A temperature sensor (14, 114, 214, 314, 414, 514) for use in an industrial process temperature sensor assembly (10, 110), the sensor comprising: a temperature probe including a temperature sensing device disposed at a temperature probe tip; an adapter (26, 126, 226, 326, 426, 526) surrounding a portion of the temperature probe, the temperature probe being movable within the adapter (26, 126, 226, 326, 426, 526) in a lengthwise direction, the adapter (26, 126, 226, 326, 426, 526) including: a housing connection end for connecting to an electrical housing; a thermowell connection end for connecting to a thermowell; a cavity wall that defines a cavity that extends through a portion of the adapter in an axial direction from the thermowell connection end; a resilient device adapted to produce a force between the adapter (26, 126, 226, 326, 426, 526) and the temperature probe, the force being variable based on a position of the temperature probe within the adapter (26, 126, 226, 326, 426,526); the sensor characterized by a viewing port radially extending through the cavity wall of the adapter (26, 126, 226, 326, 426, 526) through which a portion of the temperature probe within the cavity is visible; and a flame path wall that extends from the cavity toward the housing connection end and which is positioned between the housing connection end and the viewing port; and a visual indicator disposed on a surface of the temperature probe, wherein visibility of the visual indicator through the viewing port corresponds to a desired force produced by the resilient device. a temperature probe including a temperature sensing device disposed at a temperature probe tip; an adapter (26, 126, 226, 326, 426, 526) surrounding a portion of the temperature probe, the temperature probe being movable within the adapter (26, 126, 226, 326, 426, 526) in a lengthwise direction, the adapter (26, 126, 226, 326, 426, 526) including: a housing connection end for connecting to an electrical housing; a thermowell connection end for connecting to a thermowell; a cavity wall that defines a cavity that extends through a portion of the adapter in an axial direction from the thermowell connection end; a resilient device adapted to produce a force between the adapter (26, 126, 226, 326, 426, 526) and the temperature probe, the force being variable based on a position of the temperature probe within the adapter (26, 126, 226, 326, 426,526); the sensor characterized by a viewing port radially extending through the cavity wall of the adapter (26, 126, 226, 326, 426, 526) through which a portion of the temperature probe within the cavity is visible; and a flame path wall that extends from the cavity toward the housing connection end and which is positioned between the housing connection end and the viewing port; and a visual indicator disposed on a surface of the temperature probe, wherein visibility of the visual indicator through the viewing port corresponds to a desired force produced by the resilient device. a housing connection end for connecting to an electrical housing; a thermowell connection end for connecting to a thermowell; a cavity wall that defines a cavity that extends through a portion of the adapter in an axial direction from the thermowell connection end; a resilient device adapted to produce a force between the adapter (26, 126, 226, 326, 426, 526) and the temperature probe, the force being variable based on a position of the temperature probe within the adapter (26, 126, 226, 326, 426,526); the sensor characterized by a viewing port radially extending through the cavity wall of the adapter (26, 126, 226, 326, 426, 526) through which a portion of the temperature probe within the cavity is visible; and a flame path wall that extends from the cavity toward the housing connection end and which is positioned between the housing connection end and the viewing port; and a visual indicator disposed on a surface of the temperature probe, wherein visibility of the visual indicator through the viewing port corresponds to a desired force produced by the resilient device.