HJ ZRQF-F30J Intelligent Hot-Sphere Anemometer

Overview

The HJ ZRQF-F30J Intelligent Hot-Sphere Anemometer is a portable, microprocessor-controlled thermal anemometer engineered for precise low-velocity air flow measurement in confined or regulated environments. It operates on the principle of constant-temperature anemometry (CTA), where a heated spherical sensor element experiences convective cooling proportional to local air velocity. This method enables stable, responsive measurements across its full dynamic range — from gentle drafts (0.05 m/s) up to moderate ventilation flows (30.0 m/s). Unlike cup or vane anemometers, the hot-sphere design offers minimal flow disturbance and rapid thermal response, making it suitable for laminar and transitional flow regimes typical in HVAC ductwork, cleanroom monitoring, laboratory fume hoods, and environmental chamber validation. Integrated temperature and relative humidity sensing allows simultaneous multi-parameter acquisition — critical for calculating volumetric flow, correcting density-dependent readings, and assessing thermal comfort per ISO 7730 or ASHRAE Standard 55.

Key Features

• Hot-sphere thermal sensor with 0.01 m/s resolution and dual-range accuracy specification compliant with ISO 16813 and ASTM D1078 for low-velocity airflow instrumentation
• Simultaneous real-time measurement of air velocity (U), ambient temperature (T), and relative humidity (RH) — all displayed concurrently on a backlit LCD screen
• Two operational modes: Instant Read (continuous sampling at 1 Hz) and Time-Averaged Mode (user-selectable averaging intervals: 1, 3, 5, or 10 minutes)
• Rugged, handheld ergonomic housing (187 × 84 × 46 mm) with IP52-rated ingress protection against dust and dripping water
• Detachable probe assembly featuring a 620 mm stainless-steel measuring rod (Φ11 mm) and 3 m shielded coaxial cable for flexible positioning in ducts or behind grilles
• Battery-powered operation (4 × AA, 6 V DC) supporting >20 hours of continuous use; low-battery indicator and auto-power-off after 10 minutes of inactivity

Sample Compatibility & Compliance

The ZRQF-F30J is validated for use in non-corrosive, particle-free airstreams with temperature between 0 °C and 40 °C and relative humidity below 90% RH (non-condensing). It is not rated for explosive atmospheres, high particulate loading (>1 mg/m³), or chemically aggressive gases (e.g., chlorine, ammonia, or solvent vapors). The instrument meets general requirements for portable environmental monitors under IEC 61000-6-3 (EMC emission standard) and IEC 61000-6-2 (immunity). While not certified to GLP or GMP Annex 1 standards out-of-the-box, its traceable calibration procedure (per ISO/IEC 17025–accredited labs) and documented uncertainty budget support integration into quality systems requiring audit-ready documentation for HVAC commissioning, ISO 14644-3 cleanroom testing, or OSHA indoor air quality assessments.

Software & Data Management

The ZRQF-F30J operates as a standalone field instrument without proprietary software dependency. All measured data — including timestamped U/T/RH triplets — are retained in internal memory (up to 999 records) and can be manually reviewed via scroll navigation. For traceable reporting, users may export logged values using optional RS232-to-USB adapters (not included) and third-party terminal emulators (e.g., Tera Term, PuTTY) configured for 9600 bps, 8N1 protocol. Raw ASCII output supports direct import into Excel, MATLAB, or LIMS platforms. Audit trail integrity is maintained through immutable timestamping and absence of editable configuration files — consistent with basic ALCOA+ principles for field-deployed instruments used in environmental compliance workflows.

Applications

• HVAC system balancing and duct traverse surveys per ASHRAE Guideline 12 and ISO 12599
• Cleanroom airflow uniformity and velocity mapping in ISO Class 5–8 environments (e.g., pharmaceutical filling lines, semiconductor fabrication tool enclosures)
• Occupational hygiene assessments of local exhaust ventilation (LEV) capture velocity at hood faces (HSE HSG258)
• Agricultural storage ventilation monitoring (grain silos, cold rooms) and greenhouse climate profiling
• Educational fluid mechanics labs for boundary layer studies and fan performance characterization
• Post-construction indoor air quality (IAQ) verification, including thermal comfort evaluation (PMV/PPD indices)

FAQ

Is the ZRQF-F30J suitable for calibration against NIST-traceable standards?
Yes — the hot-sphere sensor and thermistor/hygrometer elements can be calibrated individually by accredited laboratories using wind tunnel reference standards (e.g., ISO 17025-accredited facilities offering ISO/IEC 17025 calibration certificates).
Can this anemometer measure air velocity in high-temperature ducts?
No — the specified operating temperature range is strictly 0–40 °C. Prolonged exposure above 40 °C may cause sensor drift or permanent damage to the polymer-housed electronics.
Does the instrument support data logging with time stamps?
Yes — internal memory stores up to 999 sets of U/T/RH values with automatic time stamping (real-time clock synchronized at power-on). No external software is required to retrieve stored data.
What is the recommended recalibration interval?
Annual recalibration is advised for routine QA/QC use. In high-use or critical applications (e.g., ISO 14644 certification), semi-annual verification against a reference anemometer is recommended.
Is the probe compatible with extension rods or custom mounting fixtures?
The 620 mm rigid probe features a standardized 1/4″-20 threaded base, enabling mechanical coupling to tripod adapters, magnetic mounts, or telescoping poles commonly used in industrial hygiene sampling.