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:

1. Measurement Range:
   • Temperature: -40°C ~ 80°C (some models up to -50°C ~ 125°C)
   • Humidity: 0%RH ~ 100%RH (non-condensing)
2. Accuracy:
   • Temperature: ±0.5°C (at 25°C)
   • Humidity: ±3%RH (at 20% ~ 80%RH)
3. Output Signals:
   • Digital interfaces: I²C, SPI, or UART (model-dependent)
   • Analog outputs: 0~5V, 4~20mA (supported by some models)
4. Supply Voltage: 3.3V ~ 5V (DC)
5. Power Consumption:
   • Measurement mode: Typical 5mA
   • Standby mode: Typical 10μA
6. Response Time:
   • Temperature: <10 seconds
   • Humidity: <5 seconds (at 1m/s airflow)
7. Package:
   • Plastic housing (IP65 protection) with metal mesh for dust filtration
   • Pin configuration: 4 pins (VCC, GND, DATA, CLK)

Product Features:

1. Wide-Range Adaptability: Supports -40°C ~ 80°C temperature and full humidity range, suitable for harsh environments (e.g., cold storage, greenhouses).
2. High Reliability:
   • Built-in anti-condensation algorithm for quick recovery in dew conditions
   • Corrosion-resistant coating to withstand chemical gases (e.g., SO₂, NO₂)
3. Low Power Design: Enables sleep mode, ideal for battery-powered wireless sensor nodes (e.g., LoRa, NB-IoT devices).
4. Easy Integration:
   • Standard digital interfaces compatible with mainstream MCUs (e.g., Arduino, STM32)
   • Open-source drivers and sample codes available (e.g., Python, C)
5. Long-Term Stability: Annual drift <0.5°C (temperature) and <1%RH (humidity), reducing calibration frequency.

Application Fields:

1. Industrial & Agricultural:
   • Workshop climate monitoring, cold chain logistics, agricultural greenhouse automation
2. Smart Home:
   • Smart AC/humidifier (interactive control), indoor air quality monitoring (e.g., with formaldehyde detectors)
3. Medical & Research:
   • Lab incubators, pharmaceutical storage cabinets, weather station data collection
4. Building Automation:
   • HVAC energy-saving control, server room humidity/temperature alert, intelligent building environment management
5. Consumer Electronics:
   • Wearables (e.g., sports watch environmental monitoring), air purifier linkage modules

Installation & Precautions:

1. 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
2. Electrical Connections:
   • I²C interface requires 4.7kΩ pull-up resistors, communication distance ≤20m
   • Analog models need 250Ω precision resistors for voltage signal conversion
3. Environmental Requirements:
   • Avoid strong acids/alkalis or high-dust environments
   • Long-term storage: -40°C ~ 60°C, humidity <80%RH (non-condensing)

Selection Guide:

Yijiajie Electronics is a full range of silicon pressure sensors from the United States, FREESCALE/, GE, MEAS, SMI, and a full range of sensing and control products from the United States pressure, temperature and humidity, gas flow, current, Hall effect, etc., Japan HAMAMATSU flame, UV sensors, photodiodes, Japan FIGARO, UK CITY, ALPHASENSE full range of semiconductors, catalytic, electrochemical gas sensors, French HUMIREL/MEAS humidity sensors and other international well-known companies authorized agents or distributors, to provide customers with product information, products Solutions, product selection, supply guarantee and logistics services, etc.