Hanna ULR Phos spastic measurements - Page 2

mako61 · 09/25/2017, 03:25 PM

I think what he means by using 2 vials -

take 2 vials that measure the same with just water -
use one vial to zero the meter -
use second vial with test solution -
zero meter with first vial - read the test solution in second vial

repeat this a few time to get an average reading of test solution with out having to redo test solution.

I did that at first myself, but i was unsure if using 2 vials added more error than the average helped. I did notice the number changed a good bit with this method try to try which was a bit disappointing.

outssider · 09/25/2017, 04:41 PM

+1...

fill both vials with tank water. add the reagent to one. turn the vial up side down/right side up gently to mix the powder. after it's mixed well wait a couple minutes for any bubbles to dissipate. put the unreacted sample in the checker for the first read then put the reacted sample in for the second read. you can do this many times to get many readings off the same samples. This will only work well if the two vials are matched in clarity and diameter.

catman78 · 09/26/2017, 04:36 AM

See bold below.
Use one vial and a separate 3 minute time(Phone, kitchen timer, etc.)

See post 128

http://166.78.194.238/forums/showthr...2363251&page=6

"I reckon I have got a process through practice which works for me. I can get exactly the same reading now 2-3 times in succession...used a few packs of reagent getting there....but am confident now with the 736 Checker.

wash cuvette well in sample water and fill to 10mls, put cap on
polish outside with cloth, tap firmly on table a few times to free bubbles
insert and align "10" marking to front..anywhere will do ...just remember
close unit..press nothing yet

fold small dry paper down centre
empty a reagent packet fully onto paper, spread along the fold a little

press button to power on
press button again to set unreacted baseline (then shows C2 for 3 mins then turns off and you waste the reagent...but there is plenty of time to do this)
remove cuvette, remove cap
wipe top rim of cuvette with cloth or tissue to dry it..(important)
pour reagent in...dry top means paper doesn't wet and stop pour.
close and shake well 1.5-2.0 mins (some people say gently..?)
polish glass with cloth
tap on table 10 times holding by lid to free micro bubbles
insert in checker aligned same as before
hold button in to start 3 min reaction time
leave on table...do not pick up..allowing to settle clear
see Phosphorus reading ppb after 3 mins
multiple by .03066 if you want Phosphate equivalent

I had a bad box of reagent but am now good... you just have to validate your reagent in some way..my bad one just read 0,1,0 etc...so I was confident it was bad....I knew I had a phosphate problem as my Red Sea Pro PO4 test was saying about 0.10...but hard to read. I now get 28 ppb Phosphorus from the 736 and can repeat it....multiplies out to .086 phosphate equivalent which is where I would expect after a using bit of Phosphate Killer.

Now works for me."

09/25/2017, 03:25 PM	#26
mako61 Registered Member Join Date: Feb 2017 Location: Dallas Posts: 359	I think what he means by using 2 vials - take 2 vials that measure the same with just water - use one vial to zero the meter - use second vial with test solution - zero meter with first vial - read the test solution in second vial repeat this a few time to get an average reading of test solution with out having to redo test solution. I did that at first myself, but i was unsure if using 2 vials added more error than the average helped. I did notice the number changed a good bit with this method try to try which was a bit disappointing. __________________ Thanks, Mako Current Tank Info: Returning Reefer - Red Sea 525XL, Mitras LX7s, Apex, check homepage for vids of tank

09/25/2017, 04:41 PM	#27
outssider Registered Member Join Date: Nov 2009 Location: Reseda, Ca. Posts: 1,717	+1... fill both vials with tank water. add the reagent to one. turn the vial up side down/right side up gently to mix the powder. after it's mixed well wait a couple minutes for any bubbles to dissipate. put the unreacted sample in the checker for the first read then put the reacted sample in for the second read. you can do this many times to get many readings off the same samples. This will only work well if the two vials are matched in clarity and diameter.

09/26/2017, 04:36 AM	#28
catman78 Registered Member Join Date: Aug 2008 Location: LI N.Y. Posts: 765	See bold below. Use one vial and a separate 3 minute time(Phone, kitchen timer, etc.) See post 128 http://166.78.194.238/forums/showthr...2363251&page=6 "I reckon I have got a process through practice which works for me. I can get exactly the same reading now 2-3 times in succession...used a few packs of reagent getting there....but am confident now with the 736 Checker. wash cuvette well in sample water and fill to 10mls, put cap on polish outside with cloth, tap firmly on table a few times to free bubbles insert and align "10" marking to front..anywhere will do ...just remember close unit..press nothing yet fold small dry paper down centre empty a reagent packet fully onto paper, spread along the fold a little press button to power on press button again to set unreacted baseline (then shows C2 for 3 mins then turns off and you waste the reagent...but there is plenty of time to do this) remove cuvette, remove cap wipe top rim of cuvette with cloth or tissue to dry it..(important) pour reagent in...dry top means paper doesn't wet and stop pour. close and shake well 1.5-2.0 mins (some people say gently..?) polish glass with cloth tap on table 10 times holding by lid to free micro bubbles insert in checker aligned same as before hold button in to start 3 min reaction time leave on table...do not pick up..allowing to settle clear see Phosphorus reading ppb after 3 mins multiple by .03066 if you want Phosphate equivalent I had a bad box of reagent but am now good... you just have to validate your reagent in some way..my bad one just read 0,1,0 etc...so I was confident it was bad....I knew I had a phosphate problem as my Red Sea Pro PO4 test was saying about 0.10...but hard to read. I now get 28 ppb Phosphorus from the 736 and can repeat it....multiplies out to .086 phosphate equivalent which is where I would expect after a using bit of Phosphate Killer. Now works for me."