Hygienic Pressure Transmitter
Hygienic pressure transmitters are specialized instrumentation designed for sterile process environments, where accuracy, cleanliness, and compliance with 3-A, EHEDG, FDA standards are mandatory.
Baumer’s CleverLevel PFMN / PFMH are globally trusted for hygienic pressure measurement, especially in dairy, food, pharma, breweries, biotech, cosmetics, and clean-utility lines.
At NPK Industries, we supply, size, install, integrate and calibrate these transmitters for fully automated and compliant hygienic plants.
Why Hygienic Pressure Transmitters are Different
Unlike general industrial pressure transmitters, hygienic transmitters are engineered for:
✔ Zero dead-legs
✔ Crevice-free design
✔ Mirror-polished SS316L wetted parts
✔ Hygienic Tri-Clamp / DIN 11851 / Aseptic connections
✔ Full compatibility with CIP (Clean-in-Place) & SIP (Steam-in-Place) cycles
✔ High-temperature disinfection cycles (140°C steam)
✔ Resistance to aggressive cleaning chemicals (caustic / acid)
They ensure absolute product safety, avoid contamination, and maintain strict batch quality.
Technical Description of Baumer PFMN / PFMH
Mechanical Design
- Material: Wetted SS316L (Ra ≤ 0.8 μm polished)
- Process connections:
- Tri-Clamp, Varivent, DIN11864, Aseptic
- Flush-diaphragm hygienic design
- Pressure ranges:
- –1…0 bar to 0…40 bar
- IP Protection: IP67 / IP69K
- Housing: Stainless steel, laser-welded
Hygienic Approvals
- EHEDG certified
- 3-A Sanitary
- FDA-compliant diaphragm materials
- Resistant to CIP/SIP cycles
Electronics
- Output: 4–20 mA, IO-Link, switching output (PFMH)
- Fully digital signal processing
- Temperature-compensated from –20°C to +140°C
- High accuracy: ±0.15% FS
Display & Interface
- Rotatable LED/LC display (PFMH)
- 360° viewing angle
- Touch menu (tool-free setup)
Working Principle – How Hygienic Transmitters Work
Step-by-Step Working
- Process pressure presses against the flush stainless-steel diaphragm.
- A food-grade silicon oil (or dry-cell option) transfers pressure to the internal sensor chip.
- The piezoresistive sensing element detects diaphragm deformation.
- Signal conditioning electronics:
- Linearize
- Temperature compensate
- Convert to 4–20 mA / IO-Link output
- Final output is sent to PLC/SCADA/DCS.
Advantages of Hygienic Working Principle
✔ No dead space → bacteria cannot grow
✔ No O-rings inside media zone
✔ Fully flush → ideal for viscous & sticky products
✔ Accurate even during CIP/SIP thermal shock
✔ Fast response (dynamic batching & filling)
Applications Across Industries
Dairy Industry
- Milk pasteurizer pressure
- Cream & curd lines
- Yogurt processing
- UHT systems
- Milk reception tanks
- CIP return & detergent lines
Food & Beverage
- Syrups, sauces, viscous products
- Sugar dissolving tanks
- Carbonated beverage lines
- Brewery fermentation & conditioning
- Tomato paste / fruit pulp processing
Pharmaceutical / Biotech
- PW (Purified Water)
- WFI (Water for Injection)
- Clean steam
- Bioreactors / fermenters
- Filtration & chromatography skids
- Buffer prep systems
Cosmetics & Personal Care
- Creams, lotion batching
- Perfume blending tanks
- High-viscosity media
Baumer PFMN vs Baumer PFMH – Comparison Table
Feature | PFMN | PFMH |
Output type | Analog 4–20 mA | IO-Link + switching + analog |
Display | No | Yes (rotatable LED) |
Ambient temp | –20°C…+85°C | –20°C…+85°C |
Media temp | Up to 140°C SIP | Up to 140°C SIP |
Design | Basic Hygienic | Advanced Hygienic (Smart Sensor) |
Best for | Dairy, food, CIP lines | Pharma, biotech, automation |
Brand Comparison (Baumer vs WIKA / Endress / Anderson-Negele)
Feature | Baumer PFMH/PFMN | WIKA SA11 | Anderson-Negele L-Series | Endress Cerabar PMP55 |
Accuracy | ±0.15% | ±0.15% | ±0.2% | ±0.15% |
Display | Optional | Optional | LED | Backlit |
Output | IO-Link + analog | Analog | Analog | HART/Profibus |
Sensor Response | Very fast | Fast | Medium | High |
Hygienic Certification | EHEDG + 3-A | 3-A | 3-A + EHEDG | EHEDG |
Best Used In | Dairy/Pharma automation | Food, pharma | Dairy | Pharma & biotech |