INNOTEG IM/IMm Series Microbalance (1 µg Resolution)

Overview

The INNOTEG IM/IMm Series Microbalance is an ultra-high-resolution analytical weighing instrument engineered for trace-level mass determination in regulated and research-intensive environments. Operating on electromagnetic force compensation (EMFC) principle, it delivers consistent 1 µg readability across its primary range (up to 5.1 g), enabling precise quantification of microgram-scale samples critical in elemental analysis, environmental particulate monitoring (e.g., PM2.5 filter weighing), and volumetric calibration of pipettes per ISO 8655 and USP . Its design addresses key metrological challenges inherent in sub-milligram measurements—namely electrostatic interference, air current sensitivity, and thermal drift—through integrated physical and electronic countermeasures. The system complies with international weighing standards including OIML R76, ISO/IEC 17025, and supports audit-ready documentation required under FDA 21 CFR Part 11 when used with validated WinCT software.

Key Features

• 1 µg resolution with 0.0012 mg repeatability (IMm-5 model), meeting minimum weight requirements per USP for high-risk applications
• Integrated DC ionizer delivering zero-airflow static neutralization—eliminates sample dispersion without disturbing convection-sensitive weighings
• Conductive anti-static coating on draft shield glass minimizes surface charge accumulation from operator contact or sample handling
• Ergonomic lateral-sliding door mechanism enables simultaneous door operation and sample placement using both hands
• Perforated SUS316 weighing pan (Ø25 mm) reduces buoyancy effects and improves air exchange uniformity inside the chamber
• Dual-interface connectivity: RS-232C and USB allow concurrent connection to PC + printer, PC + data logger, or PC + external display
• Motor-driven internal calibration system with single-button activation; built-in reference weights traceable to national standards
• Onboard memory stores up to 200 measurement records and 50 calibration logs with timestamp, operator ID, and environmental metadata

Sample Compatibility & Compliance

The IM/IMm series accommodates diverse sample forms—including powders, filters, crucibles, micro-vials, and calibration weights—within a thermally stable, vibration-damped housing. Its sealed EMFC transducer and low-thermal-drift sensor architecture ensure stability across ambient fluctuations (15–30 °C, 45–75% RH non-condensing). All models meet ISO 9001 manufacturing controls and are supplied with factory calibration certificates traceable to NIM (National Institute of Metrology, China). For regulated labs, the balance supports GLP/GMP-compliant reporting via WinCT, generating audit trails with electronic signatures, change history, and deviation alerts aligned with Annex 11 and ALCOA+ principles.

Software & Data Management

WinCT is a dedicated metrology application certified for use in quality-controlled laboratories. It provides real-time data streaming, statistical process control (SPC) charts, uncertainty calculation per GUM (JCGM 100), and automated report generation in ISO/IEC 17025-compliant formats. Data export supports CSV, PDF, and XML schemas compatible with LIMS integration. The software enforces role-based access control, electronic signature workflows, and full 21 CFR Part 11 compliance—including audit trail integrity, record retention, and system validation support documentation.

Applications

• Gravimetric analysis of airborne particulates (PM2.5, PM10) on quartz or Teflon filters per EPA Method 201A and ISO 12103-1
• Elemental analysis sample preparation, including ICP-MS and AAS standard dilution verification
• Pipette performance verification per ISO 8655-6, including gravimetric volume assessment at 1–100 µL levels
• Pharmaceutical reference standard weighing during assay development and stability studies
• Nanomaterial dosing in toxicology research where batch-to-batch mass consistency is critical
• Calibration of Class E1 and E2 weights in metrology labs operating under ISO/IEC 17025 accreditation

FAQ

What is the minimum weight requirement for reliable measurement on the IMm-5 model?

Per USP , the minimum weight is 2.0 mg at 1 µg readability, verified under routine environmental conditions and proper static mitigation.
Does the balance support external calibration with certified weights?

Yes—it accepts manual external calibration using Class E2 or better weights; however, internal motorized calibration is recommended for daily verification to maintain traceability.
Can WinCT software be validated for use in FDA-regulated environments?

Yes—WinCT includes IQ/OQ documentation templates, electronic signature configuration, and audit trail export functionality required for 21 CFR Part 11 validation.
How does the perforated weighing pan improve measurement reliability?

The mesh geometry minimizes convective turbulence and pressure differentials beneath the pan, reducing buoyancy-induced error and accelerating stabilization time by up to 30% compared to solid pans.
Is the anti-static system compliant with IEC 61340-5-1 for ESD-sensitive environments?

The DC ionizer meets IEC 61340-5-1 discharge decay time requirements (<2 s) and operates without airflow, eliminating particle resuspension risks common in compressed-air ionizers.