Hi,

How to have rh value with Profilux?
Redox value depend of ph, rh no.
rH = (ORP / 30) + (2 * pH)

I tried with Dynamic Nominal Value / virtual probe but not seen how...

Thank


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A Wide Range of Variant Formulas

Generic:
rH = (ORP / 30) + (2 * pH)

Per Patrick Flanagan, the Clark equation for deriving rH from pH and ORP is:
rH = ((ORP + 200) / 30) + (2 * pH)

The formula from Siegfried Luebke (aka Lubke or Leubke), the amazing Austrian organic farmer:
rH = ((ORP + 210) / 30) + (2 * pH)

EIT formula from Microhydrin’s Early Days:
rH = (Eh / 0.029) + (2 * pH)
I suspect there is a major typographic error in the formula

Formula Found in Several Places in Aquarium World Websites:
Per formula: Reef Central Aquarium website; the 6.67 constant added is for "dissolved oxygen":
rH = (ORP / 29) + (2 * pH) + 6.67

Per the Yokagawa ORP/pH/rH Meter Products Tech Info Sheet:
The Yokagawa spec sheet for their digital meter provides the basic formula as:
Eh (ORP) = 59.16 (2 * pH - rH)
which, using my rusty algebra, yields:
rH = 59.16 * (2 * pH) - ORP

Unmodified Nernst/Clark Formula, from Several Papers:
Eh = 1.23 – ((RT / F) pH) – (RT/ 4F) * ln (1 / Po)