A differential monitoring system of carbon dioxide levels within an associated building with a monitoring zone including a quantity of captured carbon dioxide and a reference zone that is spaced away from the monitoring zone. The differential monitoring system includes a first carbon dioxide monitoring inlet disposed within the monitoring zone. A second carbon dioxide monitoring inlet is disposed within the monitoring zone in spaced relation to the first carbon dioxide monitoring inlet and/or is disposed within the reference zone in spaced relation to the first carbon dioxide monitoring zone. A controller is operable to determine when a carbon dioxide level at the second carbon dioxide monitoring inlet exceeds a carbon dioxide level at the first carbon dioxide monitoring inlet by a predetermined differential threshold. The inlets can be part of an aspirated sampling system and/or part of a distributed sensor system. Methods of monitoring carbon dioxide levels are also included.

The invention relates to a test chamber and to a method for operating a test chamber for conditioning air, in particular a temperature control chamber, a climate chamber or the like, the test chamber comprising a temperature-insulated test space, which can be sealed from an environment and serves to hold test material, and a temperature control device for controlling the temperature of the test space, the temperature control device being configured to establish a temperature in a temperature range of −50° C. to +180° C. within the test space, the temperature control device having a heating feature and a cooling feature with a cooling circuit with a refrigerant, a heat exchanger in the test space, a compressor, a condenser and an expansion member, the refrigerant being a hydrocarbon or a refrigerant mixture of hydrocarbons, the test chamber being provided with a machine room physically separated from the test space, the cooling circuit with the compressor being at least partially disposed in the machine room. The test chamber comprises a ventilation system having a detector with at least one gas sensor for detecting refrigerant in the test space, the ventilation system comprising a fan and an exhaust duct, the exhaust duct being connected to the test space in such a manner that the fan can transport air from the test space into the exhaust duct, the fan comprising a fan motor and a fan impeller, the fan motor being disposed in an air-tight enclosure, or the exhaust duct being connected to the test space and the machine room in such a manner that the one fan can transport air from the machine room and the test space into the exhaust duct.

This application provides a leakage detection apparatus and a leakage detection method, to perform leakage detection on a heat exchanger core. The leakage detection apparatus includes a gas releaser, a gas sensor, and a controller. Both the gas releaser and the gas sensor are communicatively connected to the controller. The gas releaser is configured to provide tracer gas to a first flow channel of the heat exchanger core. The gas sensor is configured to: detect a tracer gas concentration in a second flow channel of the heat exchanger core, and feed back the tracer gas concentration to the controller. The controller is configured to compare the tracer gas concentration detected by the gas sensor with a concentration threshold. If the tracer gas concentration is greater than the concentration threshold, the controller determines that a leakage point exists in the heat exchanger core.

An information handling system includes a liquid cooling system and a coolant leak detector. The liquid cooling system circulates chilled coolant liquid to a component of the information handling system. The coolant liquid includes a fluorescent dye that emits light at a particular wavelength when the fluorescent dye is illuminated. The coolant leak detector system includes a light source, and a detector configured to detect light at the first wavelength. When the liquid cooling system develops a leak, the light source illuminates the first fluorescent dye in the leaked coolant liquid, the detector detects the light at the first wavelength, and the coolant leak detector provides an indication that the liquid cooling system has developed a leak in response to detecting the light at the first wavelength.

A leakage prevention system including a cold plate is proposed in the current application. In one embodiment, a cold plate comprises an inlet port to receive cooling fluid from an external cooling source; an outlet port to return the cooling fluid back to the external cooling source; a sealing notch integrated with a sealing pad included in an outside layer of the cold plate; a nanoparticle channel disposed inside the outside layer; the nanoparticle channel is filled with a plurality of nanoparticles; a cooling area disposed inside the nanoparticle channel; the cooling area is to receive the cooling fluid from the inlet port, to exchange heat generated by an electronic device attached to the cold plate and carried by the fluid, and to return the cooling fluid via the outlet port; the plurality of nanoparticles in cooling fluid is used to detect a leakage of the cooling fluid.

A multi-layer seal formed with a first layer for visual detection of leak by incorporating coloring agent that is water soluble, a second layer for electrical detection of a leak by a sensor, the second layer incorporating disbursable agent which disburses into the water upon contacting water and causing a change in chemical, and/or electrical property of the water, and a third layer made of water swelling material which swells upon contact with water. The three layers may be arranged in an orientation wherein a leak would first reach the first layer, then reach the second layer, and lastly reach the swelling layer. The sealing layer arrangement may be correlated to the fluid flowing direction. The layers may form independent parts placed side-by-side or may be integrated into a single seal loop.

An inspection system is configured to inspect the condition of a braze joint formed within a structure, wherein the braze joint is formed from a braze filler material having a tracer material disposed therein. The inspection system includes an energy source for directing energy towards the structure, an energy detector for detecting information regarding the structure following interaction with the energy directed from the energy source, and a data analysis system for analyzing the information detected by the energy detector. The data analysis system is configured to distinguish the tracer material from the remaining materials forming the structure in order to determine a suitability of the braze joint.

An HVAC system is provided having an air supply system, a refrigerant circuit configured to condition air in the air supply system, and an electrochemical sensor configured to detect a refrigerant leak from the refrigerant circuit.

To provide a method for inspecting a gas leak from a fuel cell stack, whereby a leak position can be easily identified in a short time. A method for inspecting a gas leak from a fuel cell stack includes a preparation step of arranging stacked end faces of the fuel cell stack so as to be exposed on a side surface, a jig installation step of installing an inspection jig including a space for detecting the gas leak from the side surface so as to cover the side surface, a gas leak measurement step of detecting the gas leak with a gas sensor arranged in an upper part in the space, and a position identification step of identifying a leak position in a height direction from a detection start time of the gas sensor.

Various methods and apparatuses are provided for monitoring and detecting gas leaks. A method of determining a gas leak with a sensor assembly is provided. The sensor assembly includes a primary sensing device and a reference sensing device. The method includes receiving, via the primary sensing device, a first oxygen concentration level reading of a given area. The method also includes receiving, via the reference sensing device, a second oxygen concentration level reading of the given area. The method further includes comparing the first oxygen concentration level reading and the second oxygen concentration level reading. Based on the comparison, the method still further includes causing a transmission of a signal that a gas leak is occurring in an instance in which the first oxygen concentration level reading and the second oxygen concentration level reading have a difference greater than a threshold difference. A corresponding gas detection apparatus is also provided.