Relative Humidity, Temperature, and Barometric Pressure Probe SDI-12, Modbus/RS-485 Interface, or NMEA-0183 over RS422

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

Primary parameters

  • Relative humidity
  • Air temperature
  • Barometric pressure

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
SKU: SN-ERHTP-X0 Categories: , Tags: , , , , , , , , , ,


The Evvos RHTP stands out as a robust and resilient, high-precision digital probe, proficient in measuring various environmental parameters. Thanks to its low power consumption, versatile electrical interface options, and wide power supply range, this probe seamlessly integrates with an array of battery-operated data loggers and industrial data acquisition systems. Crafted with a stainless-steel enclosure, weather-resistant electronic circuitry, and an optional durable cable, it ensures sustained performance, even when exposed to challenging outdoor and industrial environments. All primary parameters are directly sensed by physical sensors, while secondary parameters are derived from measurements acquired by the probe’s physical sensors.
The enhanced accuracy variant of this probe offers high accuracy measurements of relative humidity and air temperature without necessitating user-defined calibration. It effortlessly interfaces with OneSense Pulse and Voltage, OneSense Environment and Agriculture, and a plethora of other telemetry transmitters or data loggers that support SDI-12, Modbus/RS-485, or NMEA 0183 interfaces.

Typical Applications

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

Electrical Interfacing Options

  • SDI-12 (v.1.4, user-selectable 3V/5V logic levels)
  • Modbus/RS485
  • NMEA 083 over RS422

Additional information

Weight0.151 kg

18 x 155 mm


A 1.5 m. (5,9ft), 5-position (SDI-12) or 4-position (Modbus/RS-485, or NMEA-0183), PUR halogen-free, black-gray RAL 7021, free cable end, on socket straight or angled M-12, A-coded sensor cable. Custom cable length on request.

Electrical Interface

SDI-12, Modbus/RS-485, NMEA 0183 over RS422


User's Manual

SDI-12 –
Modbus/RS-485 –
NMEA 0183 Interface TALKER rev.1.0 –

SDI-12 Quickstart Guide

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