SHT20 MD02 RS485 Temperature Sensor

Specifications

• Product Name: SHT20 MD02 RS485 Temperature & Humidity Sensor

• Model Number: MD02-RS485-SHT20

• Sensor Type: Digital temperature and humidity sensor with RS485 MODBUS RTU communication

• Sensing Elements: SHT20 (from Sensirion – high-accuracy digital sensor)

• Output Interface: RS485 (MODBUS RTU Protocol)

• Power Supply: DC 5V – 30V

• Mounting Type: Wall-mounted / probe-mounted / duct-type (depending on version)

Measurement Specifications

Temperature Measurement

• Measuring Range: -40°C to +80°C

• Accuracy: ±0.3°C (typical at 25°C)

• Resolution: 0.1°C

• Response Time: ≤5s (airflow dependent)

Humidity Measurement

• Measuring Range: 0% RH to 100% RH

• Accuracy: ±3% RH (20% RH to 80% RH, typical)

• Resolution: 0.1% RH

• Response Time: ≤8s

Electrical Specifications

• Supply Voltage: 5V to 30V DC (wide range)

• Working Current: ≤10mA (standby), ≤30mA (active)

• Interface: RS485 (Modbus RTU)

• Baud Rate (Default): 9600 bps (Configurable to 2400 / 4800 / 19200)

• Protocol Standard: Modbus RTU

• Device Address: Default 01 (Configurable)

• Parity: None / Even / Odd (Configurable)

• Data Format: 8 data bits, 1 stop bit

Build & Materials

• Sensor Chip: Sensirion SHT20

• Enclosure Material: Industrial-grade ABS / PC plastic

• Enclosure Type: Ventilated housing for accurate air measurements

• Protection Grade: IP65 (with waterproof enclosure)

• Mounting Holes: 4mm diameter

• Dimensions:

  • Main Body: Approx. 65mm × 55mm × 27mm

  • Probe (if applicable): Length 50–80mm, diameter ~12mm

• Weight: ~100g (depends on version)

Environmental & Durability Ratings

• Operating Temperature: -40°C to +80°C

• Storage Temperature: -45°C to +85°C

• Operating Humidity: 0% to 100% RH (non-condensing)

• Long-Term Stability:

  • Temperature Drift: <0.02°C/year

  • Humidity Drift: <0.25% RH/year

• Protection:

  • Reverse polarity protection

  • TVS (Transient Voltage Suppression) for RS485

  • ESD and surge protection on data lines

Wiring & Communication

Wiring (Standard 4-wire RS485)

Modbus Registers (Example)

Applications

• HVAC (Heating, Ventilation & Air Conditioning)

• Greenhouses and Agriculture

• Cold Chain Monitoring

• Smart Buildings and Automation

• Server Room / Data Center Monitoring

• Warehouse Environmental Monitoring

• Industrial Process Control

• Environmental Monitoring Systems

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