HengaoDe HAD-3SS Tri-Parameter Water Hardness Analyzer for Calcium, Magnesium, and Total Hardness
| Brand | HengaoDe |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | HAD-3SS |
| Price | USD 42.50 (FOB) |
| Measurement Range (Hardness) | 0–1000 mg/L as CaCO₃ |
| Measurement Range (Ca²⁺) | 0–1000 mg/L |
| Measurement Range (Mg²⁺) | 0–500 mg/L |
| Resolution | 0.1 mg/L |
| Repeatability | ≤2% RSD |
| Accuracy | ±5% FS ±1 digit |
| Power Supply | AC 220 V, 50 Hz |
Overview
The HengaoDe HAD-3SS Tri-Parameter Water Hardness Analyzer is a field-deployable, benchtop-capable electrochemical instrument engineered for the simultaneous quantification of calcium ion (Ca²⁺), magnesium ion (Mg²⁺), and total water hardness (expressed as mg/L CaCO₃ equivalent) in aqueous samples. It operates on the principle of ion-selective electrode (ISE) potentiometry, calibrated against NIST-traceable standard solutions. Unlike single-parameter test kits or colorimetric dip strips, the HAD-3SS delivers direct digital readouts with built-in temperature compensation (ATC), eliminating manual correction and reducing operator-induced variability. Designed for operational robustness in non-laboratory environments—including municipal water treatment facilities, agricultural irrigation monitoring stations, industrial boiler feedwater control points, and university teaching labs—the instrument meets functional requirements aligned with ASTM D1126 (Standard Test Method for Hardness in Water) and ISO 6059 (Water quality — Determination of calcium and magnesium — EDTA titrimetric method), serving as a rapid screening tool prior to confirmatory titration or ICP-OES analysis.
Key Features
- Triple-parameter capability: Simultaneous measurement of Ca²⁺, Mg²⁺, and total hardness from a single sample aliquot
- Integrated temperature sensor with automatic compensation (0–50 °C range)
- Backlit LCD display with real-time numeric output and unit toggle (mg/L, ppm, mmol/L)
- Calibration memory stores up to three-point calibration data per ion channel
- Low-power design enabling >8 hours of continuous operation on internal rechargeable battery (optional)
- IP65-rated enclosure for resistance to dust and incidental water splashing during field use
- Electrode port compatible with industry-standard BNC connectors for interchangeable ISE probes
Sample Compatibility & Compliance
The HAD-3SS accepts liquid samples with conductivity < 2 mS/cm and turbidity 0.5 mg/L, Al³⁺ > 0.3 mg/L, or suspended solids > 10 mg/L) require pre-filtration (0.45 µm membrane) or chelation masking per ASTM D1126 Annex A2. While not certified to ISO/IEC 17025 for accredited testing, the instrument supports GLP documentation workflows through manual logbook integration and conforms to basic electrical safety standards IEC 61010-1 for laboratory equipment. Its measurement uncertainty budget is traceable to SRM 1643e (NIST Natural Water Standard).
Software & Data Management
The HAD-3SS operates autonomously without PC dependency; however, optional USB-C interface enables data export in CSV format for post-processing in Excel, LabChart, or LIMS platforms. Firmware v2.1 supports timestamped logging of up to 500 measurements with user-defined sample IDs. No proprietary software installation is required—data transfer uses standard mass storage mode. Audit trail functionality complies with FDA 21 CFR Part 11 principles when paired with external electronic lab notebook (ELN) systems, though the device itself does not implement electronic signatures or role-based access control.
Applications
- Real-time verification of lime-soda softening efficiency in water treatment plants
- Monitoring hardness breakthrough in ion exchange resin columns
- Field assessment of irrigation water suitability per FAO guidelines (hardness < 150 mg/L recommended for drip systems)
- Quality control of boiler feedwater to prevent scale formation (ASME PTC 19.11)
- Undergraduate analytical chemistry experiments on complexometric equilibria and selectivity coefficients
- Pre-screening of bottled water compliance with EU Directive 2009/54/EC (maximum 150 mg/L CaCO₃)
FAQ
Does the HAD-3SS require daily recalibration?
No—calibration stability exceeds 72 hours under stable ambient conditions. Recalibration is recommended before each batch of samples or after electrode cleaning.
Can it measure seawater or brackish water?
Not directly. High ionic strength (>10,000 µS/cm) causes significant junction potential drift. Dilution to < 3,000 µS/cm with deionized water is required, with appropriate dilution factor correction.
Is electrode maintenance documented in the manual?
Yes—Section 4.2 details storage protocol (3 M KCl solution), cleaning sequence for organic fouling (ethanol rinse), and rehydration procedure for dry-stored ISE membranes.
What is the expected lifetime of the calcium and magnesium ISEs?
Typical service life is 12–18 months with proper handling and storage; performance degradation is indicated by >15 mV drift in zero-calibration or reduced slope (<25 mV/decade).
Does the instrument support GLP-compliant reporting?
It generates raw measurement records suitable for inclusion in GLP study reports; however, full audit trail generation requires integration with an external ELN or LIMS system.
