Digital Conductivity/TDS Meter EI-DVI Model 641: Professional Water Analysis Solution
Product Overview
The EI-DVI Digital Conductivity/TDS Meter Model 641 is a professional, high-precision instrument engineered for the rapid and accurate determination of Electrical Conductivity (EC) and Total Dissolved Solids (TDS) in aqueous solutions. Utilizing the latest microcontroller technology and integrated solid-state circuit components, the Model 641 delivers reliable and precise measurements required for quality control, research, and environmental monitoring. The instrument is designed for professional laboratory environments, offering durability and user-friendly operation.
Key Features and Technology
The Model 614 incorporates advanced features to simplify complex water analysis:
• Dual Measurement: Measures both Conductivity and TDS simultaneously.
• Microcontroller Based: Uses modern microcontroller technology for precise signal processing.
• Auto Ranging Facility: The appropriate measurement range is automatically selected by the instrument across its five wide ranges, ensuring ease of use.
• High Visibility Display: Features a clear 3½ Digit Bright Red LED Display for easy reading of results.
• Adjustable Cell Constant: The cell constant is flashed on the digital display and can be adjusted from the front panel.
• Auto Cell Constant Measurement: Includes a facility for automatic measurement of the cell constant using a known standard solution, ensuring calibration accuracy.
• Premium Sensor: Equipped with a Platinum DIP Type Conductivity/TDS Cell for optimal and consistent long-term performance.
Measurement Precision and Range
This meter provides comprehensive coverage, suitable for testing solutions ranging from relatively pure water to highly concentrated brine solutions. It converts measured electrical conductivity into estimated TDS values using a predetermined conversion factor.
The impressive range capability includes Conductivity spanning from 0 – 200 µS/cm up to 0 – 1000 mS/cm, and TDS covering 0 – 200 ppm up to 0 – 1000 ppt (parts per thousand). With a high resolution of 0.1 µS/cm for conductivity and 0.1 ppm for TDS in the lowest ranges, the meter can detect even minute changes in concentration. Accuracy is maintained at ±0.5 % FS ± 1 Digit. Furthermore, the instrument features manual temperature compensation across a 0 to 50°C range to ensure consistent readings regardless of temperature variations.
Versatile Applications
The EI-DVI Model 641 is an extremely useful instrument across numerous fields concerned with monitoring dissolved solids and salt contents in water and soluble salts in soils.
• Environmental Monitoring: Essential for assessing the quality of drinking water, surface water (rivers, lakes), groundwater, and monitoring the efficiency and effluent quality of wastewater treatment plants.
• Industrial Applications: Crucial for process water monitoring, managing cooling tower systems, testing boiler water to prevent scaling, and quality control in chemical processing and desalination plants.
• Agriculture and Hydroponics: Ideal for soil analysis labs, monitoring irrigation water salinity levels, and precisely controlling nutrient solutions in hydroponic systems for optimal plant growth.
• Aquatic Environments: Used in swimming pools, spas, mineral water plants, and aquaculture setups to maintain appropriate water conditions for aquatic species.
Technical Specifications: Model 641 EI-DVI Digital Conductivity/TDS Meter
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Parameter
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Specification Details
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Model Name/Number
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641
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Brand
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EI / EI-DVI
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Technology
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Microcontroller Based, Solid-State, Integrated Circuit Design
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Display
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3½ Digit Bright Red LED Display
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Conductivity Ranges (Five Ranges)
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0 – 200 µS/cm, 0 – 2 mS/cm, 0 – 20 mS/cm, 0 – 200 mS/cm, 0 – 1000 mS/cm
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TDS Ranges (Five Ranges)
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0 – 200 ppm, 0 – 2 ppt, 0 – 20 ppt, 0 – 200 ppt, 0 – 1000 ppt
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Range Selection
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Automatic
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Resolution (Lowest Range)
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0.1 µS/cm (Conductivity) / 0.1 ppm (TDS)
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Accuracy
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±0.5 % FS ± 1 Digit
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Cell Constant
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Adjustable on Digital Display; Auto Cell Constant Measurement Available
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Temperature Compensation
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Manual: 0 to 50°C
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Measuring Cell Type
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Platinum DIP Type Conductivity/TDS Cell
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Power Requirements
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12V DC using Adapter (110 to 250V AC, 50 Hz input)
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Dimensions (L x B x H)
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270 x 202 x 80 mm (Approx.)
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Weight
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0.8 Kg (Approx.)
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Usage/Application
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Laboratory, Water Quality Testing, Industrial, Agricultural
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Included Accessories
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Conductivity/TDS Cell, Operation Manual, Cell Stand, Dust Cover, 12V Adapter
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