Measurement device, measurement system, canister and measurement method

摘要

A device calculates level of a liquid through detecting the liquid- gas transition point with an array of temperature sensors mounted externally of the liquid container and extending from a first to a second location on the canister. A subset of detected temperatures is identified and the liquid level determined through the position of the subset of temperatures. The first position may be at or near the bottom or empty level of the canister and the second may be at or near the top or full level of the canister. The level may be determined by definition of a subset as having an average deviation above a threshold value away from the canister average. The detection circuitry makes periodic measurements of each sensor and the delay may differ based on proximity to the last known level. A rate of consumption may be obtained based on current of historical usage and this may be communicated to the user via a visual display, along with current level etc.