Pressure measurement
Cerabar S/Deltabar S/Deltapilot S 4...20mA HART
12
Hauser
!
Note!
• You can also specify a customer-specific unit. See parameter description for PRESS. ENG. UNIT
(
Page 56).
4.2
Calibration without reference pressure
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the 0...+300 mbar (4.5
psi) measuring range, i.e. 0 mbar and 300 mbar (4.5 psi) are assigned to the 4 mA value and 20 mA
value respectively.
Prerequisite:
• This is a theoretical calibration, i.e. the pressure values for the
lower range and upper range value are known.
Description
1
Deltabar S: before configuring the device for your
application, the pressure piping must be cleaned and
filled with fluid. See Operating Instructions BA00270P,
Section 6.6.
P01-PMD75xxx-19-xx-xx-xx-000
P01-xxxxxxxx-05-xx-xx-xx-010
Fig. 1:
Calibration with reference pressure
1
See table, step 6.
2
See table, step 7.
2
Carry out position adjustment if necessary. See Page 53,
Table 6: POSITION ADJUSTMENT.
3
If necessary, select the "Pressure" measuring mode via
the MEASURING MODE parameter.
On-site display:
Menu path: GROUP SELECTION
MEASURING
MODE
Digital communication:
Menu path:
OPERATING MENU
SETTINGS
BASIC SETUP
MEASURING MODE
4
On-site display:
Select BASIC SETUP function group.
Menu path: GROUP SELECTION
OPERATING
MENU
SETTINGS
BASIC SETUP
5
Select a pressure unit via the PRESS. ENG. UNIT
parameter, here mbar for example.
6
The pressure for the lower range value (4 mA value) is
present at the device, here 0 mbar for example.
Select GET LRV parameter.
Confirm value present. The pressure value present is
assigned to the lower current value (4 mA).
7
The pressure for the upper range value (20 mA value) is
present at the device, here 300 mbar (4.5 psi) for
example.
Select GET URV parameter.
Confirm value present. The pressure value present is
assigned to the upper current value (20 mA).
8
Result:
The measuring range is set for 0...+300 mbar (4.5 psi).
+
–
20
4
I
[mA]
0
300
p
[mbar]
➀
➁