Products / Outdoor Temperature & Humidity Sensor

Outdoor Temperature & Humidity Sensor

The louvred-screen (Stevenson screen) temperature and humidity sensor provides a calibrated digital output. It applies industrial CMOS process micromachining technology to ensure high reliability and excellent long-term stability. The sensor combines a capacitive polymer humidity element and a band-gap temperature element with a 14-bit A/D converter and serial interface circuit on the same chip, and each unit is calibrated in a humidity calibration chamber. It offers excellent quality, fast response, strong interference immunity and high cost-effectiveness, and is widely used in meteorology, marine, environmental, airport, port, laboratory, agricultural and transport applications.

Outdoor temperature and humidity sensor

Key Features

  • Calibrated digital output, factory-trimmed for humidity
  • Capacitive polymer humidity element with excellent long-term stability
  • Band-gap temperature element with 14-bit A/D resolution
  • Louvred radiation screen protects the sensing element from direct sunlight and rain
  • Fast response and strong anti-interference capability
  • Multiple output options: 4–20 mA, 0–2.5 V, 0–5 V, RS232, RS485

Applications

  • Meteorology and hydrology stations
  • Environmental and air-quality monitoring
  • Airports and ports
  • Laboratories and industrial/agricultural facilities
  • Transport infrastructure and structural monitoring

Specifications

ParameterValue
Measurement
Measured parametersTemperature and relative humidity
Temperature range−50 to +100 °C
Temperature accuracy±0.5 °C
Temperature resolution0.1 °C
Humidity range0 – 100 %RH
Humidity accuracy±5 %RH
Humidity resolution0.1 %RH
Electrical output
Power supplyDC 12 V or DC 24 V (other voltages available on request)
Output — current4–20 mA (load resistance RL ≤ 300 Ω)
Output — voltage0–2.5 V or 0–5 V (load resistance RL ≥ 1 kΩ)
Output — digitalRS232 or RS485 (other interfaces available on request)
Operating temperature−50 to +80 °C; 0 – 100 %RH
Wiring
RedPower positive (all output types)
BlackPower ground (all output types)
YellowTemperature signal / A+ (TX) on communication types
BlueHumidity signal / B− (RX) on communication types
GreenAir pressure signal (pressure version)
Communication
ProtocolMODBUS-RTU
Serial format8 data bits, 1 or 2 stop bits, no parity
Baud rate9,600 bps
Minimum interval between transactions1,000 ms

Installation notes

The sensing element must not be exposed to direct sunlight or driving rain; the louvred screen provides the required radiation shield.

Do not wire the sensor while power is applied. Verify all connections before switching on.

The sensor is a precision device — do not dismantle it or allow sharp objects or corrosive liquids to contact the sensing surface.

Keep the calibration certificate for service; return it with the unit if repair is required.

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Outdoor temperature and humidity sensor and dimensions Outdoor temperature and humidity sensor and dimensions

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