Shenchanghong LTURB-3B Precision Turbidimeter

Overview

The Shenchanghong LTURB-3B Precision Turbidimeter is a benchtop optical instrument engineered for reliable, repeatable turbidity quantification in laboratory and quality control environments. It operates on the principle of nephelometry—measuring the intensity of light scattered at 90° from a collimated incident beam—as defined in ISO 7027-1:2016 and aligned with EPA Method 180.1 and Standard Methods 2130 B. The instrument employs a high-stability, long-life (100,000-hour rated) imported LED source coupled with a narrow-band interference filter system to minimize spectral drift and ambient light interference. This optical architecture ensures consistent beam geometry and signal-to-noise ratio across the full 0–1000 NTU range, supporting both low-turbidity water analysis (e.g., drinking water compliance) and higher-range industrial effluent monitoring.

Key Features

• Optical design compliant with ISO 7027-1:2016 for formazin-based turbidity calibration traceability
• Nephelometric detection at 90° scattering angle with integrated temperature-compensated photodetector
• High-resolution 0.1 NTU readout with ≤ ±2 % full-scale accuracy and repeatability
• Low thermal drift: < 0.1 NTU/h after 30-minute warm-up period
• Backlit LCD display with intuitive Chinese-language menu navigation—no external PC required for routine operation
• Onboard non-volatile memory stores up to 10 user-defined calibration curves and 500 timestamped measurement records
• Durable molded ABS housing resistant to common laboratory reagents and humidity exposure (≤70 % RH)
• Low-power 16-bit microcontroller architecture enabling stable real-time signal processing and power efficiency

Sample Compatibility & Compliance

The LTURB-3B accepts standard 25-mm round glass or quartz cuvettes (10-mm path length), compatible with ASTM D6508-22 and ISO 7027-1 reference standards. It supports direct measurement of clear to highly turbid aqueous samples—including potable water, wastewater, pharmaceutical process streams, and beverage formulations—without dilution up to 1000 NTU. For regulatory applications, the instrument’s fixed optical path and stable LED source facilitate alignment with GLP documentation requirements. While not FDA 21 CFR Part 11–certified out-of-the-box, its audit-ready data logging (with persistent timestamps and curve identifiers) supports internal validation protocols under ISO/IEC 17025 and GMP Annex 11 frameworks.

Software & Data Management

No proprietary software installation is required for basic operation; all calibration, measurement, and data recall functions are executed via the embedded interface. Calibration may be performed using certified formazin or polymer standards (e.g., StablCal®), with linear or multi-point curve fitting options. Stored data—including date/time stamps, sample IDs, calibration references, and measured NTU values—remain retained during power loss due to EEPROM-backed memory. Export functionality is limited to manual transcription; however, the device’s deterministic output format (NTU value + metadata flags) enables seamless integration into LIMS via serial capture or barcode-assisted entry workflows.

Applications

• Drinking water treatment: verification of filtration efficiency and post-disinfection clarity per WHO Guidelines and EU Directive 98/83/EC
• Pharmaceutical manufacturing: USP particulate matter testing support for injectables and ophthalmic solutions
• Food & beverage QC: consistency monitoring of juices, dairy emulsions, and brewing wort clarity
• Environmental labs: EPA-compliant wastewater discharge reporting and surface water quality assessment
• Educational laboratories: teaching core principles of light scattering, Beer–Lambert deviations, and instrumental calibration uncertainty

FAQ

What calibration standards are recommended for routine use?
Formazin suspension (primary standard per ISO 7027-1) or NIST-traceable polymer standards (e.g., StablCal®) are recommended. Calibration should be verified daily when used for regulatory reporting.
Is the LTURB-3B suitable for measuring colored samples?
Yes—the narrow-band optical system minimizes absorbance interference; however, highly absorptive samples (>0.5 AU at 860 nm) may require compensation per ISO 7027-1 Annex B.
Does the instrument support automatic temperature compensation?
No—temperature compensation is not applied algorithmically, but the optical system is thermally stabilized to limit drift within 5–40 °C ambient operating range.
Can measurement data be exported electronically?
Not natively via USB or Bluetooth; data must be manually recorded or captured via RS-232 interface using third-party terminal software.
What is the warm-up time before achieving specified accuracy?
30 minutes of continuous operation is required to reach thermal equilibrium and meet ≤ ±2 % FS accuracy specification.