27
TDOCT-
3147_E
NG
259858
08/
2013
Pressure Transmitter LHCR-51, LHCS-51
Commissioning
5.4.3
Level selection "in pressure"
Calibration with reference pressure (wet calibration)
Example:
In this example, the level in a tank should be measured in "m". The maximum level is 3 m
(9.8 ft). The pressure range is set to 0 mbar to 300 mbar (4.5 psi).
Prerequisite:
•
The measured variable is in direct proportion to the pressure.
•
The tank can be filled and emptied.
The values entered for "Empty calib./Full calib." and" Set LRV/Set URV" must
be at least 1 % apart. The value will be rejected, and a message output, if the
values are too close together. Other limit values are not checked, i. e. the
values entered must be appropriate for the sensor and the measuring task for
the device to be able to measure correctly.
Description
1 Perform "position zero adjustment
→
Calibration with reference pressure (wet calibration)
1
See Table, Step 7.
2
See Table, Step 8.
2 Select the "Level" measuring mode via the
"Measuring mode" parameter.
Menu path: Setup
→
Measuring mode
3 Select a pressure unit via the "Press eng. unit"
parameter, here "mbar" for example.
Menu path: Setup
→
Press. eng. unit
4 Select the "In pressure" level mode via the "Level
selection" parameter.
Menu path: Setup
→
Extended setup
→
Level
→
Level selection
5 Select a level unit via the "Output unit" parameter,
here "m" for example.
Menu path: Setup
→
Extended setup
→
Level
→
Output unit
6 Select the "Wet" option via the "Calibration mode"
parameter.
Menu path: Setup
→
Extended setup
→
Level
→
Calibration mode
7 1. The hydrostatic pressure for the lower
calibration point is present at the device, here
"0 mbar" for example.
2. Select the "Empty calib." parameter.
3. Enter the level value, here "0 m" for example.
Confirming the value means you assign the
pressure value present to the lower level
value.
Menu path: Setup
→
Extended setup
→
Level
→
Empty calib.
NOTICE
3
0
h
[m]
0
300
p
[mbar]
1
2
DOCT3147_eng.book Seite 27 Freitag, 16. August 2013 4:58 16
