:lol:
OK, go for it!
OK, go for it!
Reef Chemistry Quiz 2006 is Coming!
- Thread starter Randy Holmes-Farley
- Start date
wife no likey
New member
Thank you . . I sort of felt cheap 
I sort of felt cheap
Sort of what you'd expect, being penniless.
Sort of what you'd expect, being penniless.
wife no likey
New member
lol. .I like to call it "frugal" 
Great job!
Starting your own reef sounds like a good idea.
Starting your own reef sounds like a good idea.
Last edited:
rick rottet
reefkeeper// propagator
48
closed book, no calculator
not accounting for the bug in #34 (50)
not accounting for the trick in #11 (lol) (52)
closed book, no calculator
not accounting for the bug in #34 (50)
not accounting for the trick in #11 (lol) (52)
:thumbsup:
Good job. I'll have to make the tricks less obvious next year.
Good job. I'll have to make the tricks less obvious next year.
great quiz
Thanks.
I guess 11 should have been written better, but as long as you knew the principles, take the points!
although a 70% closed book will be enough to keep my parameters stable.
:thumbsup:
That's a very good score.
At least I got the ones with the calculator right!
:lol:
Thanks.
I guess 11 should have been written better, but as long as you knew the principles, take the points!
although a 70% closed book will be enough to keep my parameters stable.
:thumbsup:
That's a very good score.
At least I got the ones with the calculator right!
:lol:
Hi randy,
Great questions! Lots of them tell me I need to brush up on my chem.
Oh well thats what you get when your a biologist working at a pharm plant as a Chemist.
Anyway,
Question 11. great question I know your right, But 'off the cuff'
D: is correct to if you took into account 20C water and calibration of conductivity meter was done at 25C.
I do conductivity, everyday the variation 2.14%/1C or so... No ATC
(USP...Grrr) and there you go. Plus I think you will agree the algorythms that are programmed into the handheld 'reef' units might not be that accurate. Plus cell constant... (no reef unit has that I am aware of) I am rambleing...
Understandable, at saltwater ppm your change isn't much.
I got a 64% (w/o corr. for 11 if I was kinda right) marine environmental biochemistry grad school here I come hopefully next year!
:rollface:
Great questions! Lots of them tell me I need to brush up on my chem.
Oh well thats what you get when your a biologist working at a pharm plant as a Chemist.
Anyway,
Question 11. great question I know your right, But 'off the cuff'
D: is correct to if you took into account 20C water and calibration of conductivity meter was done at 25C.
I do conductivity, everyday the variation 2.14%/1C or so... No ATC
(USP...Grrr) and there you go. Plus I think you will agree the algorythms that are programmed into the handheld 'reef' units might not be that accurate. Plus cell constant... (no reef unit has that I am aware of) I am rambleing...
Understandable, at saltwater ppm your change isn't much.
I got a 64% (w/o corr. for 11 if I was kinda right) marine environmental biochemistry grad school here I come hopefully next year!
:rollface:
I got a 64%
:thumbsup:
Good job.
What conductivity meter do you use? The same ancient one that Tom dug up to find one that doesn't have ATC?
FWIW, I agree that the corrections may not be perfect, but they are not bad. Mine seems pretty constant if I let the same water sample cool down from tank temp. Mine uses a correction designed for natural waters (at least, that's the option that I elected it to use).
:thumbsup:
Good job.
What conductivity meter do you use? The same ancient one that Tom dug up to find one that doesn't have ATC?
FWIW, I agree that the corrections may not be perfect, but they are not bad. Mine seems pretty constant if I let the same water sample cool down from tank temp. Mine uses a correction designed for natural waters (at least, that's the option that I elected it to use).
<a href=showthread.php?s=&postid=6545016#post6545016 target=_blank>Originally posted</a> by Randy Holmes-Farley
The same ancient one that Tom dug up to find one that doesn't have ATC?
:lol:
But the old YSI had a dial to adjust the cell constant at least.
Actually Natural, most hobby meters don't have different sized cells available for purchase so don't include a selectable cell constant. The old YSI was designed for use in everything from distilled water to the Dead Sea so there were a wide variety of conductivity probes that could be used on it. I think it even had a switch to allow one to use the new "micro siemen" units that were being introduced back then.
<a href=showthread.php?s=&postid=6545016#post6545016 target=_blank>Originally posted</a> by Randy Holmes-Farley
I got a 64%
:thumbsup:
Good job.
What conductivity meter do you use? The same ancient one that Tom dug up to find one that doesn't have ATC?
FWIW, I agree that the corrections may not be perfect, but they are not bad. Mine seems pretty constant if I let the same water sample cool down from tank temp. Mine uses a correction designed for natural waters (at least, that's the option that I elected it to use).
I use a Fisher Accumet AB30 w/ ATC shutoff, I am not allowed to use it in my line of work. The USP doesn't allow ATC in there measurements since USP 23. It is a two cell as a 4 cell doesn't have the accuracy and precision that is required for our needs (.09uS-1.5uS) on average.
It does allow for factor of 10^ changes, TDS, uS,mS,ORP, pH(I think), temp, etc..
Separate probe for temp.
I have never heard of being able to set a cell constant, and actually I am not sure if you would want too. Cell constants tell you abs. val. of variation in reading. More of a check/correction in result than calibration setting.
Aquakeeper, thats funny "new measurement" microsiemens!:lol:
Thanks by the way
It was late and off the cuff.
Good line of questions, even for someone with alittle background in the field.
I have never heard of being able to set a cell constant, and actually I am not sure if you would want too.
Many units do allow cell constant adjustment, such as some of the microprocessor controlled units from ThermoOrion:
"What are the differences in the calibration techniques for Orion Conductivity meters?
Orion Conductivity Meters have various calibration techniques depending on the model including Autocalibration, Direct Calibration or Manual Calibration.
The Autocalibration function found on many meters allows the meter to recognize the value of Orion Conductivity standards automatically. This is a quick and convenient calibration technique to determine the conductivity probe's cell constant.
The Direct Calibration technique requires the user to enter the temperature corrected value of the conductivity standard and the meter will determine the cell constant.
Alternately the Manual Calibration allows the user to adjust the cell constant value until the standard reads the appropriate value for its temperature.
For all calibration techniques, Orion conductivity standards are recommended. It is important to assure that fresh aliquots of standard are used each time. It is not recommended to reuse conductivity standards for calibration as this can lead to erroneous results."
from:
http://www.thermo.com/com/cda/service_support/detail/0,2231,155,00.html
Many units do allow cell constant adjustment, such as some of the microprocessor controlled units from ThermoOrion:
"What are the differences in the calibration techniques for Orion Conductivity meters?
Orion Conductivity Meters have various calibration techniques depending on the model including Autocalibration, Direct Calibration or Manual Calibration.
The Autocalibration function found on many meters allows the meter to recognize the value of Orion Conductivity standards automatically. This is a quick and convenient calibration technique to determine the conductivity probe's cell constant.
The Direct Calibration technique requires the user to enter the temperature corrected value of the conductivity standard and the meter will determine the cell constant.
Alternately the Manual Calibration allows the user to adjust the cell constant value until the standard reads the appropriate value for its temperature.
For all calibration techniques, Orion conductivity standards are recommended. It is important to assure that fresh aliquots of standard are used each time. It is not recommended to reuse conductivity standards for calibration as this can lead to erroneous results."
from:
http://www.thermo.com/com/cda/service_support/detail/0,2231,155,00.html
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