Selecting linearisation
Two vessel characteristics are available: linear or horizontal cylinder
Note!
•
The switch on the left on the FEC 12 electronic insert must be moved to the left
so that linearisation can be carried out remotely with the handheld terminal.
Step
Entry
Cursor in display at
Significance
1 2
EXTENDED CALIBRATION
Extended calibration
2
1
LINEARISATION
Selecting linearisation
e.g. LINEAR
Level is proportional to volume,
i.e. the cross-section of the vessel remains
constant over the entire distance
3
HORIZ. CYL.
Horizontal cylinder : the measured value
directly corresponding to volume
4
F4 [ENTER]
Confirms entry, value to be transmitted
Empty and full
calibration
Step
Entry
Cursor in display at
Significance
1 1
CALIBRATION
Basic calibration
2
2
EMPTY CALIBRATION
Empty calibration
3 0.0
0.0
Vessel is empty, a 4 mA signal is output
at the entered level or volume
4
F4 [ENTER]
Confirms entry, value to be transmitted
5
3
FULL CALIBRATION
Full calibration
6 100.0
100.0
Vessel is full, a 20 mA signal is output
at the entered level or volume
7
F4 [ENTER]
Confirms entry, value is transmitted
Note!
•
You can also calibrate in technical units, see also 4 mA/20 mA value, p 13. In this
case, if a horizontal cylinder is selected, the entries must be made in volume units!
4.3 Extended Calibration using the HART Communicator 275
4 mA threshold
The factory settings allow a current range from 3.8 mA to 20 mA and larger. Since a
current less than 4 mA could result in unwanted responses by process control
systems, it is possible to set a threshold of 4 mA on the current output, below which it
cannot fall.
Step
Entry
Cursor in display at
Significance
1 1
CALIBRATION
Basic calibration
2
4
MIN. CURRENT 4 mA
Current output at minimum 4 mA
ON
Threshold is at 4.0 mA
3
OFF
Current range begins at 3.8 mA
4 F4
[ENTER]
Confirms entry, value is transmitted
Note!
•
At factory setting the 4 mA threshold is switched off
Note!
Note!
4 Calibrating
Electronic insert FEC 12 (HART)
12
Hauser
