hanna po4

[alex84]

hi guys i'm using a hanna po4 fotometro.
i think that the instrument give me too many different result
i did 8test in the tank today using 2 cuvet
the first cuvet i obtein:0,23-0,01-0,03-0,13-0,00-0,02-0,07-0,12
second:0,03-0,02-0,12-0,01-0.05-0,04-0.00-0.01
with merk test i always obtain 0,024.
i clean very well all cuvet every time whith rowater-and a cleaning solution
now i think.
for every test i did i clean cuvet and redo zero
hanna po4 is accurate for you?
reading other post using search i notice that for many people it's accurate
i think no

hi and tnx alex

[dodarocs]

Sono i reaggenti difettosi successo anche a me.

[Aged Salt]

Hi Alex, when I use my Hanna, I'm careful to emptying all the packaged reagent, & I gently shake the reagent powder in the curvette until it is completely dissolved[2-3min]. Bob

[alex84]

Hi Alex, when I use my Hanna, I'm careful to emptying all the packaged reagent, & I gently shake the reagent powder in the curvette until it is completely dissolved[2-3min]. Bob

i do this but if i did 5times test i obtain 5 different result.
tomorrow i retry to do more test
hi alex

[gqjeff]

Alex, mine has been very accurate for me.. I have done back to back tests many times and almost always the same #.. I usually get .02 these days so do not do multiple tests... If you can use a paper towel to hold the covet and clean the outside very well also...

[dodarocs]

Pulire con carta io uso la scottex, prima di fare lo zero e dopo che hai sciolto i reagenti, prima di effettuare il conteggio dei tre minuti.

[G.Alexander]

I also get constant readings +/- 0,01. I use the photometer since 5 years now. If it is for sure, the curvet is cleaned very well (inside and outside) & the chemicals are dissolved completely and the meter still shows those differences, I would send it to Hanna (photometer & chemicals) for a check.

G.Alexander

[darksilenttype]

This seems to a place to get a answer to a question of mine .Were did you guys get you hannah meter at .The price I'm getting is around $250.00

Thanks
John

[gqjeff]

John posted info in your tank thread in regards to the meter..

Jeff

[darksilenttype]

Thanks

[alex84]

my hanna is not good i call hanna many times but for hanna the instruments is good.
today for exp i did 4 test with 4 different cuvet.i obtain:
1-0.00
2-0,04
3-0,08
4-0,02
merk test do 0 all the times
hi alex

[gqjeff]

Alex, not to sound stupid but you are zeroing the unit before the tests correct? Putting tank water into the covet and then placing it in the hole and hitting the zero botton then adding the reagent and shaking for 2-3 min? Then I always push direct read then go for timed read right after that.

Jeff

[Aged Salt]

Hi Alex, the Hanna colorimeter has a test result variation[noise] of .04 that's just a fact. With the results that you have obtained, the median average is ~.04. If one's waters are Hanna undetectable, the read-out will be consistently .00. Bob

[Aged Salt]

Alex, not to sound stupid but you are zeroing the unit before the tests correct? Putting tank water into the covet and then placing it in the hole and hitting the zero botton then adding the reagent and shaking for 2-3 min? Then I always push direct read then go for timed read right after that.

Jeff

Excellent reminder, Jeff, as I've didn't use tank water but RODI water to zero initially Bob

[alex84]

Alex, not to sound stupid but you are zeroing the unit before the tests correct? Putting tank water into the covet and then placing it in the hole and hitting the zero botton then adding the reagent and shaking for 2-3 min? Then I always push direct read then go for timed read right after that.

Jeff

yes i zeoing the unit befor every test with different cuvet
hi alex