TES-1341 Hot-Wire Anemometer with Data Logging

Overview

The TES-1341 Hot-Wire Anemometer is a precision-engineered thermal anemometer designed for reliable, real-time air velocity measurement in HVAC commissioning, indoor air quality (IAQ) assessment, cleanroom validation, and industrial ventilation audits. Based on constant-temperature anemometry (CTA), the instrument employs a fine platinum-coated tungsten wire sensor that maintains a stable temperature differential relative to ambient air. As airflow passes over the heated element, convective cooling alters its resistance — a change linearly correlated to mass flow velocity. This principle enables direct, low-inertia response across a broad dynamic range (0.1–30.0 m/s) without mechanical moving parts, ensuring long-term stability and minimal drift under repeated use. Unlike cup or vane anemometers, the TES-1341 delivers sub-second transient resolution, making it suitable for capturing turbulent fluctuations, duct traverse profiling, and time-series airflow characterization.

Key Features

• High-resolution digital measurement with 0.01 m/s velocity resolution and dual-mode output (instantaneous, average, 2/3-maximum)
• Integrated environmental sensing: simultaneous measurement of air temperature (−20 to +60 °C) and relative humidity (0–100% RH)
• Multi-unit wind speed display: selectable between m/s, ft/min, km/h, knots, and mph — configurable via front-panel menu
• Automatic volumetric flow calculation: supports CFM (cubic feet per minute) and CMM (cubic meters per minute) using user-defined cross-sectional area inputs
• Dual memory architecture: 99-point manual storage directly viewable on LCD + 512 KB internal non-volatile memory (≈20,000 timestamped records)
• USB 2.0 interface with dedicated PC software for data export, time-synchronized graphing, and CSV-compatible reporting
• Programmable auto-power-off (15/30/60 min) and adjustable LED backlight for low-light field operation
• Rugged handheld ergonomics: IP42-rated enclosure, impact-resistant ABS housing, and compact 235 g form factor optimized for one-handed duct access

Sample Compatibility & Compliance

The TES-1341 is validated for use in non-corrosive, particle-free airstreams typical of commercial HVAC systems, laboratory fume hoods, and general-purpose environmental monitoring. It complies with IEC 61000-4-2 (ESD immunity) and meets CE marking requirements for electromagnetic compatibility (EMC Directive 2014/30/EU) and low-voltage safety (LVD Directive 2014/35/EU). While not certified to ISO/IEC 17025 for accredited calibration, its factory calibration traceability aligns with NIST-traceable standards (certificate available upon request). The device supports GLP-compliant workflows through timestamped data logging, user-definable record IDs, and audit-ready export logs — suitable for internal QA documentation and ASHRAE Guideline 12–2020 verification protocols.

Software & Data Management

The included Windows-compatible application (distributed on CD-ROM and downloadable via secure portal) provides full firmware-independent control and post-processing capability. Users may configure logging intervals (1 s to 60 min), define custom duct geometries, apply correction factors for temperature/humidity compensation, and generate annotated trend charts with statistical overlays (min/max/mean/std dev). All logged datasets include embedded metadata: date/time stamp, measurement unit, sensor status flags, and battery voltage. Export formats include .CSV (for Excel or MATLAB ingestion), .PDF summary reports, and .XML for integration into LIMS or CMMS platforms. The software enforces FDA 21 CFR Part 11–compatible electronic signature options when enabled via administrator settings.

Applications

• HVAC system balancing and TAB (Testing, Adjusting, Balancing) per SMACNA and NEBB standards
• Local exhaust ventilation (LEV) hood face velocity surveys per OSHA 1910.145 and HSE HSG258
• Room air distribution mapping in pharmaceutical cleanrooms (ISO 14644-3 Class 5–8)
• Educational aerodynamics labs requiring quantitative boundary layer or jet flow analysis
• Energy audit pre- and post-retrofit airflow verification under ASHRAE Standard 111
• Industrial process air curtain validation and drying oven uniformity testing

FAQ

What calibration standards does the TES-1341 reference?

The sensor is factory-calibrated against NIST-traceable wind tunnel standards at three points (1, 10, and 25 m/s) under controlled temperature and humidity; calibration certificate includes uncertainty budget per ISO/IEC 17025 Annex A.
Can the device measure airflow in high-humidity or condensing environments?

No — prolonged exposure to >90% RH or visible condensation risks sensor contamination and thermal drift; use only in dry or moderately humid airstreams (≤80% RH continuous operation).
Is the USB interface compatible with modern operating systems?

Yes — native drivers support Windows 10/11 (x64), macOS 12+ (via Rosetta 2), and Ubuntu 20.04 LTS+; no additional kernel modules required.
How is measurement accuracy affected by ambient temperature?

The built-in temperature sensor enables automatic compensation; stated ±3% accuracy holds across the full 0–50 °C operating range, verified per ANSI/ASHRAE Standard 111 Annex B test methodology.
Does the memory retain data during battery replacement?

Yes — non-volatile flash memory preserves all stored records and configuration settings indefinitely, even with zero power applied.