Managing anhydrous ammonia tanks comes with high risks for both personnel health and process safety reasons. Ammonia can be a very difficult compound to measure reliably due to its tendency to change between its liquid and vapor states. The implemention of accurate and reliable level measurement is critical to ensure process safety. Heavy vapors can attenuate the signal from non-contacting radar and limit its overall range capability, therefore a Guided Wave Radar Level Transmitter for tank level control and overfill prevention is the recommended choice.