The **HTS-30-R** is a specific model of a **Humidity and Temperature Sensor** (often referred to as a "Humidity Transmitter" or "Transducer"). These devices are primarily used in HVAC systems, industrial automation, and environmental monitoring to convert physical atmospheric conditions into measurable electrical signals. --- ### 1. Key Technical Specifications The "30" in the model name often refers to its accuracy class or specific range, while the "R" typically indicates a **Relay** output or a specific **Resistance** characteristic depending on the manufacturer (most commonly associated with brands like Sensirion or generic industrial suppliers). | Parameter | Typical Specification | | :--- | :--- | | **Supply Voltage** | 12V - 24V DC/AC | | **Temperature Range** | -20°C to +80°C | | **Humidity Range** | 0% to 100% RH | | **Output Signals** | 4-20mA, 0-10V, or RS485 (Modbus) | | **Accuracy** | ±3% RH / ±0.5°C | | **Housing Material** | ABS Plastic (IP65 rated) | --- ### 2. Core Electronic Components Inside the HTS-30-R, several critical electronic parts work together to process environmental data: 1. **Sensing Element:** * **Capacitive Humidity Sensor:** Uses a thin film of polymer or metal oxide between two conductive electrodes. As humidity changes, the dielectric constant changes, altering the capacitance. * **NTC Thermistor / RTD:** A resistor that changes its electrical resistance predictably with temperature changes. 2. **Signal Conditioning Circuitry:** * Contains operational amplifiers (**Op-Amps**) to amplify the tiny changes in capacitance or resistance from the sensors into a stable voltage. 3. **Microcontroller (MCU):** * The "brain" of the unit. It performs Analog-to-Digital Conversion (ADC) and applies calibration algorithms to ensure the output is linear and accurate. 4. **Output Driver:** * **Current Loop (4-20mA):** Transmits data over long distances without signal loss due to wire resistance. * **Relay (The "R" Suffix):** If the unit is an "R" model, it likely includes a physical or solid-state relay to trigger an alarm or turn on a fan/dehumidifier when a threshold is reached. --- ### 3. Connection Pinout (Typical) Most HTS-30-R units use a standard 4-terminal or 6-terminal block: ```text Terminal 1: V+ (Power Supply) Terminal 2: GND (Ground/Common) Terminal 3: Temp Output (Signal) Terminal 4: Humid Output (Signal) Terminal 5: Relay COM (Common) - [Specific to R-model] Terminal 6: Relay NO (Normally Open) - [Specific to R-model] ``` --- ### 4. Applications * **Greenhouses:** Controlling misting systems based on RH levels. * **Server Rooms:** Monitoring for condensation or overheating. * **HVAC Systems:** Modulating air dampers to maintain indoor air quality. * **Dry Storage:** Ensuring pharmaceutical or food products stay within a specific moisture range.