Hello one, hello all.
Just recently started using EC/TDS readings, so totally a noob here. I'm using a cheap EC/TDS pen, so there's one or two things i'm trying to figure out.
Firstly, I wanted to calibrate this thing, so I got the bluelab 2.77 EC calibration solution. (=1385 ppm with 500 scale, =1940 ppm with 700 scale)
Now the problem with this cheap-ass pen is that it has no calibration option. No calibration button and no screw to dial in.
So I dip the pen into the calibration solution, and it reads:
3556 uS/cm2 = 3.56 mS/cm2 = 1775 ppm
(Calculating 3.56*500 equals 1780, so therefore this pen uses the 500 scale, which is the NaCl scale)
Now comparing that to the calibration values:
3.56-2.77= +0.79 difference in EC
1775-1385= +390 difference in TDS
So my pen is 0.79 over the EC value it should be reading, and 390 over the TDS value.
Does this mean that if I subtract these values from all future values it will be giving me an accurate reading?
Just recently started using EC/TDS readings, so totally a noob here. I'm using a cheap EC/TDS pen, so there's one or two things i'm trying to figure out.
Firstly, I wanted to calibrate this thing, so I got the bluelab 2.77 EC calibration solution. (=1385 ppm with 500 scale, =1940 ppm with 700 scale)
Now the problem with this cheap-ass pen is that it has no calibration option. No calibration button and no screw to dial in.
So I dip the pen into the calibration solution, and it reads:
3556 uS/cm2 = 3.56 mS/cm2 = 1775 ppm
(Calculating 3.56*500 equals 1780, so therefore this pen uses the 500 scale, which is the NaCl scale)
Now comparing that to the calibration values:
3.56-2.77= +0.79 difference in EC
1775-1385= +390 difference in TDS
So my pen is 0.79 over the EC value it should be reading, and 390 over the TDS value.
Does this mean that if I subtract these values from all future values it will be giving me an accurate reading?
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