Hach TL2300 Benchtop Turbidimeter

Overview

The Hach TL2300 Benchtop Turbidimeter is a high-precision, ISO 7027- and USEPA Method 180.1-compliant optical instrument engineered for reliable, traceable turbidity measurement in regulated laboratory environments. It employs the nephelometric principle—measuring scattered light at 90° to the incident beam—using an 860 ± 30 nm LED source to ensure compliance with international standards for particulate suspension quantification. Designed as part of Hach’s next-generation TL23 series, the TL2300 integrates five decades of turbidity metrology expertise with modern digital architecture, delivering consistent performance across water quality testing, pharmaceutical process monitoring, environmental compliance, and beverage QC applications. Its robust optical path design minimizes stray light interference, while temperature-stabilized detection electronics maintain signal integrity across the full operating range (0–40 °C). Unlike portable or process variants, the TL2300 is optimized for controlled benchtop use, supporting rigorous method validation and long-term calibration stability required under GLP and GMP frameworks.

Key Features

• 7-inch full-color capacitive touchscreen interface with intuitive navigation, aligned with Hach’s standardized spectrophotometer UI for seamless cross-platform operator training and reduced learning curve.
• Intelligent endpoint detection algorithm that dynamically assesses signal stability—only displaying final readings once variance falls below 1% or 0.01 NTU over successive measurements—eliminating subjective visual interpretation and minimizing human-induced variability.
• Dual USB-A ports enabling direct connection to external peripherals including USB flash drives (for CSV report export), thermal printers (for audit-ready hard copies), keyboards, and 2D barcode scanners—facilitating sample ID automation and chain-of-custody documentation.
• Onboard data storage for up to 2,000 records, including raw turbidity values, calibration history (date, standard used, slope/intercept), and verification results—fully timestamped and user-annotated for regulatory traceability.
• High-resolution detection capability with 0.001 NTU resolution at low-range measurements (0–10 NTU), ensuring sensitivity for ultrapure water analysis and low-turbidity pharmaceutical rinse validation.
• Comprehensive readout modes: single-shot, continuous monitoring, Rapid Settling Time (RST) mode for suspensions undergoing flocculation, signal averaging (10-point mean), and ratio mode for dual-wavelength correction where applicable.

Sample Compatibility & Compliance

The TL2300 accepts standard 95 × 25 mm (3.74 × 1 in) round borosilicate glass cuvettes with rubber-sealed caps—designed for optimal optical clarity, thermal resistance, and mechanical durability. Optional cuvette adapters enable use of smaller diameter cells (e.g., 16 mm or 12.5 mm), accommodating limited sample volumes down to 20 mL. Sample temperature tolerance extends from 0–70 °C, though instrument operation is specified within 0–40 °C ambient conditions to preserve detector linearity and LED spectral consistency. The instrument meets CE and RoHS directives and carries CMC certification for metrological traceability in China. Its turbidity measurement protocol conforms to ISO 7027:2016, DIN EN ISO 7027, DIN 38404-2, NFT 90-33, and USEPA Method 180.1—ensuring data acceptability in EPA-regulated reporting, EU Drinking Water Directive compliance, and WHO guideline implementation.

Software & Data Management

Data generated by the TL2300 supports full 21 CFR Part 11 readiness when integrated with Hach’s optional Liquid Analysis Software Suite, which provides electronic signatures, role-based access control, and immutable audit trails for calibration edits, method changes, and result overrides. All exported reports include embedded metadata: instrument serial number, firmware version, operator ID, date/time stamp, calibration standard lot number, and uncertainty estimates per ISO/IEC 17025 guidance. USB-exported files are structured as UTF-8 encoded CSVs with column headers compliant with LIMS ingestion protocols (e.g., ASTM E1469). Internal memory retains full calibration logs—including zero and span checks—with automatic flagging of out-of-specification events. No cloud connectivity or proprietary drivers are required; native USB mass-storage mode ensures plug-and-play compatibility with Windows, macOS, and Linux systems.

Applications

• Drinking water & wastewater laboratories: Routine compliance testing per EPA 180.1 and ISO 7027, including finished water release verification, filter effluent monitoring, and sludge dewatering optimization.
• Pharmaceutical manufacturing: USP General Chapter <730> turbidity assessment of injectables, rinse water qualification (PW/WFI), and bioburden indicator suspension characterization.
• Food & beverage QA: Beer clarity (EBC units), juice sedimentation profiling, dairy processing stream consistency, and bottled water purity validation.
• Environmental research: Sediment transport modeling, algal bloom quantification, and wetland restoration efficacy tracking using field-collected samples analyzed under controlled lab conditions.
• Academic & method development labs: Reference instrument for validating new turbidimetric assays, inter-laboratory comparison studies, and sensor cross-calibration against primary standards.

FAQ

What standards does the TL2300 comply with for regulatory reporting?
The TL2300 is validated for USEPA Method 180.1 and ISO 7027:2016, with documented traceability to NIST-traceable Formazin and AMCO AEPA standards. Its optical design and firmware algorithms meet requirements for data submission to U.S. state primacy agencies and EU national authorities.

Can the TL2300 measure beyond 4000 NTU without dilution?
While the primary range is 0–4000 NTU (±2% + 0.01 NTU up to 1000 NTU; ±5% above), the instrument supports extended-range measurement up to 10,000 NTU on select models (e.g., TL2350/TL2360). For TL2300 users requiring higher concentrations, manual dilution with certified low-turbidity water and subsequent calculation is recommended per ISO 7027 Annex B.

Is firmware update capability available in the field?
Yes—firmware updates are delivered via USB drive and installed through the Settings menu. Each release includes version-controlled changelogs, impact assessments for metrological parameters, and rollback support. Updates do not require factory service or recalibration.

How is calibration verification performed between scheduled intervals?
The instrument supports daily verification using a stable secondary standard (e.g., StablCal®). Results are logged automatically and compared against acceptance criteria defined in your SOP. Deviations trigger configurable alerts and prevent further measurements until corrective action is documented.