Endress+Hauser Deltabar PMD78B - Level Measurement Applications

Product description Deltabar PMD78B PROFINET with Ethernet-APL
12 Endress+Hauser
Applications for diaphragm seals
Diaphragm seal systems are used if the process and the device need to be separated.
Diaphragm seal systems offer clear advantages in the following instances:
• In the case of extreme process temperatures - through the use of temperature isolators
or capillaries
• In the case of strong vibrations - decouple the process from the device by using a
capillary
• In the case of aggressive or corrosive media - through the use of high-durability
membrane materials
• In the case of media that crystallize or contain solids - through the choice of suitable
coatings
• In the case of heterogeneous and fibrous process media
• If extreme measuring point cleaning is necessary, or in the event of very damp mounting
locations
• For mounting locations that are difficult to access
3.1.2 Level measurement (volume and mass):
Diaphragm seal with temperature isolator on both sides
h =
∆
p
ρ g
+ -
+
–
h
A0038339
h Height (level)
Δp Differential pressure
ρ Density of the medium
g Gravitational acceleration
Diaphragm seal on both sides with capillary
+ -
–
+
h =
∆
p
ρ g
h
A0038345
h Height (level)
Δp Differential pressure
ρ Density of the medium
g Gravitational acceleration