Compressed fluid vessel monitoring apparatus and method

An apparatus for monitoring a vessel retaining a compressed fluid, the apparatus comprising:

• a tracking device comprising a collar body that is attachable to a body of the vessel retaining the compressed fluid wherein the collar body comprises a plurality of sidewalls that are removably coupled together by a releasable attachment mechanism;
• and
• the tracking device having a wireless transmitter device configured to wirelessly transmit data or a signal to indicate the vessel is empty in response to the vessel being determined to be empty or within a pre-selected emptiness threshold;
• the plurality of sidewalls defining an upper opening, a bottom opening, and a cavity, the cavity being in communication with the upper opening and the bottom opening to retain a portion of the body of the vessel therein;
• an indicator element positionable within a slot of the collar body or on the collar body, the indicator element having at least one indicia for indicating a status of the vessel, the indicator element being moveably attached to at least one of the sidewalls so that the indicator element is moveable to adjust which of the at least one indicia is viewable from the slot;
• the at least one indicia being positioned on an exterior side of the indicator element opposite an interior side of the indicator element, the at least one indicia including an empty indicator:
• the wireless transmitter device positioned so that the wireless transmitter device transmits the data or the signal to indicate the vessel is empty via engagement with a positional indicator positioned adjacent to the slot and/or the indicator element that is creatable while the empty indicator is viewable from the slot.