Originally Posted by
DaveB22
So I take it the jist of all that is:
The Vivosun meter reads in mico-siemens (?S) and the PPM reading is on the Hanna (500) reference scale so,
When in EC Mode, if that meter reads 968 ?S, you convert that 968 ?S value to milli-siemens (mS) by multiplying 968 ?S by 1000 to get 968 mS (which is normally referred to as an EC value of 0.968ec).
You can then convert to ppm by multiplying the 968 mS (milli-siemens) value by .5 to get 484ppm.
That is why the meter in EC mode would read 968 ?S/cm (which is also = 0.968 mS/cm) and 484ppm when in PPM Mode
However, for those who like simple things, with that meter, if you drop all the ?S/mS reference confusion and simply remember:
In EC mode:
A displayed value of 1000 = 1.0ec. A displayed value of 500 = 0.5ec.
You can simply take the displayed value (eg: 968) and multiply it by .5 to get the ppm value (eg: 968 * .5 = 484ppm)
In PPM Mode:
You can simply convert the PPM value (eg: 484) back to EC ?S/cm by dividing the displayed value by .5 (484/.5 = 968?S)
You can simply convert the PPM value (eg: 484) back to EC mS/cm by dividing the displayed value by 500 (484/500 = 0.968mS)
Dave
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