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| We need to build or buy economical submersible pressure transducers |
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| viper:
We are working on a small volume product where we need to monitor the pressure of water. The problem is the sensor, cable, etc, needs to go into the hole. This seems the change the price radically, by a factor of 100 for stuff that we can find. For this reason, we have considered trying to just source PCB transducers and we will build the housing system. That is assuming affordable sensors cannot be found. We need to read pressures to about 250psi at the very max, but typically only 100psi. I am curious if anyone knows where to shop for either the PCB unit, or complete sensor unit? Yes, places like Omega have them, but at prices that are beyond the entire budget for the sensor alone. As for accuracy, really about 1% is more than fine for this. Any added resolution is great, but right now we are focused on price, and reliability as driving factors. |
| SmallCog:
Druck make the sensor module used in their own units as well as their competitors https://in-situ.com/en/level-troll-500-data-logger Reading between the lines it sounds like you're making a similarly submersible (irrespective of function) product. Perhaps see if Druck will sell you the modules too? PM me if you want to see inside the InSitu unit I've got a dead one I cut open to see what was inside |
| viper:
Thanks! You bet, i'd love to see the inner workings to get some ideas. However, we don't really need data logging inside the sensor as such. Design could go a different way though. Certainly don't need a titanium housing for our needs though. Appreciate the feedback. Seems very tough to find what we need. I thought about reaching out to Honeywell tomorrow as well as Delphi. Actually Delphi was quite receptive in years back on another project. |
| DC1MC:
A price range will be nice, there are no heap submersible sensors at this range of pressures, but maybe the chinesium ones are good enough: https://www.robotshop.com/de/en/bar100-high-resolution-1000m-depth-pressure-sensor-r2.html |
| viper:
Thread in water and oil pressure sensors in stainless housings can be bought for less than $10 at retail. FF to "submersible", and we are talking $1000. What I conclude from that is the electronics and/or transducer sections are probably similar, but you need a housing and such to seal everything. That is something we can handle, but would like to purchase the electronics/sensor. We intend to read the sensor data remotely via a long sealed cable. We have played with the retail sensors and though we can make them work, we are left to dismantle and hack sensors. It would be much easier to simply buy the sensor and PCB inside of one of these and construct our own sensor. Obviously all of this is assuming we cannot store buy a sensor to suit our needs. As for target price, we don't have a firm number on that but south of $100. We are also in the manufacturing biz so designing/building the housing is really not a concern, but I don't like remaking the wheel. I'd be open to just designing a custom PCB for the sensor unit but then we are taking on another task to build the sensor complete, calibrate it, etc. Rather buy if we can. |
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