The WIKA S-11 is a pressure transmitter with a flush diaphragm process connection. Unlike conventional pressure transmitters with a recessed pressure port, its diaphragm sits flush with the process connection, helping prevent clogging when measuring difficult media.

Key Features

• Flush diaphragm: Suitable for viscous, sticky, crystallising and particle-containing media.
• Stainless steel construction: Fully welded process connection designed to isolate the medium from the measuring instrument.
• Multiple output options: 4–20 mA, 0–20 mA, 0–10 V or 0–5 V, depending on configuration.
• Accuracy: Standard accuracy of 0.5% of span, with a 0.25% option.
• High-temperature option: Integrated cooling element available for media temperatures up to 150°C.
• Hygienic option: Internal fill fluid compliant with FDA 21 CFR 178.3750 available for selected food and beverage applications.
• Vacuum-tight design: Suitable for compatible vacuum and compound-pressure applications.

Suitable Applications

• Food and beverage production: Pressure measurement in product lines where cleanability is important.
• Filling and packaging machinery: Monitoring pressure in filling systems handling sticky or viscous products.
• Dosing systems: Measuring pressure in systems that handle pastes or particle-containing materials.
• Chemical processing: Monitoring compatible media that may crystallise or cause buildup.
• Level measurement: Pressure-based level monitoring where the selected range and installation are suitable.

Technical Highlights & Selection Considerations

Before ordering, confirm the measuring range, process connection, output signal and medium temperature.

• Process connection: Choose the correct thread size and flush diaphragm design.
• Wetted materials and seals: Check chemical compatibility with the process medium.
• Output signal: Match the transmitter output to the PLC or control system.
• Temperature: Standard versions and cooling-element versions have different permissible medium temperatures.
• Accuracy: Select standard 0.5% or optional 0.25% accuracy according to measurement requirements.
• Hygienic requirements: Confirm the required fill fluid, process connection and applicable approvals rather than assuming every S-11 configuration is hygienic-certified.

Available measuring ranges and overload limits depend on the selected configuration. Check the exact datasheet before replacing an existing instrument.

FAQ

Q1: What is the main advantage of the S-11 over a standard pressure transmitter?

Its flush diaphragm reduces the risk of clogging when measuring viscous, sticky or particle-containing media.

Q2: Can the S-11 measure high-temperature media?

Yes. A version with an integrated cooling element is available for media temperatures up to 150°C.

Q3: Which output signals are available?

Depending on the configuration, outputs include 4–20 mA, 0–20 mA, 0–10 V and 0–5 V.

Q4: Is the S-11 suitable for food and beverage applications?

Yes, selected configurations offer fill fluid compliant with FDA 21 CFR 178.3750. Confirm the specific hygienic requirements and process connection for your application.

Q5: What information is needed for a quotation?

Provide the full model or part number, measuring range, process connection, output signal, medium and operating temperature, and any required hygienic specifications.