The **PW10-R10** is a high-precision, single-point load cell manufactured by **HBM (Hottinger Brüel & Kjaer)**. It is primarily used in industrial weighing applications such as platform scales, belt scales, and filling systems. Below is a breakdown of its electronic and technical components. --- ## 1. Core Electronic Specifications The PW10-R10 operates on the principle of **strain gauge technology**. When a load is applied, the internal resistance changes, which is then converted into an electrical signal. | Parameter | Specification | | :--- | :--- | | **Rated Capacity ($E_{max}$)** | 10 kg (indicated by the "10" in the model name) | | **Accuracy Class** | C3 (OIML R60 standard) | | **Sensitivity ($C_n$)** | 2.0 mV/V ± 0.1% | | **Input Resistance ($R_{LC}$)** | 350 $\Omega$ to 480 $\Omega$ | | **Output Resistance ($R_o$)** | 350 $\Omega$ ± 10% | | **Excitation Voltage** | 5V to 15V (Recommended) | | **Insulation Resistance** | > 5 G$\Omega$ | --- ## 2. Internal Components & Construction ### A. Strain Gauge Bridge The heart of the PW10-R10 is a **Wheatstone Bridge** circuit. * **Function:** Four strain gauges are bonded to the measuring body. As the body deforms under weight, the gauges stretch or compress, changing their electrical resistance. * **Temperature Compensation:** The unit includes internal resistors to compensate for "Zero Point" and "Span" shifts caused by temperature fluctuations. ### B. The Measuring Body * **Material:** High-strength Aluminum. * **Design:** It features a "Parallel-Beam" geometry. This allows the sensor to compensate for off-center loads (eccentricity), meaning the weight reading remains accurate even if the object is not placed perfectly in the center of the scale platform. ### C. Protection & Sealing * **IP Rating:** IP67. * **Electronics Protection:** The strain gauges are encapsulated with a special potting compound or silicone rubber to protect the delicate circuitry from moisture and dust. --- ## 3. Wiring and Connection The PW10-R10 typically uses a **6-wire configuration**. This 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 (Ground) | | **Green** | Signal (+) | Positive measurement output | | **White** | Signal (-) | Negative measurement output | | **Grey** | Sense (+) | Feedback for voltage regulation | | **Pink** | Sense (-) | Feedback for voltage regulation | | **Yellow** | Shield | Connected to the housing for EMI protection | --- ## 4. Key Electronic Features 1. **High Sensitivity:** With a 2.0 mV/V output, it provides a strong enough signal to be easily processed by standard ADCs (Analog-to-Digital Converters) like the HX711 or industrial weight indicators. 2. **Low Hysteresis:** The electronic design ensures that the reading returns to zero accurately after the load is removed. 3. **EMI/RFI Shielding:** The 6-wire cable is shielded to prevent electrical noise from motors or radio frequencies from interfering with the millivolt signal.