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D-Series
Models: S-Ch
Application
The diaphragm seal is a pressure transmitting, diaphragm-type device. The pressure signal is sent to the cooperating
pressure measuring device (pressure transmitter, pressure gauge) through manometric liquid filling the space between the
separating diaphragm of the seal and the pressure measuring device. The diaphragm seal task is to isolate the pressure
measuring device from damaging impacts caused by either medium or installation:
s High corrosiveness
s Low or high temperature, increased viscosity, and impurities
s Vibrations of the installation (remote diaphragm seal)
The material of both diaphragms and contact faces for the chemical-resistant diaphragm seals is corrosion resistant,
irrespective of the medium’s chemical composition and its expected concentration and temperature range.
Recommended minimum measuring range (bar)
depending on the type of the set: pressure measuring device - diaphragm seal
Diaphragm seal version Pressure
measuring device
Diaphragm
seal type
DN50 PN16 DN80 PN40
direct 0.4 0.1
Transmitter
remote 1 0.4
Available chemical-resistant materials
Diaphragm material Contact face material Over pressure limit
Monel Monel 40 bar
Hastelloy Hastelloy 40 bar
Nickel Nickel 40 bar
Tantalum Tantalum 16 bar
Tantalum Teflon 16 bar
Titanium Titanium 40 bar
Diaphragm seals with Teflon contact faces are more economical than tantalum seals
Additional absolute zero error resulting from ambient temperature fluctuations,
depending on the type of the set: pressure transmitter - diaphragm seal
Absolute zero error per 10°C for the diaphragm seal
Diaphragm seal type
DN50 DN80
direct 5 mbar 2 mbar
remote (2 m capillary) 10 mbar 4 mbar
An additional zero error, resulting from temperature fluctuations in a medium, depends on the temperature gradient in the oil -
based diaphragm sealing system. The error value is, in any case, significantly smaller than the error value shown in the table
Medium temperature range
-30...180°C for remote diaphragm seal
special versions up to 250°C
-30...150°C for diaphragm seal
Special versions
- Filling liquid – FLUOROLUBE
- Direct diaphragm seal for a medium temp. over
150°C
- Gold plated wetted parts material- after consulting
with Aplisens.
Important:
- contact face in diaphragram seal DN50 have a milled slot for a gasket (acc. to DIN 2512 FormN). Version without any
slot available on request. (acc. to DIN 2526 FormE)
- standard outlet capillary from flange:
direct mounted diaphragm seal - axial
remote mounted diaphragm seal - radial
Measuring Ranges
(17 Seiten)
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