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Calibration and
measurement:
General rules
Conversion to the
standard hydrogen
electrode potential
T 814252
05/2014
•
Avoid the carryover of any solution (sample or buffer solution) from one
measurement to the next by taking the following measures:
− Shortly rinse the calibration and sample beakers with the solution the
beakers are to be fi lled with next.
− Between measurements, rinse the electrode with the solution that fol lows.
Alternatively, you can also rinse the electrode with deionized water and then
carefully dab it dry.
•
To measure it is recommended to immerse the electrode in a vertical or
slightly tilted position.
•
Observe the correct depth of immersion and make sure the contact
between the junction and test sample is thorough. The junction is in the area
of the bottom end of the shaft.
Caution:
The combination electrode should be immersed up to the shaft party only!
U
= U
+ U
H
Meas
Ref
where:
U
= ORP voltage, relative to the standard hydrogen electrode
H
U
= measured ORP voltage
Meas
U
= voltage of the reference system relative to the standard hydrogen
Ref
electrode
U
is temperature dependent and can be taken from the following table
Ref
(also refer to DIN 38404-6):
U
Ref
T (°C)
BlueLine
31 Rx IDS
0
+224
5
+221
10
+217
15
+214
20
+211
25
+207
30
+203
Commissioning, measuring, calibration
[mV]
T (°C)
BlueLine
32 Rx IDS
+221
35
+216
40
+212
45
+207
50
+202
55
+197
60
+192
U
[mV]
Ref
BlueLine 31
BlueLine 32
Rx IDS
Rx IDS
+200
+187
+196
+181
+192
+176
+188
+171
+184
+165
+180
+160
15
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