OHAUS Defender™ 2500 i-DT25P Industrial Weight Indicator

Overview

The OHAUS Defender™ 2500 i-DT25P Industrial Weight Indicator is a purpose-built digital weighing interface engineered for integration into fixed industrial scale systems, benchtop platforms, and process control environments. Designed in accordance with fundamental principles of load cell signal conditioning and analog-to-digital conversion, the i-DT25P processes mV/V input signals from strain-gauge-based load cells—supporting standard excitation voltages (typically 5–10 V DC) and delivering stable, noise-resistant weight data at up to 30,000 internal resolution divisions. Its architecture prioritizes operational robustness over feature proliferation, making it suitable for continuous-duty applications where reliability, repeatability, and compliance with national metrological requirements are essential. The device complies with China’s CPA (China Pattern Approval) certification framework, ensuring conformity with JJG 539–2016 (Verification Regulation for Nonautomatic Weighing Instruments) and enabling legal-for-trade use in domestic commercial and light-industrial weighing scenarios.

Key Features

• High-contrast 6-digit, 28 mm tall 7-segment LCD display with uniform white backlight—optimized for rapid visual verification under variable ambient lighting conditions including factory floor illumination.
• Dual power flexibility: supports both AC operation via included USB-C adapter and battery-powered deployment using four standard AA alkaline cells (battery life up to 70 hours under typical usage).
• Triple-standard communication suite: RS232 serial port (3-wire, TTL-level compatible), USB-C host interface (for direct connection to PCs, PLCs, or label printers), and Mini-DIN connector (commonly used for legacy scale head integration or auxiliary I/O expansion).
• Real-time status feedback: integrated stability indicator (green LED), overload/underload warning (red LED), and dynamic hold modes—including peak-hold for transient force capture and dynamic-hold for vibration-prone environments.
• Configurable operational logic: user-selectable auto-tare threshold, programmable auto-power-off delay, adjustable filter levels for noisy mechanical environments, and customizable unit switching (g/kg) without recalibration.
• Mechanically resilient housing: impact-resistant ABS front panel with IP-rated sealing integrity (though formal IP classification is not declared), mounted on a rigid carbon steel U-bracket with powder-coated finish for corrosion resistance and long-term structural stability.

Sample Compatibility & Compliance

The i-DT25P is intended for use with single- or multi-load-cell platforms rated up to 0.8 kg net capacity—common in packaging line checkweighers, small-part assembly stations, and laboratory material dispensing systems. It does not support multi-point calibration out-of-the-box nor advanced diagnostics such as load cell health monitoring. As a CPA-certified instrument, it meets mandatory metrological requirements for accuracy class III (per GB/T 7722–2017, equivalent to OIML R76-1). While not explicitly validated for FDA 21 CFR Part 11 or ISO/IEC 17025 environments, its deterministic firmware behavior, audit-ready parameter logging (via RS232/USB), and absence of cloud connectivity make it suitable for GLP-aligned workflows where traceability is maintained through external data capture systems.

Software & Data Management

The i-DT25P operates autonomously without embedded operating system or graphical user interface. All configuration is performed locally via front-panel keypad navigation. Data output is strictly protocol-driven: ASCII-formatted weight strings (e.g., “S+00123.4 g”) transmitted at user-defined baud rates (RS232) or as HID-compliant keyboard wedge data (USB-C). No proprietary drivers or cloud services are required. When interfaced with SCADA or MES platforms, timestamps must be applied externally, as the indicator lacks real-time clock functionality. Firmware updates—if released—are delivered via USB-C using OHAUS-provided utility software compatible with Windows 10/11.

Applications

• Production line piece-counting: leverages built-in counting mode with sample-weight learning and statistical averaging across 10–50 reference units.
• Batch filling verification: utilizes dynamic hold and accumulation functions to sum sequential additions during multi-step dosing operations.
• Quality assurance checkpoint: integrates with reject gates or PLC-controlled diverters via discrete I/O (when paired with optional relay module).
• Warehouse receiving: supports quick tare-and-weigh cycles for incoming raw materials with minimal operator training.
• Educational instrumentation labs: serves as an entry-level platform for teaching transducer signal conditioning, ADC resolution trade-offs, and NIST-traceable calibration fundamentals.

FAQ

Is the i-DT25P certified for trade use in China?

Yes—it carries official CPA (China Pattern Approval) certification per JJG 539–2016, authorizing its use in commercial transactions where weight determines value.
Does it support Ethernet or wireless communication?

No—only wired interfaces are provided: RS232, USB-C, and Mini-DIN. Network connectivity requires external gateway hardware.
Can it store calibration coefficients internally?

Yes—calibration parameters (span, zero, linearity offset) are retained in non-volatile memory and persist through power cycling.
What is the maximum recommended cable length between the indicator and load cell?

For optimal signal integrity, OHAUS recommends ≤10 meters of shielded twisted-pair cable with proper grounding at the indicator end.
Is firmware update capability available?

Firmware upgrades are supported via USB-C using OHAUS-provided desktop utilities; no over-the-air or web-based update mechanism exists.