Endress+Hauser Cerabar S PMP7, Operating Instructions Manual

Page: 9 / 56

Cerabar S 4 to 20mA HART Pressure measurement
Hauser 9
4.2 Calibration without reference pressure
Example:
In this example, a device with a 400 mbar (6 psi) sensor is configured for the 0 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 range and upper range value are known.
!
Note!
• See also Operating Instructions for Cerabar S (BA00412P), "Pressure measurement" section.
• Due to the orientation of the device, there may be a shift in the measured value, i.e. when the
container is empty or partially filled, the MEASURED VALUE parameter does not display zero.

For information on how to perform position adjustment, see also Page 12, Table 3: Position
adjustment.
• 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 perform calibration without reference pressure by means of the QUICK SETUP
menu.

See Page 11 ff, Table 2: QUICK SETUP menu.
• You can also specify a customer-specific unit. See parameter description for PRESS. ENG. UNIT
(

Page 15).
Description
1 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
P01-PMP71xxx-19-xx-xx-xx-000
P01-MIDxxxxx-05-xx-xx-xx-004
Fig. 2: Calibration without reference pressure
1 See Table, Step 4.
2 See Table, Step 5.
2 Onsite display:
Select BASIC SETUP function group. Menu path:
GROUP SELECTION

OPERATING MENU

SETTINGS

BASIC SETUP
3 Select a pressure unit via the PRESS. ENG. UNIT
parameter, here mbar for example.
4 Select SET LRV parameter.
Enter value, here 0 mbar, for the SET LRV parameter
and confirm. This pressure value is assigned to the lower
current value (4 mA).
5 Select SET URV parameter.
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).
6 Result:
The measuring range is configured for 0 to +300 mbar
(4.5 psi).
20
4
I
[mA]
0 4
p
[bar]
➀
➁