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I purchased the sensor from an Indian Company called "Monad Electronics". I had some discussions with them before purchasing . They were confidently telling that I can get 5cm resolution for the 50 Mts sensor. They even sent a photograph of one installation they made. Now they say that they do the calibration combined with their digitizer. For eg if the depth is 10 meters, they will adjust the equipment to show 10 meters. Then I asked how they will handle atmospheric pressure variation. They say by the following methods.I would say that is correct.
Post your records we may be able to help.
E
If you have an atmospheric pressure sensor as well as a non-vented water-depth pressure sensor that should be possible. Is your depth sensor the type that is vented to atmosphere, as Eric mentioned in post #11?Is it true that such external variations which are unpredictable in nature can be compensated with the 5 steps mentioned above?
No.Is your depth sensor the type that is vented to atmosphere, as Eric mentioned in post #11?
Thank you very much.hi,
I would say without some direct method for correcting for atmospheric pressure, their 5 methods sound doubtful to me.
Look at this PDF, its the PTX type I have use, I have marked a clip showing the required air vent pipe that is within the connecting cable.
E
The readings I got are given below.If you have an atmospheric pressure sensor as well as a non-vented water-depth pressure sensor that should be possible. Is your depth sensor the type that is vented to atmosphere, as Eric mentioned in post #11?
Thank you.Use the Snipping tool in Windows Accessories. Save it as a .png
Yes. Fluke multimeter.Is this a voltmeter that reads to 2000 mV?
I am using a stable reference voltage. But here I am checking the voltage directly with the multimeter.What are you using for a reference? V+/2 or a stable reference or something else?
I will try to remove spikes.If it is, then some filter capacitors on the output of the power supply may help.
Don't think so, but still will check again.Could the DVM suffer from warm up drift?
I found my ADC output also changing in the same way.Do you have a better DVM, maybe 4 1/2 digit, which you could try?
I used a 4" of pipe 3Ms height filled with water for testing purpose. The sensor is kept inside. Water level is kept constantWas the pressure transmitter in the water?
Did the water level stay constant?
Were there any ripples (waves) on the water surface?