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Home > Echotel® 961 Full Featured Single Point Ultrasonic Level Switch
 Echotel® 961 Full Featured Single Point Ultrasonic Level Switch   Printer Friendly Version
Increasing demands for compliance with safety systems and overfill protection has mandated more reliable point level measurement. Echotel® Model 961 Ultrasonic Level Switches meet these demands with advanced transducer designs, extensive hazardous location approvals, and a new self-test technology.

Model 961 offers the ultimate solution to reliable single point liquid level measurement. This advanced switch uses pulsed 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.

The Echotel 961 is equipped with advanced diagnostics that continuously check the sensor and electronics.The diagnostics also alarm for electrical noise interference from external sources.
Operating Principle Features Industries Options Downloads Approvals
 
Model 961 switches utilize ultrasonic energy to detect the presence or absence of liquid in a single point, tip-sensitive transducer. Ultrasonic contact level technology uses high frequency sound waves that are easily transmitted across a transducer gap in the presence of a liquid media, but are attenuated when the gap is dry.

Model 961 switches use an ultrasonic frequency of 2 MHz to perform this liquid level measurement in a wide variety of process media and application conditions.

The transducer uses a pair of piezoelectric crystals that are encapsulated in epoxy at the tip of the transducer. The crystals are made of a ceramic material that vibrates at a given frequency when subjected to an applied voltage. The transmit crystal converts the applied voltage from the electronics into an ultrasonic signal. When liquid is present in the gap, the receive crystal senses the ultrasonic signal from the transmit crystal and converts it back to an electrical signal. This signal is sent to the electronics to indicate the presence of liquid in the transducer gap. When there is no liquid present, the ultrasonic signal is attenuated and is not detected by the receive crystal.

 

  • No calibration
  • Loop current or relay output
  • Advanced diagnostics: sensor, electronics and electrical noise interference
  • LED indication for alarm status and error
  • Pushbuttons for manual testing of output
  • Metal and plastic sensors
   

  • ATEX II 1G EEx ia II C T5, intrinsically safe
  • ATEX II 1/2 G EEx d II C T6, explosion proof
  • TÜV WHG §19 (pending)
  • VLAREM II - 5.17.7 (pending)
  • FM/CSA Non-incendive, I.S. and XP
  • FSTS / RosTechnadzor (pending)
 
 Literature: (US English)
  Sales Literature
  Instruction Manual
  SIL Brochure
  Technology Brochure
  Test Report FMEDA 961 AC DC
  Test Report FMEDA 961 Loop
  Test Report FMEDA 962 AC DC
  Test Report FMEDA 962 Loop
  Instruction Manual

  
  • XP   

  • IS   

  • NI   
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  • XP   

  • IS   
  • NI   
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  • ELV   
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  • XP   

  • IS   

  • NS   

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  • YES   
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  • YES   
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    XP = Explosion Proof  •  IS = Intrinsically Safe  •  NI = Non-Incendive  •  NS = Non-Sparking  •  ELV = EMC/Low Voltage