The **HTS-61-R** is a specific model of a **Humidity and Temperature Sensor** (often part of a transmitter series) used extensively in industrial automation, HVAC systems, and environmental monitoring. Below is a breakdown of its electronic components, technical specifications, and wiring structure. --- ### 1. Key Technical Specifications The HTS-61-R is designed to convert physical environmental changes into measurable electrical signals. | Feature | Specification | | :--- | :--- | | **Measured Parameters** | Relative Humidity (RH) and Temperature (T) | | **Output Signal** | Relay Output (High/Low Alarms) or 4-20mA / 0-10V (Model dependent) | | **Power Supply** | Usually 12-24V DC or 110-220V AC | | **Temperature Range** | -20°C to +80°C (Standard) | | **Humidity Range** | 0% to 100% RH | | **Accuracy** | ±3% RH / ±0.5°C | --- ### 2. Internal Electronic Architecture The device consists of four primary electronic stages: 1. **Sensing Element:** * **Humidity:** Typically uses a *Capacitive Polymer Sensor*. As moisture increases, the dielectric constant changes, altering the capacitance. * **Temperature:** Usually a *PT100/PT1000 RTD* or a high-precision *Thermistor* for linear resistance response. 2. **Signal Conditioning Circuit:** * Uses Operational Amplifiers (Op-Amps) to amplify the tiny millivolt or picofarad changes from the sensors into a stable voltage. 3. **Microcontroller (MCU):** * Processes the analog signals using an Analog-to-Digital Converter (ADC). * Applies calibration algorithms to ensure linearity across the full range. 4. **Output Stage (The "R" Suffix):** * The **"R"** usually signifies a **Relay Output**. * It contains an electromechanical or solid-state relay that triggers an external circuit (like a fan or heater) when a specific threshold is reached. --- ### 3. Wiring and Connection Diagram Typical electronic connections for the HTS-61-R involve a terminal block with the following configuration: ```yaml Terminal 1: V+ (Power Supply Positive) Terminal 2: V- (Power Supply Ground) Terminal 3: Relay Common (COM) Terminal 4: Relay Normally Open (NO) Terminal 5: Relay Normally Closed (NC) ``` --- ### 4. Typical Applications * **Greenhouse Control:** Activating irrigation or ventilation based on humidity levels. * **Server Rooms:** Triggering alarms if the cooling system fails and temperature rises. * **Grain Storage:** Monitoring moisture content to prevent spoilage.