The **HTS-81-R** is typically identified as a high-precision, industrial-grade humidity and temperature sensor/transmitter. It is designed for demanding environments such as HVAC systems, cleanrooms, and industrial automation. Below is a detailed breakdown of its electronic components and technical specifications. --- ### 1. Key Electronic Components The device is an integrated system consisting of sensing elements and signal processing circuitry: | Component | Function | | :--- | :--- | | **Sensing Element** | Typically a capacitive polymer sensor for humidity and a PT100/PT1000 RTD for temperature. | | **Microprocessor** | Converts analog signals from the sensors into digital data and applies calibration offsets. | | **Signal Converter** | Transforms digital data into standard industrial output signals (e.g., 4-20mA or 0-10V). | | **Protection Circuitry** | Includes reverse polarity protection and surge protection for industrial power stability. | --- ### 2. Technical Specifications The electronics are engineered for stability and accuracy over long periods. | Feature | Specification (Typical) | | :--- | :--- | | **Power Supply** | 12 - 36 VDC | | **Humidity Range** | 0% to 100% RH | | **Temperature Range** | -40°C to +120°C (depending on probe model) | | **Output Signals** | 4-20 mA (Current loop) or RS-485 (Modbus RTU) | | **Accuracy** | ±2% RH; ±0.3°C | | **Load Resistance** | < 500Ω (for 4-20mA output) | --- ### 3. Wiring and Connection Interface The HTS-81-R usually utilizes a terminal block or a circular connector (like M12) for electronic integration: 1. **V+ (Power):** Positive DC voltage input. 2. **V- (GND):** Common ground. 3. **T-Out:** Temperature signal output. 4. **H-Out:** Humidity signal output. 5. **A/B (Optional):** RS-485 communication lines for digital integration. ### 4. Circuit Features * **Drift Compensation:** The internal firmware compensates for "aging" of the humidity sensor to prevent measurement drift. * **Fast Response Time:** The electronic interface is optimized for a T90 response time (usually < 15 seconds). * **Enclosure Rating:** The electronics are housed in an IP65 or IP67 rated casing to prevent moisture ingress from shorting the circuit. ---