Kanomax 6850 Handheld Differential Pressure Meter
| Brand | Kanomax |
|---|---|
| Origin | Liaoning, China |
| Model | 6850+ |
| Pressure Range | −2500 to +2500 Pa |
| Accuracy | ±0.5% of reading ±1 Pa |
| Resolution | 0.1 Pa |
| Velocity Range | 0.20–60.0 m/s |
| Velocity Accuracy | ±1.5% of reading (at 10.0 m/s) |
| Velocity Resolution | 0.01 m/s |
| Flow Rate Range | 0–999999 m³/h |
| Flow Resolution | 1 m³/h |
| Operating Temperature | 0–60 °C (non-condensing) |
| Storage Temperature | −20–70 °C (non-condensing) |
| Power Supply | 4 × AA batteries or DC 5 V adapter |
| Battery Life | >15 hours |
| Weight (with batteries) | ~360 g |
| Display | Full-color LCD |
| Data Storage | 10,000 records with USB export capability |
| Measurement Media | Air and non-corrosive gases |
Overview
The Kanomax 6850 Handheld Differential Pressure Meter is a precision-engineered instrument designed for high-accuracy differential pressure, air velocity, and volumetric flow rate measurements in HVAC commissioning, cleanroom validation, duct system balancing, and laboratory ventilation assessments. Built upon a dual-sensor micro-differential pressure transducer architecture, the device employs piezoresistive sensing technology calibrated against traceable NIST-traceable standards to deliver stable, repeatable readings across its full −2500 to +2500 Pa range. Its real-time calculation engine supports simultaneous display of differential pressure (ΔP), derived velocity (via Pitot tube integration using Bernoulli’s principle), and volumetric flow (Q = A × v), enabling on-site quantification without external computation. The instrument complies with fundamental metrological requirements outlined in ISO/IEC 17025 for field-deployable instrumentation and meets the functional expectations of ASHRAE Guideline 12–2020 for pressure-based airflow verification.
Key Features
- High-resolution differential pressure measurement with 0.1 Pa resolution and ±0.5% of reading ±1 Pa accuracy — optimized for low-pressure applications including filter integrity checks and room-to-room pressure differentials.
- Integrated Pitot tube interface supporting standardized velocity calculations per ISO 16813 and ASHRAE Fundamentals Chapter 42, with automatic compensation for local air density (temperature and atmospheric pressure input optional).
- True-color graphical LCD with multi-parameter overlay: simultaneous real-time display of ΔP, velocity (m/s), and volumetric flow (m³/h) — configurable for single or split-screen view.
- Onboard data logger storing up to 10,000 timestamped records, each containing ΔP, velocity, flow, ambient temperature, and measurement time — compliant with basic GLP documentation requirements.
- USB mass-storage mode enables direct export of CSV-formatted datasets to standard U盘 devices for post-processing in Excel, MATLAB, or validated LIMS environments.
- Rugged handheld form factor (360 g with batteries), IP54-rated enclosure, and extended battery life (>15 h continuous operation) ensure reliability during extended field surveys and multi-point testing campaigns.
Sample Compatibility & Compliance
The Kanomax 6850 is intended for use with clean, dry, non-corrosive gases — primarily ambient air in indoor environmental and mechanical systems. It is not rated for use with liquids, steam, explosive atmospheres (ATEX), or aggressive chemical vapors. All pressure ports conform to ISO 228-1 parallel thread specifications (M5×0.5) for secure Pitot tube and static probe connections. While not certified to IEC 61000-4 electromagnetic immunity standards as a standalone medical device, its EMC performance meets industrial environment thresholds per CISPR 11 Group 1, Class B. The instrument supports audit-ready documentation workflows and is routinely deployed in facilities operating under FDA 21 CFR Part 11-compliant QA systems when paired with controlled USB export procedures and electronic signature protocols.
Software & Data Management
No proprietary software installation is required: the 6850 operates in USB Mass Storage Class (MSC) mode, appearing as a removable drive upon connection. Exported CSV files contain column headers compatible with common analysis platforms and include metadata such as instrument ID (user-configurable), calibration due date, operator ID field, and UTC timestamps. Internal memory supports data filtering, statistical summary (min/max/mean/stdev), selective deletion, and chronological browsing via intuitive menu navigation. Firmware updates are delivered via downloadable .bin files and applied through the same USB interface — version history and update logs are retained in device memory for traceability.
Applications
- HVAC system commissioning and TAB (Testing, Adjusting, Balancing) per NEBB Procedural Standards.
- Cleanroom and isolator pressure cascade monitoring per ISO 14644-3 and EU GMP Annex 1.
- Fume hood face velocity verification and exhaust system performance evaluation.
- Filter leak testing (e.g., HEPA/ULPA upstream/downstream ΔP monitoring during DOP/PAO scanning).
- Building envelope air leakage assessment using blower door-derived pressure differentials.
- Educational laboratories requiring portable, multi-function instrumentation for fluid mechanics and thermodynamics instruction.
FAQ
What pressure reference does the 6850 use for differential measurements?
It uses two independent, matched absolute pressure sensors; differential pressure is calculated internally as the arithmetic difference between their outputs — no external reference port or vent is required.
Can the unit be calibrated in-house?
Field zeroing (tare) is supported at atmospheric conditions, but full span calibration requires accredited lab service using deadweight testers or NIST-traceable pressure controllers — certificate of calibration is issued per ISO/IEC 17025.
Is the velocity calculation compliant with ISO 16813?
Yes — the built-in algorithm applies the standard Pitot equation with user-input or auto-detected air temperature, and supports both S-type and standard Pitot tube coefficients per ISO 16813 Annex C.
Does the device support data logging intervals or trigger-based capture?
No — logging is manual-start/manual-stop only; it does not support timed interval sampling or analog/digital trigger inputs.
What is the maximum allowable overpressure before sensor damage?
The pressure sensors are rated to withstand static overpressure up to ±10 kPa without permanent drift or failure — well beyond the operational range but not intended for routine exposure.
