Diaphragm Seals Flange Type

Application

Diaphragm seals of the type series 75.. are suitable for aggressive,
contaminated and hot media.
Numerous common pressure gauges of our supply programme can
be equipped with these chemical seals, but also pressure switches,
pressure transmitters and pressure transducers, depending on the
nominal case size of the chemical seal up to PN 10/40 or Class 150.

Construction
The diaphragm is welded free of dead space to the process side
of the chemical seal.

Model 75..vd8 has an orifice d8 as instrument connection for
welding to a pressure gauge with process connection d8x5, e.g.
RCh 100 – 3vDW, cooling element or capillary line.
Leakage cannot occur at the welded connection of pressure
gauge / upper part and the filling port, which is not accessible from
the outside.
The parts can be easily cleaned externally.

Model 75..vG1⁄2 has a measuring instrument adapter with female
thread for direct mounting to measuring instruments with male thread.
The screwed connections pressure gauge / adapter and the filling
port must not be loosened or opened at any time, or else filling fluid
will leak and the measuring unit loses its efficiency.

NACE resp. Sour Gas Application
The material we use complies with the NACE MR 0175 standards
(NACE 0103 upon request). Only material with test certification is
used.

Chemical Seal
Stainless steel 1.4404 (316 L)

Instrument Connection
75..vd8 : for welding to measuring instrument, capillary line or
cooling element with welding connection (recommended
for media temperatures higher than 100 °C (212 °F))
75..vG 1⁄2 : G 1⁄2 female (1⁄2″ BSP)

Diaphragm
Sinus-shape, stainless steel 1.4435 (316 L)
He-leak detection up to 10-9 mbar l/s
Effective diaphragm diameter dM, see tables on page 3

Sealing Face
According to DIN EN 1092-1 Form B, sealing face B1,
flange stamped B, Raised Face (RF) for ASME B 16.5

Nominal Pressure
See tables on page 3

Minimum Span Pressure Gauges

See tables on page 3

Accessories

Capillary line, cooling elements: see data sheet 7002
Process connection pieces and sealings do not belong to the
standard supply programme, but are available upon request.

Construction / Filling / Certificates

Information on mounting, filling and certificates are available upon
request.

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Ordering Infomation Chemical Seals

Please note 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 instru-
ment and add the information for the respective chemical seal:

– Model: e.g. MDM 7511vd8, MDM 7521vG1⁄2
– Nominal case size: e.g. NPS 1″, DN 25
– Nominal pressure: e.g. Class 150, PN 10/40
if necessary, options: see page 2, e.g. wetted parts PTFE

The reference temperature is +20 °C (+68 °F). Please indicate,
if an operating temperature (tA) deviating from +20 °C (+68 °F)
max. is required (dial inscription tA…).

Example: Pressure gauge…,
Chemical seal: MDM 7511 vd8, DN 25, PN 10/40, tA +80°C

Ordering Information, Further Options

Dimensional Data (mm), Weight (kg), Minimum Span (bar) and t k -Value (mbar/10K)