Disclosed is a urea injection device for a selective catalyst reduction device. The sensor comprises an ultrasonic transmitter for transmitting ultrasonic waves at an ultrasonic operating frequency, and a controller that drives the transmitting circuit with complementary drive signals to control the ultrasonic operating frequency. The gasket tabs can resist a force exerted by a pressurized fluid within one or both of the first and second housing members. An alarm may be generated if an alien device appears to be present. The data transformation system can also enhance older versions of data stored in the system or exclude portions of data from reports.