Hanna calibration kits

[davej]

Picked up a set to check my low range phosphate checker. Read exactly 1.00 like it should have. Good to know it's working right.

[Myka]

Originally Posted by davej

Picked up a set to check my low range phosphate checker. Read exactly 1.00 like it should have. Good to know it's working right.

Awesome, thanks!

[Myka]

I emailed tech@hannainst.com and here is the response I got:

Originally Posted by Pete

You can use the HI713 on both fresh and salt water samples.

The HI713 meters accuracy is +/-.04 + +/-4% of reading.

For example:

0ppm the accuracy is +/-.04

1ppm the accuracy is +/-.08

2ppm the accuracy is +/-.12


If you are looking for a more precise measurement you should consider using the HI736 Phosphorus Ultra Low Range meter.

This meter +/-5ppb + +/-5% of reading


This meters range is from 0 to 200 ppb (.20ppm) of Phosphorus. You would just have to do some conversion to get the reading into ppm of PO4.

To convert the phosphorus (P) reading on this meter in to phosphate (PO4) you would have to multiply by .003


For example:

Meter reads:
10ppb of P = .03ppm PO4
100ppb = .30ppm PO4
200ppb = .60ppm PO4


Regards,
Pete

[Reef Pilot]

Yes, the phosphorus checker is the most accurate for ultra low range. It was not available from local vendors when I bought my phosphate checker.

However, the phosphate one is more than adequate for my needs esp when compared to the color chart test kits. Despite the 0.04 accuracy spec, I usually get zero readings until my GFO starts getting stale and needs changing. Then I start getting readings above zero, and when it gets to about 0.04, I stir up my GFO in my reactor. Usually after that it drops back down to zero. If it doesn't, I change my GFO, and then it does drop back down to zero. So with those kinds of readings that follow my actions, am more than happy with my phosphate checker accuracy.

[George]

Originally Posted by Reef Pilot

Yes, the phosphorus checker is the most accurate for ultra low range. It was not available from local vendors when I bought my phosphate checker.

However, the phosphate one is more than adequate for my needs esp when compared to the color chart test kits. Despite the 0.04 accuracy spec, I usually get zero readings until my GFO starts getting stale and needs changing. Then I start getting readings above zero, and when it gets to about 0.04, I stir up my GFO in my reactor. Usually after that it drops back down to zero. If it doesn't, I change my GFO, and then it does drop back down to zero. So with those kinds of readings that follow my actions, am more than happy with my phosphate checker accuracy.

Your experience is called consistent. It has nothing to do with accuracy. In order to know if your device is accurate, you have to calibrate it against a known standard. For argument's sake, your actual PO4 could be 0.2 before and 0.1 after (even though your device reports 0.04 and 0).

[Reef Pilot]

Originally Posted by George

Your experience is called consistent. It has nothing to do with accuracy. In order to know if your device is accurate, you have to calibrate it against a known standard. For argument's sake, your actual PO4 could be 0.2 before and 0.1 after (even though your device reports 0.04 and 0).

Yeah, I can't argue that... However, I have compared it to the color chart test kits (that I still have) and it is still more accurate than them, and that hasn't changed. And I guess based on the behavior of my tank and readings, have no reason to believe that accuracy has fallen off. So for my purposes, I consider it more than accurate enough.

The Hanna checker is just one of many tools I use to monitor and maintain my tank. The requirement for accuracy (maybe granularity is a better term) varies by water parameter. For example, I just use API for my dKH, N03 and Ca. Those test kits are accurate enough for me to maintain the desired ranges for those parameters. And I do have/had the higher granularity test kits for them as well to compare.

But with P04, I found a difference in color and growth of SPS when it reached 0.10. My color chart test kits were still reading zero at that level. So for me the Hanna checker was necessary to get the level of accuracy (or granularity) that I needed for my SPS.

Having said all that, it would be interesting (but not necessary IMO) to go out and get a calibration kit. If I start getting readings that don't make sense, for sure I will do that.

[Bblinks]

Originally Posted by davej

Picked up a set to check my low range phosphate checker. Read exactly 1.00 like it should have. Good to know it's working right.

Not sure if you are using it correctly, I might have to borrow the calibration fluids and check it out in my Hanna.....

[davej]

Originally Posted by Bblinks

Not sure if you are using it correctly, I might have to borrow the calibration fluids and check it out in my Hanna.....

Rich you would be more than welcome, but..
It's a one time use kit.
Comes with two vials one at 0.0 that you put in first to calibrate the meter C1
Then you take second vial that comes preloaded with phosphate level at 1.00, add the little powder pack and mix. After the three minutes you get second reading C2 which in my case was bang on 1.00
If you want I can bring my calibrated meter over and we can test your water with both. If reading is the same then we know yours is accurate as well.
Let me know

[Bblinks]

Originally Posted by davej

Rich you would be more than welcome, but..
It's a one time use kit.
Comes with two vials one at 0.0 that you put in first to calibrate the meter C1
Then you take second vial that comes preloaded with phosphate level at 1.00, add the little powder pack and mix. After the three minutes you get second reading C2 which in my case was bang on 1.00
If you want I can bring my calibrated meter over and we can test your water with both. If reading is the same then we know yours is accurate as well.
Let me know

Oh I get it. I thought it was premixed and all you had to do is put it in but didn't realize you had to add powder to it still. Interesting.

If you ever have time, I would love for you to come by and do a test. Thanks very much!

[Treebeard]

Originally Posted by davej

Rich you would be more than welcome, but..
It's a one time use kit.
Comes with two vials one at 0.0 that you put in first to calibrate the meter C1
Then you take second vial that comes preloaded with phosphate level at 1.00, add the little powder pack and mix. After the three minutes you get second reading C2 which in my case was bang on 1.00
If you want I can bring my calibrated meter over and we can test your water with both. If reading is the same then we know yours is accurate as well.
Let me know

What if the second reading is not 1.00? Is there a way to adjust it?