My new house with a pool

[SBR_GUY]

Now I have acsess to a HACH DR/2400 spectrophotometer. I am going to borrow it tonight to test my Cl and use the HACH handheld meter to test my PH.

[PoolDoc]

That's fine.

But make sure you do a double buffer calibration on the pH meter. Regardless of their cost, pH meters are USELESS without calibration OR if they have old or plugged electrodes.

And keep in mind that if you use the HACH DPD method . . . it is subject to the EXACT same problems as the Taylor 1004.

If you have a spec, you probably can do accurate dilutions. Test with OTO drops first: a DARK yellow OTO result is probably out of range for the HACH; orange certainly is. If you get a dark yellow or orange result, do a 1:3 dilution with distilled water, and multiply the HACH result x4 .

[SBR_GUY]

That's fine.

But make sure you do a double buffer calibration on the pH meter. Regardless of their cost, pH meters are USELESS without calibration OR if they have old or plugged electrodes.

And keep in mind that if you use the HACH DPD method . . . it is subject to the EXACT same problems as the Taylor 1004.

If you have a spec, you probably can do accurate dilutions. Test with OTO drops first: a DARK yellow OTO result is probably out of range for the HACH; orange certainly is. If you get a dark yellow or orange result, do a 1:3 dilution with distilled water, and multiply the HACH result x4 .

I calibrated it this morning using a 4PH, 7PH & 10PH buffer. It cal'ed to with in .02 of each other. This HACH will test to 10 Cl anything above that will be off scale high.
This is the HACH we have. http://www.equipcoservices.com/renta...otometers.html

I work as an Operator at a Power Plant and we make our own Demineralized water and Potable water plus we have to do our own Boiler water testing. We have lots of cool testing equipment. LOL

[BigDave]

Don't let that gizmo stop you from ordering a K-2006. The FAS-DPD titration test will give you accurate, repeatable (useful) readings. Maybe you could do a comparison and let us know how well it works.

[SBR_GUY]

Don't let that gizmo stop you from ordering a K-2006. The FAS-DPD titration test will give you accurate, repeatable (useful) readings. Maybe you could do a comparison and let us know how well it works.

LOL. I was going to get the K-2006 anyway and then do the comparison test.

[PoolDoc]

Dave, given that somebody probably paid upwards of $2,000 for that thing . . . they might object to referring to it as a "gizmo".

But your point is correct. I fought that battle many times, with pool operators who struggled to accept the idea that they were going to calibrate an $8,000 pool controller with a $25 test kit. Spectrophotometer don't suffer the same sort of inherent 'drift' troubles controls or instruments using pH, ORP, or thin film electrodes -- but they are subject to a variety of other systemic errors. All too often, equipment operators fail to validate them, and then use them to generate useless or even dangerous results.

But, properly calibrated, such systems are capable of producing results almost as good as old-style buret titrations!

[BigDave]

... they might object to referring to it as a "gizmo".

Fine. Sorry. Doohickey then.

... lots of cool testing equipment.

And a Station Chemist as well I'd guess - convienient.

I owe you an apology SBR_GUY, I read your post too quickly and presumed that your poolRX friend had loaned you a strip reader (Hach makes 'em). My bad. We good?

Glad to hear you're ordering the K-2006, I'm sure you'll be happy with it.

[SBR_GUY]

fine. Sorry. Doohickey then.

And a station chemist as well i'd guess - convienient.

I owe you an apology sbr_guy, i read your post too quickly and presumed that your poolrx friend had loaned you a strip reader (hach makes 'em). My bad. We good?

Glad to hear you're ordering the k-2006, i'm sure you'll be happy with it.

lol. I never did like the strips. We do have those here at work also, but I refuse to use them.

OH and its NOT a doohickey its a Chingadera. LMAO

[SBR_GUY]

Don't let that gizmo stop you from ordering a K-2006. The FAS-DPD titration test will give you accurate, repeatable (useful) readings. Maybe you could do a comparison and let us know how well it works.

OK. I did my tests last night and here are the results. YES i added 1 chlorine tab (Trichloro-s-triazinetrione), when i get home im gonna test again and remove the tab and add liquid, we have 500 gallon totes of the stuff here at work.

HACH: .8 TC, .9 FC, .1 CC.
TAYLOR: 1-2 Cl, .5-1 CC, 7.7 PH, 120 TA.
ULTRAMETER II: 7.49 PH.