Precise monitoring of
Menthol in acetone
for optimal product quality
Inline concentration measurement of menthol in acetone solutions for pharmaceutical and cosmetic production processes.
Maintenance-free LiquiSonic® Ultrasonic sensors ensure continuous quality control in real-time.
±0.05 wt% accuracy
Real-time measurement
Maintenance-free
Cost-saving
Why is menthol concentration measurement in acetone a special challenge?
The pharmaceutical and cosmetic industry uses menthol in acetone solutions for various critical processes. This creates complex measurement tasks that require the highest precision and reliability.
Typical challenges
- Crystallization with fluctuating concentrations
- Impurities affect product purity
- Temperature-dependent solubility of menthol
- Time delay in laboratory analyses
- High demands on measurement methods
Typical requirements
- Pharma quality requires high accuracy
- Continuous monitoring for batch consistency
- Consider explosive atmosphere
- Validatable measurement methods required
Conventional measurement methods fail with contaminated solutions or are not suitable for inline applications. The result: production stoppages, quality issues, and correspondingly high costs. Discover our solution!
Our solution for precise menthol concentration measurements
LiquiSonic® measurement system
The LiquiSonic® system solves the challenges of menthol measurement in acetone through innovative ultrasonic velocity measurement. This unique technology from SensoTech enables precise, continuous concentration measurement directly in the process.
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High measurement accuracy for high quality standards
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Maintenance-free operation without mechanical wear parts
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Sample-free inline measurement without process interruption
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Ex protection available for safe applications
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Digital integration into process control systems
Technical details and specifications
Ultrasonic measuring principle
The LiquiSonic® System is based on the precise measurement of the absolute sound velocity in liquids. Ultrasonic waves are transmitted through the menthol-acetone solution at high frequency. The transit time measurement is performed several times per second, allowing concentration changes of up to 0.05 wt% to be reliably detected in real-time.
Technical Specifications
Measurement Range (Concentration) | 0.1 - 100 wt% |
Measurement Accuracy | typically ±0.05 wt% |
Repeatability | ±0.02 wt% |
Temperature Range | -40 °C to 200 °C |
Pressure Range | up to 500 bar |
Sensor Length | up to 3000 mm |
Material & Coating | Stainless steel, Hastelloy, PFA, PVDF, ETFE, ... |
Digital Transmission | up to 1,000 m (more on request) |
Interfaces | 4-20 mA, Profibus, Ethernet, Modbus, Fieldbus, ... |
Protection Class | IP65 & Ex protection available |
Calibration | One-time factory calibration |
Maintenance | Completely maintenance-free |
Individual Customizations
Individual Customizations
SensoTech manufactures sensors individually according to your requirements. Especially for menthol-acetone applications, special materials or designs are often necessary:
Special Materials
• Chemically resistant special alloys
• PTFE coatings for highest purity
• Special flanges for pharmaceutical applications
Custom Geometry
• Compact sensors for small pipes
• Extended designs for thick insulations
• Special geometries for crystallization vessels
Economic Benefit
Economic Benefit
Through continuous monitoring, time-consuming batch changes are eliminated and waste is reliably reduced. The maintenance-free operation as well as the elimination of sample analyses reduce laboratory and operating costs significantly. Thanks to precise dosing, material costs decrease, while (re-)calibration is not required.
Typical payback period 8-12 months!
Application Examples
LiquiSonic® sensors find a wide range of applications in the pharmaceutical industry and cosmetic production.
Pharmaceutical Industry
- Menthol Crystallization: Precise monitoring of supersaturation
- Cleaning Processes: Control of solvent purity
- Tablet coating Menthol solutions for coating
- Tropfen & Pastillen: Flavor dosing
Cosmetics & personal care
- Toothpaste production Menthol dosing for different flavors
- Mouthwashes Various dosages for Cooling effects
- Skincare products Menthol for cooling effects
- Shampoos Refreshing formulas
- Deodorants Menthol as a natural additive
Special applications
- Flavor extraction Concentration of natural menthol extracts
- Solvent recovery Acetone recovery in cleaning
- Quality control Incoming inspection of raw materials
- Batch documentation Batch tracking and release
- Process optimization Yield maximization through precise control
Further success stories and references
Detailed case studies and customer references are available from our sales team. Contact us for specific application examples from your industry.
The main benefits at a glance
Precise real-time measurement
Robust & maintenance-free
Short amortization period
Continuous quality control
Frequently asked questions
SensoTech GmbH is a leading company in the field of process measurement technology based in Barleben, near Magdeburg, Germany. We develop and produce innovative solutions for monitoring and optimizing industrial processes. Our specialization lies in the precise measurement of concentrations, densities, and other parameters in liquids – in real-time and directly during the process.
Unlike optical methods, which are influenced by color or turbidity, conductivity-based methods, which are sensitive to electrical conductivity, or density-based methods, which can be disturbed by temperature or gas bubbles, our ultrasonic method is independent of these influences.
The LiquiSonic® measurement technology also contains neither moving parts nor components that can wear out or be consumed. After installation, the measurement system is therefore completely maintenance-free and drift-free.
The sensors offer digital signal transmission up to 1000 m and enable continuous inline measurement without sampling.
The system provides measurements in real-time. Based on the measurements, you receive a current measurement value every second when monitoring
menthol in acetone. This fast response time enables effective process control and early detection of deviations.
Since the speed of sound, like all other physical quantities, is influenced by temperature, all our LiquiSonic® sensors are equipped with temperature sensors. This allows the influence of temperature on the measurement to be directly compensated Therefore, it is not necessary to integrate additional temperature sensors.
Our sensors operate reliably in a temperature range from -40 °C to 200 °C and pressures up to 500 bar. Through various material options such as stainless steel, Hastelloy, or PFA coatings, aggressive media can also be measured. Explosion protection for Zone 1 and 2 is also available.
Yes, our sensors are designed for extreme conditions. In addition to the extended temperature and pressure range, we offer custom adaptations such as sensor lengths up to 3000 mm, special alloys for corrosive media, and various protection types, such as optional explosion protection. Each sensor is individually according to your requirements configured.
Our system uses ultrasonic transit time measurement to determine the speed of sound in the liquid. The speed of sound directly correlates with the acetone-mentholconcentration and allows measurement accuracies of ±0.05 wt%. The integrated temperature compensation ensures stable results even with fluctuating process conditions.
Yes, by combining the speed of sound measurement with additional physical quantities (e.g., conductivity), mehrere Komponenten can be determined simultaneously. This also allows monitoring of additional additives.
The system offers various digital interfaces (e.g., Profibus, Ethernet/IP, Foundation Fieldbus) as well as analog 4-20 mA outputs. The integration is seamless via standardized protocols.
Yes, SensoTech manufactures sensors individually according to customer requirements. All standard flanges are available, any installation lengths (up to at least 1000 mm, further lengths on request), various threads, and special geometries for crystallization containers or small pipelines.
The system is completely maintenance-freeThere are no mechanical wear parts, seals, or optical windows that could be compromised. Regular calibration is not required - the sensors remain stable for years.
Related applications
Phase separation
SensoTech's inline measurement technology enables reliable detection of phase boundaries in liquids in real time, thus supporting stable process management and consistently high product quality.
Ethanol
For continuous monitoring of ethanol concentrations, SensoTech offers maintenance-free ultrasonic sensors that provide precise measurement results directly in the process – without sampling.
Incoming goods inspection
SensoTech's liquid identification allows for quick and secure inspection of delivered media in incoming goods, thus contributing to quality assurance and process safety.