Abstract: A tank monitoring apparatus, having an externally protruding antenna, has the externally protruding antenna to a monitor housing with a liquid-tight compression fitting which provides a fluid-tight seal between the antenna and the housing.

Abstract: A method, apparatus, and system for remotely monitoring a liquid level in a tank are provided by broadcasting a signal indicative of the liquid level in the tank directly to a cellular communication network from a stand-alone liquid level monitor operatively attached to the tank. The stand-alone monitor is battery powered and includes a processor configured for conserving power by operating the monitor according to a periodic sampling and broadcast schedule, which may be modified by signals received at the monitor directly from the cellular communications network.

Abstract: A capacitance probe including a spacer for separating an inner conductor from an outer conductor. The spacer has a member that substantially surrounds the outer conductor and includes a number of spacing elements that extend inwardly through apertures in the outer conductor to position the inner conductor concentrically with the outer conductor. The spacers advantageously are installable from the outside of the outer conductor through apertures in the outer conductor to simplify production of the capacitance probe. The spacers also allow material to fill and drain easily between the conductors, and allow more of the material being measured to make contact with the conductors improving linearity and gain of capacitance measurement.