Fire extinguisher pin pull sensor

A pin pull sensor assembly for a fire extinguisher including a handle to operate the fire extinguisher, the handle including a pin positioned to prevent the handle from operation such that arming the fire extinguisher requires removal of the pin, the pin pull sensor assembly including:

• an aperture for accommodating an end of the pin that is removeable from the fire extinguisher handle to arm the fire extinguisher;
• a biased cam arrangement that is moveable between:
• a first position in which:
• the end of the fire extinguisher pin resides in the aperture,
• a first cam element of the cam arrangement is biased towards the aperture and abuts against the inserted pin which resides in the path of the first cam element, and
• a second cam element of the cam arrangement is positioned to enable a device for detecting movement of the cam arrangement to detect when the cam arrangement is in the first position, and
• a second position in which:
• the end of the fire extinguisher pin is removed from the aperture, and
• the second cam element is positioned to enable the device for detecting movement of the cam arrangement to detect that the cam arrangement is not in the first position;
• and
• wherein the cam arrangement is biased toward the second position such that the cam arrangement is caused to move from the first position to the second position when the end of the pin is removed from the aperture, thereby enabling the device for detecting movement of the cam arrangement to detect that the cam arrangement is not in the first position.