Hannah HI713 questions

degibson84 · 02/21/2014, 04:19 PM

Just it the Hannah phosphate checker and am reading the directions and just a bit confused.

10ml of unreacted sample. Is this just tank water with no reagent?

Also I heard about the instrument timing out to fast between samples. Should I mix the reagent in before starting the test with the unreacted sample so I don't timeout?

degibson84 · 02/21/2014, 06:00 PM

So nobody has ever used a Hannah checker all the sudden

shifty51008 · 02/21/2014, 06:11 PM

yes the sample is just tank water, no reagent. you have to 0 out the checker 1st before adding in the reagent, if it is the new checker then it has a longer timeout so you should be good, if it does have the short shutoff you may have to try it 2-3 times to get it but after you figure it out it's easy enough to do without having it time out on you. a good trick is to get the reagent already open and ready to pour in as soon as it is zero'd out. also try to keep the test tube in the same direction each time.

degibson84 · 02/21/2014, 06:26 PM

So you don't use the second tube for water with reagent? The directions just say to add the unreacted sample in and wait til it says c2 then to added the reacted sample. It states that the reagent takes two minutes to dissolve and also states it will timeout at two minutes. That is the reason I thought one tube for straight tank water and the other for water with reagent.

Maybe I am just over thinking it. But now I feel even more confused

nystang · 02/21/2014, 06:41 PM

I would not use 2 tubes for the measurement. There may be a slight difference in the glass and the results are not accurate. This is how I do it. I open the bag and prepare it for removing the powder to the tube. After you insert the tube with the tank water, press the button to turn it on and then press it again. After a few seconds you will see C2 on the display. Add the powder to the tube and turn on your timer for 2 minutes. I always mix it in steady movements for 1 min and 40 seconds. It never times out.

degibson84 · 02/21/2014, 07:27 PM

So what is the other tube for??? Just for fun

alan.reef · 02/21/2014, 07:30 PM

only use 1 tube for accuracy reading. pratice few times you will be good

shifty51008 · 02/21/2014, 08:08 PM

the 2nd tube is there for a spare

fifthtoe · 02/21/2014, 10:07 PM

Also you need to give it time for all the micro bubbles to rise. You won't really be able to see them but if you hold it under your tank lighting, you'll see them. Give it a couple taps on the bottom of vial to dislodge bubbles from sticking to the side. Too many bubbles can give you an inaccurate reading. Also make sure the outside of vial is clean... No water, fingerprints, lint, etc

degibson84 · 02/22/2014, 07:00 PM

So I setup a stopwatch and got 3:13 before it times out. I also ran two tests and got 0.09 and 0.07. The first one I don't think was accurate as I rushes it and don't think all the reagent dissolved.

reefdude3749 · 02/22/2014, 07:03 PM

If you read the directions closely...those two test results are equivalent given the standard error of the instrument...you must have good technique...nice work.

shifty51008 · 02/22/2014, 07:05 PM

i agree, your within the +/- of .03 range of these checkers so your doing it correctly

outssider · 02/22/2014, 07:12 PM

If you press and hold the button down after c2 you can activate the 3 minute count down timer.

so if you're getting 3:13 seconds before it times out push and hold the button down. This will get you another 3 minutes. you can shack gently for 2-3 minutes then push and hold the timer, put the vial in, and the checker will count down 3 minutes before it reads. This will give you time for the micro bubbles to float out.... you can also give it a few gentle taps on the table to help release the bubbles.....

go to you-tube there are manufacturer videos there....

degibson84 · 02/22/2014, 07:12 PM

Really thought the numbers would be lower given I am running GFO through a BRS reactor and also running an algae scrubber.

SantaMonica · 02/22/2014, 10:04 PM

Is all relative to your nutrient input, and/or phosphate in the rocks. Or even a recent moving of rocks, which will kill the periphyton on them.

Crusinjimbo · 02/23/2014, 05:45 AM

I use both vials to run the test. I ran numerous "tests" with both vials using RODI in each and never recorded any variation in results, always zero. Using two vials makes it possible to run the test twice (without another settling 3 minute countdown on the second test) and interpret the two results. I have also noted that my Hanna sometimes take 30 seconds 'tween C1 and C2 and sometimes only 4-6 seconds. The results don't seem to change but the timing changes.

degibson84 · 02/23/2014, 06:18 AM

My nutrient input is fairly minimal. I feed half a cube a day. Sometimes a little less. I would imagine it is leaching out of the rocks even though this system was set up 9 months ago.

degibson84 · 02/25/2014, 04:56 PM

Is it possible for my phosphate levels to drop to 0.02. On Sunday I changed out 15 gallons of water and replaced te GFO with 1 cup of fresh. Is that really possible or was my test off??? My system is approximately 250 gallons so a 15 gallon change isn't really significant

shifty51008 · 02/25/2014, 06:38 PM

it is possiable, GFO pull out phosphate fast and will also get used up fast, sometimes within a day it needs to be changed. your best bet is to test the output levels of the GFO reactor and that will tell you when you need to change it.

also going by your numbers and the accuracy of the checker it may not have dropped much at all as your .07 could actually be .1-.04 and your .02 reading could be .05-.00. but if your getting a reading of .02 your good to go.

degibson84 · 06/01/2014, 06:50 AM

Bring this back to life.

Just ran 3 consecutive tests all 3 came out 0.00.

outssider · 06/02/2014, 06:10 PM

test your tap water, If you're still getting zero, you got a problem....probably the reagents.

Crusinjimbo · 06/03/2014, 05:19 AM

I use both vials with the 3 minute countdown on the first test and two more quick tests without the countdown. Three results, two are usually the same results with one off by +/- 0.01. I use the average of the three results. I am less concerned about the actual number than the trend. I test every 3-4 days. I can't figure if the published Hanna .04 error is a consistent or a variable event.

degibson84 · 06/03/2014, 03:17 PM

Quote:

Originally Posted by outssider

test your tap water, If you're still getting zero, you got a problem....probably the reagents.

Reagents are brand new just ordered them a few months back.

outssider · 06/03/2014, 06:10 PM

Quote:

Originally Posted by degibson84

Reagents are brand new just ordered them a few months back.

could be a bad batch. I have never had a bad batch but some people on RC have

degibson84 · 06/12/2014, 01:56 PM

Got a new box of reagents today and still getting a 0.00 reading. Could my checker have gone bad?

02/21/2014, 04:19 PM	#1
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	Hannah HI713 questions Just it the Hannah phosphate checker and am reading the directions and just a bit confused. 10ml of unreacted sample. Is this just tank water with no reagent? Also I heard about the instrument timing out to fast between samples. Should I mix the reagent in before starting the test with the unreacted sample so I don't timeout?

02/21/2014, 06:11 PM	#3
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	yes the sample is just tank water, no reagent. you have to 0 out the checker 1st before adding in the reagent, if it is the new checker then it has a longer timeout so you should be good, if it does have the short shutoff you may have to try it 2-3 times to get it but after you figure it out it's easy enough to do without having it time out on you. a good trick is to get the reagent already open and ready to pour in as soon as it is zero'd out. also try to keep the test tube in the same direction each time. __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

02/21/2014, 08:08 PM	#8
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	the 2nd tube is there for a spare __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

02/22/2014, 07:05 PM	#12
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	i agree, your within the +/- of .03 range of these checkers so your doing it correctly __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

02/23/2014, 05:45 AM	#16
Crusinjimbo Registered Member Join Date: Dec 2008 Location: Wesley Chapel FL Posts: 751	I use both vials to run the test. I ran numerous "tests" with both vials using RODI in each and never recorded any variation in results, always zero. Using two vials makes it possible to run the test twice (without another settling 3 minute countdown on the second test) and interpret the two results. I have also noted that my Hanna sometimes take 30 seconds 'tween C1 and C2 and sometimes only 4-6 seconds. The results don't seem to change but the timing changes. __________________ Jimbo 13.5G EVO

02/21/2014, 06:00 PM	#2
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	So nobody has ever used a Hannah checker all the sudden

02/21/2014, 06:26 PM	#4
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	So you don't use the second tube for water with reagent? The directions just say to add the unreacted sample in and wait til it says c2 then to added the reacted sample. It states that the reagent takes two minutes to dissolve and also states it will timeout at two minutes. That is the reason I thought one tube for straight tank water and the other for water with reagent. Maybe I am just over thinking it. But now I feel even more confused

02/21/2014, 06:41 PM	#5
nystang Registered Member Join Date: May 2012 Location: Brooklyn, NY Posts: 249	I would not use 2 tubes for the measurement. There may be a slight difference in the glass and the results are not accurate. This is how I do it. I open the bag and prepare it for removing the powder to the tube. After you insert the tube with the tank water, press the button to turn it on and then press it again. After a few seconds you will see C2 on the display. Add the powder to the tube and turn on your timer for 2 minutes. I always mix it in steady movements for 1 min and 40 seconds. It never times out.

02/21/2014, 07:27 PM	#6
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	So what is the other tube for??? Just for fun

02/21/2014, 07:30 PM	#7
alan.reef Registered Member Join Date: Sep 2008 Location: new york Posts: 114	only use 1 tube for accuracy reading. pratice few times you will be good

02/21/2014, 10:07 PM	#9
fifthtoe Registered Member Join Date: Feb 2008 Location: Raleigh, NC Posts: 274	Also you need to give it time for all the micro bubbles to rise. You won't really be able to see them but if you hold it under your tank lighting, you'll see them. Give it a couple taps on the bottom of vial to dislodge bubbles from sticking to the side. Too many bubbles can give you an inaccurate reading. Also make sure the outside of vial is clean... No water, fingerprints, lint, etc

02/22/2014, 07:00 PM	#10
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	So I setup a stopwatch and got 3:13 before it times out. I also ran two tests and got 0.09 and 0.07. The first one I don't think was accurate as I rushes it and don't think all the reagent dissolved.

02/22/2014, 07:03 PM	#11
reefdude3749 Registered Member Join Date: Sep 2012 Location: Michigan Posts: 77	If you read the directions closely...those two test results are equivalent given the standard error of the instrument...you must have good technique...nice work.

02/22/2014, 07:12 PM	#13
outssider Registered Member Join Date: Nov 2009 Location: Reseda, Ca. Posts: 1,717	If you press and hold the button down after c2 you can activate the 3 minute count down timer. so if you're getting 3:13 seconds before it times out push and hold the button down. This will get you another 3 minutes. you can shack gently for 2-3 minutes then push and hold the timer, put the vial in, and the checker will count down 3 minutes before it reads. This will give you time for the micro bubbles to float out.... you can also give it a few gentle taps on the table to help release the bubbles..... go to you-tube there are manufacturer videos there....

02/22/2014, 10:04 PM	#15
SantaMonica Registered Member Join Date: Feb 2007 Location: Santa Monica, California, USA Posts: 2,511	Is all relative to your nutrient input, and/or phosphate in the rocks. Or even a recent moving of rocks, which will kill the periphyton on them.

02/23/2014, 06:18 AM	#17
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	My nutrient input is fairly minimal. I feed half a cube a day. Sometimes a little less. I would imagine it is leaching out of the rocks even though this system was set up 9 months ago.

02/25/2014, 04:56 PM	#18
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	Is it possible for my phosphate levels to drop to 0.02. On Sunday I changed out 15 gallons of water and replaced te GFO with 1 cup of fresh. Is that really possible or was my test off??? My system is approximately 250 gallons so a 15 gallon change isn't really significant

02/25/2014, 06:38 PM	#19
shifty51008 12-5 Chiefs record Join Date: Mar 2010 Location: NW Iowa Posts: 10,134	it is possiable, GFO pull out phosphate fast and will also get used up fast, sometimes within a day it needs to be changed. your best bet is to test the output levels of the GFO reactor and that will tell you when you need to change it. also going by your numbers and the accuracy of the checker it may not have dropped much at all as your .07 could actually be .1-.04 and your .02 reading could be .05-.00. but if your getting a reading of .02 your good to go. __________________ 75 gal. mixed DT, 100 gal. sump, 50 gal. fuge, Clownfish breeder

06/01/2014, 06:50 AM	#20
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	Bring this back to life. Just ran 3 consecutive tests all 3 came out 0.00.

06/02/2014, 06:10 PM	#21
outssider Registered Member Join Date: Nov 2009 Location: Reseda, Ca. Posts: 1,717	test your tap water, If you're still getting zero, you got a problem....probably the reagents.

06/03/2014, 05:19 AM	#22
Crusinjimbo Registered Member Join Date: Dec 2008 Location: Wesley Chapel FL Posts: 751	I use both vials with the 3 minute countdown on the first test and two more quick tests without the countdown. Three results, two are usually the same results with one off by +/- 0.01. I use the average of the three results. I am less concerned about the actual number than the trend. I test every 3-4 days. I can't figure if the published Hanna .04 error is a consistent or a variable event. __________________ Jimbo 13.5G EVO

06/12/2014, 01:56 PM	#25
degibson84 Registered Member Join Date: Feb 2013 Location: Youngstown, OH Posts: 2,393	Got a new box of reagents today and still getting a 0.00 reading. Could my checker have gone bad?