Technical information

Deltabar M PMD55
Endress+Hauser 3
Function and system design
Measuring principle
P01-PMD55xxx-03-xx-xx-xx-001
Measuring cell of the Deltabar M
1 Sensing element
2 Overload diaphragm/Middle diaphragm
3 Filling oil
4 Process isolating diaphragm
The separating diaphragms (4) are deflected on both sides by the acting pressures p
1
and p
2
. A filling oil (3)
transfers the pressure to a resistance circuit bridge (semi-conductor technology). The differential-pressure-
dependent change of the bridge output voltage is measured and further processed.
Level measurement (level,
volume and mass)
Design and operation mode
P01-PMD55xxx-15-xx-xx-xx-002
Level measurement with Deltabar M;
left: V1 version; vertical impulse lines; 90° alignment
middle: H1 version; horizontal impulse lines; 180 ° alignment
right: H2 version; horizontal impulse lines; 90° alignment
h Height (level)
p Differential pressure
 Density of the medium
g Gravitation constant
Your benefits
• Volume and mass measurements in any tank shapes by means of a freely programmable characteristic curve
• Choice of diverse level units
• Has a wide range of uses, e.g.
– for level measurement in tanks with superimposed pressure
– in the event of foam formation
– in tanks with agitators of screen fittings
– in the event of liquid gases
– for standard level measurement
1
p
2
p
1
2
3
4
h=
Dp
r g
+
–
h
PMD55, H1
h=
Dp
r g
+
–
h
PMD55, H2
h=
Dp
r g
+
–
h
PMD55, V1