Ask The Brewmasters

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

------------------------------
Jordan Hunt
Head Brewer
Crossbuck Brewing
Walla Walla, WA
(503) 516-9569
------------------------------

Hi Jordon,<o:p></o:p>

<o:p> </o:p>

1 volume of CO2 is equal to 1.97 g/l.  To convert CO2 in volumes to g/kg, multiply by (1.98 / Beer specific gravity).  Assume your beer specific gravity is 1.008 and you have 2.65 volumes of CO2; 2.65 x 1.97 ¸ 1.008 = 5.2 g/kg = 5,200 ppm (mg/kg) = 5,200,000 ppb (microgram/kg).<o:p></o:p>

<o:p> </o:p>

Is that what you are looking for?<o:p></o:p>

Cheers,

Ashton

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

I'm specifically looking for in CO2 so if gas supplier reports that my bulk CO2 is 30 ppmv and I wanted to test it with an orbisphere 3100 which reads it in ppb (wt/wt) what should I expect my reading to be. My chemistry days are failing me because the number I got is way too high.

------------------------------
Jordan Hunt
Head Brewer
Mt View Brewing
Redmond OR
(503) 516-9569

Original Message:
Sent: 07-26-2023 12:51
From: Ashton Lewis
Subject: CO2 Conversion from Vol/Vol in ppm to Wt/Wt in ppb

Hi Jordon,<o:p></o:p>

<o:p> </o:p>

1 volume of CO2 is equal to 1.97 g/l.  To convert CO2 in volumes to g/kg, multiply by (1.98 / Beer specific gravity).  Assume your beer specific gravity is 1.008 and you have 2.65 volumes of CO2; 2.65 x 1.97 ¸ 1.008 = 5.2 g/kg = 5,200 ppm (mg/kg) = 5,200,000 ppb (microgram/kg).<o:p></o:p>

<o:p> </o:p>

Is that what you are looking for?<o:p></o:p>

Cheers,

Ashton

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

Regarding the Orbisphere 3100: I normally see measurements of gas/CO2 reported as %O2.  Are the ppb units valid for gas-phase measurements, or only for O2 dissolved in liquid?  I'm really not sure, myself.  But I expect other contributors to this thread could answer and explain if this point is relevant to your situation.

I'm specifically looking for in CO2 so if gas supplier reports that my bulk CO2 is 30 ppmv and I wanted to test it with an orbisphere 3100 which reads it in ppb (wt/wt) what should I expect my reading to be. My chemistry days are failing me because the number I got is way too high.

------------------------------
Jordan Hunt
Head Brewer
Mt View Brewing
Redmond OR
(503) 516-9569

Original Message:
Sent: 07-26-2023 12:51
From: Ashton Lewis
Subject: CO2 Conversion from Vol/Vol in ppm to Wt/Wt in ppb

Hi Jordon,<o:p></o:p>

<o:p> </o:p>

1 volume of CO2 is equal to 1.97 g/l.  To convert CO2 in volumes to g/kg, multiply by (1.98 / Beer specific gravity).  Assume your beer specific gravity is 1.008 and you have 2.65 volumes of CO2; 2.65 x 1.97 ¸ 1.008 = 5.2 g/kg = 5,200 ppm (mg/kg) = 5,200,000 ppb (microgram/kg).<o:p></o:p>

<o:p> </o:p>

Is that what you are looking for?<o:p></o:p>

Cheers,

Ashton

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements of O2 in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

For example, if the gas is delivered at 30 ppmv of O2 in my CO2 what reading should I expect using a DO meter such as an orbisphere or CboxQC when running the gas through the analyzer from the bulk gas system?

------------------------------
Jordan Hunt
Head Brewer
Crossbuck Brewing
Walla Walla, WA
(503) 516-9569
------------------------------

Does anyone know of a conversion to get from ppm values of co2 in vol/vol converted into ppb wt/wt?

Long story short our bulk CO2 got contaminated with oxygen and when trying to talk to our CO2 reps the translation of how they measure dissolved oxygen is different than what I have used in my brewing career, and it is confusing to them how we could get measurements of O2 in ppb when the gas gets delivered and tested in the ppm range even though we are measuring under different units. Our bulk tank tested at 279 ppm (vol/vol) of dissolved O2 in the liquid CO2 when for beverage grade gas it needs to be under 30 ppm (vol/vol).

I have found some really good articles on here about how dissolved CO2 levels in CO2 affect DO levels in carbonated beer. We aim to carbonate our beers at 2.65 volumes and at 279 ppm (vol/vol) of O2 that would put our carbonated beer at around 1050 ppb (wt/wt) of O2.

For example, if the gas is delivered at 30 ppmv of O2 in my CO2 what reading should I expect using a DO meter such as an orbisphere or CboxQC when running the gas through the analyzer from the bulk gas system?

------------------------------
Jordan Hunt
Head Brewer
Crossbuck Brewing
Walla Walla, WA
(503) 516-9569
------------------------------