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I'm posting this set by step setup for folks who need to perform level sensing from the bottom of a metal container. I'll turn this into an App Note eventually.
1, Read my app note on transducers to get an understanding about how transducers work, how to select them and how to mount them externally.It can be found found at: www/ti.com/lit/pdf/snaa266
2. Read my app note on how to configure the TDC1000 in a level sensing application from the bottom. I go over how transducer choices effect system design and how to configure the TDC1000. It can be found found at: www/ti.com/lit/pdf/snaa270
Here’s pics of the assembly process:
Gluing transducer to container bottom. Notes:
Apply light pressure to transducer while waiting for glue to set.
Side view showing amount of glue.
Top View showing amount of glue.
Hot gluing stage: provides transducer acoustic dampening, transducer protection, and wire strain relief
Adding 4 rubber feet to container bottom to protect the transducer
Test setup: Pot, and TDC1000-TDC7200 EVM, transducer connected to TX1/RX2 (pin 10, 11) on J5
Scope shot with level above 15 cm. Note: it is ~1V p-p, meaning higher levels are easily achievable.
TDC1000 register settings (here’s a good starting point):
Here is a graph of the TOF measurement using the demo while I’m filling it from empty to full (~16cm).
TI Comparators (CMPS) Applications Group
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Thanks for sharing this post. It is very interesting and I have some questions.
I would like to measure the fluid level of a closed metal tank from the bottom and it is about 1,5m high (500L). My first guess is the fluid level is too much and the signal may fade before reaching the surface. Since the major application of this is to detecting when the tank gets empty, I also guess I coud have some signal back when the fluid surface is reaching the bottom.
- What is the estimated maximum height for a metal tank, which inner fluid level can be measured with a TDC1000?
- What is the estimated maximum height for detecting an empty tank?
- Is the metal thickness important?
- Real industrial stainless steel containers are not usually so flat as that pot. I guess if the bottom is tilted or irregular this may affect the measurement, right?
- Industrial applications usually require more robust fixing systems than crazyglue and hot glue. Any recommendaton when it comes to industrialize this type of sensors?
In reply to Jose Ramon hernandez:
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