Endress+Hauser Cerabar S Series - Dry Calibration

6.3 Dry calibration
The dry calibration is a calculated calibration, which can be made with an empty tank or
on the test bench. The "empty" calibration point is normally at the sensor mounting point.
If the measurement is to begin at another level, then this must be considered in the
calculation. The prerequisites for a dry calibration are:
• The empty and full levels are known.
• The density factor is known.
• The pressure for »empty« and »full« has been calculated (p = ρgh).
If the device has a display and the point of mounting is below the empty level, then a
bias pressure must be entered in "Set Bias Pressure" (position correction).
"Level linear"
# Parameter Entry Significance
1 Default
Value
5140 Reset to
factory setting
2 Select Press
Unit
e.g. mbar Select pressure
unit
3 Set Bias
Pressure
e.g. 100,
= Lower
Range
Value
For display
module
bias pressure
4 Lower Range
Value
e.g. 100 Pressure for
"empty"
5 Upper Range
Value
e.g. 400 Pressure for "full"
6 Linearization "level
linear"
Operating mode
7 Start Point e.g. 0 Level for "empty"
8 Full Scale e.g. 300 Level for "full"
9 Unit After Lin e.g. hl Select level units
Result:
• Level is displayed in "Measured Value".
"Level horizontal
cylinder"
# Parameter Entry Significance
1 Default
Value
5140 Reset to
factory setting
2 Select Press
Unit
e.g. mbar Select pressure
unit
3 Lower Range
Value
e.g. 100 Pressure for
"empty"
4 Upper Range
Value
e.g. 400 Pressure for "full"
5 Linearization "level
horizontal
cylinder"
Operating mode
6 Start Point e.g. 0 Level for "empty"
7 Full Scale e.g. 200 Level for "full"
8 Unit After Lin e.g. hl Select level units
Result:
• Level is displayed in "Measured Value".
Check after installation After a calibration, the first filling of the tank should be carefully observed, so that any
errors or uncertainties are immediately detected.
1 m
3 m
0 m
4 m
BA211Y49
Upper Range
Value
Full Scale
Lower Range
Value
Start Point
2 m
BA211Y50
Upper Range
Value
Full Scale
Lower Range
Value
Start Point
6 Level Measurement Cerabar S FF
42 Endress+Hauser