Endress+Hauser Deltabar S PMD70 User Manual

Commissioning Deltabar S FOUNDATION Fieldbus
26 Endress+Hauser
6.4 Flow measurement
6.4.1 Preparatory steps
!
Note!
• The Deltabar S PMD70 or PMD75 is usually used for flow measurement.
• Before calibrating the Deltabar S, the impulse piping must be cleaned and filled with fluid.
 See the following table.
POS. INPUT VALUE
Input
Position adjustment – the pressure difference between zero (set point) and the measured pressure
need not be known. To correct the pressure difference, you need a reference measurement value (e. g.
from a reference device).
Example:
– MEASURED VALUE = 0.5 mbar
– For the POS. INPUT VALUE parameter, specify the desired set point for the MEASURED VALUE,
e.g. 2 mbar. (The following applies: MEASURED VALUE
new
= POS. INPUT VALUE)
– MEASURED VALUE (after entry for POS. INPUT VALUE) = 2.0 mbar
– The CALIB. OFFSET parameter displays the resulting pressure difference (offset) by which the
MEASURED VALUE was corrected.
The following applies: CALIB. OFFSET = MEASURED VALUE
old
– POS. INPUT VALUE,
here: CALIB. OFFSET = 0.5 mbar – 2.0 mbar = – 1.5 mbar)
Factory setting:
0.0
CALIB. OFFSET
Entry
Position adjustment – the pressure difference between zero (set point) and the measured pressure is
known. (A reference pressure is not present at the device.)
Example:
– MEASURED VALUE = 2.2 mbar
– Via the CALIB. OFFSET parameter, enter the value by which the MEASURED VALUE should be
corrected. To correct the MEASURED VALUE to 0.0 mbar, you must enter the value 2.2 here.
(The following applies: MEASURED VALUE
new
= MEASURED VALUE
old
– CALIB. OFFSET)
– MEASURED VALUE (after entry for calib. offset) = 0.0 mbar
Factory setting:
0.0
Parameter name Description

Endress+Hauser Deltabar S PMD70 Specifications

General

Brand	Endress+Hauser
Model	Deltabar S PMD70
Category	Measuring Instruments
Language	English