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 is a robust, high-accuracy, digital probe. It measures multiple environmental parameters. Due to its low power consumption, versatile electrical interfacing options, and wide power supply range, the probe is compatible with a variety of battery-operated dataloggers and industrial data acquisition systems. A stainless-steel enclosure in combination with weatherproof electronic circuitries, and durable cable, ensure proper long-term operation even in harsh outdoor and industrial conditions. All primary parameters are sensed by physical sensors. The secondary parameters are calculated, based on values measured by the probe’s physical sensors.
The enhanced accuracy version of the probe provides high accuracy measurement of relative humidity and air temperature without user-defined calibration.
It is compatible with OneSense Pulse and Voltage and OneSense Environment and Agriculture as well as many other telemetry transmitters or dataloggers supporting SDI-12, Modbus/RS-485, or NMEA 0183 inerface.

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


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.

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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