
Overview
Optimize the efficiency and performance of your commercial reverse osmosis (RO) system with the HM Digital LDM-100R Commercial Grade Dual Line EC/TDS % Rejection Monitor. This advanced instrument provides comprehensive analysis by simultaneously measuring the total dissolved solids (TDS) and electrical conductivity (EC) of both the influent (feed) and effluent (product) water streams. Crucially, it automatically calculates the percentage of TDS rejection, offering immediate and vital insights into the effectiveness of your RO system's membrane performance. Designed for continuous monitoring in demanding commercial environments, the LDM-100R features extended battery life, a durable build, and a large, clear display for easy data interpretation, ensuring you can maintain optimal water purification and system efficiency.
Key Features
- Dual Line Monitoring: Simultaneously measures TDS and EC in two separate water lines (input and output) for comprehensive RO system analysis.
- EC/TDS Measurement: Clearly displays both Electrical Conductivity (EC) and Total Dissolved Solids (TDS) levels for both the feed and product water.
- Automatic % Rejection Calculation: Instantly calculates and displays the percentage of TDS rejected by the RO membrane, providing a direct measure of system efficiency.
- Extended Battery Life: Engineered for continuous, long-term monitoring, powered by readily available AA batteries.
- Commercial Grade Durability: Robust construction designed to withstand the rigors of demanding commercial and industrial environments.
- Large, Easy-to-Read Display: Provides clear and straightforward presentation of all measured parameters and the calculated rejection percentage.
Specifications
- Brand: HM Digital
- Model: LDM-100R
- Parameters Measured: Total Dissolved Solids (TDS), Electrical Conductivity (EC), Percentage of TDS Rejection (% Rejection)
- TDS Measurement Range: 0-9999 ppm (mg/L); 0-10.0 ppt (g/L)
- EC Measurement Range: 0-9999 µS; 0-20.00 mS
- Accuracy: +/- 2% of reading
- Resolution: 0.1 ppm/µS (0-99.9); 1 ppm/µS (100-9999)
- Temperature Compensation: Automatic
- Power Source: 2 x 1.5V AA batteries
- Display: Large LCD
- Probe Connections: Two inlet ports for separate feed and product water lines
Ideal for
Specifically designed for monitoring the performance of commercial reverse osmosis (RO) systems in water treatment facilities, ensuring efficient and effective water purification. Essential for industrial water purification processes where maintaining optimal RO system rejection rates is critical for water quality. Valuable for aquariums and aquaculture systems utilizing RO water, providing crucial data on water purity and system efficiency. Applicable in any setting requiring precise and simultaneous TDS and EC monitoring of two separate water streams, along with automatic calculation of RO rejection rates.
Performance and Characteristics
The HM Digital LDM-100R provides accurate and simultaneous measurement of TDS and EC in both the input and output water of an RO system. Its key performance feature is the automatic calculation of the TDS rejection percentage, offering an immediate and clear indicator of the RO membrane's effectiveness. The large, easy-to-read display ensures that operators can quickly assess system performance. The extended battery life allows for continuous monitoring without frequent replacements. Built with commercial-grade durability, this monitor is designed to withstand the demands of industrial environments, providing reliable and long-lasting performance. By providing real-time rejection data, the LDM-100R enables proactive maintenance and optimization of RO systems, ensuring consistent water quality and reducing operational costs.
Additional Information
HM Digital is a reputable manufacturer specializing in high-quality water quality testing and monitoring instruments. The LDM-100R is specifically designed to meet the needs of commercial RO system operators, providing essential data for system performance evaluation and optimization. The simultaneous dual-line monitoring eliminates the need for manual measurements and calculations, saving time and reducing the potential for errors. By tracking the TDS rejection rate, users can identify potential membrane fouling or degradation early, allowing for timely maintenance and ensuring consistent water purity. This monitor is a valuable tool for maximizing the efficiency and lifespan of commercial RO systems.
Kit Contents
- HM Digital LDM-100R Dual Line EC/TDS % Rejection Monitor
- Two Inlet Ports for Water Line Connections
- Mounting Hardware
- User Manual
Ensure the optimal performance and efficiency of your commercial RO system with the advanced HM Digital LDM-100R EC/TDS % Rejection Monitor! Gain crucial insights into your system's effectiveness today.

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Range | 0-9999 ppm (mg/L); 0-10.0 ppt (g/L); EC: 0-9999 µS; 0-20.00 mS |
Accuracy | +/- 2% |
Resolution | 0-99.9: 0.1 ppm/µS; 100-9999: 1 ppm/µS |
ATC | Yes (1 - 65°C) |
Calibration | Digital to any point |
Sensor | 1/2" NPT threaded |
Sensor Cable | 3 m (9.8 ft.) cable |
Power Source | 2 x 1.5V AA batteries |
Battery Life | Approx. 2 years |
Dimensions | 12 x 7.5 x 2.6 cm (4.7 x 3 x 1 in) |
Weight | 198g (7 oz.) |
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