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We need to build or buy economical submersible pressure transducers

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viper:
Smallcog, would that wire have any markings on it, if we need to do something like that?  I've never seen that, but probably was not looking either. 

SmallCog:
InSitu make it for use with their sensors.

Vega, Druck, and others supply similar vented cables with their sensors (most are potted to the sensor, insitu use connectors)

Pretty sure insitu make their own cable in the US, not sure if the others are buying or making cable.

For the curious about why you need an air tube: https://www.sensorsone.com/vented-cable/

Zoli:

--- Quote from: viper on January 04, 2022, 10:15:40 pm ---...
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.

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--- Quote from: DC1MC on January 05, 2022, 11:42:42 pm ---
--- Quote from: Wallace Gasiewicz on January 05, 2022, 11:39:03 pm ---There are commercially available pressure and temp transducers used for fishing.
Some of these are meant to goon the "cannonball" on an outrigger and are quite sturdy.
Here is one:
https://www.ebay.com/itm/353180164887?chn=ps&norover=1&mkevt=1&mkrid=711-213727-13078-0&mkcid=2&itemid=353180164887&targetid=4580702890871448&device=c&mktype=&googleloc=&poi=&campaignid=418640321&mkgroupid=1233652283797640&rlsatarget=pla-4580702890871448&abcId=9300602&merchantid=51291&msclkid=29e7f78baa4f1cfe8750965d8027da67

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"Range: 0 ~ 30 bar"

A bit different from 0-200bar, don't you say  ;D?

--- End quote ---
30bar=435psi
I think the range is enough.
And as somebody who has experience with submersible sensors(of the expensive types), I would recommend to check the potting compound lifespan under water; some has a month lifespan fully cured.
@viper: if you want to go with the build-yourself route, for the required accuracy range I would recomend MEMS transducers, potted in PVC tubing, voltage(0-5V) or current(4-20mA) output.

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