Portable Density and Concentration Meter - DMA 35 | DMA 35 Ex | DMA 35 Ex Petrol | DMA 35 Ampere

Importance of the topic

Accurate density and concentration determination is crucial in chemical manufacturing, food and beverage production, battery maintenance and safety regulated processes. Portable solutions that deliver laboratory grade performance on site streamline quality control workflows, reduce sample transport delays and support real time decision making.

Objectives and Overview

This application note presents the DMA 35 series, a family of handheld density and concentration meters that build on the oscillating U-tube principle to offer fast, reliable measurements across a wide range of sample types. The document outlines device variants, measurement capabilities and compliance with international standards.

Methodology

• Measurement principle based on an oscillating U tube made of borosilicate glass for high thermal and chemical stability
• Viscosity correction algorithm to maintain accuracy even with samples up to 300 mPa s
• One handed gesture controls and limit check functions for simplified field operation

Instrumentation

The DMA 35 series includes standard, Ex, Ex Petrol and Ampere variants:

• Standard model for general density, specific gravity and concentration analysis
• Ex and Ex Petrol models with intrinsic safety approvals for use in hazardous environments
• Ampere model optimized for measuring sulfuric acid density in lead acid batteries over extended temperature ranges

Key results and discussion

The DMA 35 delivers density measurements from 0 to 3 g cm3 with accuracy of 0.001 g cm3 and temperature precision of 0.2 C. Repeatability (s d) is 0.0005 g cm3 and reproducibility is 0.0007 g cm3. The instrument supports sample temperatures from 0 to 100 C and ambient operation from -10 to 50 C depending on the variant.

Benefits and Practical Applications

• Rapid sugar and extract content checks during wort fermentation in breweries
• Direct alcohol concentration measurement in distilled spirits
• Specific gravity monitoring for battery maintenance in power installations
• On site quality control of acids, polymers and process fluids in chemical plants

Future trends and opportunities

The integration of portable density meters with wireless networks and cloud based data management will enable predictive maintenance and remote monitoring. Advances in sensor miniaturization and enhanced safety approvals will broaden applications in field analytics and hazardous zones.

Conclusion

The DMA 35 series offers a versatile, robust solution for portable density and concentration measurements. Its combination of high precision, safety compliance and user friendly features makes it an industry standard for on site quality assessment.

References

• ASTM D7777
• IP 559
• ISO 15212-1
• Patent AT516421 (B1)
• Patent EP3015847 (B1)