The **PW10B-R10** is a high-precision, industrial-grade single-point load cell manufactured by **HBM (Hottinger Brüel & Kjaer)**. It is specifically designed for high-capacity weighing platforms and industrial scales. Below is a detailed breakdown of its electronic and mechanical specifications. --- ### 1. Core Technical Specifications The PW10B series is known for its "Max" platform size capability and its high accuracy classes. | Feature | Specification | | :--- | :--- | | **Sensor Type** | Strain Gauge (Single Point) | | **Max Capacity ($E_{max}$)** | 50 kg to 635 kg (R10 usually refers to specific sizing/rev) | | **Accuracy Class** | C3, C3MR (OIML R60 approved) | | **Max Platform Size** | 600 x 600 mm | | **Material** | Aluminum (Colorless Anodized) | | **Protection Class** | IP67 | --- ### 2. Electronic Characteristics As a passive resistive sensor, the PW10B-R10 operates based on the Wheatstone Bridge principle. #### Electrical Parameters * **Sensitivity (Rated Output):** 2.0 mV/V ± 0.2 mV/V. This means at full capacity, with a 10V excitation, the output will be 20mV. * **Input Resistance:** 350 $\Omega$ to 480 $\Omega$. * **Output Resistance:** 350 $\Omega \pm 10\%$. * **Excitation Voltage:** Recommended 5V to 12V (Maximum 15V AC/DC). * **Insulation Resistance:** > 2 G$\Omega$ (at 100V DC). #### Signal Wiring (6-Wire Configuration) The PW10B-R10 typically uses a **6-wire shielded cable**. The 6-wire system is superior to 4-wire systems because it includes "Sense" lines to compensate for voltage drops over long cable lengths. | Wire Color | Function | Description | | :--- | :--- | :--- | | **Blue** | Excitation (+) | Positive Power Supply | | **Black** | Excitation (-) | Negative Power Supply | | **Green** | Signal (+) | Positive Measurement Output | | **White** | Signal (-) | Negative Measurement Output | | **Green/Yellow** | Sense (+) | Feedback for Voltage Regulation | | **Red/Blue** | Sense (-) | Feedback for Voltage Regulation | --- ### 3. Performance Features * **Temperature Compensation:** The unit is electronically compensated for temperature shifts between $-10^\circ \text{C}$ and $+40^\circ \text{C}$. * **Off-Center Load Compensation:** Electronically adjusted so that the weight reading remains consistent even if the load is placed at the corners of a 600x600mm platform. * **High Impedance:** The 350 $\Omega$ bridge minimizes current consumption, making it suitable for battery-operated industrial scales. --- ### 4. Integration Requirements To read data from a PW10B-R10, you require an **Instrumentation Amplifier** or a **Load Cell Digitizer** (e.g., HX711 for DIY, or HBM PMX for industrial use). ```python # Example: Conceptual Scaling Calculation # Weight = (Measured_mV / (Excitation_V * Sensitivity)) * Max_Capacity excitation = 10.0 # Volts sensitivity = 2.0 # mV/V capacity = 100 # kg measured_mv = 10.0 # Output from sensor # Calculation weight = (measured_mv / (excitation * sensitivity)) * capacity print(f"Calculated Weight: {weight} kg") ```