Xylem Sentix ORP 900 - Manual (Page 5)

SenTix Commissioning, measuring, checking
15 ba75845e01 08/2009
At the same time, the level of the reference electrolyte must be at least 2
cm above the level of the solution.
Conversion to
normal hydrogen
electrode
U
H
= U
Meas
+ U
Ref
U
Ref
is temperature dependent and can be taken from the following table (see
also DIN 38404-6):
SenTix
®
ORP 900
with: U
H
= ORP, referring to the normal hydrogen electrode
U
Meas
= Measured ORP
U
Ref
= Voltage of the reference system compared to the normal
hydrogen electrode
T (°C) T (°F) U
Ref
[mV] T (°C) T (°F) U
Ref
[mV]
SenTix
®
ORP 900 SenTix
®
ORP 900
0 32 +224 35 95 +200
5 41 +221 40 104 +196
10 50 +217 45 113 +192
15 59 +214 50 122 +188
20 68 +211 55 131 +184
25 77 +207 60 140 +180
30 86 +203