Longteng ES Series Precision Mass Comparator
| Brand | Longteng |
|---|---|
| Origin | Liaoning, China |
| Manufacturer Type | Authorized Distributor |
| Product Category | Domestic |
| Model | ES Series |
| Price Range | USD 1,400 – 4,200 (FOB) |
| Instrument Type | Precision Mass Comparator |
| Maximum Capacity | 5,000 g |
| Readability | 0.01 g |
| Repeatability | ≤ ±0.01 g |
| Calibration Method | Automatic Internal Calibration |
| Pan Dimensions | Up to 340 × 300 mm |
| External Dimensions | Up to 460 × 315 × 160 mm |
| Compliance | Meets JJG 99-2006 (Chinese National Verification Regulation for Weights), ISO/IEC 17025 traceable operation |
Overview
The Longteng ES Series Precision Mass Comparator is a high-stability, dual-range analytical comparator engineered for metrological-grade mass comparison in calibration laboratories, national metrology institutes, and industrial quality control environments. Unlike conventional balances, the ES Series operates on electromagnetic force compensation (EMFC) principle with active temperature-compensated sensor architecture, enabling direct comparative measurement between reference standards and test weights under controlled environmental conditions. Designed specifically for verification of Class E1–F2 stainless steel and cast-iron weights per OIML R111 and JJG 99-2006, the instrument delivers traceable mass comparisons with minimal drift and optimized thermal equilibrium response. Its rigid monolithic frame, anti-vibration base interface, and enclosed draft shield minimize mechanical perturbation—critical for sub-10 mg uncertainty budgets in weight calibration workflows.
Key Features
- Electromagnetic force compensation (EMFC) transducer with auto-zero stabilization and real-time drift compensation
- Automatic internal calibration using built-in reference masses traceable to national standards
- Multi-point linearity optimization across full capacity range (2000 g to 5000 g)
- Adjustable weighing pan configurations: rectangular (340 × 300 mm) for large cast-iron weights; circular (Φ160 mm or Φ90 mm) for precision standard weights
- Dual readability modes: 0.01 g for routine F2-class verification; optional 0.5 mg resolution on ES-1F1 variant for E2-level comparisons
- Integrated environmental monitoring: internal temperature and humidity sensors feed dynamic stability algorithms
- RS-232 and USB interfaces compliant with ISO/IEC 17025 data integrity requirements
Sample Compatibility & Compliance
The ES Series accommodates standard cylindrical, hexagonal, and rectangular cast-iron and stainless-steel weights from 1 g to 30 kg. Each model supports OIML R111-defined handling protocols—including tare-based differential weighing, substitution methods (ABBA, BABA), and multi-step mass ratio analysis. All units are verified against JJG 99-2006 “Verification Regulation for Weights” and support traceability documentation per ISO/IEC 17025 clause 6.5. The comparator’s mechanical design conforms to ISO 9001 manufacturing controls, and its software architecture supports audit-ready records required for GLP/GMP-regulated calibration labs. Optional NIST-traceable certificate packages available upon request.
Software & Data Management
The ES Series integrates with Longteng MassCal Suite v3.2—a Windows-based metrology application supporting automated weight verification sequences, uncertainty budgeting (GUM-compliant), and report generation in PDF/XLSX formats. Data export complies with FDA 21 CFR Part 11 requirements via configurable user authentication, electronic signatures, and immutable audit trails. Raw measurement logs include timestamped environmental metadata (temperature, humidity, barometric pressure), sensor diagnostics, and calibration history—enabling full forensic reconstruction of each comparison cycle. Data can be exported directly to LIMS platforms via CSV or OPC UA protocol.
Applications
- Primary and secondary calibration of OIML Class E1–F2 weights in metrology labs
- Periodic verification of working standards used in pharmaceutical manufacturing (USP , EP 2.1.1)
- Mass stability monitoring of reference weights during long-term storage
- Comparative testing of newly cast iron weights prior to surface finishing and material certification
- Supporting ISO/IEC 17025 accreditation audits through documented repeatability, linearity, and sensitivity tests
- Education and training in metrological principles at technical universities and national institutes
FAQ
What weight classes can the ES Series verify?
The ES Series is validated for OIML R111 Classes E1 through F2, covering nominal values from 1 g to 30 kg.
Does the instrument meet international calibration standards?
Yes—it is designed and verified per JJG 99-2006 and supports full traceability to national metrology institutes (e.g., NIM China) with optional calibration certificates.
Is external calibration required after installation?
No. The automatic internal calibration system eliminates need for external weights during daily operation; however, annual verification with certified standards is recommended per ISO/IEC 17025.
Can the ES Series operate in non-air-conditioned workshops?
It is rated for ambient operation between 15–30 °C and 30–70% RH; performance specifications assume stable temperature gradients (<0.5 °C/h) and low air turbulence.
How is measurement uncertainty calculated?
Uncertainty budgets follow GUM (JCGM 100:2008) methodology, incorporating contributions from repeatability, linearity, eccentricity, temperature coefficient, and calibration standard uncertainty—all accessible within MassCal Suite.
