of both hardware and software to provide a holistic implementation. From the hardware perspective, the fundamental building block is the application of a Nano Porous Thin Film Sensor. Note, conceptually, other leak detect sensor technologies could be employed with a similar system feedback and controls methods (e.g., ceramic based sensors, etc.). Originally developed for the


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nuclear industry, this sensor technology provides a measure of relative "local" humidity via a change in the capacitance (ref. Fig 4 and

By their nature, these sensors have the ability to accurately detect moisture with a leak rate of 0.1 grams per min. Unlike usage in prior art which applied these continuously along a pipe, the concept promoted here applies these across suspected high-risk areas and/or mechanical joints (e.g., clamped hose and barb locations, etc.). This enables both strategic monitoring and leak detection isolation.

The sensor leads are used for electrical monitoring. (Figure 4) These are bundled and connector-ized to the CEC processor board to facilitate polling by the anticipated firmware. An additional hardware element can be a "local" absorbent wrap to encapsulate the sensors. The wrap's material can provide both a wicking effect, locali...