Water level with the Ping)))

sensor setup was placed on top of the pipe with water in a bucket and left to rest for ten days to see if

storage in a humid environment would be a problem. After this period, we tested the Ping))) sensor and

it still operated (California is also a dry climate).

To continue with our tests, we attempted to measure the water level of boiling water (based on another

customer request). We held the operating Ping))) sensor over boiling water for a few seconds

at various

heights, and it did indeed measure the distance to the boiling water. When steam was thick (closer to

the water, and when the water was boiling hard) condensation droplets would accumulate on the

transducers; we then moved it out of steam for a minute for the droplets to dry then continued with the

test. The Ping sensor continued to operate throughout the 10-minute test. We concluded that the

Ping))) sensor could sense the surface of the boiling water, but the measurements were affected when

the cloud of steam was particularly thick.

The distance measurements through the ABS pipe were initially obtained using a ping pong ball taped to

the end of a tape measure. The ball was moved up and down the pipe in one inch increments and the

Ping))) showed accurate measurements.

Then the ten-foot pipe was inserted in a bucket of water and we moved the pipe up and down in the

bucket. Though the bucket was only a foot deep the Ping))) showed accurate readings for each inch of

movement ten feet away.