Sealing valve for a sensor

A sensor comprising:

• a sensor head assembly comprising a detector body;
• a sensor cartridge held by the detector body of the sensor head assembly, the sensor cartridge comprising a sensor opening and a sensing element, the sensing element being exposed by the sensor opening to an environment;
• and
• a sealing valve mounted to the detector body of the sensor head assembly, the sealing valve comprising:
• a housing having a first end, a second end opposite the first end, and an internal channel therebetween, the first end of the housing being configured to be mounted to the detector body of the sensor head assembly, the second end of the housing comprising a housing opening that is directly open to the environment and fluidly communicates with the internal channel for enabling a liquid to enter the internal channel;
• and
• a float element configured to float along a surface of the liquid, the float element being held in the internal channel of the housing such that the float element is configured to move within the internal channel between an open position and a closed position, the float element being in direct contact with the sensor opening to close the sensor opening to the internal channel when the float element is in the closed position, the sensor opening being open to the internal channel when the float element is in the open position, the float element being configured to rise with the surface of the liquid within the internal channel toward the closed position.