Abstract: In order to enable the inside of a constant-temperature device to be sterilized using sterilization gas and prevent contamination during incubation, even when provided with an atmosphere measuring means having a CO2 sensor and an oxygen concentration sensor, a sensor unit (100) is arranged inside or close to an incubation chamber, and the internal atmosphere is measured by sucking-in the atmosphere of the incubation chamber (2) by means of an air-flow generation means (20). Furthermore, high-precision filters (23, 24) are arranged in the flow channel through which the atmosphere within the incubation chamber (2) is taken-in/discharged, preventing bacteria and/or cells from flowing in, and also preventing the diffusion of sterilization gas to the inside of a sensor unit (100) during sterilization.

Abstract: In order to enable the inside of a constant-temperature device to be sterilized using sterilization gas and prevent contamination during incubation, even when provided with an atmosphere measuring means having a CO2 sensor and an oxygen concentration sensor, a sensor unit (100) is arranged inside or close to an incubation chamber, and the internal atmosphere is measured by sucking-in the atmosphere of the incubation chamber (2) by means of an air-flow generation means (20). Furthermore, high-precision filters (23, 24) are arranged in the flow channel through which the atmosphere within the incubation chamber (2) is taken-in/discharged, preventing bacteria and/or cells from flowing in, and also preventing the diffusion of sterilization gas to the inside of a sensor unit (100) during sterilization.