Endress+Hauser Cerabar S PMP7, Operating Instructions Manual

Page: 8 / 56

Pressure measurement Cerabar S 4 to 20mA HART
8 Hauser
4 Pressure measurement
4.1 Calibration with reference pressure
Example:
In this example, a device with a 10 bar (150 psi) sensor is configured for the 0 to +4 bar (60 psi)
measuring range, i.e. 0 bar is assigned to the 4 mA value and 4 bar (60 psi) to the 20 mA value.
Prerequisite:
• The pressure values 0 bar and 4 bar (60 psi) can be specified. The device is already installed, for
example.
!
Note!
• See also Operating Instructions for Cerabar S (BA00412P), "Pressure measurement" section.
• For a description of the parameters mentioned, see
– Page 10, Table 1: MEASURING MODE
– Page 12, Table 3: POSITION ADJUSTMENT
– Page 14, Table 4: BASIC SETUP.
• For a description of further relevant parameters, see
– Page 17, Table 5: EXTENDED SETUP
– Page 29, Table 12: PROCESS VALUES.
!
Note!
• You can also specify a customer-specific unit. See parameter description for PRESS. ENG. UNIT
(

Page 15).
Description
1 Carry out position adjustment if necessary. See Page 12,
Table 5: POSITION ADJUSTMENT.
P01-MIDxxxxx-05-xx-xx-xx-004
Fig. 1: Calibration with reference pressure
1 See Table, Step 5.
2 See Table, Step 6.
2 If necessary, select the "Pressure" measuring mode via
the MEASURING MODE parameter.
Onsite display:
Menu path: GROUP SELECTION

MEASURING
MODE
Digital communication
Menu path: OPERATING MENU

SETTINGS

BASIC SETUP

MEASURING MODE
3 Onsite display:
Select BASIC SETUP function group. Menu path:
GROUP SELECTION

OPERATING MENU

SETTINGS

BASIC SETUP
4 Select a pressure unit via the PRESS. ENG. UNIT
parameter, here mbar for example.
5 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).
6 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).
7 Result:
The measuring range is configured for 0 to +300 mbar
(4.5 psi).
20
4
I
[mA]
0 4
p
[bar]
➀
➁