ec or ppm

[MrStickyScissors]

Why is there a 500 and 700 setting?

 

[MrStickyScissors]

Iv asked other people this question and they never have an answer.

 

[hondagrower420]

I dont see the point in this.Just using ec as a reference seems like the best option,if its available. Universal language.

Your right.

Why is there a 500 and 700 setting?

It is just a setting. Pick one and use it.

 

[MrStickyScissors]

Your right.



It is just a setting. Pick one and use it.

there has to be a reason.

 

[hondagrower420]

there has to be a reason.

Yeah, so that you have different measurements that are all the same. It's like how tape measures have cm and inches.

All those settings are the same measurement.

 

[hondagrower420]

Why do tape measure have imperial and metric?

So you can use what you are comfortable with.

 

[Carolina Dream'n]

On the 500 scale each point (.1) is 50 ppm.
On the 700 scale each point (.1) is 70 ppm.

Easiest way to look at it IMO.

 

[Carolina Dream'n]

Why is there a 500 and 700 setting?

Because that's what some people already know how to use, they understand their nutrient concentrations on the scale they have been using. Personally I think the 700 scale is pointless. The 500 is much easier to correspond an EC to because the math is much easier for the average person. (Would you rather multiple 70 times 1.5 or 50; 50 is much easier to do math with; for those who's brains work better with patterns instead of pure math: divide the EC in half and add two zeros for even numbers, loose the decimal (.8-400,1.6-800; 2.4-1200, 3.6-1800) see the pattern? For odd number EC, divided the EC in half and add one zero, loose the decimal (.7-350, 1.3-650, 1.9-950). Atleast that's how my crazy brain sees it. Lol

 

[MrStickyScissors]

Seems to me they should just have one setting. Thank you, that answers my question. One setting is pointless

 

[Carolina Dream'n]

Seems to me they should just have one setting. Thank you, that answers my question. One setting is pointless

I only use EC nowadays. It's the only uniform standard of measuring nutrient concentration without declaring what scale your using. And no one is going to say 500 scale after every time they say ppm. So might as well use EC.

 

[GrowerGoneWild]

Seems to me they should just have one setting. Thank you, that answers my question. One setting is pointless

It could have something to do with what kind of solution you are working with. Not everybody is using the probes for hydroponic application.

Mebby I need a cup of coffee, but I would use the .7 conversion, it would show you have a higher concentration vs the lower conversion at .5.
So with a higher number youre going to use less fertilizer for your solution. Hotrod harley suggested that its better to underdose than overdose, and I would have to agree with this. You could simplify and use Ec, but to each their own, my tank monitor is PPM.

The plant itself is the best indicator for adjusting concentration, I'm just using a meter to verify or record it for my log.

 

[Zoltan32]

Jesus..... If you tell someone my reservoir is at 650ppm and don't say which pen (scale) your using, then you could be talking about different numbers in terms of ec.

So when you are discussing ppm with someone else, it's better to just talk in terms of e.c. To save yourself from explaining what scale your on... And save someone else from doing math...
Personally I keep all my notes in ppm, because that's easier to work with... And that's the type of pen I have.. I just convert when I'm making posts...

 

[I.G.Rowdit]

I have a BlueLab ph pen and there is a setting for EC or ppm. No conversion necessary, just select one or the other. Check your manual.

As others have suggested, EC is the least confusing way to measure.

For more than you ever wanted to know about the subject read the papers (parts one to five) by Dr. Argo located at: http://repotme.com/orchid-fertilizer/Orchid-Fertilizer-Pint.html