Food and beverage production is one of the most demanding environments for pressure instrumentation. Every sensor on the line has to deliver accurate, repeatable measurement and survive aggressive CIP and SIP cleaning cycles, avoid harbouring bacteria, and integrate cleanly into a hygienic process design. There’s no compromise between “measurement” and “hygiene”; both have to be right, every shift, every batch.
Stork Solutions supplies a dedicated range of hygienic pressure transmitters and gauges engineered specifically for the food, beverage and dairy sectors. This guide walks through where they’re used, what makes them hygienic, and how to specify the right instrument for your line.
What "Hygienic" Actually Means in a Pressure Transmitter
A hygienic pressure transmitter is defined less by its accuracy spec and more by its mechanical design:
- Flush-welded stainless steel diaphragm, with no crevices, no dead legs, and no ledges for product residue to build up on.
- Food-compatible materials throughout the wetted path (typically 316L stainless, ceramic diaphragms, FDA-approved fill oils).
- Hygienic process connections such as Tri-Clamp, Varivent, dairy pipe and DIN 11851 that seal cleanly and can be broken down for inspection.
- CIP/SIP compatibility, able to withstand hot caustic, acid and steam cycles, typically up to 150 °C (and higher with cooling elements).
- Certification including EHEDG, 3-A, FDA, and appropriate ingress ratings (IP67 / IP69) so the sensor survives high-pressure washdown.
Without these fundamentals, an “accurate” pressure transmitter is a liability on a production line.
Key Applications on a Food & Beverage Line
Hygienic pressure measurement shows up everywhere in a modern plant:
- Pasteurisation pressure and temperature control, maintaining the exact conditions that guarantee kill rates and product safety.
- Mixing vessel pressure monitoring, protecting tanks and ensuring consistent process conditions during blending.
- Bottling line pressure regulation, keeping fill pressures within tight tolerances to avoid foaming, underfill and rework.
- Filtration system pressure monitoring, monitoring differential pressure across filters to schedule cleaning and replacement.
- CIP / SIP cycle monitoring, verifying that cleaning circuits are performing as designed.
- Aseptic filling line instrumentation, where measurement stability and contamination prevention are both critical.
- Brewery tank pressure management, covering fermentation, conditioning and carbonation control.
Each application places slightly different demands on the transmitter, from raw accuracy to communication protocol to media temperature. Stork’s range is built to cover them.
The Stork Hygienic Range, Product by Product
DMP 331 P & DMP 331 P i: The Hygienic Workhorse
The DMP 331 P is one of the most widely specified hygienic pressure transmitters in food and beverage. Flush stainless steel diaphragm, CIP/SIP compatibility up to 150 °C, and an optional cooling element for media temperatures up to 300 °C.
For lines that need tighter accuracy and digital signal processing, the DMP 331 P i delivers temperature response of 0.04% FSO / 10K with a 1:10 turndown, making it a strong pick for pasteurisation, carbonation and filling.
Browse the wider pressure transmitters range for related industrial variants.
DCT 531 P, DCT 533 P & DCT 553 P: Smart, Connected Hygienic Measurement
Modern plants increasingly demand digital communication straight from the sensor:
- DCT 533 P and DCT 553 P offer IO-Link communication for fast commissioning, remote parameterisation and real-time diagnostics with no extra wiring.
- DCT 531 P provides Modbus RTU over RS485, with EHEDG certification and IP67 / IP69 ingress protection.
Together they cover the two dominant hygienic digital protocols and support the shift towards Industry 4.0 in food processing, giving maintenance and operations teams live visibility into instrument health and process performance.
Explore related products on the digital pressure sensors category page.
x|act ci & x|act i: Precision for Brewing, Dairy and Aseptic Lines
Where accuracy is critical, such as carbonation, fermentation and aseptic filling, the x|act ci precision pressure transmitter uses a capacitive ceramic sensor with a 99.9% Al₂O₃ diaphragm, giving outstanding media stability and high overpressure capability. It accepts a full range of hygienic process connections including Varivent, dairy pipe, and Tri-Clamp.
Where a safety-critical application requires SIL 2 compliance, the x|act i adds functional safety certification to IEC 61508 / IEC 61511, alongside HART communication and intrinsic safety (Ex ia) for hazardous area installations. This is useful for solvent-adjacent processes, ethanol handling, and certain distillery and brewery zones.
BAROLI 05 P: Hygienic Local Pressure Indication
Not every measurement point needs a transmitter wired back to the control system. For local pressure indication on vessels, pipelines and process skids, the BAROLI 05 P battery-powered digital pressure gauge is a practical hygienic solution. Flush-welded stainless steel diaphragm, FDA-approved food-compatible oil fill, rotatable housing, min/max function, and configurable pressure units, all designed for quick operator checks during production and maintenance without compromising hygiene standards.
Choosing the Right Instrument: A Quick Guide
Requirement | Recommended Product |
General hygienic pressure measurement, CIP/SIP up to 150 °C | DMP 331 P |
High accuracy hygienic measurement with digital processing | DMP 331 P i |
IO-Link connectivity for smart, connected lines | DCT 533 P / DCT 553 P |
Modbus RTU / RS485 with EHEDG and IP69 | DCT 531 P |
Precision measurement with ceramic diaphragm (brewing, dairy) | x|act ci |
SIL 2 functional safety with HART and Ex ia | x|act i |
Local pressure indication on hygienic lines | BAROLI 05 P |
Full range and datasheets available on the Hygienic Pressure Transmitters for Food & Beverage industry page.
Specifying with Confidence: Checklist
Before signing off a hygienic pressure transmitter, run through:
- Correct process connection (Tri-Clamp, Varivent, dairy pipe, DIN 11851)
- CIP/SIP temperature rating matches your cleaning cycle
- Ingress protection (IP67/IP69) suitable for washdown
- Certification such as EHEDG, 3-A, FDA on the wetted parts
- Communication protocol matches the control system (4–20 mA, HART, IO-Link, Modbus)
- Accuracy and turndown appropriate for the application (pasteurisation is unforgiving; storage is not)
- Hazardous area rating where required (ethanol, solvents)
- SIL rating where the loop is safety-critical
Final Thought
Hygienic pressure instrumentation isn’t a compromise between “good sensor” and “cleanable design”. It should be both, without exception. Stork’s food and beverage range is built around that principle: flush stainless diaphragms, hygienic connections, robust CIP/SIP tolerance, and a full spread from local gauges to SIL 2 precision transmitters and IO-Link smart sensors.
If you’re specifying instrumentation for a new line, a brewery expansion, a dairy retrofit or an aseptic filling upgrade, the team at Stork Solutions can help match the right hygienic pressure transmitter to the application, right down to the process connection and communication protocol.
