Thank´s jaydee116.
It did not think to me that it go to interest so much the graphs. When I did the first tests it does already a time, I did not give much importance him, but obvious he is interesting.
If they are interested I can continue testing. I have other three sensors at the moment installed in the PC, if I can I will try simultaneously to test with the 4 sensors to different distances and possibilities.
Also to the next one instead of leaving to the pump working several seconds, I will try that only the water hammer takes place to see what it happens. And I will try to make more things to see than it is what it happens, to give a blow in the silicone tube etc.
The collection of data I have it selected for every millisecond, although normally for temperatures and pressures I use readings every second. But also I have tested in 5msec and also enough noise exists.
I have not proven to raise more, but the resolution will lower enough. A second would be very many time, would not see anything. Ground not to use the system for this type of measurements and I have not worked the form to avoid it.
I can try to use another tool of software to test.
It is necessary to consider that the system that I use.
The data logger itself, (the rest of the box has electronics of conditioning signal and power supply), is really simple. It was damaged to me and when repairing it I could see that all the components are SMD, has very few and main and most expensive one, the ADC of 10 Bits, only costs 4€. It does what can.
I do not believe that the offered answer is influenced by the mechanical resonance of the sensor, has a maximum response time of 1msec, and also that the time stabilization I don´t believe isn´t very different from that. In addition, 2.55m of length for 50msec and 1.67m of length for 33msec of delay agrees in proportion.
I am not sure of which can be the reason or the set of them that cause it, and until point the effect hammer it can influence the measurements in a circuit of this type or a pump, inertias.
The advantage like you have commented of the piezoresistives sensors is that they have a very fast answer but also they are more sensible to the noise. I had of series 26PC without amplifying and ratiometric output, based on an enough bridge of Wheatstone and I had problem of noise/stability with him. It is of more delicate use.
Here all the channels at the moment configurated, 11 and the rest virtual for several calculations can be seen. Obvious, normally nonworking with all simultaneously.
Some do not work well, because two pressure sensors are desconected for for the current test. I have installed a Aqua Computer Culpex Pro to test.
If are interested I can do commentaries on them, but in another message.
Also a long time ago I tested with sensors of vibration placing them in the pump, but I did not finish testing serious. Concretely I used this sensor.
Also I have another one of mechanical pressure to do a balance to me for little weight with enough resolution. In that I have thought to use for the test bench of water blocks. It is an interesting field.
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It depends of sensors obviously, yours are "cheap" ones with a special technology (piezo) and got their own pros/cons. I worked with high pressure sensors for military and civilian applications (A380, rocket...) to calibrate them within shock tubes in order to get the true response, and for that, sampling is done at ultra high speed ($$$ material) to get millions of data in only some milliseconds (violent shockwave is generated to hit sensor), but these sensors aren't cheap at all obviously
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I believe you, know persons that are employed at A380
