Advanced Environmental Probes

Designed to measure relative humidity, air temperature, and barometric pressure.

Our Probes and Accessories

Modbus over RS485 or UART Humidity, Temperature, and Barometric Pressure Probes

Multi-parameter, high-accuracy digital probes with low power draw, flexible electrical interfaces, and wide-range power compatibility—making them suitable for battery-powered dataloggers and industrial DAQ systems.

SDI-12 Humidity, Temperature, and Barometric Pressure Probes

Compact, multi-parameter digital probe measuring relative humidity, air temperature and barometric pressure and computing secondary values such as dew point, absolute humidity, heat index and more.

Built for long-term outdoor/industrial use, with stainless‑steel enclosure and filter, resin-sealed electronics and on‑board heater.

Accessories - Outside Air Humidity Radiation Shield, and Probe Cables

Protect your probes from solar radiation and precipitation for more accurate air temperature and humidity readings.

Rugged, UV‑resistant cable assemblies with M12 connectors to ensure reliable signal and power delivery in field and industrial installations. Multiple lengths available for easy integration with dataloggers.

Primary Parameters

Relative humidity

Air temperature

Barometric Pressure

Secondary Parameter

Dew point

Absolute humidity

Wet-bulb temperature

Water activity in air

Vapor pressure

Saturated vapor pressure

Atmospheric pressure at sea level

Boiling point of water

Heat index

Mixing ratio

Specific enthalpy

Speed of sound in air

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Humidity, Temperature, and Barometric Pressure Probe Highlights

Stainless steel enclosure and filter cap engineered to shield sensing elements in harsh environments
Waterproof protection, and internal electronics sealed in resin, coated electrical parts
Low-power consumption suitable for battery-powered applications
On-board heater to remove condensation from the humidity sensor
Extensive command sets for operational options and probe diagnostics
User-defined multipoint calibration for each of the primary parameters
UV-protected and oil-resistant flexible cable (optional)

Automatic Statistical Logging

Our probes provide continuous environmental statistics collection during uninterrupted power periods. EVVOS HTP continuously updates a set of basic statistical values for every primary and secondary parameter while the unit remains powered. Each statistical record includes minimum, maximum, first, and last measured values, plus the total count of measurements processed. Records update automatically with each new measurement (max sample count: 999,999). Data accumulation resets after power-up. Readouts and manual control of per-parameter statistics are available via protocol commands. For more information, please refer to the User's Manual.