pressure sensors

rdmmdr · 10th May 2006, 21:26

help

looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill.
rick

Genesis · 11th May 2006, 03:33

Quote: (Originally Posted by rdmmdr)

help

looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill.
rick

Model 86 ultrastable from MSI Sensors; 1% FS span interchangability, 0.1% non-linearity., temperature compensated. Nice unit, not as small as I'd like, but I can live with it.

Would love something smaller but this one works..... requires an instrument amp as its a whetstone bridge and thus the output is differential.

Scuba_Vixen · 11th May 2006, 04:17

Quote: (Originally Posted by Genesis)

Model 86 ultrastable from MSI Sensors; 1% FS span interchangability, 0.1% non-linearity., temperature compensated. Nice unit, not as small as I'd like, but I can live with it.

Would love something smaller but this one works..... requires an instrument amp as its a whetstone bridge and thus the output is differential.

Karl, have you got a website for them, by chance?

Darlene

Genesis · 11th May 2006, 15:10

http://www.msiusa.com

DepthCharge · 12th May 2006, 23:10

Quote: (Originally Posted by Scuba_Vixen)

Karl, have you got a website for them, by chance?

Darlene

When I get some time at home, I'll post a site that has 11 bar pressure sensors at a reasonable price. I think I paid about $30 USD last year for them. What's nice about them, is that they need no calibration. From what I understand, they can actually read higher pressures, but they won't guarantee the % error.

DepthCharge · 13th May 2006, 00:51

Quote: (Originally Posted by Scuba_Vixen)

Karl, have you got a website for them, by chance?

Darlene

Just found the site. It's http://www.intersema.ch/. I got them thru servoflo, Hope this helps

Genesis · 13th May 2006, 02:49

Cool - sent some emails off. Those look nice and the digital interface is a BIG plus.

AD_ward9 · 13th May 2006, 07:42

Quote: (Originally Posted by rdmmdr)

help

looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill.
rick

We use

AD_ward9 · 13th May 2006, 07:55

Quote: (Originally Posted by rdmmdr)

help

looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill.
rick

If you have a look at the Open Revolution circuit diagrams we posted, you can see the part we use. Data sheet attached is from InterSema http://www.amsys.info/products/ms5535a.htm and works to 24 bar not just the 12 stated. Ensure you use the version that is gel filled: the standard one is open.

Be careful with alternative sensors: many fail very fast in dive applications due to either salt water or helium migrating across the diaphram. We tested the sensors we use in 140 bar helium for a month. The sensor in the data sheet worked fine at the end of that. Some sensors failed in under a minute, and it was not due to the high pressure. I recommend you test all components in this way. It can be done easily: the picture below shows the small chamber we use for this, and some boards and batteries we put inside. The chamber is rated to 600bar (6000m), so is as small as we could make it and still do the job (yes, before anyone asks, it has a safety case, with all stress figures, is tested). Here it is shown for the helium test, so is just connected to the HP port of a regulator.

cheers,

Alex

RobertSt · 13th May 2006, 10:42

Quote:

...InterSema http://www.amsys.info/products/ms5535a.htm and works to 24 bar not just the 12 stated. Ensure you use the version that is gel filled: the standard one is open.

Got any cost (estimate) on these in small numbers?
(and any resellers? (exept for the ones noted on amsys pages))

reg,

Rob

10th May 2006, 21:26	#1 (permalink)
rdmmdr designer of death Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Mar 2006 Location: kerman,california Posts: 372	pressure sensors help looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill. rick
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11th May 2006, 03:33	#2 (permalink)
Genesis Bubbless Box of Death Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Oct 2005 Location: Sunny Florida Posts: 1,453	Re: pressure sensors Quote: (Originally Posted by rdmmdr) help looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill. rick Model 86 ultrastable from MSI Sensors; 1% FS span interchangability, 0.1% non-linearity., temperature compensated. Nice unit, not as small as I'd like, but I can live with it. Would love something smaller but this one works..... requires an instrument amp as its a whetstone bridge and thus the output is differential. __________________ "A venturesome minority will always be eager to get off on their own, and no obstacles should be placed in their path; let them take risks for Godsake, let them get lost, sunburnt, stranded, drowned, eaten by bears, buried alive under avalanches - that is the right and privilege of any free American." http://www.denninger.net http://www.diversunion.org/liability.htm - Fix the Diving Cert racket
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11th May 2006, 04:17	#3 (permalink)
Scuba_Vixen e/mCCR Dolphin Pilot Current Rebreather/s: Other CCR Home Build Other Rebreather/s: Other CCR Home Build Join Date: May 2005 Location: St. Croix USVI Posts: 557	Re: pressure sensors Quote: (Originally Posted by Genesis) Model 86 ultrastable from MSI Sensors; 1% FS span interchangability, 0.1% non-linearity., temperature compensated. Nice unit, not as small as I'd like, but I can live with it. Would love something smaller but this one works..... requires an instrument amp as its a whetstone bridge and thus the output is differential. Karl, have you got a website for them, by chance? Darlene
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11th May 2006, 15:10	#4 (permalink)
Genesis Bubbless Box of Death Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Oct 2005 Location: Sunny Florida Posts: 1,453	Re: pressure sensors http://www.msiusa.com __________________ "A venturesome minority will always be eager to get off on their own, and no obstacles should be placed in their path; let them take risks for Godsake, let them get lost, sunburnt, stranded, drowned, eaten by bears, buried alive under avalanches - that is the right and privilege of any free American." http://www.denninger.net http://www.diversunion.org/liability.htm - Fix the Diving Cert racket
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12th May 2006, 23:10	#5 (permalink)
DepthCharge New Member Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Home Build Join Date: Mar 2005 Location: upstate NY Posts: 234	Re: pressure sensors Quote: (Originally Posted by Scuba_Vixen) Karl, have you got a website for them, by chance? Darlene When I get some time at home, I'll post a site that has 11 bar pressure sensors at a reasonable price. I think I paid about $30 USD last year for them. What's nice about them, is that they need no calibration. From what I understand, they can actually read higher pressures, but they won't guarantee the % error. __________________ Later, John It's better to beg forgiveness than ask permission
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13th May 2006, 00:51	#6 (permalink)
DepthCharge New Member Current Rebreather/s: Inspiration Classic Home Build Other Rebreather/s: Home Build Join Date: Mar 2005 Location: upstate NY Posts: 234	Re: pressure sensors Quote: (Originally Posted by Scuba_Vixen) Karl, have you got a website for them, by chance? Darlene Just found the site. It's http://www.intersema.ch/. I got them thru servoflo, Hope this helps __________________ Later, John It's better to beg forgiveness than ask permission
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13th May 2006, 02:49	#7 (permalink)
Genesis Bubbless Box of Death Current Rebreather/s: Home Build Other Rebreather/s: Home Build Join Date: Oct 2005 Location: Sunny Florida Posts: 1,453	Re: pressure sensors Cool - sent some emails off. Those look nice and the digital interface is a BIG plus. __________________ "A venturesome minority will always be eager to get off on their own, and no obstacles should be placed in their path; let them take risks for Godsake, let them get lost, sunburnt, stranded, drowned, eaten by bears, buried alive under avalanches - that is the right and privilege of any free American." http://www.denninger.net http://www.diversunion.org/liability.htm - Fix the Diving Cert racket
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13th May 2006, 07:42	#8 (permalink)
AD_ward9 RBW Member Current Rebreather/s: Other CCR Other Rebreather/s: Other CCR Join Date: Jun 2005 Location: Scotland Posts: 2,011	Re: pressure sensors Quote: (Originally Posted by rdmmdr) help looking for a good pressure sensor that is small and accurate.<1%error fs. 5volt exciattion amplified output and under 100.00$. i have found a can type that fiils the bill but it is to big 1 inch x 2inch. has anyone found anything that fit the bill. rick We use
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13th May 2006, 10:42	#10 (permalink)
RobertSt New Member Current Rebreather/s: Inspiration Classic Other Rebreather/s: Join Date: Mar 2006 Location: Norway Posts: 17	Re: pressure sensors Quote: ...InterSema http://www.amsys.info/products/ms5535a.htm and works to 24 bar not just the 12 stated. Ensure you use the version that is gel filled: the standard one is open. Got any cost (estimate) on these in small numbers? (and any resellers? (exept for the ones noted on amsys pages)) reg, Rob
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