MKN AVM-05 / AVM-07 Temperature-Anemometer Air Flow Meter

Overview

The MKN AVM-05 and AVM-07 are handheld, multi-parameter environmental monitoring instruments engineered for field-deployable measurement of air velocity, volumetric air flow, and ambient temperature. Designed around a precision vane anemometer sensor with synthetic sapphire jewel bearings, these meters operate on the principle of rotational drag torque conversion—where airflow induces proportional angular displacement of a calibrated impeller, transduced via Hall-effect or optical sensing into a digital velocity signal. The integrated K-type thermocouple enables simultaneous temperature acquisition, supporting thermal comfort assessments, HVAC commissioning, and ventilation system validation. While the AVM-05 serves as a standalone field meter, the AVM-07 extends functionality with an RS-232 interface compliant with EIA/TIA-232-F standards, enabling time-synchronized data logging, remote parameter configuration, and integration into building management systems (BMS) or laboratory QA workflows requiring traceable digital records.

Key Features

• Triple-parameter measurement: real-time air velocity (five selectable units), volumetric flow (CFM/CMM), and temperature (°C/°F toggle)
• Dual-line 4-digit LCD display with dedicated velocity and temperature fields—enabling concurrent readout without mode cycling
• Vane-based airflow sensor with synthetic sapphire jewel bearings for low-friction rotation, extended service life, and resistance to particulate wear
• RS-232 serial interface (AVM-07 only) supporting ASCII protocol at 9600 baud, compatible with Windows/Linux-based data acquisition software and SCADA front-ends
• Auto-ranging velocity measurement across five unit scales (m/s, ft/min, knots, km/h, mph) with consistent ±3% full-scale accuracy and digit-level offset compensation
• Temperature sensing via insulated K-type thermocouple with cold-junction compensation; validated per IEC 60584-1 for industrial thermocouple performance
• Compact ergonomic housing (88 × 168 × 26.2 mm), IP54-rated ingress protection against dust and water splashes during field use
• Low-power design: typical current draw of 3 mA ensures >15 hours of continuous operation on a single 9 V alkaline cell

Sample Compatibility & Compliance

The AVM-05/AVM-07 is intended for non-hazardous, non-corrosive ambient air streams in commercial, industrial, and institutional environments. It is not rated for explosive atmospheres (ATEX/IECEx), high-velocity ducts (>45 m/s), or particulate-laden exhausts exceeding ISO 14644 Class 8 cleanliness. The instrument conforms to EN 61000-6-3 (EMC emission limits) and EN 61000-6-2 (immunity requirements) for portable test equipment. Its temperature and velocity specifications align with ASHRAE Guideline 12–2020 for HVAC system verification and ISO 7726:2009 for ergonomics of thermal environments. While not FDA 21 CFR Part 11–compliant out-of-the-box, the AVM-07’s RS-232 output supports integration with validated third-party data logging platforms that provide audit trails, electronic signatures, and ALCOA+ data integrity controls.

Software & Data Management

The AVM-07 includes a standard RS-232-to-USB adapter and provides ASCII-formatted output at 9600 bps, 8N1, no handshake. Data packets include timestamp (when externally synchronized), velocity (in selected unit), temperature (°C or °F), and status flags (e.g., “AVG”, “MAX”, “HOLD”). Users may configure sampling intervals (1–60 s), averaging modes (instantaneous, 2-point, 3-point max), and unit preferences via terminal commands. Raw output is compatible with Python (pySerial), MATLAB Serial Interface, LabVIEW VISA drivers, and Excel-based parsing tools using comma- or tab-delimited import. For regulated environments, integration with compliant LIMS or ELN systems requires middleware validation to ensure data integrity, metadata capture (operator ID, location tag, calibration expiry), and immutable storage per 21 CFR Part 11 Annex 11 expectations.

Applications

• HVAC system balancing and commissioning per ANSI/ASHRAE Standard 111
• Occupational health & safety assessments of local exhaust ventilation (LEV) hoods and fume cabinets
• Classroom and office thermal environment surveys supporting ISO 7730 PMV/PPD modeling
• Filter efficiency testing via upstream/downstream velocity profiling in cleanrooms
• Validation of laminar flow cabinets and biosafety cabinets per NSF/ANSI 49
• Energy audit workflows measuring supply/return air volumes in rooftop units and AHUs
• Educational laboratory exercises in fluid mechanics and environmental engineering curricula

FAQ

What is the difference between AVM-05 and AVM-07?
The AVM-05 is a self-contained field meter with no external communication capability. The AVM-07 adds an RS-232 interface, enabling bidirectional data transfer, remote triggering, and firmware-upgrade readiness.
Does the device require periodic calibration?
Yes. Annual calibration against NIST-traceable reference standards (e.g., rotating vane calibrator per ISO 17025) is recommended for applications requiring documented metrological traceability.
Can the AVM-07 measure air flow in rectangular ducts?
It does not directly compute duct flow; users must manually input cross-sectional area and apply Q = v × A. The meter reports velocity only—the CMM/CFM values displayed assume user-entered area parameters.
Is the K-type thermocouple replaceable in the field?
No. The thermocouple is permanently integrated into the probe assembly and not designed for end-user replacement; recalibration or factory service is required if thermal drift exceeds ±1.0 °C.
What is the minimum measurable air velocity?
The specified threshold is 0.3 m/s (AVM-05) and 0.6 m/s (AVM-07) under standard conditions (23 °C, 101.3 kPa, <60% RH), reflecting mechanical startup torque limitations of the vane mechanism.