HTW-211 High-precision Temperature Humidity Sensor
Product Overview:
The HTW-211 is a high-precision temperature and humidity sensor commonly used in environmental monitoring, industrial control, and smart home scenarios. Employing advanced sensing technology combined with digital signal processing, it delivers real-time calibrated temperature and humidity data, featuring fast response and high stability.
Technical Parameters:
- Measurement Range:
- Temperature: -40°C ~ 80°C (some models up to -50°C ~ 125°C)
- Humidity: 0%RH ~ 100%RH (non-condensing)
- Accuracy:
- Temperature: ±0.5°C (at 25°C)
- Humidity: ±3%RH (at 20% ~ 80%RH)
- Output Signals:
- Digital interfaces: I²C, SPI, or UART (model-dependent)
- Analog outputs: 0~5V, 4~20mA (supported by some models)
- Supply Voltage: 3.3V ~ 5V (DC)
- Power Consumption:
- Measurement mode: Typical 5mA
- Standby mode: Typical 10μA
- Response Time:
- Temperature: <10 seconds
- Humidity: <5 seconds (at 1m/s airflow)
- Package:
- Plastic housing (IP65 protection) with metal mesh for dust filtration
- Pin configuration: 4 pins (VCC, GND, DATA, CLK)
Product Features:
- Wide-Range Adaptability: Supports -40°C ~ 80°C temperature and full humidity range, suitable for harsh environments (e.g., cold storage, greenhouses).
- High Reliability:
- Built-in anti-condensation algorithm for quick recovery in dew conditions
- Corrosion-resistant coating to withstand chemical gases (e.g., SO₂, NO₂)
- Low Power Design: Enables sleep mode, ideal for battery-powered wireless sensor nodes (e.g., LoRa, NB-IoT devices).
- Easy Integration:
- Standard digital interfaces compatible with mainstream MCUs (e.g., Arduino, STM32)
- Open-source drivers and sample codes available (e.g., Python, C)
- Long-Term Stability: Annual drift <0.5°C (temperature) and <1%RH (humidity), reducing calibration frequency.
Application Fields:
- Industrial & Agricultural:
- Workshop climate monitoring, cold chain logistics, agricultural greenhouse automation
- Smart Home:
- Smart AC/humidifier (interactive control), indoor air quality monitoring (e.g., with formaldehyde detectors)
- Medical & Research:
- Lab incubators, pharmaceutical storage cabinets, weather station data collection
- Building Automation:
- HVAC energy-saving control, server room humidity/temperature alert, intelligent building environment management
- Consumer Electronics:
- Wearables (e.g., sports watch environmental monitoring), air purifier linkage modules
Installation & Precautions:
- Mounting Methods:
- Wall-mounted, duct-inserted, or direct PCB soldering (refer to specific model specs)
- Avoid heat sources (e.g., heaters, motors) and water, prevent direct sunlight
- Electrical Connections:
- I²C interface requires 4.7kΩ pull-up resistors, communication distance ≤20m
- Analog models need 250Ω precision resistors for voltage signal conversion
- Environmental Requirements:
- Avoid strong acids/alkalis or high-dust environments
- Long-term storage: -40°C ~ 60°C, humidity <80%RH (non-condensing)
Selection Guide:
| Model Suffix | Key Differences | Suitable Scenarios |
| HTW-211-A | Analog output (4~20mA) | Industrial PLC systems, long-distance transmission |
| HTW-211-D | I²C digital interface (standard) | Embedded development, smart home |
| HTW-211-W | Waterproof housing (IP67) | Outdoor weather stations, humid environments |
| HTW-211-L | Low-power design (sleep current <5μA) | Wireless sensors, battery-powered devices |
