MemoTrans
30
Function
Options
Info
Function
Selection
• Off
• On
Factory setting
Off
Switches the function on or off
Warning limit
0.0
…
50.0 %
Factory setting
5.0 %
Specify your limit values for monitoring the slope differential.
Diagnostics code and associated message text:
518
Sensor calibration
11.3.5 Zero Point and Operating Point
pH, ISFET, Oxygen
Path:
Application
Sensor
Extended setup
Diagnostic settings
Function
Options
Info
pH, pH/ORP
Zero point (pH glass)
Operating point (ISFET)
The zero point or operating point characterizes the condition of the
sensor reference. The bigger the deviation from the ideal value (pH
7.00), the poorer the condition. This can be caused by KCl dissolving
away or reference contamination, for example.
Upper warning limit
Upper warning limit
pH 6.00
…
12.00
1)
Upper warning limit
950 mV
2)
Factory setting
pH 8.00 / 500 mV
Diagnostics code and associated message text:
505
Sensor calibration
515
Sensor calibration
2)
Lower warning limit
Lower warning limit
pH 2.00
…
8.00
1)
Lower warning limit
5000 mV
2)
Factory setting
pH 8.00 / 500 mV
Diagnostics code and associated message text:
507
Sensor calibration
517
Sensor calibration
2)
Oxygen
Zero point
The zero point corresponds to the sensor signal that is measured in a
medium in the absence of oxygen. You can calibrate the zero point
in water that is free from oxygen or in high-purity nitrogen.
This improves accuracy in the trace range.
Warning limit
0.0
…
10.0 nA
Factory setting
3.0 nA
Specify the limit values for zero point monitoring in your sensor.
Diagnostics code and associated message text:
513
Zero warning
1)
pH glass
2)
pH ISFET