Pressure sensors for food, beverage and dairy processes must meet strict hygienic design requirements — not just material standards. Certifications, surface finish, process connection type, seal material and CIP/SIP suitability all need to match the installation. Related pharmaceutical or biotech applications may have similar requirements, but the specific certification scope and hygienic design criteria must always be verified separately. This guide covers the key selection criteria and leads directly into the sensor selector.
Pressure sensors for food, beverage and dairy processes must meet stricter requirements than standard industrial transmitters. Related pharmaceutical or biotech applications may require similar hygienic or aseptic design criteria. The key certifications and standards are not interchangeable — a sensor that meets one may not meet another, and project specifications typically define which approvals are required.
European Hygienic Engineering & Design Group. Certification confirms the sensor design is cleanable and does not trap product. Widely required in European dairy, food and pharmaceutical processes.
North American hygienic standard for dairy and food equipment. 3-A SSI certification is widely specified in the US and Canada for CIP/SIP applications.
FDA compliance refers to materials intended for food contact. It does not by itself confirm hygienic sensor design or cleanability. USP Class VI applies to pharmaceutical elastomers. Verify both material compliance and hygienic design requirements separately.
NSF International certification for food equipment safety. Common in water treatment and food service. NSF 51 covers food equipment materials.
Standard G-thread or NPT connections are generally not suitable for product-contact hygienic processes, as they can trap product and are difficult to clean effectively. Hygienic process connections are designed for full drainability and CIP/SIP cleaning.
| Connection | Region / application | Notes |
|---|---|---|
| Tri-Clamp (ISO 2852) | Worldwide, dairy and biotech | Quick-release clamp connection. Most widely used hygienic fitting globally. |
| DIN 11851 | Europe, dairy and food | Threaded union connection. Common in European dairy and beverage installations. |
| DIN 11864 / SMS | Europe, food and beverage | Aseptic variants for sterile processes. DIN 11864-2 is the most common aseptic fitting. |
| Varivent (Alfa Laval) | Dairy and beverage, Europe | Proprietary fitting from Alfa Laval, widely used in dairy processes. |
| Flush NPT variants | Selected North American installations | May be used in non-critical or application-specific installations. Must be verified against the project's hygienic design requirements. |
| Criterion | What to check |
|---|---|
| Wetted materials | 316L stainless steel is the standard for food and dairy. Hastelloy C276 for aggressive CIP chemicals. Elastomers must be FDA-compliant — EPDM for hot water and steam, PTFE for chemical resistance, FKM for oils. Verify material certificates (EN 10204 3.1). |
| Surface finish | Ra ≤ 0.8 µm (32 µin) is a common requirement for food-contact surfaces. Some applications require Ra ≤ 0.4 µm. Verify the surface finish specification covers all wetted surfaces including the diaphragm. |
| Diaphragm type | Flush diaphragm is required for viscous, sticky or particulate media. Standard diaphragm with process connection recess is not acceptable for most hygienic applications. |
| CIP/SIP suitability | Clean-in-place (CIP) and sterilise-in-place (SIP) require the sensor to withstand repeated exposure to hot caustic (NaOH), acid (HNO₃) and steam. Verify temperature and chemical ratings against your specific CIP/SIP regime. |
| Temperature rating | SIP typically requires 135–150 °C steam sterilisation. Verify the sensor is rated for the sterilisation temperature including peaks. Some sensors require cooling before SIP. |
| IP rating | IP69K is commonly specified for high-pressure wash-down with hot water, depending on the cleaning regime. IP67/IP68 for general wet environments. Verify the IP rating covers the complete sensor including the cable entry. |
| Certifications | Specify which certifications are required — EHEDG, 3-A, FDA, NSF or a combination. Not all hygienic sensors carry all certifications. Verify the certificate is current and covers the specific variant. |
316L stainless steel is a material of construction, not a hygiene certification. The design of the sensor — surface finish, dead legs, drainability — determines whether it is truly hygienic. A 316L sensor with a standard G-thread connection is not suitable for food-contact applications.
EHEDG certification covers the sensor design, but the seal or O-ring material must also be separately verified for FDA compliance and chemical compatibility with the CIP chemicals used. EPDM, PTFE and FKM seals have different chemical resistance profiles.
CIP temperatures are typically 80–90 °C. SIP with steam is 135–150 °C. Not all CIP-rated sensors are SIP-rated. Verify the maximum temperature rating including steam sterilisation cycles.
A flush diaphragm alone does not guarantee a hygienic installation. The pipe run, mounting angle and connection type all affect drainability. EHEDG and 3-A guidelines define installation requirements beyond the sensor itself.
Verify before specifying: Always confirm the device configuration, wetted materials, seal material, surface finish, certifications and temperature rating against the manufacturer specifications and the relevant hygienic standard. Pressure Selector provides a shortlist for further evaluation — it does not replace engineering review or certification assessment.
For promising matches, use Request Info on any result to prepare a supplier inquiry based on your application requirements.
Pressure Selector converts application requirements — such as hygienic certification (EHEDG, 3-A, FDA, NSF), process connection type, wetted materials, surface finish, CIP/SIP suitability, pressure range and output signal — into a structured shortlist of matching pressure sensors.
The results link back to manufacturer specifications for verification. Coverage includes selected hygienic pressure transmitters and sensors from manufacturers such as Endress+Hauser, Baumer, Honeywell, BD Sensors, Wika, Ashcroft and others. Availability of EHEDG, 3-A, FDA, NSF certification and CIP/SIP suitability depends on the selected series and device configuration.