PM425 Hygienic Pressure Transmitter – FDA & EHEDG Certified for Food & Pharma
Sanitary flush-diaphragm pressure sensor designed for sterile processes, food production, and pharmaceutical manufacturing.
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Certifications: 3-A, FDA-compliant, EHEDG-certified.
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Connection: Tri-Clamp (50.5mm / 64mm) for “dead-zone” free installation.
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Temperature: Supports CIP/SIP sterilization up to 200°C.
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Material: All-stainless steel AISI 316L construction.
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Best For: Dairy, breweries, biotech, and high-purity chemical lines.
Description
The PM425 Hygienic Pressure Transmitter is engineered specifically for industries where sanitation, purity, and process safety are non-negotiable. In pharmaceutical and food production, the smallest “dead zone” can become a breeding ground for bacteria. The PM425 solves this with a completely flush-mounted 316L stainless steel diaphragm. Unlike traditional threaded sensors that have internal cavities, the PM425 eliminates these stagnant areas, ensuring a 100% cleanable surface.
Engineered for CIP/SIP Sterilization
Maintaining a sterile environment requires aggressive cleaning cycles. The PM425 is fully compatible with:
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CIP (Clean-in-Place): Resistant to the caustic soda and nitric acid solutions commonly used in automated cleaning.
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SIP (Sterilization-in-Place): Capable of withstanding saturated steam temperatures up to 200°C without losing calibration or signal integrity.
Dual-Safety Protection: FDA-Approved Filling
Process safety is paramount. The internal transmission fluid in the PM425 is available as FDA-approved sanitary oil. This provides a critical safety layer: in the unlikely event of a mechanical diaphragm rupture, the filling fluid will not contaminate your batch, preserving the integrity of your milk, beverage, or pharmaceutical product.
Precision for Automated Swiss Manufacturing
Equipped with an advanced intelligent circuit, the PM425 series offers a precision of up to ±0.1% FS. This high-resolution data is essential for:
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Bioreactor Control: Maintaining precise pressure for cell culture stability.
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Milk Pasteurization: Monitoring pressure drops across heat exchangers.
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Brewing & Beverage: Controlling CO2 injection and tank head-pressure.
Features
Advanced Hygienic Design: Engineered without “dead spaces” or blind corners, ensuring no product residue can accumulate. The wetted surface is perfectly smooth and easy to sanitize.
International Compliance: Fully compliant with FDA, EHEDG, and 3-A standards. Every component is selected to guarantee maximum purity for the food, beverage, and biotechnology sectors.
CIP and SIP Resistance: Built to withstand aggressive chemical washes (Clean-in-Place) and saturated steam sterilization (Sterilization-in-Place) with temperatures up to 200°C.
316L Stainless Steel Flush Diaphragm: The high-quality stainless steel membrane is mounted flush to the process to prevent clogging—ideal for viscous, crystallizing, or particle-containing fluids.
Intelligent Electronics & Optional Display: Available with integrated LED or LCD displays (PM425C/E versions) for real-time data visualization directly in the field and easy zero/span calibration.
Industry 4.0 Integration: Wide range of output signals including 4-20mA, 0-10V, and digital communication via RS485 Modbus or HART, facilitating connection with INVT inverters, PLCs, and centralized control systems.
ATEX Safety (Optional): For hazardous environments such as distilleries or chemical plants, the PM425X version offers rigorous explosion-proof certifications.
High Environmental Protection: IP67/IP68 rating, ideal for environments with frequent high-pressure washdowns or extreme humidity.
Model Variants
To help you find the right solution for your process, the PM425 series is available in several specialized configurations:
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PM425 (Standard): The compact, essential base sensor designed for standard hygienic applications where space is limited but performance is critical.
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PM425C/E (Smart Display): Features an integrated LCD or LED display for real-time local pressure monitoring and field calibration without external tools.
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PM425X (Explosion-Proof): ATEX/IECEx certified for hazardous environments. Specifically engineered for spirits distillation, fine chemical processing, and explosive atmospheres.
Specification
| Feature | Technical Detail |
| Pressure Range | -0.1 MPa … 0 … 10 kPa … 100 MPa (Customizable) |
| Accuracy | ±0.25% FS (Typical); ±0.1% FS (High-precision option) |
| Diaphragm Material | AISI 316L Stainless Steel (Options: Gold-plated or Hastelloy) |
| Diaphragm Type | Flush-mounted, no dead zones |
| Filling Fluid | FDA-approved Sanitary Oil (or standard Silicone Oil) |
| Medium Temperature | -35°C to +200°C (SIP compatible) |
| Output Signals | 4-20mA (+HART), 0-10V, 0-5V, RS485 Modbus, I2C |
| Power Supply | 12 ~ 36 VDC (24 VDC Standard) |
| Response Time | Current: ≤ 2ms; Voltage: ≤ 10ms |
| Mechanical Resistance | Shock: 100g/1ms; Vibration: Max 20g (15~2000Hz) |
| Protection Class | IP65 / IP67 / IP68 (depending on electrical connection) |
| Certifications | CE, RoHS, 3-A, EHEDG, ATEX (PM425X Series) |
FAQ
1. Is the PM425 compatible with existing Tri-Clamp fittings? Yes. The PM425 is designed to industry-standard dimensions (e.g., DN25, DN40, DN50). It is fully compatible with standard Tri-Clamp (ISO 2852) and Varivent® connections commonly used in Swiss dairy and pharmaceutical plants.
2. Can I use the PM425 in a process that requires SIP sterilization? Absolutely. The PM425 is engineered to withstand Sterilization-in-Place (SIP) cycles with saturated steam up to 200°C. The high-grade 316L stainless steel and internal high-temperature filling fluid ensure the sensor remains accurate even after repeated thermal shocks.
3. What is the benefit of a “Flush Diaphragm” over a standard threaded sensor? Standard sensors have internal cavities (dead zones) where product can accumulate and bacteria can grow. A flush diaphragm sits perfectly even with the pipe or tank wall. This allows the cleaning fluid (CIP) to reach the entire surface, ensuring 100% hygiene and zero cross-contamination between batches.
4. Do you provide a 3.1 Material Certificate or FDA Declaration? Yes. Upon request, we can provide the necessary documentation, including 3-A/EHEDG compliance declarations and material traceability reports, which are essential for GMP-regulated facilities in Switzerland.
5. How do I configure the zero point and span on the version with the LCD display? The PM425C/E “Smart” versions feature an integrated button interface under the housing cover. This allows you to perform field calibration and zero-point adjustments without needing an external pressure generator or complex software.
