I was looking on the internet for some Senor´s but could not really find anything.
So I am trying it in the Forum while looking for them on the other hand.
About my small Project:
I would like to meassure the temperature in the water at different depths.
The temperature Sensor is allready found. Now i am wondering what to take: Ultrasonic or Pressure sensor and which one.
Maximum depth is 30 meter. The costs should be around 4 € each. I would like to use the Arduino zero.
Would appreciate any help i could get.
best regards,
Ramon
I was looking on the internet for some Senor´s but could not really find anything.
So I am trying it in the Forum while looking for them on the other hand.
About my small Project:
I would like to meassure the temperature in the water at different depths.
The temperature Sensor is allready found. Now i am wondering what to take: Ultrasonic or Pressure sensor and which one.
Maximum depth is 30 meter. The costs should be around 4 € each. I would like to use the Arduino zero.
Would appreciate any help i could get.
best regards,
Ramon
I would recommend a rigid tube open at the bottom and completely air tight elsewhere with a pressure sensor attached up top out of the water. as the tube descends the air pressure in the tube increases. Your temperature sensor could be attached at the bottom where the tube opening is allowing you to know what depth you are at while taking a readings. multiple temperature readings with exact depth could be easily logged as the tube descends.
I do not see how ultrasound sensor would work in you case. More details will help in knowing what is desired.
Z
zhomeslice:
I would recommend a rigid tube open at the bottom and completely air tight elsewhere with a pressure sensor attached up top out of the water. as the tube descends the air pressure in the tube increases. Your temperature sensor could be attached at the bottom where the tube opening is allowing you to know what depth you are at while taking a readings. multiple temperature readings with exact depth could be easily logged as the tube descends.
I do not see how ultrasound sensor would work in you case. More details will help in knowing what is desired.
Z
Hello Z,
I thought about a different way:
I would like to use a "Ball Housing" which is on a line but free to move. Using a plumb behind that housing to get it to the ground. in that housing there is the whole electronic in. if i give it more line i can control the height it takes. (see attached picture).
I think the temp. meassure is no problem.
But which sensor do i take for the pressure ?
Lets say up to 5 bar. costs should raise to high. waterproofed (outside where the measurement is)and already giving me a digital output (not analog so i do not need a AD Converter).
As i would like to have the electronic in the housing and only have the end of the sensor (measurement) in the water.
In that case i do not have to measure the air pressure right ?
I have just found a pressure sensor: ms5803-05ba
Does someone have experience with it ?
How can i use that in a housing ? How can i get it waterproofed without getting wrong measurements ?
That one you found is waterproof, you just need an adapter to the stainless steel collar.
okay that MPXH series look pretty good. i will check now how to implement it into my housing. and prob gonna order it afterwards.
what do you mean with "adapter to the stainless steel collar". Might be a stupid question but im still new this this. thank you for your help. appreciate it a lot !
ramon139:
okay that MPXH series look pretty good. i will check now how to implement it into my housing. and prob gonna order it afterwards.
what do you mean with "adapter to the stainless steel collar". Might be a stupid question but im still new this this. thank you for your help. appreciate it a lot !
regards
RAmon
The pressure sensor isn't capable of ingesting water! and it might be difficult sealing your electronics inside the submerged package. I Recommend using a tube any plastic tube would do. add water tight fittings to extend it and size is not a factor either a small tube will work fine.
use some 2 conductor wire to handle your temperature sensor. if it resistive Thermistor adjust for the resistance of the wire with your matching resistor to calibrate exactly.
zhomeslice:
The pressure sensor isn't capable of ingesting water! and it might be difficult sealing your electronics inside the submerged package. I Recommend using a tube any plastic tube would do. add water tight fittings to extend it and size is not a factor either a small tube will work fine.
use some 2 conductor wire to handle your temperature sensor. if it resistive Thermistor adjust for the resistance of the wire with your matching resistor to calibrate exactly.
Hey,
Yeah ive thought about that aswell.
But this is the start of my project. I want to add components afterwards which needs the housing. For example camara. So i really need the temp and pres. sensor in this housing.
but it seems like if im using the MXPH one or ms5803 i can make a cutout in the housing put it in and use some silicon (isulator, hartz..).
Could it work to add a small tube from inside the housing towards outside and put the pre. sensor inside this tube ?
ramon139:
Hey,
Yeah ive thought about that aswell.
But this is the start of my project. I want to add components afterwards which needs the housing. For example camara. So i really need the temp and pres. sensor in this housing.
but it seems like if im using the MXPH one or ms5803 i can make a cutout in the housing put it in and use some silicon (isulator, hartz..).
Could it work to add a small tube from inside the housing towards outside and put the pre. sensor inside this tube ?
A Tube would work as long as the sensor only gets air use a loop that extends up a foot or so (30cm) loops a couple times then back down to the point where you want to measure pressure at. Then have a way to blow out and clear the tube to remove any water that may accumulate in loops at top in the loops before storing. Pressure is a differential so the compartment that stores it must not compress or flex or your readings may be falty
zhomeslice:
I would recommend a rigid tube open at the bottom and completely air tight elsewhere with a pressure sensor attached up top out of the water.
I think you missed the 30-meter requirement
The newer MS5837 is specifically rated for underwater use. About the same price, better specs than the MS5803. The 05BA version should be good for 30 metres (3 bar + 1 bar atmospheric).
wvmarle:
I think you missed the 30-meter requirement
The newer MS5837 is specifically rated for underwater use. About the same price, better specs than the MS5803. The 05BA version should be good for 30 metres (3 bar + 1 bar atmospheric).
Can i use it without measuring the air pressure right ?
If i have a small opening in the housing to have the sensor directly in contact with the water, it should be enough isn t it ?
ramon139:
Can i use it without measuring the air pressure right ?
For your depths - probably no problem. The error due to air pressure difference will be very small. Be aware that there is an error, up to you whether you want to compensate for this.
If i have a small opening in the housing to have the sensor directly in contact with the water, it should be enough isn t it ?
The membrane of the sensor should be fully exposed to the water. Make sure you seal it well (epoxy works).
MorganS:
If you are measuring in lakes where the surface is not at sea level then you do need to account for air pressure at the surface.
You need some way of zeroing the depth measurement when at the surface. Easiest would be to assume it is on the surface when it is switched on.
Well i was thinking about this:
When i start my electronic it should be able to measure the air pressure. This value should be saved and set the value for the pressure item to zero. from this stage on i can calculate the pressure underwater without problems.
Guess thats possible isn t it ?
But i am still looking for the write part. because the MPXH6400A has an analog output which means i need a A/D Converter and MS5837 is quite expensive with 18 € each.
Does someone know a better solution ?
ramon139:
Well i was thinking about this:
When i start my electronic it should be able to measure the air pressure. This value should be saved and set the value for the pressure item to zero. from this stage on i can calculate the pressure underwater without problems.
Guess thats possible isn t it ?
Sure - just do that in the setup() part. The moment you switch on the device, it takes a reading - and uses that as zero for further data.
But i am still looking for the write part. because the MPXH6400A has an analog output which means i need a A/D Converter and MS5837 is quite expensive with 18 € each.
Indeed, they're pretty expensive. I'm suggesting this because of this report. The sensor is not rated for long term underwater use, yet lasts for a year. The 5837 is newer, and I found it actually is specifically suggested for underwater use by the manufacturer. So it should do the job.
Don't take the MPXH6400A to anything more than 30 meters or you're out of range - this provided the sensor can handle that much WATER pressure in the first place. The spec sheet does not mention underwater use, but I did find the remark "Media other than dry air may have adverse effects on sensor performance and long-term reliability." So I doubt it's suitable for you.
wvmarle:
Sure - just do that in the setup() part. The moment you switch on the device, it takes a reading - and uses that as zero for further data.
Indeed, they're pretty expensive. I'm suggesting this because of this report. The sensor is not rated for long term underwater use, yet lasts for a year. The 5837 is newer, and I found it actually is specifically suggested for underwater use by the manufacturer. So it should do the job.
Don't take the MPXH6400A to anything more than 30 meters or you're out of range - this provided the sensor can handle that much WATER pressure in the first place. The spec sheet does not mention underwater use, but I did find the remark "Media other than dry air may have adverse effects on sensor performance and long-term reliability." So I doubt it's suitable for you.
wvmarle:
Sure - just do that in the setup() part. The moment you switch on the device, it takes a reading - and uses that as zero for further data.
Indeed, they're pretty expensive. I'm suggesting this because of this report. The sensor is not rated for long term underwater use, yet lasts for a year. The 5837 is newer, and I found it actually is specifically suggested for underwater use by the manufacturer. So it should do the job.
Don't take the MPXH6400A to anything more than 30 meters or you're out of range - this provided the sensor can handle that much WATER pressure in the first place. The spec sheet does not mention underwater use, but I did find the remark "Media other than dry air may have adverse effects on sensor performance and long-term reliability." So I doubt it's suitable for you.
Thank you for your help appreciate it a lot!
Yeah i think 5837 is doing the job. Already asked for samples. But i think its quite expensive if i would produce it more often. So i am still looking for a cheaper one. May someone knows something ? Else im going with this one for a while
