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Need Help With Which Ec/ph Meter


johnbs8
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im looking at 2 PH/EC/PPM meters both made by hanna. on is the hanna hi 98129 and the other is the hanna hi 98130. one is high range and one is low range. not sure which one to get. im gonna use canna nutes for cocoa. off the canna site thier feeding chart sais that id need a max ec vaulue of 1.9 or 1000PPM. here are the stats for the meters:

 

Hanna Hi 98129

pH 0.00 to 14.00 pH

EC 0 to 3999 µS/cm

TDS 0 to 2000 ppm

Temp 0.0 to 60.0°C / 32 to 140.0°F

 

Hanna Hi 98130

pH 0.00 to 14.00 pH

EC 0.00 to 20.00 mS/cm

TDS 0.00 to 10.00 ppt

Temp 0.0 to 60.0°C / 32 to 140.0°

 

Thanks in advance John

Edited by johnbs8
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I've been using the HI 9813-6 for years and have had nothing but good things to say about it. I would go with the HI 9813-5 or HI 9813-6 as they both offer temperature readings which the HI 9813-0 doesn't have and is very useful, especially when re-calibrating. The -6 model has an automatic calibration check to see if you need to re-calibrate which is handy but not necessary.

HI 9813-0, HI 9813-5, HI 9813-6, specs are all:

 

PH-0.0-14.0

ppm-0-1999

mS/cm-0.00-4.00

degrees Celsius-0.0-60.0 (-5 & -6 models)

 

Hope this helps a little.

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I've been using the HI 9813-6 for years and have had nothing but good things to say about it. I would go with the HI 9813-5 or HI 9813-6 as they both offer temperature readings which the HI 9813-0 doesn't have and is very useful, especially when re-calibrating. The -6 model has an automatic calibration check to see if you need to re-calibrate which is handy but not necessary.

HI 9813-0, HI 9813-5, HI 9813-6, specs are all:

 

PH-0.0-14.0

ppm-0-1999

mS/cm-0.00-4.00

degrees Celsius-0.0-60.0 (-5 & -6 models)

 

Hope this helps a little.

 

Thanks for the reply. im just curious why they have a high range and low range. i dont want to purchase the low rang and then realize i need the other. both the models i listed do temps or am i missing something? also the 2 models im looking at are 120$ shipped. thats a good price. it looks like the 2 i listed have different measurements for both TDS and EC. im a noob plz help lol thanks John

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Thanks for the reply. im just curious why they have a high range and low range. i dont want to purchase the low rang and then realize i need the other. both the models i listed do temps or am i missing something? also the 2 models im looking at are 120$ shipped. thats a good price. it looks like the 2 i listed have different measurements for both TDS and EC. im a noob plz help lol thanks John

That info came from my owners manual. It says the HI 9813-0 is the base model of the series which doesn't have the temperature reading the others in the line have.

This is a cut and paste from "BUBBLEGROWERS" The Grow Help thread that may help a little. Hit his "The Grow Help Thread" button in any of his posts and you will get a quick table of contents showing topics covered.

 

 

 

DECRYPTING EC/TDS METERS

 

there are 4 different types of meters that measure nutrient concentration, two are EC meters and two are TDS meters

 

of the 2 types of EC meters, (electrical conductivity), one displays with decimal places, the other without

 

for example

EC 2.0 and EC 2000 are the same

 

TDS meters come in 2 types, .5 and .7 conversion.

 

You seem to have a .5 conversion TDS meter

 

TDS meters take the electrical conductivity value that is measured internally by the meter (EC), but then multiplies the EC by a factor, either .5 or .7

 

so for example,

2000EC * .7= 1400ppm but also

2000EC * .5= 1000ppm

 

TDS is a strange beast and does not react logically, as you have found

 

for example 0-8-16 should read 1000ppm on .5 conversion meter, in RO water, but strangely, if you start with 250ppm water, and add the nutes, it wont necessarily come out to 1250, as you have noticed.

 

the reason I think this happens is that some of the TDS in the water gets neutralized by the nutes.

 

for example, much of the TDS in water is calcium, which is of very high pH. When nutes, of low pH are mixed in, some of the low and high values cancel each other out... this is sometimes called nute lockout and is the cause of some of the sediment in a res.

 

as far as the term TDS (total dissolved solids), in contrast to the term PPM (parts per million), they are the same thing stated in different words

 

here is an example of how the terms interact

 

An EC of 2000 corresponds to a TDS reading of 1400 PPM on a .7 conversion meter.

 

imho, .7 conversion is the primary hydroponic conversion factor, but many people own meters with .5 conversion, therefore, you MUST know your conversion, to understand my TDS numbers, which are all .7 values unless stated otherwise

 

in practical terms though, what you are doing is correct, and works fine, as you know

 

the gardner should mix nutes at the known recipe rate, then take a meter reading. WHATEVER that number is, regardless if its 1000, 1400, or any other number, THAT is the TDS of YOUR nutes in Your water, on Your meter.

 

As long as you dont change water or meters, keep using the baseline number you get as the target to go back to with nute additions

 

Im loving these questions! this is turning into a very complete archive of my beliefs

 

none of these ideas are original, Ive just spent a lot of time reading and learning from others

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