HACH HMA-CR6 Online Hexavalent Chromium Analyzer
| Brand | HACH |
|---|---|
| Origin | Imported |
| Manufacturer Type | Manufacturer |
| Model | HMA-CR6 |
| Pricing | Upon Request |
Overview
The HACH HMA-CR6 Online Hexavalent Chromium Analyzer is an industrial-grade, fully automated spectrophotometric analyzer engineered for continuous, unattended monitoring of hexavalent chromium (Cr(VI)) in aqueous matrices. It operates on the standardized diphenylcarbazide (DPC) colorimetric method—per ASTM D5281 and ISO 11084—where Cr(VI) reacts with DPC under acidic conditions to form a stable, intensely colored complex with maximum absorbance at 540 nm. This reaction is highly selective for Cr(VI) over trivalent chromium and most common interfering ions when properly buffered and masked. The instrument integrates sample conditioning, reagent dosing, reaction incubation, optical measurement, and data reporting into a single robust platform, delivering high reproducibility and long-term stability required for regulatory compliance and process control in water and wastewater treatment facilities.
Key Features
- Low reagent consumption: Designed for extended operation—reagents require replacement only once per month under typical deployment conditions, minimizing operational overhead and chemical handling frequency.
- Minimal waste generation: Produces only ~1.1 L of waste liquid per month, significantly reducing disposal costs and environmental footprint compared to conventional benchtop or older online analyzers.
- Automated calibration and verification: Supports scheduled zero/span calibration using certified standard solutions; includes built-in validation checks to confirm photometric integrity and fluidic path performance prior to each measurement cycle.
- Self-cleaning filtration system: Equipped with an automatic backflushing particulate filter that activates after every analysis cycle, preventing clogging and maintaining consistent sample integrity without manual intervention.
- Dual-range adaptive measurement: Automatically selects between high- and low-concentration ranges (e.g., 0–100 µg/L and 0–1000 µg/L), including on-board dilution capability for samples exceeding the upper detection limit—ensuring accuracy across diverse influent and effluent profiles.
- Intuitive human-machine interface: Features a 5.7-inch color TFT touchscreen with multilevel menu navigation, real-time trend visualization, alarm status indicators, and configurable data logging intervals.
Sample Compatibility & Compliance
The HMA-CR6 is validated for direct analysis of raw and treated surface water, municipal wastewater influent/effluent, and industrial discharges—including electroplating, metal finishing, and pigment manufacturing effluents. It meets key regulatory method equivalency requirements for Cr(VI) monitoring under U.S. EPA Method 7196A and China’s HJ 636-2012. Its architecture supports GLP-compliant operation through audit-trail-enabled software (via optional HACH SC1000 or DataStream integration), including timestamped calibration records, maintenance logs, and user-access controls aligned with FDA 21 CFR Part 11 principles where configured with appropriate IT infrastructure.
Software & Data Management
Data acquisition and system control are managed via embedded firmware compliant with Modbus RTU/TCP and 4–20 mA analog output protocols, enabling seamless integration into SCADA, DCS, or LIMS environments. Optional connectivity to HACH’s DataStream cloud platform allows remote configuration, real-time diagnostics, predictive maintenance alerts, and secure export of CSV/Excel-formatted reports. All measurement events—including raw absorbance values, calculated concentrations, calibration history, and error flags—are time-stamped and stored locally for ≥90 days, supporting traceability for internal QA/QC audits and external regulatory reviews.
Applications
- Continuous compliance monitoring at wastewater treatment plant discharge points subject to NPDES or local Cr(VI) permit limits.
- Process control in electroplating and anodizing facilities to verify rinse water quality and minimize hazardous waste generation.
- Early-warning detection in drinking water source protection zones impacted by industrial runoff or legacy contamination.
- Long-term trend analysis for environmental remediation projects involving chromium-contaminated sediments or groundwater plumes.
- Support for ISO 14001-certified environmental management systems requiring documented, automated analytical verification of effluent parameters.
FAQ
What is the detection range of the HMA-CR6?
The analyzer supports dual-range operation: typically 0–100 µg/L and 0–1000 µg/L, with automatic dilution for out-of-range samples.
Does the HMA-CR6 require daily maintenance?
No—routine maintenance is limited to monthly reagent replacement and quarterly filter inspection; automated backflushing eliminates daily manual cleaning.
Is the HMA-CR6 compliant with U.S. EPA methods?
Yes—it implements the chemistry and optical principles of EPA Method 7196A and demonstrates method equivalency when operated per manufacturer specifications.
Can the HMA-CR6 be integrated into existing plant automation systems?
Yes—standard Modbus RTU/TCP and 4–20 mA outputs enable direct integration with PLCs, DCS, or SCADA platforms without proprietary gateways.
How does the instrument handle turbid or particulate-laden samples?
The integrated auto-backflushing filter removes suspended solids prior to analysis; optional pre-filtration or ultrasonic sample homogenization modules are available for highly variable influents.
