Described herein is fluorinated dye comprising: a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group. Such fluorinated dyes are soluble in fluorinated fluids and may be used to detect leaks in various systems such as refrigerant, air conditioning and/or heat transfer systems.

Provided is a porous pellet for inclusion into an operating fluid of a fluid system for detecting sites of fluid leakage. The porous pellet comprises a solid matrix formed by at least one fluorescent dye which is solid at room temperature. The matrix has a porosity of from about 10% to about 90%. Methods of installing the porous pellets into fluid system for detection of leaks is also provided.

Provided is a porous pellet for inclusion into an operating fluid of a fluid system for detecting sites of fluid leakage. The porous pellet comprises a solid matrix formed by at least one fluorescent dye which is solid at room temperature. The matrix has a porosity of from about 10% to about 90%. Methods of installing the porous pellets into fluid system for detection of leaks is also provided.

Provided is a porous pellet for inclusion into an operating fluid of a fluid system for detecting sites of fluid leakage. The porous pellet comprises a solid matrix formed by at least one fluorescent dye which is solid at room temperature. The matrix has a porosity of from about 10% to about 90%. Methods of installing the porous pellets into fluid system for detection of leaks is also provided.

Described herein is fluorinated dye comprising: a fluorescing coumarin-derived moiety connected to an oligomer of hexafluoropropylene oxide via a non-fluorinated divalent linking group. Such fluorinated dyes are soluble in fluorinated fluids and may be used to detect leaks in various systems such as refrigerant, air conditioning and/or heat transfer systems.

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.