SMARTWEIGH INSTRUMENT CO.,LTD
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Inspection Procedures for Industrial Weighing Systems
Visual Inspection: A thorough visual check is the first step. Technicians look for any visible signs of damage, wear, or corrosion on the scale's platform, support structure, and surrounding environment. This includes checking for debris or objects that could interfere with the scale's movement.
Cable and Connection Check: All cables and connections, especially those leading to the load cells and indicator, are inspected for fraying, damage, or loose connections. Secure and clean connections are essential for accurate signal transmission.
Foundation and Environment: The foundation of the weighing system is checked for cracks, shifting, or unevenness. The surrounding area is also assessed for potential environmental factors, such as excessive vibration, moisture, or extreme temperatures, which could impact performance.
Zero Balance Check: The system's zero balance is checked with no load on the scale. The indicator should display a stable zero reading. Any drift or inability to zero out could indicate a problem with the load cells or electronics.
Span Calibration: This is the most critical part of the inspection. A series of certified test weights is used to check the system's linearity and accuracy across its weighing range. The weights are applied incrementally, and the displayed weight is compared to the known weight of the test weights. Any discrepancies are noted and corrected.
Repeatability Test: This test involves placing the same weight on the scale multiple times to ensure it consistently provides the same reading. This verifies the system's ability to produce reliable and repeatable measurements.
Load Cell Performance: The individual load cells are often checked to ensure they are functioning correctly and that their outputs are balanced. This can be done using a multimeter or a dedicated load cell tester.
Indicator and Software Check: The weighing indicator's display and functionality are tested. This includes checking for proper key functionality, stable readings, and correct data transmission to any connected software or peripheral devices.
Safety and Overload Test: The system's overload protection is checked to ensure it activates correctly and prevents damage to the load cells when excessive weight is applied. Safety features, such as emergency stop buttons, are also tested.
Specifications:
| Parameter | Specifications |
| Weighing Range | Min: 0.1 kg – Max: 50,000 kg (varies by model) |
| Tolerance (Error Limit) | ±0.1% of reading (for Class III) or ±1 division (whichever is stricter) |
| Frequency | Every 6 months (or after 500 hours of operation) |
| Calibration Weights | Class F1/M1 (OIML R111) with valid certification |
| Temperature Range | -10°C to +40°C (operational), -20°C to +60°C (storage) |
| Humidity Tolerance | 10% to 90% RH (non-condensing) |
| Load Cell Type | Strain gauge (standard), Capacitive (high precision) |
| Overload Protection | 150% of max capacity (safety limit) |
| Power Supply | 110–240V AC, 50/60Hz or 24V DC (±5%) |
| EMC/EMI Resistance | Complies with EN 61326-1 (industrial EMC standards) |
