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Pressure Transmitters for Sanitary Applications


Sanitary Pressure Transmitters – Precision Measurement for Hygienic Applications

Choosing the right sanitary pressure transmitter is essential for maintaining product integrity and regulatory compliance in food, beverage, and pharmaceutical processing. Whether you're monitoring pasteurization, sterilization, or fermentation, these instruments deliver real-time, accurate data to help you prevent spoilage and optimize production.

Built from corrosion-resistant stainless steel with smooth, easy-to-clean surfaces, our sanitary pressure transmitters are designed to withstand repeated CIP/SIP cycles, high temperatures, and extreme pressures. Their high accuracy and repeatability ensure consistent batch quality, while compatibility with multiple process connections—including flush diaphragm and Tri-Clamp fittings—makes them adaptable to a wide range of hygienic pipelines and tanks.

Below, we compare key configuration options, including flush diaphragm designs, Tri-Clamp sanitary connections, and output signal types (4-20mA, HART, etc.), so you can find the ideal solution for your specific application needs.

What are the diffences between each sanitary process connection?
Choosing the right process connection is one of the most critical decisions when selecting a sanitary pressure transmitter. The wrong choice can lead to product entrapment,
cleaning failures, measurement drift, or even regulatory non-compliance. Below we compare the four most common sanitary connection types – Tri-Clamp, Flush Diaphragm,
Threaded, and Varivent – to help you match the right fitting to your specific application.

1.Tri-Clamp / Sanitary Ferrule Connection
Applications: Suitable for applications requiring frequent disassembly and cleaning or product line changes in dairy, beverage, and pharmaceutical pipelines.
Structural Features: Two identical chucks are clamped and sealed together using clamps and sanitary gaskets (EPDM, silicone, or PTFE).
Typical Applications:
Beer/Wine delivery pipelines
WF (Wastewater Inlet/Outlet) circulation systems
Bioreactor inlets/outlets
Advantages:
Quick assembly and disassembly, no special tools required
Standardized specifications (DN25/38/50/65/80/100, etc., corresponding to 1"~4")
No dead angles in the threads, thorough cleaning
Optional gasket materials to suit different temperature zones and media

2. Flush Diaphragm Connection – Diffused Silicon Core
Applications: Viscous media, liquids containing particles, easily crystallizing materials, and storage tanks/pipelines requiring pressure measurement without dead zones.
Structural Features: The diffused silicon core is encapsulated on a stainless steel base. The sensing diaphragm is flush with the process interface end face, without any recesses or gaps, allowing the medium to directly contact the diaphragm surface. The core is filled with silicone oil or olive oil to transmit pressure signals.
Typical Applications: Jam, honey, chocolate syrup, syrup pipelines
Yogurt, cream, whey protein liquid
Fermentation tanks containing suspended solids
Semi-solid pharmaceutical media such as ointments and creams
Wastewater/sludge pipelines containing fibers
Advantages: Completely flush surface, no dead corners for media residue, eliminating bacterial growth
Self-cleaning effect—material flow carries away deposits on the membrane surface
No pressure loss when measuring viscous media (will not clog pressure taps)
Mature diffused silicon technology, high accuracy (up to 0.1%FS), good long-term stability
Note: For media containing hard particulate impurities, membrane damage may occur.

3. Flush Diaphragm Connection – Ceramic Capacitor Core
Applications: Highly corrosive media, abrasive materials, and applications requiring higher voltage resistance and longer lifespan.
Structural Features: The ceramic capacitor core uses a high-purity alumina (Al₂O₃) ceramic diaphragm as the sensing element. The ceramic diaphragm and ceramic base form the capacitor plates. Dielectric pressure causes slight displacement of the diaphragm, changing the capacitance and thus outputting a signal. The ceramic diaphragm is mounted flush with the process end face.
Typical Applications:
Acidic/alkaline liquids (fruit juice, pickling solution, NaOH cleaning solution)
Abrasive slurries containing fine particles (starch slurry, carbonated beverage premix)
Buffer solutions and salt solutions in pharmaceuticals
Seawater desalination, high-salinity wastewater treatment
Demanding conditions with frequent SIP/CIP cycles
Advantages:
Ceramic material has extremely high corrosion resistance, suitable for almost all chemical media (except hydrofluoric acid)
Abrasion resistant, particle erosion does not affect accuracy
No filling fluid, no leakage risk, fully compliant with food/pharmaceutical safety requirements
Strong overload capacity (typically 3-5 times the rated range)
Excellent long-term stability, no filling fluid aging issues
Selection Notes:
Ceramic capacitor core costs more than diffused silicon, suitable for mid-to-high-end applications
Excessive installation torque may cause ceramic base cracking, it is recommended to operate according to the manufacturer's torque specifications
The lower limit of the range is limited by the stiffness of the ceramic diaphragm; for ultra-low pressure (≤1kPa), diffused silicon is generally recommended.

4.Concave Flat Diaphragm (Ceramic Piezoresistive Core) – High Cost-Performance and Economical
Suitable Scenarios: For routine sanitary pressure measurement applications where cost is sensitive, accuracy requirements are moderate, and the medium does not contain large particles or fibers.
Structural Features: Employs a ceramic piezoresistive core (thick-film resistor Wheatstone bridge). The diaphragm is slightly concave (not completely flush) with the process connection end face, forming a tiny groove. The ceramic material itself is corrosion-resistant, ensuring stable piezoresistive signal output. Due to its simple structure, its manufacturing cost is significantly lower than diffused silicon flat diaphragms and ceramic capacitor flat diaphragms.
Typical Applications:
* General beverage delivery pipelines (carbonated drinks, tea drinks, fruit juice)
* Purified water/deionized water circulation systems
* Whipping cream and skim milk pipelines in dairy products
* CIP supply pipelines (for pressure monitoring only, not critical control points)
* Tank level measurement in general food processing
* Embedded installation in OEM supporting equipment
Advantages:
* Extremely high cost-performance ratio – price significantly lower than diffused silicon flat diaphragm and ceramic capacitor flat diaphragm
* Corrosion-resistant ceramic piezoresistive core, no filling liquid, good food-grade safety
* Compact structure, low installation space requirements
* Accuracy meets conventional process requirements (0.5%FS ~ 0.3%FS)
* Selection Notes:
* Not completely flush; groove depth is typically 0.5~2mm, where trace amounts of medium may remain.
* Suitable for low viscosity, particle-free, and highly fluid liquids.
* Not suitable for high viscosity jams, fibrous slurries, or easily crystallizing materials.
* Limited accuracy, maximum 0.5%, cannot directly measure absolute pressure.
* Overload capacity is lower than ceramic capacitors.


5. DRD Flange (Dairy Rectangular Duct Flange)
Applications: Large-diameter dairy/beverage pipelines, rectangular or elliptical pipe cross-sections, and applications requiring lateral sensor insertion flush with the inner wall.
Structural Features: A DRD (Dairy Rectangular Duct) flange is a rectangular or elliptical sanitary flange connection, typically welded to the side of the pipe. The pressure transmitter is inserted from the flange end face, with the sensor diaphragm flush with the inner wall of the pipe. Commonly used in dairy receiving, separation, and standardization processes. Specifications are identified by DRD size numbers (e.g., DRD 25/38/51/63.5/76/101.6, where the number represents the pipe's outer diameter in mm).
Typical Applications: Raw milk receiving lines in dairy plants; inlet and outlet of milk fat separators; large-diameter piping in juice/beverage concentration systems; discharge pipes from saccharification/boiling kettles in breweries; side-wall installation in large storage tanks.
Advantages: The diaphragm is completely flush with the inner wall of the pipe, eliminating dead angles. Suitable for large-diameter pipes (DN50~DN100+), avoiding the problem that the advantages of chucks are not obvious in large-diameter pipes. The flange connection is robust and reliable, with strong vibration resistance. The sensor can be disassembled externally for easy maintenance.
Selection Notes: DRD flange specifications are not a globally unified standard; DRD dimensions may vary slightly between different equipment manufacturers (GEA, Alfa Laval, SPX). The specific model must be confirmed during selection. Installation requires welding of the flange seat, which places requirements on the welding process (the weld seam must be polished to Ra≤0.8μm). Flange gaskets must be selected separately to ensure compatibility with the medium.
High cost.

Product Advantages

We are an enterprise dedicated to providing reliable transmitter solutions for sanitary fields.

Model: HPM711 Basic Information

High overall accuracy and various hygienic interface designs are best suited for all common applications in the food industry.


Features:

Flush diaphragm structure

Hygienic pressure interface

Various electrical interfaces

Various process connections

Pressure measurement in industrial process control

Application Fields：

Food and beverage industry

Pharmaceutical industry

Level measurement

Technical:

Measuring range: -100kPa…0～10kPa…60MPa(G)， 0～25kPa…10MPa(A)

Output signal: 4～20mADC; 0～10VDC ; 0～5VDC;HART;RS485

Process connection: G1, G1/2

Applications

Sanitary pressure transmitters are widely used in the food and beverage industry to ensure precise pressure monitoring, maintain product quality,

and comply with stringent safety standards.

Food&Beverage Industry

Sanitary pressure transmitters are essential in the Food and Beverage industry, ensuring accurate monitoring of pressure in processes like brewing, bottling, and packaging. Their hygienic design prevents contamination, complying with safety standards. By providing real-time data, they enhance efficiency and quality control, crucial for maintaining product integrity.

Biopharmaceutical Industry

Sanitary pressure transmitters play a vital role in the Biopharmaceutical industry by ensuring precise pressure measurements during critical processes like fermentation and filtration. Their sterile design prevents contamination, adhering to regulatory standards. These transmitters enable real-time monitoring, enhancing process control and product quality, which are essential for safe and effective biopharmaceutical production.

Pulp and Paper Mill

Sanitary pressure transmitters are crucial in Pulp and Paper Mills, where they monitor pressure during processes like pulping, bleaching, and drying. Their robust design ensures reliability in harsh environments, preventing contamination. By providing accurate data, these transmitters enhance process efficiency and product quality, essential for sustainable paper production.

Product Center

Welcome to Highjoin! We are an enterprise dedicated to providing pressure solutions for different automation process.

We understand that the reliability and stability pressure transmitters are essential for maintaining the operation of equipment in industrial use. 

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Looking for reliable Pressure Transmitters for Sanitary Applications? HJSensor is your trusted partner! Our high-precision pressure transmitters are designed to meet the strict hygiene standards of industries like food and beverage, pharmaceuticals, and biotechnology. Whether you need technical specifications, pricing, or a custom solution, our expert team is here to support you.

Mob：+86-17551075580

E-mail：info@hjsensor.com

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