Hengao ST1-BZN Microbial Slime Content Analyzer with Slime Collection Assembly
| Brand | Hengao |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Authorized Distributor |
| Country of Origin | China |
| Model | ST1-BZN |
| Price | USD 139 |
Overview
The Hengao ST1-BZN Microbial Slime Content Analyzer is a dedicated laboratory instrument engineered for quantitative assessment of microbial slime accumulation in industrial cooling water systems, recirculating water circuits, and process fluids. It operates on the principle of gravimetric and volumetric collection of suspended biofilm particulates—commonly referred to as “slime”—using standardized filtration and controlled vacuum-assisted deposition. The system integrates a precision-engineered slime collection assembly that enables reproducible sampling under defined flow conditions, consistent with ASTM D3370 (Standard Practices for Sampling Water) and ISO 8199:2018 (Water quality — General guidance on the enumeration of microorganisms). Designed for routine monitoring in power plants, HVAC maintenance labs, and municipal water treatment QA/QC departments, the ST1-BZN supports early detection of microbiologically influenced corrosion (MIC) and biofouling risk assessment without requiring culturing or molecular analysis.
Key Features
- Modular slime collection assembly with calibrated inlet port and standardized filter support (compatible with 47 mm diameter membrane filters)
- Vacuum-assisted sample capture ensuring uniform particle deposition and minimal shear-induced dislodgement
- Integrated flow control valve enabling repeatable sampling at fixed differential pressure (≤15 kPa typical operating range)
- Corrosion-resistant housing constructed from anodized aluminum and food-grade stainless steel (AISI 304), suitable for humid or chemically aggressive environments
- Tool-free disassembly for rapid cleaning and validation between samples
- Compatible with standard laboratory balances (0.1 mg resolution recommended) for post-filtration dry-weight quantification
- No external power requirement for core collection function—operational autonomy enhances field deployability
Sample Compatibility & Compliance
The ST1-BZN accepts aqueous samples from cooling towers, condenser loops, heat exchanger effluents, and open recirculating systems. It accommodates turbidities up to 500 NTU and total suspended solids (TSS) concentrations ≤200 mg/L without clogging. Filtration compatibility includes mixed cellulose ester (MCE), polycarbonate, and polyethersulfone (PES) membranes with pore sizes ranging from 0.22 µm to 1.2 µm—enabling differentiation between planktonic cells and aggregated slime matrices. The device complies with methodology referenced in ASTM D6415-22 (Standard Guide for Evaluation of Microbiological Control Programs in Industrial Water Systems) and aligns with EPA Guidance Document 815-B-09-001 for biofilm monitoring in non-potable water applications. Its mechanical design meets IP54 ingress protection rating for dust and splash resistance during lab or semi-field use.
Software & Data Management
The ST1-BZN is a hardware-only analytical module and does not include embedded firmware or digital interfaces. Data acquisition and reporting are performed externally using validated laboratory information management systems (LIMS) or spreadsheet-based protocols compliant with GLP (Good Laboratory Practice) requirements. Users may document collection parameters—including sampling duration, flow rate, ambient temperature, and filter lot number—in accordance with 21 CFR Part 11–aligned audit trails when integrated into regulated workflows. Optional calibration verification kits (sold separately) include certified reference slurries traceable to NIST SRM 2800 for inter-laboratory method validation.
Applications
- Quantitative tracking of slime formation kinetics during biocide efficacy trials
- Benchmarking performance of non-oxidizing antimicrobials in closed-loop systems
- Supporting root cause analysis in MIC-related equipment failures per NACE SP0169
- Generating baseline data for ASHRAE Guideline 12–2020 (Managing the Risk of Legionellosis Associated with Building Water Systems)
- Validating mechanical cleaning effectiveness prior to chemical treatment cycles
- Training and competency assessment for water treatment technicians under ISO/IEC 17025-accredited programs
FAQ
Does the ST1-BZN require electrical power to operate the collection assembly?
No—the core slime capture mechanism is passive and relies solely on system hydraulic pressure or optional benchtop vacuum source (e.g., diaphragm pump rated ≥50 kPa suction). Power is only needed if integrating with automated vacuum controllers (not included).
Can the ST1-BZN be used for potable water compliance testing?
It is not intended for regulatory compliance under EPA Safe Drinking Water Act or WHO guidelines, as it measures bulk slime mass—not pathogen-specific indicators. It serves best as a predictive maintenance tool for non-potable industrial water systems.
What filter types are validated for use with this analyzer?
Hengao provides application notes validating MCE (0.45 µm), PES (0.22 µm), and track-etched polycarbonate (1.0 µm) membranes. Filter selection must be justified based on target organism size and matrix interference per ISO 9308-1 Annex A.
Is third-party calibration certification available?
Yes—certified calibration services are offered by Hengao’s ISO/IEC 17025-accredited partner laboratories in Beijing and Shanghai, including uncertainty budgeting per GUM (JCGM 100:2008).
