A liquid level measuring device

A method of measuring a liquid level in a container, including the steps of

• unspooling a line from a spool means, the line having a float attached to the end or adjacent the end thereof, such that the line moves towards the liquid level;
• detecting with a sensor a change in the tension in the line;
• and
• measuring with a measuring means the length of the line that is unspooled from the spool means when a predetermined change in tension is detected, the predetermined change is when the float has reached the liquid level in the container.

A tank for storing a liquid, the tank including

• a liquid level measuring device for measuring a liquid level in the tank, the device including
• a housing;
• a spool means mounted to the housing and movable during operation;
• a line attached to the spool means, the line windable onto and from the spool means;
• a float attached to the end or adjacent the end of the line;
• a sensor to detect a change in the tension in the line, the sensor is mounted to the housing and is operatively associated with the line;
• and
• a measuring means to measure the length of the line that is unspooled from the spool means when a predetermined change in tension in the line is detected, the predetermined change is when the float has reached the liquid level in the tank.