PULUODY PLD-11901 Portable Suspended Solids Analyzer

Overview

The PULUODY PLD-11901 Portable Suspended Solids Analyzer is a dedicated gravimetric laboratory instrument engineered for the standardized determination of total suspended solids (TSS) in aqueous environmental samples. It operates in strict accordance with established regulatory methodology—specifically, the principle outlined in ISO 11923:1997 (Water quality — Determination of suspended solids — Gravimetric method) and equivalent national standards including HJ 1147–2020 (China) and EPA Method 160.2. The system integrates a precision vacuum filtration unit, thermally stable heating control, and compatibility with certified analytical balance workflows to deliver repeatable, traceable, and audit-ready TSS measurements. Unlike optical or turbidimetric proxies, the PLD-11901 delivers definitive mass-based quantification by isolating particulate matter via 0.45 µm membrane filtration, followed by controlled drying and high-resolution gravimetric analysis—ensuring full compliance with quality assurance frameworks required in environmental monitoring, wastewater treatment compliance reporting, and regulatory submissions.

Key Features

• Integrated vacuum filtration station with adjustable negative pressure (20–80 kPa), enabling consistent flow rates across variable sample viscosities and particulate loadings.
• High-efficiency diaphragm vacuum pump delivering ≥20 L/min airflow at rated pressure, optimized for rapid filtration without membrane rupture or channeling.
• Thermally stable drying interface compatible with standard laboratory ovens (103–105 °C), supporting ASTM D5907 and ISO 11923-defined gravimetric endpoints.
• Acoustically damped enclosure achieving ≤60 dB(A) operational noise—suitable for shared laboratory environments without acoustic interference.
• Robust mechanical architecture featuring corrosion-resistant stainless-steel filtration manifolds, silicone-sealed filter holders, and ergonomic quick-clamp mechanisms for φ50 mm and φ60 mm membranes.
• Electrical safety certified to IEC 61010-1:2010, with overvoltage category II and pollution degree 2 rating for general laboratory use.

Sample Compatibility & Compliance

The PLD-11901 is validated for use with surface water, groundwater, domestic sewage, and industrial effluents—provided samples are representative, homogenized, and free of floating or submerged non-suspended debris prior to analysis. It supports filtration of sample volumes ranging from 100 mL to 1000 mL, with optimal TSS recovery achieved when residual mass on the membrane falls within the 5–100 mg range—minimizing both moisture retention error and analytical weighing uncertainty. The instrument requires no reagents beyond deionized or distilled water (≥18.2 MΩ·cm resistivity) for membrane pre-wetting and rinsing. All procedural steps—including filter pre-conditioning, sample filtration, triple 10-mL water rinses, and post-filtration drying cycles—align with GLP-aligned documentation practices. Data generated using this system meet evidentiary requirements under ISO/IEC 17025:2017 for testing laboratories and support audit readiness for US EPA NPDES permits, EU Urban Wastewater Treatment Directive reporting, and China’s “Blue Sky & Clear Water” enforcement programs.

Software & Data Management

While the PLD-11901 operates as a hardware-centric gravimetric platform without embedded firmware or digital display, it is fully compatible with modern laboratory information management systems (LIMS) and electronic lab notebooks (ELN). Its procedural workflow integrates seamlessly with digital SOPs, automated balance data capture (via RS232 or USB serial output), and structured metadata logging—including analyst ID, sample ID, filtration time, oven batch number, and balance calibration timestamp. When deployed alongside compliant analytical balances (e.g., METTLER TOLEDO XSR series or SARTORIUS Entris models), the full measurement chain satisfies FDA 21 CFR Part 11 requirements for electronic records and signatures—provided institutional IT validation protocols are applied to connected peripherals and software layers. Audit trails, version-controlled SOPs, and raw weight datasets can be archived in accordance with ISO 17025 clause 7.5.2 and CNAS-CL01:2018 documentation mandates.

Applications

• Regulatory compliance testing for municipal wastewater treatment plants (WWTPs) under national discharge standards.
• Baseline and trend monitoring of suspended solids in riverine, lacustrine, and aquifer recharge zones.
• Process control verification in industrial pretreatment units (e.g., textile dyeing, food processing, metal finishing).
• Field-deployable lab setup for mobile environmental assessment teams conducting rapid-response water quality surveys.
• Educational use in university environmental engineering and analytical chemistry laboratories for method validation training.
• Third-party certification labs performing accredited TSS testing for ISO 14001 environmental management system audits.

FAQ

What filtration membrane specifications are required for compliant operation?
Standardized 0.45 µm pore-size glass fiber filters (e.g., Whatman GF/F or Pall Gelman A/E) in φ50 mm or φ60 mm diameters must be used. Membranes must be pre-combusted (450 °C, 1 h) or supplied pre-cleaned per ISO 11923 Annex A.
Can the PLD-11901 be used for saline or high-TDS water samples?
Yes—provided evaporative salts are removed during the rinsing step and do not contribute to final dry mass. For brackish or seawater, additional deionized water rinses (≥5×) are recommended to minimize residual chloride artifacts.
Is operator training required before first use?
Yes. Users must complete documented competency assessment covering filter handling, vacuum pressure optimization, drying cycle timing, and balance calibration traceability per ISO/IEC 17025 clause 6.2.3.
Does the system include built-in data storage or connectivity?
No. The PLD-11901 is a purpose-built analog instrumentation platform. All data recording and calculation are performed externally using validated spreadsheets or LIMS-integrated balance interfaces.
What maintenance intervals are recommended for long-term reliability?
Vacuum pump oil (if applicable) should be replaced every 500 operating hours; silicone gaskets inspected quarterly; and manifold ports cleaned with ethanol after each high-solids batch to prevent residue buildup.