TimePower TP350 Portable Trace Dissolved Oxygen Analyzer
| Brand | TimePower |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | OEM Manufacturer |
| Instrument Type | Portable |
| Measurement Principle | Polarographic Electrochemical Sensor (Clark-type with PTFE/PE Membrane) |
| Measurement Range | 0.0–100 µg/L, 100–1000 µg/L, 1.00–20.00 mg/L (Auto-ranging) |
| Accuracy | ±1.0% FS |
| Repeatability | ≤1% |
| Detection Limit | ±2 ppb (0 µg/L baseline) |
| Response Time (T90) | <5 min at 25 °C |
| Temperature Compensation | Pt1000 sensor, 0–60.0 °C |
| Sample Temp. Range | 5–45 °C |
| Operating Environment | 5–45 °C, ≤90% RH (non-condensing) |
| IP Rating | IP65 |
| Power Supply | AC 85–265 V, 45–65 Hz |
| Power Consumption | ≤1 W |
| Dimensions | 285 × 60 × 255 mm |
| Weight | 2.28 kg |
| Display | 128 × 64 dot-matrix LCD, Chinese interface |
| Data Storage | Cyclic memory with >10-year non-volatile retention |
| Battery Life | Up to 8 hours continuous operation (internal rechargeable battery) |
| Resolution | 0.1 µg/L (0–100 µg/L), 1.0 µg/L (100–1000 µg/L), 0.01 mg/L (1.00–20.00 mg/L) |
Overview
The TimePower TP350 Portable Trace Dissolved Oxygen Analyzer is a field-deployable electrochemical instrument engineered for high-precision quantification of dissolved oxygen (DO) in ultra-low concentration regimes—down to sub-ppb baseline levels. It employs a polarographic (Clark-type) sensor architecture featuring a gas-permeable membrane composed of polytetrafluoroethylene (PTFE) and polyethylene, coupled with a platinum working electrode and a silver/silver chloride or lead reference counter electrode immersed in an aqueous electrolyte. Molecular oxygen diffuses through the semi-permeable membrane and undergoes reduction at the cathode surface, generating a diffusion-limited current linearly proportional to the partial pressure of O₂ in the sample under stabilized temperature and polarization conditions. This principle ensures robust trace-level sensitivity and long-term stability across diverse aqueous matrices—including ultrapure water, boiler feedwater, condensate, pharmaceutical process streams, and low-conductivity environmental samples—where conventional galvanic sensors exhibit drift or insufficient resolution.
Key Features
- Triple-range auto-switching detection: 0.0–100 µg/L (ppb), 100–1000 µg/L, and 1.00–20.00 mg/L (ppm), enabling seamless transition between trace and conventional DO measurement domains.
- High-fidelity signal acquisition: 24-bit analog-to-digital conversion with precision amplification circuitry optimized for low-noise microampere-level current measurement.
- Integrated Pt1000 temperature sensor with automatic compensation across 0–60.0 °C, eliminating manual correction errors during field calibration or in-situ monitoring.
- Ruggedized portable design certified to IP65 ingress protection, supporting reliable operation in humid, dusty, or splash-prone environments typical of power plant turbine halls, pharmaceutical clean utilities, and municipal water treatment facilities.
- Low-power embedded architecture based on industrial-grade microcontroller units (MCUs), delivering up to 8 hours of continuous operation per full charge and >10 years of non-volatile data retention without external backup.
- Intuitive Chinese-language menu system with context-sensitive prompts, reducing operator training burden while maintaining compliance with local usability standards in regulated industrial settings.
Sample Compatibility & Compliance
The TP350 is validated for use with low-conductivity aqueous solutions (≥1 µS/cm recommended) and is routinely deployed in applications governed by ASTM D888 (Standard Test Methods for Dissolved Oxygen in Water), ISO 5814 (Electrochemical probe method), and USP (Oxygen in Water for Pharmaceutical Use). Its polarographic sensor design avoids oxygen consumption artifacts inherent in amperometric alternatives, ensuring minimal perturbation of low-oxygen samples during measurement. The instrument supports GLP-compliant workflows via timestamped data logging and user-accessible calibration history. While not FDA 21 CFR Part 11–certified out-of-the-box, its audit-trail-capable firmware architecture permits configuration within validated computerized systems when integrated into GMP-regulated environments (e.g., biopharmaceutical water-for-injection loop monitoring).
Software & Data Management
Data are stored locally in a circular buffer with automatic overwrite logic upon memory saturation. Each record includes DO concentration, temperature, date/time stamp, and sensor status flags (e.g., membrane integrity warning, polarization time elapsed). Export is supported via USB interface to standard CSV format for post-processing in LIMS or statistical analysis platforms (e.g., JMP, Minitab). Firmware updates are delivered via encrypted binary packages, preserving calibration coefficients and user-defined configurations across revisions. No cloud connectivity or proprietary software installation is required—operation remains fully standalone, aligning with cybersecurity policies in critical infrastructure sectors.
Applications
- Boiler feedwater and condensate monitoring in thermal power generation to prevent oxidative corrosion of economizers and steam drums.
- In-line verification of deaerator efficiency and hydrazine/ammonia dosing control in fossil and nuclear utility cycles.
- Pharmaceutical water system validation (PW, WFI, Pure Steam condensate) per EU Annex 1 and ISPE CGMP guidelines.
- Environmental assessment of hypolimnetic oxygen depletion in stratified reservoirs and wastewater lagoons.
- R&D support for catalyst testing, fuel cell membrane hydration studies, and electrochemical reaction kinetics where sub-10 µg/L resolution is essential.
FAQ
What is the recommended maintenance interval for the DO membrane and electrolyte?
Membrane replacement and electrolyte refill are advised every 3–6 months under continuous operation or after exposure to particulate-laden or organic-contaminated samples. Each replacement requires ≥6-hour polarization and two-point calibration (zero-O₂ and air-saturated water).
Can the TP350 be used with flowing samples outside a flow cell?
Yes—however, optimal accuracy below 50 µg/L requires laminar, bubble-free flow through a dedicated flow-through chamber (optional accessory). Soft tubing (e.g., PVC, silicone) must be avoided due to O₂ permeability; stainless steel or fluoropolymer-lined rigid tubing is recommended.
Does the instrument support temperature correction for non-aqueous solvents?
No—the built-in Pt1000 compensation algorithm and calibration curves are optimized exclusively for aqueous systems. Measurements in organic solvents (e.g., ethanol, glycerol) require independent method validation and external temperature referencing.
Is the TP350 compliant with explosion-proof requirements for hazardous areas?
No—it lacks ATEX, IECEx, or UL Class I Division 2 certification. For use in classified zones, it must be operated outside the hazardous boundary with sample drawn via inert tubing and pressure-regulated bypass.
