Standard Version
Information on applications, features, metrological infl uences
as temperature, level difference, fl oating time and others can
be found in model overview 7000. Furthermore you will also
fi nd advices on other chemical seal versions.
Construction
Model 73..vd8 has an orifi ce d8 as instrument connection for
welding to a pressure gauge with process connection d8x5, e.g.
RCh 100-3vDW.
For the welded connection to pressure gauge / chemical seal and
the fi lling port which is not accessible externally could no leakage
occur. The parts are easy to clean externally.
Model 73..vG1⁄2 has a measuring instrument adapter with female
thread for direct mounting to the measuring instrument with external
thread.
The screwed connections pressure gauge / chemical seal and the
fi lling port may not be loosened, as otherwise the fi lling fl uid leaks
and the pressure measuring system loses its functional capability.
Chemical Seal and Process Connection
1.4435 (316 L stainless steel)
Instrument Connection
73..vd8: orifi ce d8
73..vG1⁄2: G 1⁄2 female
Diaphragm
1.4435 (316L stainless steel) fl ush welded, welded to chemical seal,
helium leak detection up to 10-9 mbar l/s
Effective diaphragm diameter dM, see table on page 2 ff.
Surface Roughness of the Wetted Parts
Ra < 0.8 μm
Union Nut (if applicable)
Stainless steel
Nominal Pressure
See tables on page 2 ff.
Minimum Span Pressure Gauges
See tables on page 2 ff.
t
K-value (mbar /10K) (temperature coeffi cient of the chemical seal)
See tables on page 2 ff. (for vegetable oil FN 1)
Options
• Wetted parts Ra < 0.4 μm
• Wetted parts electropolished
• Reinforced groove nut
• Calculation of the temperature-related additional error for the
whole pressure measuring system
Special Options among others
• Other instrument connections upon request,
but NPT-female thread is not recommendable
• Other material combinations upon request
• Version according to other norms and nominal sizes
upon request
Accessories
Capillary line, cooling elements: see data sheet 7002
Process connection pieces and sealings do not belong to the
standard product range, but are available upon request.
Construction / Filling / Certificates
Information concerning mounting and fi lling and certifi cates are
available upon request.
Ordering Information Chemical Seals
Please regard our detailed ordering information
• in model overview 7000
• in the check lists for pressure measuring instruments
with chemical seals and
• in the data sheets of the requested pressure measuring instruments
and add the information for the particular chemical seal:
– Model : e.g. MDM 7310 vd8, MDM 7315 vG1⁄2
– Nominal size: e.g. NW 1″, DN 25
– Nominal pressure: e.g. PN 25, PN 40
if applicable options: see page 1, e.g. Ra < 0.4 μm
The reference temperature is +20 °C.
Please specify, if a +20°C deviating working temperature (tA)
is required (dial inscription tA…) or the cleaning temperature
(tR max) is +150 °C and above (dial inscription tR max)
Example: pressure gauge….,
chemical seal: MDM 7310vd8, DN 25, PN 40, tA +80°C,
wetted parts electropolished
Dimensional Data (mm), Weights (kg), Minimum Span (bar) and t k-value (mbar /10K)
Dimensional Data (mm), Weights (kg), Minimum Span (bar) and tk-value (mbar /10K)
Dimensional Data (mm), Weights (kg), Minimum Span (bar) and tk-value (mbar /10K)
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