Stratos Multi E461N
147
7.6.6 Calibration Mode: Zero Point
Zero Correction
For trace measurements below 500 ppb, the zero point should be calibrated. (TAN option FW-E015,
“Oxygen Measurement in Low Oxygen Concentrations”)
If a zero correction is performed, the sensor should remain for at least 10 to 60 minutes in the
calibration medium (media containing CO
2
: at least 120 min) to obtain stable, non-drifting values.
During zero correction, a drift check is not performed.
Calibration Procedure
Calibration
[I] [II] … Oxy
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 “Zero Point”
Calibration Mode
and press
enter
to confirm.
02.
Press the
right softkey: Next
.
✓
Zero correction is carried out. The measured sensor current is displayed.
03.
Enter the input current for the zero point.
04.
Press the
right softkey: Next
.
Result
✔
The calibration record is displayed. By pressing the
right softkey: Adjust
, the calibration values
obtained during calibration for calculation of the process variables are applied to the device.
When using a Memosens sensor, the calibration values are saved in the sensor.
7.6.7 Calibration Mode: Temperature
Adjustment of the Temperature Probe
This function is used to adjust the individual temperature probe tolerances or cable lengths for the
purpose of increasing the accuracy of the temperature measurement.
The adjustment requires an accurate measurement of the process temperature using a calibrated ref-
erence thermometer. The measurement error of the reference thermometer should be less than 0.1 K.
Adjustment without an accurate measurement may result in falsification of the displayed measured
value.
When using Memosens sensors, the adjustment value is saved in the sensor.
Calibration Procedure
Calibration
[I] [II] [Sensor]
01.
Select “Temperature”
Calibration Mode
and press
enter
to confirm.
02.
Enter the measured process temperature and press
enter
to confirm.
✓
The temperature offset is displayed.
03.
Adjust the temperature probe with the
right softkey: Save
.
The current adjustment and temperature offset data can be displayed in the Diagnostics menu:
Diagnostics
[I] [II] [Sensor]
Temp. Offset Log