B l u e B o x – C a l i b r a t i o n g a l v . O x y g e n S e n s o r
GO Systemelektronik GmbH Faluner Weg 1 24109 Kiel Germany Tel.: +49 431 58080-0
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Appendix C – Calibration of a Galvanic Oxygen Sensor
The galvanic oxygen sensor is an electrochemical sensor. To function properly, electrochemical sensors have
to be recalibrated at regular intervals. This is best done weekly, but at least monthly.
There are three ways of calibrating a galvanic oxygen sensor.
1.
Saturation calibration – Calibration in air
2.
Reference calibration – Calibration with a reference measuring instrument
3.
Offset calibration
– Zero calibration with a reference fluid
Press in the parameter display on [Menu] and in the main menu on [Sensors], then on the desired sensor and
then on [Calibration].
For protection against unauthorized use, there is a password protection for this function. The password is in
the configuration data sheet. see
6 The Configuration Data Sheet
there
1. BlueBox
at
BlueBox Password (PIN)
[<–] leads to the start window of the calibration
1. Saturation calibration
Hold the oxygen sensor in the air. Wait at least 10 minutes until the displayed values are stable.
∗
Start window of the calibration
Further with [100% Cal.]
Back with [–>]
[Save] save and exit calibration
[–>] Leads to a confirmation menu
2. Reference calibration
Immerse the oxygen sensor in your measurement medium. Wait until the displayed values are stable.
Start window of the calibration
Further with [mg/l Cal.]
Back with [–>]
Input: Oxygen content of the
measuring medium according to
the reference measuring instru-
ment, here for example 10.02
Further with [Ok]
Back with [<–]
[Save] save and exit calibration
[–>] leads to a confirmation menu
∗
The galvanic cell for oxygen measurement is located at the bottom of the sensor body, the temperature sensor is near the
center. Therefore, a saturation calibration in the air can only be carried out when the entire sensor body has reached the tem-
perature of the ambient air. The larger the difference in temperature between the measuring medium and the ambient air, the
greater the time required for a temperature adjustment (30 minutes or more, if applicable).
The temperature adjustment can be accelerated by immersing the sensor in water, which has approximately the temperature
of the ambient air, before performing the saturation calibration.
Moreover, abrupt temperature changes (e.g., by direct exposure to the sun) must be avoided.
<–
Main menu
System
Sensor list
Actuators
Service
User
08 :14 :45
12 .09 .17
Help
Menu
14.0
0.0
Oxygen 1
8.79 mg/l
09:25:39
10.06.17
<–
1/1
Sensors
Oxygen 1
Oxygen 2
Sensor 2
Sensor 1
09 :19 :39
10 .07 .10
<–
Oxygen
Calibration
Table
Diagram
Info
Selected
selected
Password
****
1
2
3
4
5
6
7
0
8
9
<
<–
Oxygen 1
Oxygen Calibration
8.79 mg/l
->
100% Cal.
mg/l Cal.
16.84mV / 21.66°C
Oxygen 1
Result
100 %
->
Save
8.77mg/l / 21.66°C
10.34 mg/l
19.81mV / 21.66°C
Oxygen 1
Oxygen Calibration
->
100% Cal.
mg/l Cal.
Enter reference
in mg/l
1
2
3
4
5
6
7
8
9
0
.
-
<
<-
Ok
10.02
Oxygen 1
Result
10.02 mg/l
114.02% / 21.65°C
Save
->
