Kanomax KA25 Hot-Wire Anemometer

Overview

The Kanomax KA25 Hot-Wire Anemometer is a precision-engineered portable instrument designed for reliable, real-time measurement of air velocity and ambient temperature in HVAC commissioning, indoor air quality (IAQ) assessment, cleanroom validation, and industrial ventilation system audits. Utilizing constant-temperature anemometry (CTA), the KA25 maintains a heated platinum wire sensor at a fixed temperature differential above ambient; airflow-induced cooling is quantified as a proportional electrical current change—enabling high-sensitivity detection across its full 0.01–20.0 m/s range. Unlike cup or vane anemometers, the KA25’s thermal sensing principle delivers near-instantaneous response (<1 s at 90% step response for 1 m/s flow) and exceptional low-velocity resolution (0.01 m/s), making it suitable for laminar flow characterization, duct traverse surveys, and localized airflow verification per ISO 14644-3 and ASHRAE Standard 111.

Key Features

• Hot-wire sensor with extendable and flexible probe (294–1060 mm length, Ø6 mm active tip), enabling access to confined ducts, grilles, and filter banks without disassembly.
• Simultaneous dual-parameter measurement: air velocity and temperature—with direct on-device air volume calculation (m³/h) upon rectangular or circular duct dimension input.
• User-configurable time constant (1 s / 5 s / 10 s / 20 s) to balance dynamic response fidelity against signal noise suppression in turbulent or pulsating flows.
• Integrated statistical engine: real-time display of minimum, maximum, and arithmetic mean values over user-defined sampling intervals—essential for compliance reporting and trend analysis.
• Three-level backlit LCD with intuitive icon-driven interface; supports data hold, auto power-off (3/5/10 min), and battery level indication—optimized for one-handed operation in field conditions.
• Rugged, lightweight housing (220 g,不含 batteries) with IP54-rated probe head and operating range extended to −20 °C to +70 °C—validated for use in cold storage facilities, boiler rooms, and outdoor environmental monitoring stations.

Sample Compatibility & Compliance

The KA25 is calibrated for clean, non-corrosive, particle-free air streams—consistent with ISO 7726 (ergonomics of the thermal environment) and ASTM D5465 (standard test method for determining air velocity using hot-wire anemometers). It is not intended for use in saturated, oily, dusty, or chemically aggressive environments where sensor contamination or drift may occur. The instrument meets CE marking requirements for electromagnetic compatibility (EN 61326-1) and safety (EN 61010-1). While not FDA 21 CFR Part 11–compliant out-of-the-box (lacking audit trail or electronic signature functionality), its measurement traceability aligns with NIST-traceable calibration protocols when serviced by authorized Kanomax service centers—supporting GLP/GMP-aligned validation documentation for pharmaceutical and medical device manufacturing facilities.

Software & Data Management

The KA25 operates as a standalone field instrument with no proprietary PC software dependency. All measurements are processed internally and displayed in real time; no external connectivity (USB, Bluetooth, or Wi-Fi) is provided. Data retention is limited to on-screen hold and statistical buffers—no internal memory or export capability. For integration into digital QA workflows, users may manually transcribe readings into LIMS or Excel-based logbooks. Calibration certificates issued by Kanomax-certified labs include uncertainty budgets compliant with ISO/IEC 17025, facilitating inclusion in laboratory accreditation packages. Firmware updates are not supported—hardware stability and long-term repeatability are prioritized over feature expansion.

Applications

• HVAC system balancing and TAB (Testing, Adjusting, and Balancing) per ASHRAE Guideline 1 and NEBB Procedural Standards.
• Cleanroom airflow uniformity mapping (ISO 14644-3 Annex B), including supply diffuser velocity profiling and unidirectional flow visualization support.
• Industrial exhaust hood face velocity verification (OSHA 1910.145 and ANSI Z9.5).
• Energy audit assessments—including duct leakage estimation via multi-point traverse and volumetric flow reconciliation.
• Educational laboratories for fluid mechanics instruction, emphasizing thermal anemometry fundamentals and transient flow behavior.
• Indoor environmental quality (IEQ) studies measuring thermal comfort parameters per ISO 7730 and ASHRAE 55.

FAQ

What types of duct geometries does the KA25 support for air volume calculation?
The KA25 accepts user-input dimensions for both rectangular (height × width in cm) and circular (diameter in cm) duct cross-sections, automatically computing volumetric flow rate (m³/h) from measured average velocity.
Can the probe be calibrated independently of the main unit?
No—the KA25’s hot-wire probe and electronics are factory-matched as a single calibrated assembly; replacement probes must be ordered as Kanomax OEM part #KA25-PROBE and recalibrated as a system.
Is the KA25 suitable for outdoor wind speed measurement?
It is rated for outdoor use within its specified temperature (−20 to 70 °C) and humidity (2–98% RH) limits, but lacks wind direction sensing or weatherproof enclosure—therefore best deployed under sheltered or semi-enclosed conditions.
How often should the KA25 be recalibrated?
Kanomax recommends annual recalibration for routine QA/QC use; more frequent verification (e.g., pre- and post-survey) is advised when used in critical GxP environments or after mechanical shock or exposure to condensation.
Does the KA25 meet ISO/IEC 17025 requirements for accredited testing?
The instrument itself is not accredited, but measurement results obtained with a properly calibrated and maintained KA25—accompanied by a valid ISO/IEC 17025 calibration certificate—may be cited in accredited test reports when operated under documented SOPs.