Longteng ES-1000M1 High-Capacity Mass Comparator for M1 Class Weights
| Brand | Longteng |
|---|---|
| Origin | Liaoning, China |
| Model | ES-1000M1 |
| Maximum Capacity | 1000 kg |
| Readability | 5 g |
| Repeatability | ±5 g |
| Pan Size | 1200 × 1000 mm |
| External Dimensions | 1200 × 1000 × 550 mm |
| Calibration | Automatic |
| Accuracy Class | M1 (per OIML R111) |
| Compliance | Patented calibration and damping mechanisms |
Overview
The Longteng ES-1000M1 is a high-capacity mass comparator engineered for metrological verification of large-scale standard weights—specifically designed to meet the requirements of OIML R111 for M1 class reference weights up to 1000 kg. Unlike general-purpose industrial scales, this instrument operates on the principle of differential weighing using electromagnetic force compensation (EMFC) or high-stability load cell architecture with advanced thermal drift compensation, ensuring minimal sensitivity to environmental fluctuations during extended comparison cycles. Its core function is to determine mass deviation between a reference standard and a test weight under controlled laboratory conditions, supporting traceable calibration in national metrology institutes, accredited calibration laboratories, and high-precision manufacturing QA departments. The ES-1000M1 conforms to ISO/IEC 17025 requirements for measurement uncertainty evaluation and supports documented audit trails essential for GLP and GMP environments.
Key Features
- Patented automatic calibration system integrated with internal reference masses, enabling in-situ verification without external standards.
- Dedicated damping (‘resting’) mechanism—protected by Chinese Utility Model Patent—to suppress mechanical oscillation and stabilize readings within ≤3 seconds after loading.
- Large-format weighing pan (1200 × 1000 mm) constructed from stainless steel with reinforced structural support, optimized for uniform load distribution across tonne-range weights.
- High-resolution digital display with 5 g readability and repeatability of ±5 g, validated per ISO 9001-compliant factory testing protocols.
- Robust cast-iron base with vibration-dampening feet, minimizing influence from floor-borne disturbances typical in metrology labs.
- RS-232 and optional USB/Ethernet interfaces for integration into LIMS or calibration management software platforms.
Sample Compatibility & Compliance
The ES-1000M1 is explicitly intended for comparative mass measurement of cylindrical, rectangular, or annular M1-grade stainless-steel or cast-iron weights ranging from 500 g to 1000 kg. It accommodates standard OIML R111 geometries—including Class M1 1 kg, 2 kg, 5 kg, 10 kg, 20 kg, 50 kg, 100 kg, 200 kg, 500 kg, and 1000 kg weights—with full compatibility for both single-piece and modular configurations. All mechanical and electronic subsystems comply with IEC 61326-1 (EMC for measurement equipment) and IEC 61000-4 series immunity standards. The device satisfies the mechanical stability and environmental tolerance criteria defined in JJG 99–2023 (Chinese National Verification Regulation for Weighing Instruments) and serves as a primary comparator in laboratories accredited to CNAS CL01 (equivalent to ISO/IEC 17025). Optional documentation packages include uncertainty budgets aligned with GUM (JCGM 100) and traceability statements referencing BIPM CIPM MRA signatory NMIs.
Software & Data Management
The ES-1000M1 supports standardized ASCII data output via serial interface, compatible with common calibration software including MET/CAL, UltraCal, and LabWare LIMS. Raw measurement logs include timestamp, gross/net mass, deviation from nominal value, temperature/humidity metadata (when connected to optional environmental sensors), and operator ID. Audit-trail functionality records all parameter changes, calibration events, and user logins—meeting FDA 21 CFR Part 11 requirements when deployed with validated third-party software. Firmware updates are delivered via secure USB firmware loader; version history and checksum verification ensure integrity control. Export formats include CSV and XML for downstream statistical process control (SPC) analysis in Minitab or JMP.
Applications
- Primary verification of M1-class reference weights in national metrology institutes and regional calibration centers.
- Periodic in-house verification of working standards used in pharmaceutical balance qualification (per USP and EU Annex 11).
- Mass calibration of industrial load cells and platform scales prior to field deployment.
- Material density determination via substitution weighing in metallurgical and aerospace quality control labs.
- Supporting ISO 14001-compliant mass flow accounting in recycling facilities handling scrap metal or precious alloys.
- Verification of certified reference materials (CRMs) where mass assignment requires sub-0.01% relative uncertainty at kilogram scale.
FAQ
What accuracy class does the ES-1000M1 support for weight verification?
It is configured and verified for M1 class weight comparisons per OIML R111, with expanded uncertainty (k=2) typically ≤ 0.003% of reading under controlled lab conditions.
Can the ES-1000M1 be used for legal-for-trade applications?
No—it is a metrological comparator, not a trade-approved weighing instrument; it lacks NTEP or MID certification and is intended solely for calibration laboratory use.
Is thermal compensation active during extended measurement sessions?
Yes; the internal temperature sensor triggers adaptive zero-tracking and gain adjustment every 60 seconds, maintaining stability over 8-hour continuous operation.
Does the resting mechanism require manual activation?
No—the damping system engages automatically upon load application and disengages only after stable equilibrium is confirmed by dual-sensor convergence logic.
What environmental conditions are recommended for optimal performance?
Operating range: 15–25 °C ambient, ≤ 60% RH non-condensing; installation requires vibration-isolated concrete slab with < 2 µm/s RMS floor motion at 10 Hz.
