Level gauge with positive level verifier

A level detector with positive verification for verifying the ability to detect a high level of a material in a tank comprising:

• a housing having an electromagnetic signal emitter emitting an electromagnetic signal in the direction of the material and an electromagnetic signal receiver receiving electromagnetic signals reflected from the material;
• a mount to support the housing;
• a movable shaft passing through the mount;
• and
• an electromagnetic signal target coupled to the movable shaft and remotely moveable from a first position not between the electromagnetic signal emitter and the material, to a second position between the electromagnetic signal emitter and the material to reflect the electromagnetic signal to the detector at approximately the same intensity that the material reaching the high level would reflect.

A method of verifying that a high level alarm based on electromagnetic energy reflected from a material in a tank will be triggered when the material reaches a high level corresponding to the high level alarm, comprising:

• determining a level of the material in the tank by emitting electromagnetic energy towards a surface of the material and measuring the reflected electromagnetic energy received at a detector;
• positioning a remotely positionable target-between the emitter of the electromagnetic energy and the material so that the target reflects electromagnetic energy to the detector at approximately the same intensity that the material reaching the high level would reflect;
• and
• confirming the high level alarm is triggered.

A safety level limit verifier for verifying a safety limit in a tank containing a material comprising:

• a movable rod having a proximal end outside the tank and a distal end inside the tank;
• a target adapted to reflect electromagnetic waves at approximately the same intensity that the material reaching the safety level limit would reflect coupled to the distal end;
• and
• a mountplate holding a radar level gage and a coupling sized to seal with the movable rod and to allow the movable rod to do at least one of rotating or sliding.