SNAA266A April   2015  – November 2015 TDC1000 , TDC1000-Q1 , TDC1011 , TDC1011-Q1

 

  1.   How to Select and Mount Transducers in Ultrasonic Sensing for Level Sensing and Fluid ID
    1.     Trademarks
    2. 1 Transducer Selection
      1. 1.1 What Frequency?
      2. 1.2 What Size?
      3. 1.3 Which Piezo Material?
      4. 1.4 1 MHz Transducers for Liquid Level Sensing and Fluid Identification
    3. 2 Tank Wall Transducer Mounting
      1. 2.1 Where Does the Transducer Get Mounted?
      2. 2.2 Transmitting Through a Tank Wall
      3. 2.3 Assembly Steps
    4. 3 Required Supplies
    5. 4 Tank design modifications to accommodate transducer
    6. 5 Conclusion

1.4 1 MHz Transducers for Liquid Level Sensing and Fluid Identification

For the scope of this Application Note, 1 MHz transducers will be the primary focus. In the table below are the transducers that have been tested with the TDC1000 for level sensing and liquid identification. All of the transducers are approximately 2 mm thick. This is due to the requirement of axial (thickness) resonance mode of 1 MHz for these applications. Some of these are listed on their websites referencing their radial resonance frequencies. It’s important to understand they are both correct and that care needs to be taken when selecting a transducer.

Table 1. Tested Transducers

FREQ
(THICKNESS MODE)		 THICKNESS
(mm)		 RADIUS
(mm)		 SEALED MODEL # VENDOR
WEBSITE
1 MHz 2 10 N  SMD10T2R111WL https://www.steminc.com/PZT/en/piezo-ceramic-disc-10x2mm-r-215-khz-wire-leads-smd10t2r111wl
1 MHz 2 15 N SMD15T21R111WL https://www.steminc.com/PZT/en/piezo-ceramic-disc-1-mhz
1 MHz 2 7 N BSU-P7-1000B-W200 http://www.bestartech.com/piezo-element-dia.-thickness-p-435-l-en.html
1 MHz 2 10 N BSU-P10-1000B-W200 http://www.bestartech.com/piezo-element-dia.-thickness-p-436-l-en.html
1 MHz 2 15 N BSU-P15-1000B-W200 http://www.bestartech.com/piezo-element-dia.-14.85-thickness-p-437-l-en.html
1 MHz 2 15 N AW5Y15.5200AL145 http://www.audiowell.com/en/product-detail.aspx?id=53
1 MHz 2 15 Y T/R975-US0014L353-01 http://www.audiowell.com/en/product-detail.aspx?id=58
1 MHz 2 14 N AW5Y14200A http://www.audiowell.com/en/product-detail.aspx?id=54