Knick Protos 3400, User Manual

Page: 117 / 212

117
For automatic cal temp detection, the Protos
measures the temperature of the buffer solu-
tion with a temperature probe (Pt 100/Pt 1000/
NTC 30 kΩ/NTC 8.55 kΩ). If you work with
automatic temperature compensation during
calibration, a temperature probe connected to
the temperature input of the Protos must be in
the buffer solution! Otherwise, you must select
manual entry of calibration temperature.
Temperature Compensation During Calibration
Calibration / Adjustment
Temperature Compensation
Calimatic
Return
Cal medium: Buffer solution
Knick 2.00 4.01 7.00 9.21
When changing sensors perform
First cal for statistics!
Measured cal temp
25.6 °C
7.00 pH
+025.6 °C
Proceed
Sensor replacement
Manual Temperature Compensation
Automatic Temperature Compensation
The temperature of the buffer solution must be
entered manually in the Parameter setting menu
at "Parameter setting / <pH module> / Sensor
data / Temp detection / Cal temp --> manual".
Temperature measurement is performed using a
glass thermometer, for example.
Temp detection (Administrator)
Return
Temperature probe
Measuring temp
Cal temp
25.6 °C
7.00 pH
+025.6 °C
Proceed
Manual
There are two important reasons for determining the temperature of the buffer
solution:
The slope of the pH electrode is temperature-dependent. Therefore the
measured voltage must be corrected by the temperature influence.
The pH value of the buffer solution is temperature-dependent. For calibration,
the buffer solution temperature must therefore be known in order to choose
the actual pH value from the buffer table.
During parameter setting you define whether cal temperature is measured
automatically or must be entered manually:
Manual
Auto
Pt 1000
Manual
Auto