Diaphragm seals are used to separate the pressure medium from the measuring element of the pressure gauge (or pressure switch). This means that pressures can also be measured in hygienic applications and with corrosive or pasty media.
Diaphragm seals are manufactured according to DIN or ANSI standards.
Depending on the model, the following materials of the wetted parts are available for selection:
- Stainless steel AISI 316
- Stainless steel AISI 316 mit PTFE coating
- Monel 400
- Hastelloy® C276
- Hastelloy® B2
- Tantal
- Icolloy 825
- Inconel 600
PDF: Overview datasheet "Diaphragm seals":
Selection recommendations and notes on material resistances
04.1B0 + 04.1BS
Process connection: thread
from 0...0.1 to 0...40 bar + -1...0 bar
Can be disassembled for cleaning
04.111
Process connection: thread
from 0...6 to 0...250 bar
Can be disassembled for cleaning
04.2B0
Process connection: thread
from 0...1 to 0...160 bar + -1...0 bar
Many materials to choose from
For demanding continuous operation
Option: overload proof up to 210 bar
04.3A0 + 04.3B0
Process connection: flange
from 0...1 to 0...250 bar + -1...0 bar
Flange connection with through holes
Option: PTFE coating
04.600
Process connection: flange
from 0...1 to 0...40 bar + -1...0 bar
Option: PTFE coating
04.400
Process connection: flange
from 0...1 to 0...40 bar
Flange with through holes
Quasi-front flush
Cost-effective realization of various wetted materials
Option: PTFE coating
04.MIA + 04.MIB
Process connection: thread
from 0...1 to 0...400 bar + -1...0 bar
Compact
Very good price-performance ratio
04.SAN
Process connection: clamp
DIN 11851, SMS681, RJT/APV, IDF/ISS
from 0...1 to 0...40 bar
hygienic applications and food technology
Surface 0.76...0.38 µm
04.AL
Process connection: clamp
ISO 2852 1 1/2", 2" or 2 1/2"
from 0...1 to 0...40 bar
hygienic applications and food technology
Surface 0.76...0.38 µm
04.R00
Process connection:
for welding into or flanging to pipelines
from 0...6 to 0...250 bar
04.367
process connection: thread
flush diaphragm
from 0...40 to 0...400 bar
Flush diaphragm in the diameter of the process connection thread
04.WAF
Process connection: cell diaphragm seal for mounting in suitable flanges (DIN or ANSI)
from 0...160 mbar to 0...160 bar
Diaphragm seals are separators that are connected to a pressure gauge directly or via a capillary line. They allow the measurement of process media when
- these are too hot for the measuring element of the pressure gauge,
- in case of direct contact, the wetted parts of the pressure gauge will corrode or be attacked,
- these are very viscous (tough) or contain sediments,
- these harden with temperature changes (e.g. adhesives)
- dead rooms are to be avoided for hygienic reasons (food industry).
Diaphragm seals are also used where the pressure measuring point and the place where the pressure is to be read are remote from each other, e.g. for safety reasons with hazardous media.
Diaphragm seals are also used where the pressure measuring point and the place where the pressure is to be read are remote from each other, e.g. for safety reasons with hazardous media.
Manometer = pressure gauge
Rohrfeder = bourdon tube
Füllflüssigkeit = filling fluid
Druckmittler = diaphragm seal
Kugel und Füllstift = ball and filler pen
Elastische Membran = elastic membrane
Prozessanschluss = process connection