Connector mechanism for a sensor

A sensor assembly, the sensor assembly comprising:

• a mounting structure;
• and
• a sensor configured to be mounted to the mounting structure such that the sensor is exposed to an environment, the sensor including:
• a sensor head assembly, the sensor head having:
• a detector body with an internal channel and an open distal end, the internal channel having a longitudinal axis;
• and
• a sensor head attachment connector (sensor HAC) located within the channel, the sensor HAC oriented to face the distal end, the sensor HAC recessed within the channel remote from the distal end, the sensor HAC including a first electrical connection having at least a first contact member, the sensor HAC including a first key component that is located in a fixed location relative to the first contact member;
• and
• a sensor cartridge, the sensor cartridge having:
• a cartridge housing that includes a probe component, the cartridge housing configured to be at least partially inserted through the open distal end into the internal channel of the detector body;
• a second electrical connection having at least a second contact member configured to mate with the first contact member;
• and
• a second key component that is located in a fixed location relative to the second contact member, the first and second key components being configured to engage one another before the first and second contact members engage one another, the sensor cartridge being configured to be rotated about the longitudinal axis of the internal channel, when the sensor cartridge is within the internal channel, to align the first key component and the second key component with each other, the second key component being configured to interlock with the first key component, the first and second contact members being longitudinally blocked from engaging one another until the first and second key components are aligned.