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  #1  
Old 10/26/16, 6:17 PM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Any feedback on the Corentium Pro?

The Corentium Pro sells for $1500, has 4 sensors, no sensitivity rating(probably good) and supposedly is accurate to within 7% 24 hours and 5% after a week.
Sun nuclear 1028 sells for $1000, has 2 sensors, sensitivity rating in hours instead of minutes, and is accurate to within 25%.
Sun nuclear 1027 sells for $900, has 1 sensor, and is accurate to within ??

25% doesn't seem that accurate when a clients health is on the line. Does anybody have any recommendations on a quality CRM? Radstar? I would like to upgrade from canisters, which I think are accurate to within 5% (Airchek), for quicker turn around time?

Last edited by jdeoliveira2; 10/26/16 at 10:06 PM..
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  #2  
Old 10/26/16, 6:24 PM
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John A. Reim John A. Reim is offline
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Default Re: Any feedback on the Corentium Pro?

This is like debating Chevy vs Ford. Everyone will have an opinion. Take a look at Radalink and compare their equipment to those you mentioned (Sun, Radstar, etc). In Illinois, a licensed state for radon, I do believe the Corentium is in the works for approval but has not as of yet made the list?
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  #3  
Old 10/26/16, 6:35 PM
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Michael Larson Michael Larson is online now
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Default Re: Any feedback on the Corentium Pro?

There are now 3 corentium models two of which are sold as professional use.

Corentium has been playing fast and loose with their claims for years.

25% plus or minus is fine and all that is needed



As a Professional Home Inspector, I support the privacy of my clients.



www.InspectraPro.com
www.MinnesotaHomeInspector.biz

Michael Larson
Hudson, WI

Services provided in East MN and West WI

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  #4  
Old 10/26/16, 8:25 PM
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Paul Lesieur Paul Lesieur is online now
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Default Re: Any feedback on the Corentium Pro?

I own 2- 1027's, 1- Alpha 2, 1- Corentium (not the pro)

I usually set the Corentium with my calibrated and approved machines.

If I read 2.8 with the calibrated machines the Corentium is usually within 2.5 to 2.9 or so.

Corentium is now approved for their 4 sensor model.
I am picking up a test tomorrow and will post the results.
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  #5  
Old 10/26/16, 9:45 PM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Re: Any feedback on the Corentium Pro?

The Corentium Pro is listed with:
http://aarst-nrpp.com/wp/approved-devices/

The Corentium Plus isn't, so I don't get how it gets labelled for professional use. Maybe it's in that 25 % range. The 1028/7 lit says it's based on a 1987 patent. Reading the fine print it's the greater of 25% or +/- 1 pCi/l. Read another way that would be a Minimum of +/-1 pCi/. That reading would be better than nothing.

I called Corentium 3 times, emailed about documentation, nothing. E mailed NRPP directly, and they had nothing to say about any of the devices on their approved list.

The Radstar RS 300 sells for $900, if I read the documentation right 10%, sensitivity .27 cpm/pci/l.
Radalink Telemonitor no listed price on lease, 10%, sensitivity .33 cpm/pci/l
Radalink Aircat no listed price on lease, no information %, sensitivity .42 cpm/pci/l
Yes, everyone has an opinion, but it would be good to base it on facts.

Thanks Paul for the info.
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  #6  
Old 10/27/16, 11:11 AM
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Paul Lesieur Paul Lesieur is online now
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Default Re: Any feedback on the Corentium Pro?

Today's test results.

60 hours set time.

Sun Nuclear 1027 read 1.8 Pc

My $199 Corentium read 1.56 Pc

Keep in mind same basement but the detectors were about 10' apart
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  #7  
Old 10/27/16, 5:57 PM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Re: Any feedback on the Corentium Pro?

Great information Paul, it seems like the low level Corentium and the Sun Nuclear have the same readings.
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  #8  
Old 10/27/16, 6:43 PM
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Default Re: Any feedback on the Corentium Pro?

Quote:
Originally Posted by jdeoliveira2 View Post
Great information Paul, it seems like the low level Corentium and the Sun Nuclear have the same readings.
I found that to be true. Tom Witt uses Corentiums for his radon. He's in Maryland and they don't require NIST certification on devices.
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  #9  
Old 10/28/16, 1:02 AM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Re: Any feedback on the Corentium Pro?

They got rid of the state level Radon program here in NM. No licensing, no approved devices. Inspectors tend to follow the NRPP.
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  #10  
Old 10/28/16, 2:22 PM
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Thomas Witt Thomas Witt is offline
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Default Re: Any feedback on the Corentium Pro?

Quote:
Originally Posted by plesieur View Post
I found that to be true. Tom Witt uses Corentiums for his radon. He's in Maryland and they don't require NIST certification on devices.
Correct, I've been using them for awhile now, I also tested them against my sun 1027's, found only negligible differences and sold off the 1027s.

Just curious what kind of radon levels do you get in NM?
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  #11  
Old 10/28/16, 3:41 PM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Re: Any feedback on the Corentium Pro?

Albuquerque is situated in the Rio Grande rift, a geologic subduction zone. To the East are mountains, lifted up Granite, along with newer construction and the radon levels get progressively higher close to the mountains. West of the river the houses sit on sand and the levels are usually much lower. The EPA map generally shows high levels for counties in the mountain areas of NM.

Another factor is the extensive use of evaporative coolers which act as whole house fans. It is pointless to test for radon when they are in use.

Tom, what model(s) of the Corentium do you use?
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  #12  
Old 10/28/16, 4:13 PM
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Thomas Witt Thomas Witt is offline
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Default Re: Any feedback on the Corentium Pro?

I use the QRI models.

I doubt the radon detectors are much different from model to model.
Probably just the software that goes with them that generates the reports.

Highest I've gotten in Baltimore metro is 26.

Up near the Pa. border can get over 100.
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  #13  
Old 11/5/16, 12:16 AM
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John Paul de Oliveira John Paul de Oliveira is offline
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Default Re: Any feedback on the Corentium Pro?

Corentium feedback:

Tom (Airthings)
Nov 1, 09:41 CET
Hello John Paul,
first of all thank you very much for writing to us and for your input.
The CRMs that you have mentioned are all AARST/NRPP-approved, so they are suitable for professional work: their performance is good enough that an independent body certified that Home Inspectors in the US can use them.

On top of this, we are actually planning a comparison study run by a reference lab where all these monitors will be side-by-side: that would help a lot, and as soon as we have the result, I will make sure that you receive the feedback from the lab. In the meantime, please find attached a table with the information on what these machines can offer. As you can see, most of them can only offer the AARST-approval, which is ok but not enough for home Inspectors.
Let me know if there is something else you would like to know. And thanks again fro writing to us.
Best regards,
Airthings
Sales & Support, Global
www.airthings.com


Attachment(s)
comparison.pdf
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  #14  
Old 11/5/16, 7:36 AM
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Thomas Witt Thomas Witt is offline
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Default Re: Any feedback on the Corentium Pro?

One other thought about +/- accuracy of short term radon testing.

Short term radon testing is somewhat limited in accuracy simply because it's short term and radon fluctuates over time.

I always inform my clients of this and that if they want they can do their own long term test after they move in.
I send them to RTCA.com to purchase a 3 month test.





Quote:
Originally Posted by jdeoliveira2 View Post
The Corentium Pro sells for $1500, has 4 sensors, no sensitivity rating(probably good) and supposedly is accurate to within 7% 24 hours and 5% after a week.
Sun nuclear 1028 sells for $1000, has 2 sensors, sensitivity rating in hours instead of minutes, and is accurate to within 25%.
Sun nuclear 1027 sells for $900, has 1 sensor, and is accurate to within ??

25% doesn't seem that accurate when a clients health is on the line. Does anybody have any recommendations on a quality CRM? Radstar? I would like to upgrade from canisters, which I think are accurate to within 5% (Airchek), for quicker turn around time?
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  #15  
Old 11/5/16, 11:26 AM
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John A. Reim John A. Reim is offline
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Default Re: Any feedback on the Corentium Pro?

Thomas, you hit the nail on the head. Short term testing is only practical for real estate transactions. And it does come with a short fall, which is accuracy. Long term testing is by far the better choice for testing a home. Longer exposure + more data = better accuracy. However as we all know, the buyer wants a quick answer to determine who writes the check for the mitigation system. Thus short term testing is not going away any time soon.

When a home tests below 4.0 pCi/l I too always recommend that a customer have a long term test performed after they move in. Or at least re-test in 3 years at a different time of year. Short term testing is a snap shot in time, much like a home inspection.

I know of some colleagues that have done the side by side testing with the Correntium, RadStar, Sun, Air Cat, and E-Perms. The differences with the results are hardly negligible. IMO all the manufacturers make models which are more than suitable for home inspector use. Just be sure you are using models which incorporate tamper protection and environmental data.
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