Tianhong TH-W800 Portable Flow-Proportional Water Sampler
| Brand | Tianhong |
|---|---|
| Origin | Hubei, China |
| Model | TH-W800 |
| Instrument Type | Portable Automatic Water Sampler |
| Sampling Method | Exceedance-Based Retention Sampling |
| Single Sample Volume | 10–1000 mL |
| Sampling Volume Accuracy | ±5% |
| Bottle Capacity | 1–24 Vials |
| Communication Interface | RS-232 |
| Remote Control | GPRS-enabled with Centralized Monitoring Platform |
| Power Failure Recovery | Yes (non-volatile parameter retention) |
| Data Notification | SMS alert capability |
Overview
The Tianhong TH-W800 Portable Flow-Proportional Water Sampler is an automated, field-deployable environmental sampling instrument engineered for regulatory-compliant collection and cold preservation of aqueous samples from surface water bodies, wastewater treatment process streams, and industrial discharge points. It operates on programmable proportional sampling principles—primarily time-proportional, flow-proportional, level-proportional, and exceedance-triggered modes—enabling representative composite or discrete sample acquisition under dynamic hydraulic conditions. Designed for unattended operation in remote or semi-permanent monitoring stations, the TH-W800 integrates refrigerated sample storage (4–8 °C), precise volumetric dispensing, and event-driven logic to support compliance with national and provincial water quality surveillance protocols in China, including HJ 353–2019 (Technical Specification for Installation and Acceptance of Online Monitoring Systems for Pollutant Sources) and HJ 354–2019 (Technical Specification for Operation and Maintenance of Online Monitoring Systems for Pollutant Sources). Its portable architecture facilitates rapid deployment at municipal sewer outfalls, pump stations, and river cross-sections without requiring permanent infrastructure.
Key Features
- Programmable multi-mode sampling: Supports time-based, flow-proportional, level-proportional, synchronous retention (coordinated with online analyzers), exceedance-triggered retention, external relay control, remote command initiation, and scheduled supply mode (e.g., delivering homogenized composite samples to continuous water quality analyzers).
- Configurable vial-based retention: Accommodates 1–24 individual sample vials; vial count and sequence are user-definable via onboard interface or remote platform.
- Cold chain integrity: Integrated thermoelectric cooling maintains sample temperature between 4 °C and 8 °C throughout sampling campaigns, minimizing biological activity and chemical degradation during interim storage.
- Robust data logging: Records timestamp, sample volume, trigger mode, vial position, door open/close events, and system status for each sampling event—stored internally with non-volatile memory.
- GPRS-enabled telemetry: Embedded cellular module supports secure bidirectional communication with centralized SCADA or cloud-based environmental monitoring platforms; enables real-time parameter reconfiguration, manual sample triggering, and firmware updates over-the-air.
- Fault-resilient operation: Equipped with power-loss recovery logic; all operational parameters, sampling schedules, and historical logs persist across unexpected mains interruption and subsequent reboot.
Sample Compatibility & Compliance
The TH-W800 is validated for use with aqueous matrices including raw sewage, treated effluent, surface runoff, and natural freshwater systems. It complies with Chinese environmental standards HJ 353–2019 and HJ 354–2019 for integration into legally mandated pollutant source monitoring networks. While not certified to ISO/IEC 17025 or EPA Method 1664B per se, its ±5% volumetric accuracy aligns with typical field-sampling tolerances specified in GB/T 14581–2022 (Water Quality Sampling Technical Guidelines) for composite sampling applications. The instrument’s RS-232 interface supports Modbus RTU protocol for interoperability with common online COD, NH₃-N, TP, and turbidity analyzers. All internal wetted components are chemically inert (food-grade PP and PTFE-lined tubing), ensuring minimal leaching or adsorption for trace-level analyte preservation.
Software & Data Management
The TH-W800 interfaces with Tianhong’s proprietary web-based Environmental Monitoring Platform (EMP), accessible via HTTPS-secured browser session. EMP provides role-based access control, audit-trail logging (per GLP-aligned requirements), and export of CSV/Excel-formatted sampling records—including timestamps, volumes, trigger sources, vial IDs, and ambient temperature/humidity metadata. Remote configuration changes are digitally signed and timestamped to satisfy basic data integrity requirements under China’s Cybersecurity Law and Measures for the Administration of Environmental Monitoring Data. Optional SMS notification service delivers critical alerts (e.g., door opening, low battery, sampling failure, exceedance event) directly to designated mobile numbers—bypassing network dependency where cellular coverage exists but internet connectivity is unreliable.
Applications
- Regulatory compliance monitoring at municipal wastewater treatment plant (WWTP) final discharge points.
- Industrial effluent auditing at enterprise-level total discharge outlets, particularly for enterprises subject to key pollutant discharge permits.
- Dynamic process monitoring within activated sludge or membrane bioreactor (MBR) treatment lines to capture diurnal or load-dependent variations.
- Surface water quality assessment at riverine cross-sections where flow rate fluctuates significantly (e.g., seasonal streams, tidal estuaries).
- Calibration verification support for online water quality analyzers via synchronized composite sample provision.
FAQ
What sampling modes does the TH-W800 support?
Time-proportional, flow-proportional, level-proportional, synchronous retention (with compatible online analyzers), exceedance-triggered retention, external relay control, remote manual initiation, and scheduled composite supply mode.
Is the instrument suitable for long-term unattended deployment?
Yes—it features GPRS telemetry, non-volatile memory, power-failure recovery, and refrigerated storage, enabling continuous operation for up to 30 days depending on battery configuration and sampling frequency.
Does it meet international calibration or certification standards?
The TH-W800 conforms to Chinese national technical specifications (HJ 353–2019, HJ 354–2019, GB/T 14581–2022); it is not CE-marked, UL-listed, or EPA-certified for U.S. or EU regulatory use.
Can sampling parameters be modified remotely without physical access?
Yes—via the web-based EMP platform or SMS command set, including schedule adjustments, vial mapping, temperature setpoints, and trigger thresholds.
What is the maximum allowable suspended solids concentration for reliable operation?
The system is rated for influent with ≤ 200 mg/L total suspended solids (TSS); higher concentrations may require optional pre-filtration or periodic maintenance of the peristaltic pump tubing and sample probe.
