hannah phos meter and readings
- Thread starter poknsnok
- Start date
That seems odd, my Hanna Phosphate Meter only goes out two places to the right, is that 100ths?? when I use it. I get readings like 0.03, which is what I got today. Are you sure it was not reading 0.144, still though that goes out 1000ths, to far compared to mine. Hmmmmm, odd
poknsnok
New member
if you read the manual it is calibrated to read at 68f (20c).. directions say to divide by 2 at 86f (30c).. IE a reading of.03 at 68f would be .015 at 86f... at 80 it would be .0165... mine is .02 at 80 which gives me .0144 adjusted to temperature.. below is taken from the manual and explained by a local reef store owner
All the reaction times reported in this manual are referred to 20C(68F). As a general rule of thumb, they should be doubled at 10C(50F) and halved at 30C(86F).â€Â
Simple percentage of increase or decrease.
18 degrees F = +/- 50%
My temp is 79F. (11F= ~31%)
The reading is 0.08. (31% = 0.0248)
taken from tha manual and from the explanation of a very knowledgeable LFS here in Tampa
All the reaction times reported in this manual are referred to 20C(68F). As a general rule of thumb, they should be doubled at 10C(50F) and halved at 30C(86F).â€Â
Simple percentage of increase or decrease.
18 degrees F = +/- 50%
My temp is 79F. (11F= ~31%)
The reading is 0.08. (31% = 0.0248)
taken from tha manual and from the explanation of a very knowledgeable LFS here in Tampa
poknsnok
New member
the reaction time is 3 minutes as timed on the meter. I understand what you are saying but the meter has a non adjustable timer set at 3 minutes and counts down from there. I dont see where the countown can be stopped at 1.5 minutes and a reading taken. so i believe the interpretation is correct because of that..I will read the manual later and verify.
GTR
Active member
The only reference of time in the manual that I recall is the timed read. That may be the reason they have the direct reading option and you supply your own alarm clock. :lol:
I talked with Hanna today and though I did talk to a rep he's going to pass on my question to get some clearification on procedure when the test sample is 78°F.
I've had periods of time were I get <.02 results which by this formula would mean actual level would be .0062. Looking at the tank, I think not.
SteveU
I talked with Hanna today and though I did talk to a rep he's going to pass on my question to get some clearification on procedure when the test sample is 78°F.
I've had periods of time were I get <.02 results which by this formula would mean actual level would be .0062. Looking at the tank, I think not.
SteveU
chadfarmer
Premium Member
i am down to .02
so that means .01
so that means .01
jmcmahon66
New member
poknsnok- I am a little confused as to your actual reading on the meter. Is your uncorrected reading 0.08 or 0.02? Others have reported the instrument reading in their replies. My Hanna has an instrument reading of 0.03. I was unaware of a correction factor, and have always used the instrument reading for my PO4 level determination. If you wish to compare your readings to others (as you mentioned in the start of this thread), you have your answers. As you know, the meter is somewhat sensitve to other factors like fingerprints, amount of reagent used, micorbubbles, and undissolved reagent so consistancy is the key to taking a good reading. It took me several times to get consistant results.
poknsnok
New member
the reading on the meter was .02... adjusted to 81 degrees s/be .0144... I cleaned as best I can the vial. tried to keep micr's to a minimum. I will test a few times this weekend to see what kind of spread I get... If the manual is followed you need to adjust for temp. whether you adhust the time of the test or the reading I am not sure. Im going to call Hannah and see. The manual states that the perscribed times were at 68f and to be corrected at other temps.
Last edited:
falcon41176
In Memoriam
where did you guys buy your meters at
