Increasing demands for compliance with safety systems and overfill protection has mandated more reliable point level measurement. Echotel Models 961 & 962 Ultrasonic Level Switches meet these demands with reliable transducer designs, extensive hazardous location approvals, and an advanced self-test technology. Model 961 offers the ultimate solution to reliable single point liquid level measurement. This advanced switch usespulsed signal technology for superior performance in difficult process conditions, and to provide excellent immunity from sources of electrical noise interference. Extensive self-testing of the electronics and transducer make this advanced switch suitable for use in Safety Integrity Level (SIL) 2 loops.