So what do a spider and an ultrasonic level transmitter have in common? Nothing really; however, ask the people at the City of San Jose, CA Water department and they will gladly explain. 
It turns out that spiders were making a very comfortable home nests of dense spider webs) on their ultrasonic level transmitters used for Open Channel Flow on a Palmer Bowlus Flume. This was causing inaccurate readings and playing havoc with their control system .......... Princo to the rescue. An L4660-SEP-38N2 (2 wire) SmartSonic Open Channel Flowmeter was delivered FREE, on an evaluation basis, to verify that it would perform under these adverse conditions. After 1 year of evaluation the unit has exceeded all of the City’s expectations even with their creepy friends. So much so that the City of San Jose has recently purchased 25 additional SmartSonic Flowmeters. In conclusion, Princo's SmartSonic Open Channel Flowmeter has been field proven to function well in very adverse conditions; even with spider nests on the surface of the sensor. | 
