Stratos Multi E401N
101
6.2.2 Temperature Compensation during Calibration
Temperature Compensation during Calibration
The pH sensor’s slope is temperature-dependent. The measured voltage must therefore be corrected
by the temperature influence.
The buffer solution’s pH value is temperature-dependent. During calibration, the temperature of the
buffer solution must therefore be known so that the actual pH value can be obtained from the buffer
table.
Automatic Temperature Compensation
Stratos Multi measures the temperature of the buffer solution using the temperature probe integrated
in the pH sensor.
If the sensor does not have an integrated temperature probe:
• Connect an external temperature probe and select it in the Parameter Setting menu.
➜
pH Analog Wiring Examples, p. 168
• Set the manual temperature for calibration.
Settings can be changed in the Temperature Detection submenu:
Parameter Setting
[II] Analog …
Sensor Data
Temperature Detection ➜ Sensor Data, p. 66
6.2.3 Calibration/Adjustment Methods
• Calimatic: Automatic buffer recognition
• Manual: Manual entry of buffer values
• Product: Calibration by sampling
• Data entry: Data entry of premeasured sensors
• Temperature: Temperature probe adjustment
6.2.4 Calibration Mode: Calimatic
Calibration with Automatic Buffer Recognition
During automatic calibration with Knick Calimatic, the sensor is immersed in one, two, or three buffer
solutions. On the basis of the sensor voltage and the measured temperature, Stratos Multi
automati-
cally detects the nominal buffer value. The buffer solutions can be used in any order, but they must be
part of the buffer set defined during parameter setting. Calimatic accounts for the temperature depen-
dence of the buffer value. All calibration data are converted to a reference temperature of 25°C/77°F.
Calibration Procedure
NOTICE! Use only new, undiluted buffer solutions that are part of the configured buffer set.
Calibration
[I] [II] … pH
When you access calibration, the calibration values selected in the calibration presettings are used.
These settings can still be changed in the Calibration menu. If you do not want to perform calibration,
use the left softkey
to go back one level and abort the calibration.
01. Select “Calimatic” calibration mode and press enter to confirm.
✓ Number of calibration points and buffer set configured as in Cal Presettings .
➜
Calibration Presettings, p. 68
02. If required, change the number of calibration points and the buffer set.
03. Take the sensor out of the medium and rinse it in deionized water.
CAUTION! Risk of electrostatic discharge. Do not wipe the sensor or dab it dry.
04. Immerse the sensor in the first buffer solution.
To Next Page
Loading...