Timepower TP205 Precision Chilled-Mirror Dew Point Meter
| Brand | Timepower |
|---|---|
| Origin | Beijing, China |
| Manufacturer Type | Direct Manufacturer |
| Product Category | Laboratory-Grade Dew Point Meter |
| Model | TP205 |
| Measurement Principle | Chilled-Mirror Hygrometry |
| Operating Temperature | 5–60 °C |
| Accuracy | ±2 °C |
| Repeatability | ±0.2 °C |
| Dew Point Range | −100 to 0 °C (low-range sensor) or −60 to +20 °C (standard sensor) |
| Resolution | 0.01 °C (dew point) |
| Response Time (63% / 90%) | 90 s / 450 s |
| Gas Flow Rate | 0.1–0.4 L/min (H₂), 0.5–0.9 L/min (SF₆) |
| Pressure Measurement Range | 0–1 MPa |
| Sample Pressure Range | 0–10 bar |
| Probe Protection | Stainless Steel Sintered Filter |
| Storage Temperature | −40 to +70 °C |
| Relative Humidity Range | 0–100 %RH |
| Power Supply | AC 220 V / 50 Hz or DC 11.1 V Li-ion battery (auto-switching, overcharge/over-discharge protection) |
| Dimensions | 310 × 290 × 280 mm |
| Weight | 4.6 kg |
| Data Interface | RS232 / RS485 (optional) |
| Display | Full-color TFT touch screen |
| Data Logging | Internal digital storage with real-time timestamping |
| Battery Status | Digital charge-level indicator |
Overview
The Timepower TP205 Precision Chilled-Mirror Dew Point Meter is a laboratory-grade hygrometer engineered for trace moisture analysis in dry industrial gases. It operates on the fundamental principle of chilled-mirror condensation hygrometry: a thermoelectrically cooled mirror surface is precisely regulated until dew forms under controlled gas flow; optical detection of condensate onset—combined with high-stability platinum resistance thermometry—enables direct, primary-standard measurement of dew point temperature. This method delivers intrinsic accuracy and long-term traceability without reliance on polymer-based sensors or empirical calibration curves. The TP205 integrates a Vaisala-certified chilled-mirror sensor module, gain-regression algorithms, and zero-point auto-calibration routines—technologies validated for stability in low-humidity environments (<1 ppmv H₂O) and chemically aggressive matrices including SF₆, H₂, CO₂, Ar, N₂, O₂, and compressed air. Its design meets core metrological requirements for ISO/IEC 17025-compliant laboratories and supports GLP/GMP documentation workflows.
Key Features
- Chilled-mirror measurement core with Vaisala-sourced optical condensation detection and Pt100 mirror temperature sensing
- Auto-zero calibration sequence that compensates for thermal drift and mirror contamination effects during operation
- Stainless steel sintered filter probe assembly for particulate and aerosol protection in field-deployed applications
- Full-color 7-inch TFT capacitive touch display with intuitive GUI, real-time trend visualization, and multilingual interface support
- Onboard non-volatile memory storing >100,000 timestamped dew point readings with metadata (gas type, pressure, flow rate, operator ID)
- Dual power architecture: seamless switching between 11.1 V Li-ion battery (≥8 h continuous operation) and 220 V AC mains, featuring integrated overvoltage, overcurrent, and thermal cutoff protection
- Configurable analog/digital output options: RS232 and RS485 interfaces compliant with Modbus RTU protocol for SCADA integration
Sample Compatibility & Compliance
The TP205 is validated for use with non-corrosive and mildly reactive dry gases—including hydrogen (H₂), sulfur hexafluoride (SF₆), nitrogen (N₂), oxygen (O₂), argon (Ar), carbon dioxide (CO₂), and instrument-grade compressed air. It complies with IEC 61000-6-2 (immunity) and IEC 61000-6-4 (emissions) for electromagnetic compatibility. While not intrinsically safe, its enclosure meets IP54 ingress protection standards. The system supports audit-ready data integrity per FDA 21 CFR Part 11 when paired with Timepower’s optional secure logging software—featuring electronic signatures, user access levels, and immutable event logs. Calibration certificates are traceable to NIM (National Institute of Metrology, China) standards, with optional UKAS-accredited calibration available upon request.
Software & Data Management
Data acquisition and reporting are managed via Timepower’s DewTrack™ PC software (Windows 10/11 compatible), which enables remote configuration, firmware updates, batch export to CSV/XLSX, and customizable report generation (PDF/HTML). All stored measurements include embedded environmental context: sample pressure (0–1 MPa), volumetric flow (user-defined range), ambient temperature/humidity, and operator-assigned test IDs. The internal flash memory retains data across power cycles and supports scheduled auto-backup via USB mass storage mode. Firmware version 2.3+ introduces encrypted local storage and configurable data retention policies aligned with ISO 17025 clause 7.5.2.
Applications
- Power industry: SF₆ moisture monitoring in GIS circuit breakers and transformers per IEC 60480 and ASTM D2029
- Electronics manufacturing: Ultra-dry N₂ purge line verification for semiconductor fabrication cleanrooms (ISO 8573-3 Class 1–2)
- Aerospace: Moisture validation of breathing oxygen systems (MIL-STD-810G, DO-160 Section 22)
- Pharmaceutical: Compressed air qualification per USP and EU GMP Annex 1 (dew point ≤ −40 °C for Grade A/B zones)
- Research laboratories: Low-humidity reference standard transfer and inter-laboratory comparison studies
FAQ
What is the lowest measurable dew point with the TP205?
The instrument achieves −100 °C dew point using the optional low-range sensor module; standard configuration covers −60 to +20 °C.
Does the TP205 require regular sensor replacement?
No—chilled-mirror optics and Pt100 thermometry are maintenance-free for ≥5 years under normal operating conditions; only periodic mirror cleaning and filter replacement are recommended.
Can the TP205 measure moisture in corrosive gases such as Cl₂ or NH₃?
Not directly—the standard stainless steel probe is incompatible with strongly oxidizing or alkaline gases; custom Hastelloy or PTFE-wetted path options must be specified at order stage.
Is the device suitable for continuous online monitoring?
Yes—when configured with RS485 Modbus output and external power, it supports unattended 24/7 operation with alarm thresholds and data streaming to DCS/PLC systems.
How is measurement traceability ensured?
Each unit ships with a factory calibration certificate referencing NIM-traceable dew point standards; annual recalibration is recommended per ISO/IEC 17025 Clause 6.6 and manufacturer guidelines.
