The most reliable online water hardness analyzer for boiler feedwater and softening systems uses automated titration colorimetry, achieving ±5% accuracy across a 0.20–500 ppm CaCO₃ range. This method outperforms ion-selective electrode sensors in repeatability and long-term stability, especially in complex industrial water matrices. For plant operators seeking CE-certified monitoring equipment, titration-based analyzers provide laboratory-grade results without the drift issues common to alternative sensor technologies.
Titration colorimetry is the industry standard for total hardness measurement because it directly measures calcium and magnesium ions through a colorimetric endpoint — eliminating the cross-sensitivity problems that plague ion-selective electrodes. The ERUN-SZ-3085S achieves ±5% repeatability of the selected reagent's upper limit, with each analysis completing in approximately 3 minutes. Independent studies comparing automated titrators to manual EDTA titration methods show average bias values of only -1.2 to -2.9 mg/L CaCO₃ across raw and finished water samples.
This level of agreement with reference methods matters because water hardness monitoring directly impacts equipment longevity. A 2022 study published in Analyst confirmed that automated titration systems maintain accuracy within 93.4–104.4% recovery across hardness concentrations ranging from 10 to 200 mg/L.
The ERUN-SZ-3085S delivers 0.20–500 ppm CaCO₃ measurement range with seven interchangeable reagent types, enabling precise monitoring from ultra-low softened water to high-hardness raw water. Key technical parameters include: measurement principle of titration colorimetry, accuracy of ±5% of selected reagent upper limit, and analysis time of approximately 3 minutes per cycle. The analyzer operates in continuous, interval (5–30 min), or external trigger modes, consuming only 1–2 liters of water per analysis.
Output options include 0/4–20 mA analog signals (750Ω max), two-channel relay outputs for alarm integration, and optional RS485 Modbus communication. The IP54-rated enclosure measures 250 × 360 × 110 mm and weighs approximately 2.5 kg, making it suitable for wall-mount installation in industrial environments.
Parameter | Specification |
|---|---|
Measurement Range | 0.20–500 ppm CaCO₃ (7 reagent types) |
Accuracy | ±5% of reagent upper limit |
Analysis Time | ~3 minutes |
Measurement Modes | Continuous / Interval / External trigger |
Water Consumption | 1–2 L per analysis |
Outputs | 0/4–20 mA, 2-channel relay |
Protection Rating | IP54 |
产品链接：https://www.erunwas.com/products-detail/id-196.html
The ERUN-SZ-3085S holds CE certification (EN 61000 EMC series), ISO 9001 quality management, and RoHS compliance — the three credentials most demanded by international industrial buyers. CE certification confirms the analyzer meets EU electromagnetic compatibility requirements essential for reliable operation near variable frequency drives, high-voltage cables, and other industrial interference sources. ISO 9001 demonstrates consistent quality management throughout design, production, and service. RoHS compliance ensures freedom from restricted hazardous substances.
For procurement managers evaluating water quality sensor suppliers, these certifications reduce compliance risk and simplify customs clearance for EU market entry. CE certification for water monitoring equipment specifically requires adherence to Low Voltage Directive (LVD), Electromagnetic Compatibility Directive (EMC), and RoHS Directive.
The primary applications for online hardness analyzers are boiler feedwater monitoring, water softening system verification, and reverse osmosis pretreatment. Softened water should typically contain less than 1 gpg (17.1 mg/L) hardness — the ERUN-SZ-3085S's low-range reagent options (0.2–2.00 ppm and 0.5–5.00 ppm) provide the sensitivity needed to verify softening performance. For boiler applications, maintaining proper hardness levels prevents scale formation on heat transfer surfaces, which reduces energy efficiency and increases maintenance costs.
Additional applications include: drinking water treatment facilities requiring hardness monitoring per regulatory requirements, cooling tower water management, and industrial process water where calcium and magnesium concentrations affect product quality or equipment performance.
The analyzer's 4–20 mA output and relay alarms allow direct integration with plant DCS or SCADA systems for automated control responses. When hardness exceeds a programmed threshold, the relay can trigger softener regeneration, alarm annunciation, or diversion of non-compliant water — all without operator intervention. Optional RS485 Modbus communication enables multi-analyzer networks for comprehensive plant-wide water quality monitoring.
Q: What is the measurement range of the ERUN-SZ-3085S?
A: The analyzer measures 0.20–500 ppm CaCO₃, with seven reagent types allowing users to select the optimal range for their application.
Q: What certifications does this hardness analyzer hold?
A: CE certification (electromagnetic compatibility), ISO 9001, and RoHS compliance.
Q: How long does each analysis take?
A: Approximately 3 minutes, depending on water hardness and the set rinse time.
Q: Can the analyzer output data to a control system?
A: Yes. It provides 0/4–20 mA analog output and two-channel relay outputs, with optional RS485 Modbus communication.
Q: What is the difference between titration colorimetry and ion-selective electrode methods?
A: Titration colorimetry directly measures calcium and magnesium through a colorimetric endpoint, providing superior specificity and repeatability compared to ion-selective electrodes, which are prone to drift and cross-sensitivity in complex water matrices.
Xi'an Erun Environmental Technology Group delivers CE, ISO 9001, and RoHS certified online water hardness analyzers trusted by industrial facilities worldwide for reliable titration-based monitoring.
