Relative Humidity, Temperature, Barometric Pressure, and CO2-percentage in Air Probe

In stock (can be backordered)


  • Stainless steel enclosure and filter cap, engineered to shield sensing elements in harsh environments
  • Waterproof protection of internal electronics—only sensor elements are exposed
  • UV-protected and oil-resistant flexible cable
  • Low-power consumption suitable for battery-powered applications
  • Electrical interfaces: SDI-12 (SDI-12 protocol v.1.4), RS-485 (Modbus protocol), UART (Modbus protocol), USB
SKU: 05419980214201-1 Categories: , Tags: , , , , , ,


The robust Evvos RHTP probe combines meteorological grade sensors for barometric pressure, relative humidity, and air temperature measurements. It is designed to provide high-quality environmental data, real-time measurements, and calculation of multiple derivative parameters. The RHTPCO2 version of the probe includes an additional measurement of CO2-percentage (in air) compensated for relative humidity and air temperature.
It is compatible with OneSense Pulse and Voltage and OneSense Environment and Agriculture sensor data acquisition devices.

Relative humidity, temperature, and barometric pressure probe % °C hPa CO2 % Filter Enclosure Connector

SDI-12 Quickstart Guide

Primary parameters

  • Relative humidity
  • Air temperature
  • Barometric pressure
  • CO2-percentage in air

Typical Applications

  • Environmental monitoring
  • Weather forecasting solutions
  • Industrial data acquisition
  • Precision agriculture/farming
  • Cold chain and HVAC applications
  • Internet of Things (IoT)

Secondary parameters

  • Absolute humidity
  • Dew point
  • Wet-bulb temperature
  • Vapour pressure
  • Saturated vapour pressure
  • Atmospheric pressure at sea level
  • Heat index
  • Mixing ratio
  • Specific enthalpy
  • Boiling point of water
  • Speed of sound in air
  • Water activity in air

Additional information

Weight0.250 kg

250 g


18 x 155 mm


The 1.5 m. (5,9ft), 5-position, PUR halogen-free, black-gray RAL 7021, free cable end, on socket straight M-12, A-coded sensor
cable is suitable for RHTP versions with SDI-12, single-wire, and UART interfaces. Custom cable length on request.

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