35
TDOCT-
3147_E
NG
259858
08/
2013
Pressure Transmitter LHCR-51, LHCS-51
Commissioning
5.5
Pressure measurement
5.5.1
Calibration without reference pressure (dry calibration)
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the
0 mbar to +300 mbar (4.5 psi) measuring range, i. e. 0 mbar is assigned to the 4 mA value
and 300 mbar (4.5 psi) to the 20 mA value.
Prerequisite:
This is a theoretical calibration, i. e. the pressure values for the lower and upper range are
known.
Due to the orientation of the device, there may be pressure shifts in the
measured value, i. e. the measured value is not zero in a pressureless
condition. For information on how to perform position adjustment,
see
→
Description
1 Select the "Pressure" measuring mode via the
"Measuring mode" parameter.
Menu path: Setup
→
Measuring mode
Calibration without reference pressure
1
See Table, Step 3.
2
See Table, Step 4.
2 Select a pressure unit via the "Press eng. unit"
parameter, here "mbar" for example.
Menu path: Setup
→
Press. eng. unit
3 Select the "Set LRV" parameter.
Menu path: Setup
→
Set LRV
Enter the value for the "Set LRV" parameter (here
0 mbar) and confirm. This pressure value is
assigned to the lower current value (4 mA).
4 Select the "Set URV" parameter.
Menu path: Setup
→
Set URV
Enter the value for the "Set URV" parameter (here
300 mbar (4.5 psi)) and confirm. This pressure
value is assigned to the upper current value
(20 mA).
5 Result:
The measuring range is configured for
0 mbar to +300 mbar (4.5 psi).
NOTICE
20
4
I
[mA]
0
300
p
[mbar]
1
2
DOCT3147_eng.book Seite 35 Freitag, 16. August 2013 4:58 16
