NAVI D-25 Instruction Manual page 194

● ORP standard solution
D-52/53/54/55
7.2 mV (oxidation-reduction potential [ORP]) measurement
There are two kinds of standards substances. Under
normal circumstances, it is sufficient to use only that
type of substance which is closest to the measured
value.
Indicated value of ORP standard solution at
various temperatures (mV)
160 - 22
temp.
Phthalic-acid
(ºC) chloride +
quinhydrone
5 +274.2
10 +270.9
15 +266.8
20 +262.5
25 +257.6
30 +253.5
35 +248.6
40 +243.6
160 - 51
Neutral
phosphate +
quinhydrone
+111.9
+106.9
+101.0
+95.0
+89.0
+82.7
+76.2
+69.0
7 Reference
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