Kanomax DALT6900 Duct Air Leakage Tester with NIM Certification

Overview

The Kanomax DALT6900 Duct Air Leakage Tester is a precision-engineered instrument designed for quantitative assessment of air leakage in HVAC ductwork systems under controlled positive and negative static pressure conditions. It operates on the principle of calibrated orifice (nozzle) flow measurement combined with real-time differential pressure sensing, enabling direct determination of volumetric leakage rate (m³/h) at specified test pressures. The system conforms to internationally recognized duct airtightness testing protocols—including EN 1507, EN 12237, Eurovent 2/2, DW/143, SMACNA’s “HVAC Air Duct Leakage Test Manual”, and China’s mandatory standard GB 50243–2002—making it suitable for commissioning verification, post-installation QA/QC, and regulatory compliance audits in commercial, institutional, and industrial building projects. Certified by China’s National Institute of Metrology (NIM), the DALT6900 ensures traceable measurement accuracy and metrological validity required for third-party inspection reports and statutory acceptance documentation.

Key Features

• Simultaneous dual-mode operation: measures leakage under both pressurization (+2500 Pa) and depressurization (–2500 Pa) conditions per test sequence
• Multi-range calibrated nozzle assembly (4–36 m³/h) integrated with high-capacity blower (36–640 m³/h), enabling accurate low-flow detection and high-volume system validation without manual range switching
• Real-time synchronized display of leakage volume, static pressure, ambient temperature, and atmospheric pressure on a 4.7-inch color LCD touchscreen interface
• Embedded data logging engine stores up to 1000 complete test records—including timestamp, pressure setpoint, measured leakage, environmental parameters, and pass/fail status—accessible via on-device navigation
• Rugged, portable chassis (72 kg, 540 × 500 × 1200 mm) with integrated casters and modular blower/nozzle mounting for rapid field deployment and reconfiguration
• Auto-calibration verification routine supports daily operational checks; all critical sensors (differential pressure transducers, RTD temperature probe, barometric sensor) are factory-traceable to NIM standards

Sample Compatibility & Compliance

The DALT6900 is validated for use across diverse duct construction types—including sheet metal (galvanized steel, stainless), fiberglass-reinforced plastic (FRP), flexible ducts (with appropriate sealing adapters), and lined rectangular or round ducts—as defined in EN 12237 Annex A and SMACNA Section 4. It accommodates both segment-level testing (e.g., individual duct runs prior to insulation) and whole-system integrity verification (e.g., post-commissioning of AHUs, VAV boxes, and terminal devices). Its measurement methodology satisfies the requirements for Class A (tight), Class B (medium), and Class C (loose) duct leakage classifications per EN 1507 Table 1 and GB 50243–2002 Clause 5.2.3. All test reports generated meet documentation requirements for LEED EQ Credit 1, ASHRAE Guideline 12-2020, and local building code enforcement agencies conducting mechanical system inspections.

Software & Data Management

While the DALT6900 operates as a standalone field instrument with no PC dependency, its internal firmware supports export-ready data formatting compatible with common engineering reporting workflows. Test records include ISO 8601 timestamps, pressure ramp profiles, and pass/fail flags derived from user-defined acceptance thresholds aligned with project specifications (e.g., ≤3% leakage at 750 Pa for SMACNA Class A). Data can be reviewed, filtered, and deleted directly on-device; no proprietary software or drivers are required for basic operation. For integration into enterprise QA/QC platforms, exported CSV files retain full metrological metadata—including sensor serial numbers, calibration due dates, and NIM certificate reference IDs—supporting GLP-aligned audit trails and FDA 21 CFR Part 11–compliant record retention when paired with validated document management systems.

Applications

• Pre-commissioning verification of ductwork airtightness prior to thermal insulation and ceiling closure
• Post-installation leak detection and quantification in hospital HVAC systems requiring ISO 14644-1 Class 7–8 cleanroom pressure differentials
• Third-party certification testing for green building rating programs (LEED, BREEAM, China 3-Star)
• Annual performance audits of aging HVAC infrastructure in data centers, laboratories, and pharmaceutical manufacturing facilities
• Educational use in HVAC engineering labs for hands-on instruction on duct system energy loss mechanisms and leakage mitigation strategies
• Regulatory compliance testing mandated by provincial construction quality supervision stations and municipal building energy efficiency offices

FAQ

Does the DALT6900 require annual recalibration by an accredited lab?
Yes. While the unit includes built-in zero and span verification routines, NIM-mandated periodic recalibration—at minimum every 12 months—is required to maintain traceability and legal metrological validity for official test reports.
Can the DALT6900 test ducts exceeding 2500 Pa design pressure?
No. The instrument’s pressure control and safety interlocks are engineered for operation within ±2500 Pa. Testing beyond this range requires alternative high-pressure test rigs compliant with EN 1507 Annex B.
Is firmware upgrade supported in the field?
Yes. Kanomax provides downloadable firmware updates via secure FTP portal; updates preserve all stored test data and require only a USB memory stick and brief power cycle.
What environmental conditions affect measurement uncertainty?
Ambient temperature extremes (55 °C), rapid barometric shifts (>1 kPa/hr), and high humidity (>90% RH) may increase thermal drift in flow sensors; users should allow 15-minute thermal stabilization before initiating formal tests.
How does the DALT6900 handle variable duct geometry during testing?
The instrument does not measure geometry directly; instead, it applies standardized test pressures per duct class and calculates leakage rate relative to nominal duct surface area—a value entered manually or preloaded from project BIM models via optional CSV import.