A device comprising: an evaporator; and a heat exchanger; the heat exchanger being in fluid communication with the evaporator; the evaporator comprising: an outer casing; and an inner casing that is disposed within the outer casing; the inner casing contacting a plate; wherein the inner casing encloses: a first conduit that is operative to introduce a carrier fluid into the evaporator; and a second conduit that is operative to remove the carrier fluid entrained with a precursor; wherein the outer casing is detachably attached to the plate; the plate contacting a first precursor conduit that is operative to introduce the precursor into the evaporator from the heat exchanger; where the heat exchanger comprises a second precursor conduit and an outer jacket, the second precursor conduit being in fluid communication with the first precursor conduit, and where the heat exchanger is disposed proximate to the evaporator at a distance effective to maintain a variation in temperature of the precursor in the fluid path that extends from the center of the heat exchanger to the evaporator of less than or equal to ±0.5°C when the ambient temperature around the heat exchanger and the evaporator fluctuates by an amount of up to about ± 35°C; characterized in that: the first precursor conduit contains a thermocouple that is configured to measure the temperature of the precursor in the first precursor conduit after it has left the heat exchanger, wherein the thermocouple is in electrical communication with a controller that supplies heat to the heat exchanger such that, when the temperature of the precursor varies by an amount greater than or equal to ±0.5°C, the controller communicates with heat exchanger to adjust the temperature of its heat source, which in turn adjusts the temperature of the precursor; the first conduit is an inverted U-shaped conduit that has one end in fluid communication with a first port for introducing the carrier fluid into the evaporator and an opposing end in fluid communication with a sparger; and the second conduit is an inverted J-shaped conduit that has one end in fluid communication with a second port for removing the carrier fluid entrained with a precursor from the evaporator and an opposing end in fluid communication with a splash shield. an evaporator; and a heat exchanger; the heat exchanger being in fluid communication with the evaporator; the evaporator comprising: an outer casing; and an inner casing that is disposed within the outer casing; the inner casing contacting a plate; wherein the inner casing encloses: an outer casing; and an inner casing that is disposed within the outer casing; the inner casing contacting a plate; wherein the inner casing encloses: a first conduit that is operative to introduce a carrier fluid into the evaporator; and a second conduit that is operative to remove the carrier fluid entrained with a precursor; wherein the outer casing is detachably attached to the plate; the plate contacting a first precursor conduit that is operative to introduce the precursor into the evaporator from the heat exchanger; where the heat exchanger comprises a second precursor conduit and an outer jacket, the second precursor conduit being in fluid communication with the first precursor conduit, and where the heat exchanger is disposed proximate to the evaporator at a distance effective to maintain a variation in temperature of the precursor in the fluid path that extends from the center of the heat exchanger to the evaporator of less than or equal to ±0.5°C when the ambient temperature around the heat exchanger and the evaporator fluctuates by an amount of up to about ± 35°C; characterized in that: the first precursor conduit contains a thermocouple that is configured to measure the temperature of the precursor in the first precursor conduit after it has left the heat exchanger, wherein the thermocouple is in electrical communication with a controller that supplies heat to the heat exchanger such that, when the temperature of the precursor varies by an amount greater than or equal to ±0.5°C, the controller communicates with heat exchanger to adjust the temperature of its heat source, which in turn adjusts the temperature of the precursor; the first conduit is an inverted U-shaped conduit that has one end in fluid communication with a first port for introducing the carrier fluid into the evaporator and an opposing end in fluid communication with a sparger; and the second conduit is an inverted J-shaped conduit that has one end in fluid communication with a second port for removing the carrier fluid entrained with a precursor from the evaporator and an opposing end in fluid communication with a splash shield.