- Double-diaphragm system to ensure the separation of the process and the pressure measuring instrument
- Process connection with flange to provide for direct threaded connection
- All welded design with flush diaphragm
- Wetted parts from Hastelloy
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- Process connection with thread for direct threaded connection
- Version with internal diaphragm
- Diaphragm seal parts screwed together
- Universal application
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- Process connection with thread for direct threaded connection
- Version with internal diaphragm
- Diaphragm seal parts screwed together
- Universal application
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- Quick cleaning, without residue
- Milk thread fitting per DIN 11851
- Suitable for cleaning out of place (COP)
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- Quick cleaning, without residue
- Milk thread fitting per DIN 11851
- Suitable for cleaning out of place (COP)
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- Quick cleaning, without residue
- Process connection per Svensk Standard SS 1145
- Suitable for cleaning out of place (COP)
- Sterilisation-in-Place (SIP) up to max. 130 °C [266 °F]
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- Quick cleaning, without residue
- Process connection per Svensk Standard SS 1145
- Suitable for cleaning out of place (COP)
- Sterilisation-in-Place (SIP) up to max. 130 °C [266 °F]
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- Quick cleaning, without residue
- Clamp connection easy to open for cleaning and seal replacement
- Suitable for SIP and CIP
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- Quick cleaning, without residue
- Clamp connection easy to open for cleaning and seal replacement
- Suitable for SIP and CIP
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- Open flange with internal, all welded diaphragm with diaphragm bed
- No sealings and clamping elements
- Compact design
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- Open flange with internal, all welded diaphragm
- No sealings and clamping elements
- Robust, all welded design
- Compact design
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- Flange with a flush welded diaphragm
- Robust, all welded design
- Universal application
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- Flange with a flush welded diaphragm
- Robust, all welded design
- Universal application
| Datasheet |
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- Process connection with thread to provide for direct threaded connection
- Version with internal diaphragm
- Diaphragm seal parts all welded
- Universal application
| Datasheet |
| User Manual |
- Process connection with thread to provide for direct threaded connection
- Version with internal diaphragm
- Diaphragm seal parts all welded
- Universal application
| Datasheet |
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- Double-diaphragm system to ensure the separation of the process and the pressure measuring instrument
- Process connection with thread to provide for direct threaded connection
- All welded version with internal diaphragm
- System from Monel
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Quick coupling Flush diaphragm at the front Foodstuff compatible filling liquids Special material for extreme service requirements
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Compact dimensions Flush diaphragm at the front Special materials for extreme service requirements
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- Compact size
- Oval capsule sensor with internal support for stabilization
- Immersed directly in the medium
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- Process connection with thread
- Version with internal diaphragm, diaphragm seal parts screwed together
- Large selection of process connections and materials
- Flushing connections optionally available
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- Flange with internal welded diaphragm
- Mounting to measuring instruments for low pressures, also for differential pressure
- Flushing connections optionally available
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- Flush diaphragm
- Process connection to provide for direct threaded connection with block flange or saddle flange
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- High pressures up to PN 400 / class 2.500
- Flange with internal welded diaphragm
- Small process connections
- Flushing connections optionally available
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- Flush, aseptic process connection
- Dead-space free installation
- Suitable for SIP and CIP
- 3-A compliant
- Rotatable retainer flange
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- Quick mounting and dismounting
- Quick cleaning of measuring point, without residue
- Suitable for cleaning out of place (COP)
- 3-A compliant
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- Quick cleaning, without residue
- Clamp connection easy to open for cleaning and seal replacement
- Suitable for SIP and CIP
- EHEDG certified and 3-A compliant
- Compliant per ASME BPE
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- Quick cleaning, without residue
- Suitable for SIP and CIP
- EHEDG certified and 3-A compliant
- For installation into VARINLINE® access units
- 100 % material traceability for wetted parts
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- Flange with flush welded diaphragm
- Common standards and nominal widths available
- Wide variety of different materials and material combinations
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- Compact cell-type
- Intermediate flange with flush diaphragm
- Common standards and nominal widths available
- Wide variety of different materials and material combinations
- Instrument connection via radial gauge adapter
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- Flange with extended welded diaphragm
- Common standards and nominal widths available
- When special materials are selected, all wetted parts are made of the selected material
- Robust, all welded design
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- Process connection with flush, all welded diaphragm, with or without retainer flange
- For highest dynamic pressures ≤ 2,500 bar
- System fill fluids FDA and USP conform
- Robust, all welded design
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- Process connection with thread
- Version with internal diaphragm, diaphragm seal parts fully welded
- Large selection of process connections and materials
- Flushing connections optionally available
- High pressures up to 1,000 bar [14,500 psi] can be achieved
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- Intermediate flange (diaphragm seal cell) with extended diaphragm
- Versions for all common standards and nominal widths available
- When special materials are selected, all wetted parts are made of the selected material
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- Threaded connection for screwing in directly
- Flush diaphragm with compact dimensions
- High pressures for the process industry
- Version with protective plate for increased wear resistance
- Vacuum measuring ranges
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- Process connection with thread
- Version with internal diaphragm, large working volume, diaphragm seal parts screwed together
- Large selection of process connections and materials
- Flushing connections optionally available
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- Flange with internal welded diaphragm
- Wide temperature application range due to large working volume
- When special materials are selected, all wetted parts are made of the selected material
- Integrated flushing connections (optional)
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- Threaded diaphragm seal with extended welded diaphragm
- Special steel alloy for urea synthesis
- Dimensions following Snamprogetti® standard 1)
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- Quick cleaning of measuring point, without residue
- Certified hygienic design
- Suitable for SIP and CIP
- EHEDG certified and 3-A compliant
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- Quick cleaning of measuring point, without residue
- Certified hygienic design
- Suitable for SIP and CIP
- EHEDG certified and 3-A compliant
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- Dead space free
- Hygienic design
- Materials and surface finish qualities in accordance with pharmaceutical industry directives and standards
- 3-A compliant
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The successful design and the excellent functionality of the WIKA switch family were already confirmed by winning the "iF product design award 2009"
- Easily-readable, robust display
- Intuitive and fast setup
- Easy and flexible mounting configurations
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Diaphragm Seal Assemblies – Flush, Threaded & Flanged Solutions
Diaphragm seal assemblies (chemical seals) protect gauges, transmitters, and switches from hot, viscous, crystallizing, or corrosive media. A flexible diaphragm and suitable fill fluid transmit process pressure traceably to the measuring instrument—hygienic, low-dead-space, and easy to clean.
We offer flush designs (e.g., Tri-Clamp/Varivent®), threaded diaphragm seals (G/NPT), and flanged seals to DIN/ASME—optionally as remote systems with capillaries and cooling elements. ICS Schneider Messtechnik supports selection of diaphragm material, fill fluid, process connection, and temperature management—including factory or DAkkS calibration.
FAQ on Diaphragm Seal Assemblies
Key guidance on designs, media compatibility, fill fluids, temperature, hygiene, installation, and calibration.
When is a diaphragm seal required?
For high temperatures, pasty/particle-laden media, crystallization tendency, strong corrosion, or hygienic requirements (CIP/SIP)—to protect the instrument and keep the measuring point stable.
What designs exist?
| Design | Typical connections | Application |
|---|---|---|
| Flush (front-flush) | Tri-Clamp, Varivent®, DIN/ASME flange | Hygiene, viscous/particle-laden media |
| Threaded | G 1/2, G 1, 1/2" NPT, 1" NPT | General process industry |
| Flanged | DIN/EN/ASME | High pressure, aggressive media, standardization |
| Remote mount | Capillary line | Thermal/vibration decoupling |
Which diaphragm material should I choose?
316L for many media; Hastelloy®, Monel®, Tantalum, or PTFE lining for highly corrosive media. Selection depends on medium, temperature, pH, chloride content, and cleaning method.
Which fill fluid is appropriate?
| Fill fluid | Typical temp. range | Comment |
|---|---|---|
| Silicone oil | -40…+200 °C | Universal, low viscosity |
| Synthetic oil | -20…+250 °C | Higher thermal stability |
| Food/medical oil | -10…+200 °C | NSF/H1, FDA compliant |
| High-temperature fluid | up to +400 °C* | *design-dependent |
| Glycerin/water | 0…+150 °C | Hygienic, limited upper temp. |
Do diaphragm seals affect measurement dynamics?
Slightly—due to added volume and fill-fluid viscosity. Low-volume systems, short capillaries, and suitable fluids minimize lag and temperature effects.
What temperature measures are useful?
Cooling elements, capillaries, or remote mounting lower instrument temperature. Install away from heat sources and shield from radiant heat.
How hygienic is the measuring point?
Flush/inline diaphragms are low-dead-space and CIP/SIP-capable. Choose seals (EPDM/FFKM/PTFE) and surface finish per hygiene standards (e.g., EHEDG-compliant concepts).
Which process connections are common?
- Tri-Clamp/Varivent® – food/pharma
- DIN/ASME flanges – chemical/general
- G/NPT threads – standard applications
Can I retrofit existing gauges/transmitters?
Yes. Instruments can be combined via adapters or direct mounts. Afterwards, verify calibration/scaling of the complete system.
How are systems with diaphragm seals calibrated?
Always as a complete assembly (seal + instrument), since transfer characteristics are system-dependent. Distribute test points across the working range.
What should I consider for capillary length?
Keep as short as possible and route with mechanical protection. Long capillaries increase fill volume → slower response and stronger temperature influence.
What are common sources of error?
- Incorrect fill fluid → sluggish transfer/temperature errors
- Unsuitable materials → corrosion/leaks
- Overlong capillaries → lag/drift
How do I document the measuring point properly?
Record device ID, diaphragm material, fill fluid, connection, capillary length, temperature limits, and calibration status (certificate no./date).
Do you offer sizing/material consulting?
Yes. We analyze medium/process, recommend design/material/fluid, size capillaries/cooling elements, and supply calibrated complete assemblies.