Hanna 9813 PH/EC/TDS .7 or .5?

[OgreSeeker]

what is the conversion factor for Hanna 9813 PH/EC/TDS meter?

 

[Cotyledons]

The 9813 is variable, you set it to which spec you want to use.

 

[OgreSeeker]

I don't see where it can be adjusted. Can you explain a little better?

 

[FreezerBoy]

Set it to EC (mS/cm or millisiemens per centimeter)

"TDS" and "PPM" are nonexistent, bogus lies. NO meter measures "PPM" or "TDS"! They measure EC and tell you the truth or, they measure EC and lie to you! "PPM" is EC x500, or 560, or 640, or 650, or 700, or 720 or 768 or some number too stupid to even remember. If this thing's truly variable, it's the biggest liar out there using any damn number it pleases to fuck your reading.

Plants are illiterate. They don't care that "PPM" is nonsense. Conversation, however becomes difficult when people can't agree on the bullshit factor. In this case, the meter itself can't agree. EC is EC everywhere you go. Stick to mS/cm.

 

[snowkitty]

OgreSeeker, one of my favorite resources online is BGHydro. They have a good article on EC/TDS meters. Scroll down to the bottom and you will see that the conversion factor for your meter is 0.7.

http://www.bghydro.com/BGH/static/articles/0406_tdspH.asp

BGHydro also has calibration instructions online. You can access them off that same link.

Hope this helps

 

[FreezerBoy]

I'm sorry but, that link is bogus babel.

"For example: a nutrient solution that measures 1000ppm, on a TDS meter, will be the same strength as a solution that reads 1430 µS or 1.43 mS on an EC meter."

FALSE! 1000 "PPM" does NOT equal EC 1.43. It equals EC 2. Unless it equals EC 1.8. Or it could equal EC 1.6 or EC 1.5 or EC 1.4 or EC 1.3. Are we confused yet?

According to the specs, the 9813 is variable. "PPM" is useless enough when fixed. If this can actually use any bullshit factor it wants, it's less than useless.



"PPM" changes with the tides. EC is EC everywhere you go.

 

[ShroomDr]

Set it to EC (mS/cm or millisiemens per centimeter)

"TDS" and "PPM" are nonexistent, bogus lies. NO meter measures "PPM" or "TDS"! They measure EC and tell you the truth or, they measure EC and lie to you! "PPM" is EC x500, or 560, or 640, or 650, or 700, or 720 or 768 or some number too stupid to even remember. If this thing's truly variable, it's the biggest liar out there using any damn number it pleases to fuck your reading.

Plants are illiterate. They don't care that "PPM" is nonsense. Conversation, however becomes difficult when people can't agree on the bullshit factor. In this case, the meter itself can't agree. EC is EC everywhere you go. Stick to mS/cm.

He is right.


forget about ppm, and just start using ec.

people/companies that use ppm are assholes. Now we have to look up there conversion rate

 

[Capn]

I believe the reason its variable is to alow it to compensate for nutrient solution tempurature.

 

[Greyskull]

the conversion factor is .7 for that meter
its a great meter that has served me well for a few years now.

for shits and giggles I always check the
mS/cm before i check the ppm... I'll mulitply it by 700 then check the ppm reading. always good as gold.

make sure you keep it calibrated!

 

[ShroomDr]

I believe the reason its variable is to alow it to compensate for nutrient solution tempurature.

this makes no sense whatsoever. EC is not temperature dependent/sensitive.

 

[Capn]

Yes it does. Nutrient solution of different temperature but same PPM will measure differently because temperature effects conductivity.

 

[ShroomDr]

actually you are correct, in that, temp does effect the electrical conductivity. But that has nothing to do with why ppm is variable, which is what i was actually trying to say.

 

[SKUNK420]

Yes EC is the true reading but ppm's to me is a finer way of measures nutrients. If you work or worked in a machine shop where tight tolerances matter then you'll under it's like 1/8", 1/16" or 1/32" or thousandth of an inch" when using micrometers. I just wish the damn nutrient manufacturers would would stick to an EC standard or list their conversion factor when using ppm's. General Hydroponics uses NaCI scale 0.5 and it's listed on their FloraNova bottles and Fox Farm is 0.7 look at their feeding chart and do the math.