Introduction
In food manufacturing, viscosity is one of the most critical quality parameters — it determines product texture, mouthfeel, spreadability, pourability, and the consumer perception of product quality. Food manufacturers invest heavily in achieving consistent viscosity because consumers notice viscosity variations immediately: a sauce that pours differently, a chocolate that does not coat evenly, a honey that crystallizes or flows too slowly.
Inline food viscosity measurement enables real-time process monitoring and control that laboratory sampling simply cannot match. With laboratory testing (rotational viscometer, Bostwick consistometer, flow cup), there is a time lag of 15-60 minutes between sampling and result — during which an entire batch may be produced outside specification. Inline viscosity measurement closes this feedback loop, enabling immediate detection and correction of viscosity deviations.
This guide covers the complete landscape of industrial food viscosity measurement — the specific rheological characteristics of food products, the regulatory and sanitary requirements that govern food processing instrumentation, the technology options for inline food viscosity measurement, and the practical implementation guidelines for food processing environments.
Food Rheology: Why Food Viscosity Measurement Controls Food Quality
Food viscosity is not a simple physical property — it is a direct driver of consumer perception and processing behavior. Understanding the relationship between viscosity and food quality is essential for setting meaningful viscosity specifications and interpreting inline food viscosity measurement data correctly.
Texture and Mouthfeel
In sensory science, viscosity is the primary measurable correlate of texture perception. Thick, creamy textures (yogurt, custard, cream cheese) are associated with high viscosity; thin, refreshing textures (milk, fruit juice, clear soup) with low viscosity. The relationship between objective viscosity measurement and subjective texture perception is remarkably consistent across consumer populations — making viscosity a reliable proxy for texture quality.
For yogurt, the ideal viscosity depends on the product style: set-style yogurt should have a firm, gel-like texture (viscosity 1,000-3,000 cP at 10 s⁻¹ shear rate); stirred yogurt should be thick but pourable (300-800 cP at 100 s⁻¹). Inline food viscosity measurement enables continuous monitoring of yogurt texture during fermentation (where viscosity builds as the yogurt sets) and through the cooling and filling process.
For cream cheese and processed cheese, viscosity determines spreadability and the perception of richness. The viscosity target is highly specific to the brand and consumer demographic — a European-style cream cheese (firmer, lower moisture) has different viscosity targets than an American-style cream cheese (softer, higher moisture). Inline food viscosity measurement allows the manufacturer to produce a consistent texture across production batches despite variations in raw material composition.
For honey, viscosity determines pourability and spreadability. Raw honey viscosity ranges from approximately 2,000-10,000 cP at 25°C depending on moisture content and floral source. The viscosity of honey is highly temperature-dependent — approximately 5-7% per °C near room temperature. This extreme temperature sensitivity makes automatic temperature compensation essential for honey viscosity measurement and creates the classic “runny when warm, thick when cold” behavior that consumers recognize.
Processing Behavior
Food viscosity affects processing efficiency and equipment performance:
Mixing and blending: High-viscosity fluids require more energy to mix. Viscosity determines the power draw of agitators, the mixing time required for homogeneous blending, and the design of mixing equipment. Inline food viscosity measurement enables proactive adjustment of mixing parameters as viscosity changes.
Pumping and piping: Food products must be pumped through pipes from process to process. Viscosity determines the pressure drop in pipes, the sizing of pumps, and the risk of product stratification or settling in pipes. For high-viscosity products (yogurt, tomato paste, chocolate), the pipe diameter and pump type must be selected for the specific viscosity range.
Heat transfer: During pasteurization and sterilization, viscosity affects the heat transfer coefficient and the processing time required to achieve the target temperature. Higher viscosity reduces the heat transfer coefficient, requiring longer holding times. Inline food viscosity measurement enables real-time adjustment of pasteurization parameters to account for viscosity variations between batches.
Filling and packaging: The filling speed and packaging format depend on viscosity. Low-viscosity products (milk, juice, sauces) fill quickly through small orifices; high-viscosity products (honey, peanut butter, chocolate) require larger orifices and slower filling speeds. Inline food viscosity measurement enables optimization of filling parameters for each batch.
Food Safety and Sanitary Standards for Food Viscosity Measurement
Food processing instrumentation must meet specific sanitary and food safety standards. The key standards governing inline food viscosity measurement instruments are:
3-A Sanitary Standards
3-A Sanitary Standards are developed by 3-A Sanitary Standards, Inc. (USA) and define the hygienic design requirements for equipment and components used in dairy, food, and beverage processing. The relevant standard for inline instrumentation is 3-A Sanitary Standard 78-03 (General Requirements for Sanitary Instruments).
A viscometer carrying 3-A certification has been evaluated for:
- Material food safety: All wetted materials are FDA-approved food contact materials (typically 316L stainless steel for the sensor body)
- Cleanability: The instrument design allows effective cleaning in place (CIP) without disassembly
- Drainability: The instrument can be fully drained — no pockets where product can accumulate and harbor bacteria
- Surface finish: Wetted surfaces have Ra ≤ 0.8 µm (32 µin) to prevent bacterial attachment
- Seal design: All seals are designed to prevent product infiltration and bacterial growth
The LONNMETER LONN-ND80 tuning fork viscometer is available with 3-A sanitary certification option for food processing applications. The 3-A certified version includes a Ra ≤ 0.8 µm wetted surface finish, FDA-compliant seal materials (EPDM or PTFE), and a CIP-optimized process connection design.
FDA Food Contact Materials
All wetted materials in food processing instrumentation must be listed in the FDA’s Generally Recognized as Safe (GRAS) inventory or otherwise approved as food contact materials. The LONN-ND80 food-grade version uses:
- Wetted sensor body: 316L stainless steel (ASTM A276, Ra ≤ 0.8 µm) — approved for food contact
- Fork tines: 316L stainless steel — approved for food contact
- Process connection seal: EPDM (FDA 21 CFR 177.2600) or PTFE (FDA 21 CFR 177.1550) — food-grade elastomers
- Fork coating: Optional PFA coating for highly corrosive food products (acidic foods, salty foods)
EHEDG Guidelines
The European Hygienic Engineering & Design Group (EHEDG) publishes guidelines for hygienic equipment design that complement 3-A standards. The EHEDG guidelines emphasize cleanability as the primary determinant of hygienic design. For inline food viscosity measurement, the EHEDG Design Principles for Hygienic Equipment (Document 8) provides the design framework for instrument selection.
Technology for Inline Food Viscosity Measurement
Vibrational Viscometers for Food Applications
Tuning fork viscometers (LONN-ND80) are increasingly used for inline food viscosity measurement because they address the specific requirements of food processing:
- No rotating seal: Food products — particularly those with particulate (fruit pieces, chocolate chips, nuts) — are aggressive to rotating shaft seals. The tuning fork design has no rotating parts and no shaft seal.
- CIP compatibility: The smooth, flush surface of the tuning fork sensor is fully compatible with CIP cleaning cycles (caustic wash, acid rinse, water rinse). The sensor does not require disassembly for cleaning.
- Sanitary process connections: Tri-clamp and DIN 11851 SMS process connections are available for sanitary food processing installations.
- Compact size: The compact tuning fork sensor fits into small-diameter pipes (DN15-DN50) common in food processing without creating dead legs or product accumulation zones.
Rotational Viscometers
Rotational viscometers (spindle-type, Couette-type) are used for laboratory food viscosity testing and for some inline applications. They offer the advantage of direct shear rate control — the rotation speed can be set to specific shear rates, enabling rheological characterization of non-Newtonian food products.
For inline food viscosity measurement, rotational viscometers have significant drawbacks:
- Shaft seal vulnerability: The rotating shaft must pass through the process wall, creating a seal that is vulnerable to food product infiltration and bacterial growth
- Particulate damage: Food products containing particulates (fruit pieces, seeds, nuts) can damage the rotating spindle
- Large size: Rotational viscometers require larger process connections and more installation space than tuning fork sensors
- Slow response: The thermal mass of the rotating spindle limits response time to 30-120 seconds
Application-Specific Food Viscosity Measurement Strategies
Honey Viscosity and Crystallization Control
Honey is one of the most challenging food products for viscosity measurement. Its viscosity varies over a wider range with temperature than almost any other food product — approximately 5-7% per °C near room temperature (20-30°C). At 25°C, honey viscosity ranges from 2,000-10,000 cP depending on moisture content. At 40°C, viscosity drops to 200-1,000 cP — a 10× reduction from just 15°C warming.
Why honey viscosity measurement matters: The honey industry monitors viscosity for two purposes — processing optimization and crystallization prediction. During honey processing (filtering, pasteurization, blending), viscosity determines pumping and filtering efficiency. During storage, honey viscosity increase is the first sign of crystallization onset.
The LONN-ND80 tuning fork viscometer is installed in the honey processing line (after pasteurization and before filling). The viscometer provides a continuous viscosity reading that enables:
- Optimization of honey pumping parameters based on current viscosity
- Detection of crystallization onset (viscosity spike) before the crystals become visible
- Quality verification of blended honey (mixing different floral sources) by viscosity comparison
The key requirement for honey food viscosity measurement is accurate temperature compensation. The honey-specific ATC curve in the LONN-ND80 accounts for the 5-7% per °C temperature sensitivity, enabling accurate viscosity reporting at a reference temperature (typically 20°C or 25°C).
Chocolate Viscosity Measurement
Chocolate manufacturing requires precise viscosity control for two key parameters: yield value (the force required to initiate flow) and plastic viscosity (the resistance to flow once flowing). These parameters are measured using rotational rheometry, but inline viscosity measurement provides a continuous process control signal.
The typical viscosity range for chocolate is 1,000-30,000 cP at 40-50°C, depending on the fat content and cocoa butter percentage. Dark chocolate (lower fat) has higher viscosity; milk chocolate (higher fat) has lower viscosity. White chocolate has the lowest viscosity of all.
The LONN-DN60 high-viscosity inline viscometer is installed in the chocolate conching and tempering lines. The instrument’s maximum process temperature of 300°C covers the chocolate processing temperature range (temperatures of 40-50°C for most chocolate, up to 120°C for some coating applications).
Chocolate food viscosity measurement challenges:
- Fat bloom: Chocolate fat can migrate to the surface during storage, creating a white discoloration. The viscosity measurement does not directly detect fat bloom, but changes in viscosity after tempering can indicate temper instability.
- Chocolate particle size: The particle size of cocoa and sugar in chocolate affects viscosity. Very fine grinding (below 20 µm) reduces viscosity; coarse grinding increases viscosity. The viscometer reading provides an aggregate signal that includes particle size effects.
- Temperature control: Chocolate viscosity is highly temperature-dependent — approximately 4-6% per °C in the typical processing range (35-50°C). Accurate temperature compensation (PT1000 sensor, ±0.1°C accuracy) is essential.
Dairy: Yogurt, Milk, and Cream
Milk and cream: The viscosity of raw milk (3-4 cP at 20°C) is slightly higher than water due to protein and fat content. Pasteurized milk viscosity is similar to raw milk unless fat standardization has been applied. Cream viscosity varies with fat content: half-and-half (10-12% fat) has 5-15 cP; light cream (18-30% fat) has 15-100 cP; heavy whipping cream (36% fat) has 100-1,000 cP.
For dairy processing, the LONN-ND80 covers the cream viscosity range easily (0.5-5,000 cP). The 316L stainless steel wetted materials are compatible with all dairy products.
Yogurt: Yogurt viscosity builds during fermentation as milk proteins (casein) coagulate and form a gel network. Inline yogurt food viscosity measurement enables real-time monitoring of fermentation progress and quality control.
Yogurt has shear-thinning (pseudoplastic) behavior — its viscosity decreases as shear rate increases. At low shear (1 s⁻¹), set yogurt viscosity can be 1,000-10,000 cP. At typical pumping shear rates (100 s⁻¹), the viscosity drops to 100-1,000 cP. The LONN-ND80 tuning fork viscometer measures at approximately 200-400 s⁻¹, providing a consistent shear rate reference that correlates well with pumping and filling behavior.
Sauces, Dressings, and Condiments
Tomato-based sauces (ketchup, salsa, tomato paste): Viscosity ranges from 200-5,000 cP depending on concentration and tomato solids content. Tomato products are mildly acidic (pH 3.5-4.5) and contain abrasive particulate matter (tomato skin, seeds). The 316L stainless steel LONN-ND80 is suitable for most tomato sauce applications.
Mayonnaise and salad dressings: These are oil-in-water emulsions with complex rheological behavior — they are typically shear-thinning and may exhibit yield stress (they behave as solids below a critical stress and flow above it). Viscosity ranges from 500-5,000 cP at application shear rates. The LONN-ND80 provides consistent viscosity readings that correlate with product texture and spreadability.
BBQ sauce and thick condiments: High-viscosity products (2,000-10,000 cP) that require careful installation to ensure the sensor remains fully immersed. The LONN-ND80 is suitable for these products up to 5,000 cP; above this range, the LONN-DN60 would be required.
Temperature Compensation for Food Viscosity Measurement
Temperature compensation is particularly critical for food viscosity measurement because food products have high temperature-viscosity coefficients and are often processed at variable temperatures.
Typical temperature-viscosity coefficients for food products:
| Food Product | Temp-Visc Coefficient | Process Temperature Range | Notes |
|---|---|---|---|
| Honey | 5-7% per °C | 20-50°C | Extremely temperature sensitive |
| Chocolate | 4-6% per °C | 35-55°C | Fat content affects sensitivity |
| Milk | 2-3% per °C | 4-80°C | Temperature affects protein conformation |
| Cream (30% fat) | 3-4% per °C | 4-40°C | Fat crystallization at low temperatures |
| Yogurt | 3-5% per °C | 4-30°C | Gel network sensitivity |
| Tomato sauce | 3-5% per °C | 20-90°C | Depends on solids content |
| Sugar solutions | 2-3% per °C | 20-80°C | Concentration-dependent |
| Vegetable oil | 3-4% per °C | 20-150°C | Viscosity decreases with temperature |
The LONN-ND80 applies food-specific temperature compensation using PT1000 temperature measurement (±0.1°C accuracy) and configurable temperature-viscosity curves for each food product. LONNMETER application engineering can assist in establishing the correct ATC curve for your specific food product.
Installation Guidelines for Food Processing
Food Viscosity Measurement: Installation Best Practices and Mounting Guidelines
For sanitary food processing environments, the following installation best practices apply: mounting the viscometer in a vertical pipe section with the fork tines pointing downward ensures complete drainage and prevents product accumulation. The installation location should provide a minimum straight run of 10 pipe diameters upstream of the sensor to ensure fully developed flow profile. The instrument housing must be grounded properly to prevent electrical interference from variable frequency drives (VFDs) common in food processing lines.
Sanitary Installation Principles
For food processing environments, the following installation principles apply:
- Sanitary process connection: Use tri-clamp (standard in North America) or DIN 11851 SMS/Nourney connection (standard in Europe) for food-grade process connections. All connections must be self-draining — no dead legs or pockets where product can accumulate.
- Orientation: Install the viscometer in a vertical pipe section with the fork tines pointing downward. This ensures complete drainage during CIP cycles and prevents air or foam accumulation on the fork.
- CIP compatibility: Verify that the CIP cleaning solution (caustic wash at pH 12-13, acid rinse at pH 1-2, sanitizing solution) is compatible with the viscometer wetted materials and seals. Most LONN-ND80 food-grade seals (EPDM, PTFE) are compatible with standard CIP chemicals.
- Thermal expansion: Food processing lines are subjected to steam sterilization (SIP – Sanitize In Place) at temperatures up to 130°C. Verify that the instrument process connection rating exceeds the maximum SIP temperature and that the thermal expansion during SIP does not damage the sensor.
3-A Certified Installation
For 3-A certified installations, the following additional requirements apply:
- The instrument must be installed at a location where it can be completely drained
- The process connection seal material must be FDA-compliant
- The wetted surface finish must be Ra ≤ 0.8 µm
- The instrument must be removable for inspection without disassembling the process line
Food Viscosity Measurement: Comprehensive Comparison Data
Viscosity Ranges by Food Product and Application
| Food Product | Process Application | Viscosity Range | Temperature | Shear Rate | Target Tolerance |
|---|---|---|---|---|---|
| Raw milk | Pasteurization | 2-4 cP | 4-65 degC | 100 s-1 | +/- 5% |
| Cream (18% fat) | Dairy processing | 15-50 cP | 4-40 degC | 100 s-1 | +/- 5% |
| Heavy cream (36% fat) | Whipping, baking | 100-1,000 cP | 4-30 degC | 50 s-1 | +/- 3% |
| Yogurt (set-style) | Fermentation monitoring | 1,000-3,000 cP | 4-42 degC | 10 s-1 | +/- 5% |
| Yogurt (stirred) | Filling, blending | 300-800 cP | 4-20 degC | 100 s-1 | +/- 5% |
| Honey (raw) | Processing, crystallization | 2,000-10,000 cP | 20-50 degC | 10 s-1 | +/- 3% |
| Honey (pasteurized) | Filling, storage | 2,000-5,000 cP | 20-40 degC | 10 s-1 | +/- 3% |
| Chocolate (dark) | Tempering, coating | 3,000-30,000 cP | 35-55 degC | 5 s-1 | +/- 5% |
| Chocolate (milk) | Tempering, coating | 1,500-10,000 cP | 35-55 degC | 5 s-1 | +/- 5% |
| Ketchup | Filling, pumping | 200-1,500 cP | 20-50 degC | 50 s-1 | +/- 5% |
| Mayonnaise | Filling, spreading | 500-5,000 cP | 5-25 degC | 50 s-1 | +/- 5% |
| Salad dressing | Emulsification, filling | 300-2,000 cP | 5-30 degC | 50 s-1 | +/- 5% |
| Tomato paste | Concentration, pumping | 1,000-10,000 cP | 50-90 degC | 50 s-1 | +/- 5% |
| Peanut butter | Mixing, filling | 5,000-50,000 cP | 20-40 degC | 10 s-1 | +/- 5% |
| Caramel | Confectionery processing | 500-5,000 cP | 80-120 degC | 50 s-1 | +/- 5% |
| Sugar syrup | Confectionery, beverage | 50-500 cP | 20-80 degC | 100 s-1 | +/- 3% |
| Corn syrup | Confectionery processing | 200-2,000 cP | 20-80 degC | 50 s-1 | +/- 3% |
| Soy sauce | Fermentation, filling | 50-200 cP | 5-40 degC | 100 s-1 | +/- 5% |
| Olive oil | Processing, filling | 30-80 cP | 15-40 degC | 100 s-1 | +/- 5% |
| Margarine | Emulsification, packing | 1,000-5,000 cP | 5-40 degC | 50 s-1 | +/- 5% |
Temperature Sensitivity of Food Viscosity
| Food Category | Typical Temp-Visc Coefficient | Application Notes |
|---|---|---|
| Honey and syrups | 5-7% per degC | Critical ATC required |
| Chocolate and cocoa | 4-6% per degC | Fat content affects sensitivity |
| Dairy (milk, cream) | 2-3% per degC | Protein and fat content |
| Yogurt and fermented | 3-5% per degC | Gel network sensitivity |
| Sauces (tomato-based) | 3-5% per degC | Solids concentration |
| Oils and fats | 3-4% per degC | Triglyceride composition |
| Sugar solutions | 2-3% per degC | Concentration-dependent |
Frequently Asked Questions
What viscometer meets 3-A sanitary standards for food processing?
The LONN-ND80 tuning fork viscometer is available with 3-A sanitary certification option for food processing applications. The 3-A certified version features Ra ≤ 0.8 µm wetted surface finish, FDA-compliant EPDM or PTFE seals, tri-clamp or DIN 11851 process connections, and CIP-compatible design. For high-viscosity food products above 5,000 cP (chocolate, peanut butter, caramel), the LONN-DN60 high-viscosity inline viscometer with 3-A compatible design covers 0-5,000,000 cP.
How does the viscometer handle CIP cleaning in food applications?
The LONN-ND80 is designed for CIP (Clean-In-Place) compatibility. The standard CIP cycle for food processing includes: pre-rinse with water (2-5 minutes), caustic wash at 1-2% NaOH, 70-85°C (10-20 minutes), acid rinse at 0.5-1% nitric or phosphoric acid (5-10 minutes), final water rinse, and optional sanitizing rinse. The 316L stainless steel wetted materials are fully compatible with these chemicals. The sensor does not require disassembly for cleaning — the CIP solution flows past the sensor fork during the cleaning cycle, removing all product residue. After CIP, the sensor responds immediately with no calibration shift.
How does temperature compensation work for honey viscosity measurement?
Honey viscosity changes by approximately 5-7% per °C near room temperature — making temperature compensation essential for any honey food viscosity measurement application. The LONN-ND80 uses a PT1000 RTD (accuracy ±0.1°C) to measure the honey temperature and applies a honey-specific temperature-viscosity correction curve. The corrected viscosity is reported at a reference temperature (typically 20°C or 25°C). Without ATC, a 5°C temperature variation would produce a 25-35% viscosity error. With ATC active, the residual error is less than ±1% of full scale.
Can the viscometer measure viscosity in products with fruit pieces or particulates?
The LONN-ND80 tuning fork viscometer is designed for clean, homogeneous food products. Products containing large particulates (fruit pieces above 2mm, nuts, chocolate chips) can interfere with the viscosity measurement by physically striking or coating the fork tines. For products with small particulates (cocoa particles below 20 µm, emulsified fat droplets), the viscometer provides an aggregate viscosity reading that includes the particulate effects. For products with large particulates, the LONN-ND80 should be installed in a process location where the product is homogenized (after a high-pressure homogenizer) or in a bypass loop with a strainer to remove large particulates.
Food Viscosity Measurement: Technical Specifications
The LONNMETER viscometers for food processing provide the following key technical specifications for food viscosity measurement applications:
| Parameter | LONN-ND80 (Food Grade) | LONN-DN60 (Food Compatible) |
|---|---|---|
| Viscosity range | 0.5-5,000 cP | 0-5,000,000 cP |
| Viscosity accuracy | ±1% FS | ±3% FS |
| Density accuracy | ±0.001 g/cm3 | N/A |
| Temperature accuracy | ±0.1 degC (PT1000) | ±1.0 degC (KTY) |
| Maximum temperature | 150 degC | 300 degC |
| Maximum pressure | 20 MPa | 10 MPa |
| Wetted materials | 316L SS (Ra <= 0.8 um) | 316L SS |
| Food contact materials | FDA-compliant | FDA-compliant |
| 3-A certification | Available (optional) | Available (optional) |
| Process connections | Tri-clamp, DIN 11851 | Flanged ANSI |
| Output signal | 4-20mA, RS-485 Modbus RTU | 4-20mA, RS-485 Modbus RTU |
Food Viscosity Measurement: Verified Performance Data and Traditional Method Comparison
Performance Data from Field Installations
The following food viscosity measurement performance data has been verified from LONNMETER installations:
- Honey crystallization monitoring: inline food viscosity measurement detects viscosity increase of 10-15% at the onset of crystallization (from LONN-ND80 food-grade inline viscometer, at 25 degC with ATC active, ±0.5% FS accuracy)
- Yogurt fermentation monitoring: food viscosity measurement tracks fermentation progress from 4 cP (initial milk) to 1,500 cP (finished yogurt) with ±2% accuracy at each stage
- Chocolate tempering optimization: LONN-DN60 food viscosity measurement maintains chocolate viscosity at target within ±3% during continuous tempering process (verified across 8-hour production shifts)
- Tomato sauce concentration control: inline food viscosity measurement achieves ±2.5% concentration control accuracy using viscosity as the concentration proxy (from LONN-ND80 in 500 cP range)
Comparison: Inline vs. Traditional Food Viscosity Measurement
| Method | Measurement Frequency | Typical Accuracy | Time Lag | Labor Required |
|---|---|---|---|---|
| Inline food viscosity measurement (LONN-ND80) | Continuous (real-time) | ±1% FS | <5 seconds | Zero ongoing labor |
| Laboratory rotational viscometer | 1-2 tests per batch | ±2-3% | 30-60 minutes | 15-30 min per test |
| Bostwick consistometer | 1-3 tests per batch | Qualitative | 10-20 minutes | 5 min per test |
| Falling ball viscometer | 1-2 tests per batch | ±5-10% | 20-40 minutes | 10 min per test |
| Flow cup | 1-3 tests per batch | ±5-10% | 5-15 minutes | 3 min per test |
| Capillary viscometer | 1 test per batch | ±1-2% | 40-60 minutes | 20 min per test |
The LONNMETER food viscosity measurement solution delivers continuous real-time data at ±1% FS accuracy — compared to 30-60 minute time lag and ±3-10% accuracy with laboratory methods.
Why LONNMETER for Food Viscosity Measurement?
LONNMETER offers purpose-engineered solutions for food processing food viscosity measurement:
- LONN-ND80 tuning fork viscometer (3-A certified option): 0.5-5,000 cP, ±1% FS, PT1000 ATC, Ra ≤ 0.8 µm wetted surface, FDA-compliant seals, tri-clamp process connections — for dairy, sauces, dressings, honey, and beverages. The best combination of accuracy, sanitary design, and CIP compatibility.
- LONN-DN60 high-viscosity inline viscometer (3-A compatible option): 0-5,000,000 cP, ±3% FS, up to 300°C — for chocolate, peanut butter, caramel, and high-viscosity specialty foods.
- Application engineering: LONNMETER engineers have direct experience in food viscosity measurement across dairy processing, confectionery manufacturing, sauce and condiment production, and honey processing — helping you establish the process correlation, configure the food-specific temperature compensation algorithm, and achieve 3-A sanitary compliance.
Request a Quote
Need an inline viscometer for your food processing application? Contact our application engineering team with your specific requirements — food product type, viscosity range, process temperature, sanitary standards requirement (3-A, EHEDG), CIP procedure, and output signal — and we will recommend the optimal technology and configuration.
Email: anna@xalonn.com Brand: LONNMETER | smartmeasurer.com or Fill out our RFQ form
All LONNMETER inline viscometers are manufactured in ISO 9001 certified facilities. 3-A sanitary certification available for food processing applications. FDA food contact materials documentation provided. Lead time: 2-4 weeks standard.