Biaozhuo LMJ-5 Calibration System for Building Window and Door Physical Performance Testers

Overview

The Biaozhuo LMJ-5 Calibration System is a metrologically traceable verification platform engineered for the periodic calibration and performance validation of building window and door physical performance testers—specifically those used to assess air permeability (airtightness), water penetration resistance (water tightness), and wind load resistance (structural deflection and pressure stability). Designed in strict accordance with JJG (YU) 174–2014 “Verification Regulation for Testing Equipment of Air-tightness, Water-tightness and Wind-load Resistance of Exterior Windows and Doors”, the system implements a multi-parameter, integrated calibration methodology grounded in primary measurement principles: differential pressure transduction, gravimetric water flow quantification, linear displacement metrology via precision micrometer actuation, and volumetric airflow referencing. Unlike generic calibration tools, the LMJ-5 functions as a reference standard test rig—featuring a certified standard simulated window assembly, enabling full-system functional verification under conditions replicating actual field testing protocols defined in ISO 12210-2, EN 12152, and GB/T 7106–2019.

Key Features

• Modular architecture comprising a central touchscreen display unit, calibrated pressure transducers (50–6000 Pa range, Class 0.5 accuracy), thermal mass airflow sensors (50–500 m³/h, ±1% FS), high-resolution linear micrometer (0–25 mm, 0.005 mm resolution), and a gravimetric water collection subsystem with electromagnetic valve control and dynamic load cell weighing.
• Real-time synchronized acquisition and visualization of pressure, airflow, water flow, and displacement data—including time-stamped pressure ramping profiles (rise rate, stabilization duration, depressurization slope) for evaluating closed-loop pressure control fidelity of host testers.
• Standard simulated window equipped with embedded pressure and air flow transmitters, enabling direct cross-calibration of the DUT’s (Device Under Test) sensor outputs against NIST-traceable references.
• Gravimetric water flow calibration: collected spray water is dynamically weighed during operation; flow rate is calculated from mass/time derivative, eliminating reliance on orifice-based assumptions and ensuring compliance with ISO 12210-2 Annex B requirements for water tightness verification.
• Touchscreen HMI with intuitive interface supporting data logging, curve export (CSV/PNG), and on-screen pass/fail assessment against JJG (YU) 174–2014 tolerance limits.

Sample Compatibility & Compliance

The LMJ-5 is compatible with all commercially available window and door physical performance testers conforming to national and international structural testing standards—including but not limited to GB/T 7106–2019, ISO 12210-2:2015, EN 12152:2016, and ASTM E283/E331/E1233. Its modular design accommodates both single- and multi-chamber test configurations. All internal transducers are factory-calibrated with documented uncertainty budgets and supplied with calibration certificates traceable to CNAS-accredited laboratories. The system supports GLP-compliant operation through user-accessible audit trails, electronic signatures (optional), and configurable report templates aligned with ISO/IEC 17025 documentation requirements.

Software & Data Management

The embedded firmware provides local data storage (≥10,000 test records), timestamped parameter logging at configurable intervals (100 ms to 5 s), and export functionality via USB 2.0. Raw datasets include pressure vs. time arrays, cumulative water mass curves, displacement snapshots, and airflow stability indices. Software output formats comply with laboratory information management system (LIMS) ingestion standards: CSV (tab-delimited), XML metadata wrappers, and PNG vector plots. Optional PC-based analysis suite enables statistical process control (SPC) charting, repeatability/reproducibility (R&R) analysis per MSA AIAG guidelines, and automated generation of calibration certificates per ISO 10012.

Applications

• Periodic verification of accredited testing laboratories performing third-party certification per CCC, CE, or JIS marks.
• Factory acceptance testing (FAT) and commissioning support for new window/door performance tester installations.
• Troubleshooting drift or nonlinearity in pressure control modules, airflow metering systems, or deflection measurement subassemblies.
• Supporting ISO/IEC 17025 internal audits by providing objective evidence of measurement traceability and uncertainty quantification for all four critical parameters (pressure, air flow, water flow, displacement).
• Training and proficiency testing for laboratory technicians conducting EN 12152 or GB/T 7106 compliance assessments.

FAQ

Does the LMJ-5 meet international calibration traceability requirements?
Yes—transducers are calibrated against CNAS-accredited primary standards; full uncertainty budgets and certificate numbers are provided with each unit.
Can the system validate both static and dynamic pressure control performance?
Yes—it measures rise time, dwell stability (±10 Pa over 60 s), and depressurization linearity per JJG (YU) 174–2014 Section 5.3.2.
Is gravimetric water flow measurement mandatory for accreditation?
Per ISO 12210-2 Annex B and GB/T 7106–2019 Clause 6.3.2, gravimetric methods are the reference technique for water flow calibration; the LMJ-5 implements this requirement directly.
What maintenance is required for long-term accuracy?
Annual recalibration of all sensors is recommended; the micrometer and load cell require biannual cleaning and zero-check per manufacturer SOPs.
Is remote firmware update supported?
No—firmware updates are performed locally via USB using validated release packages distributed under Biaozhuo’s ISO 9001-controlled change management process.