Humidity and Temperature Sensor for High Humidity and Chemically Polluted Conditions

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  • Service
  • Humidity
  • Temperature


The HTS801 is designed to meet the highest demands for long-term stable and accurate relative humidity (RH) and temperature (T) measurements in environments with constant high humidity and chemical contamination. The sensor is suitable for a wide range of applications from -80 °C to 180 °C (-112 °F to 356 °F) and 300 bar (4 351 psi) and masters even the most challenging measuring conditions.

The HTS801 with probe type T28 is also an ideal solution for demanding meteorological measurement tasks. The special probe design allows for easy integration and best fit in high-end radiation shields.

  • HTS801 humidity and temperature sensor with 3.5" TFT display

  • HTS801 humidity and temperature sensor - polycarbonate enclosure

  • HTS801 humidity and temperature sensor - stainless steel enclosure

  • HTS801 with T28 probes for meteorological applications

  • Extended warranty option available!

    Outstanding Measurement Performance
    The heated high-end E+E humidity and temperature sensing element enables reliable and long-term stable measurement in extremely humid or chemically polluted environment. The monolithic structure of the RH / T sensing element, protected by the E+E proprietary coating, allows for fast return to normal conditions after condensation or chemical contamination.

    Versatile and Robust
    Six HTS801 versions are available with several probe and cable lengths. With different heating modes, the HTS801 can be perfectly tailored to the specific needs of each measurement task. It features an IP65 / NEMA 4X polycarbonate or stainless-steel enclosure which can accommodate various interface modules and electrical connection options.

    rapidX Smart Probes
    The HTS801 allows the use of intelligent pluggable rapidX probes, for quick and easy plug-and-play probe exchange. Any HTS801 rapidX smart probe automatically uploads its specific parameters upon connecting it to the HTS801 electronics and can be replaced even during operation without any configuration, adjustment or calibration. This is particularly useful for excluding down time and its corresponding costs in harsh industrial environment, where the probe can get occasionally damaged.

    Outputs and Configuration
    The measured data is available on two freely scalable analogue outputs, on the RS485 (Modbus RTU) or Ethernet-PoE (Modbus TCP) interface and on the alarm (relay) outputs. The configuration and the RH and T adjustment of the HTS801 can be performed with the free PCS10 Product Configuration Software. An optional 3.5" colour display with push-buttons is available for configuration and visualisation.

    Typical Applications

    • Drying Processes for brick, ceramics, wood, concrete, polyester etc.
    • High-humidity storage rooms
    • Climate, test and curing chambers
    • Meteorology measurement for NMI‘s and ice-warning systems
    • Fuel cell and automotive test benches
    • Pharmaceutical and chemical applications

    Extend Your Warranty Up to 5 Years with the E+E Service and Calibration Packages

    Our service and calibration packages ensure that you are on the safe side when it comes to the accuracy and availability of your measuring devices. Choose the right service package for your E+E product and benefit from professional device service, calculable costs and excellent measuring accuracy in the long-term. Here you can find more detailed information.

    Extended warranty option available!

    Key Features

    • Highest measurement accuracy
    • High-end monolithic RH/T sensing element
    • Wide working range from -80 °C to 180 °C (-112 °F to 356 °F)
    • Pressure-tight probe up to 300 bar (4 351 psi)
    • Heating modes for temporary condensation or permanent high humidity
    • Automatic ReCovery (ARC) function to remove chemical pollution
    • E+E proprietary coating for excellent long-term stability under harsh conditions
    • rapidX smart probe with included sensing element data
    • 3.5“ TFT colour display with push buttons and logging function
    • Two analogue current and voltage outputs
    • Error indication according to NAMUR
    • RS485 (Modbus RTU) or Ethernet-PoE (Modbus TCP) interface
    • Two alarm (relay) outputs
    • IP65 / NEMA 4X polycarbonate or stainless-steel enclosure
    • Calculation of all humidity related physical quantities
    HTS801 features

    Technical data

    Measuring range
    0...100 % RH
    -80...180 °C (-112...356 °F)
    ±0.95 % RH
    ±0.1 °C (0.34 °F)
    Pressure range
    Up to 300 bar (4 351 psi)
    Digital interface
    RS485 with Modbus RTU
    Ethernet-PoE with Modbus TCP
    0-1/5/10 V
    0/4-20 mA

    24 V AC/DC

    Calibrating your limits

    Your products and services can only be as precise as the tools you use to measure them. With more than 20 years of experience, the calibration team of E+E Elektronik focuses on providing a reliable service without any unnecessary delays or bias.

    Discover the value of working with an expert in calibration that prioritizes

    • accuracy,
    • fastness and
    • reliability

    Learn more

    Related products



    Downloads HTS801


    Use the RS485 kit for retrofitting (order number HA010605), see the data sheet and user manual of your specific E+E product.

    The device indicates an error according to NAMUR NE43. For details, please see the user manual of your specific E+E product.

    The device has one GND connection for the power supply, an analogue output GND and an interface GND, see connection diagram in the user manual. The analogue output GND and the interface GND carry only the current output resp. interface current, which results in a more stable signal compared to a mix GND connection.

    Press 2x ► | 5x ◄ | 1x ▲ | 3x ◄ | 1x ▼ | 1x ► then select the "Configuration menu" and press ENTER. Scroll down to “Diagnosis”, press ENTER and scroll down to “Password protection” here you can see the previously set password.

    Connect the device via the USB service interface to a PC running PCS10 Product Configuration Software and read out the communication setting.

    Alternative for device with display: the display configuration menu has a section for Modbus settings (RS485, Modbus RTU) or IP settings (Ethernet, Modbus TCP) where you can see the actual setting or change it.

    Connect the device via the USB service interface to a PC running PCS10 Product Configuration Software and see at the section "Log data download" for the data memory status.

    Remote probe types can be retrofitted with an Ethernet interface using HA010606, see data sheet and operation manual of your specific E+E product.

    The measured data logged by the device can only be downloaded via the USB service interface to a PC running the PCS10 Product Configuration Software.

    High dew point means the difference between the ambient temperature and the dew point temperature is lower than 3 °C (5,4 °F), which corresponds to RH >85 %.

    The appropriate product is the HTS801-M4T7. The device features a heated sensing element and probe body (dual heating system).

    Due to the direct contact of the HTS801 sensor element with the measurement medium, chemical contaminants (e.g. VOCs / vapors) can penetrate the sensor polymer and cause drift effects.
    Automatic ReCovery (ARC) is used to remove this chemical contamination and thus eliminate possible drift effects of the RH /T sensing element. This is accomplished by intense heating of the sensing element.

    Deviations due to chemical contamination and how fast they occur depend mainly on the concentration of the chemicals, the duration of the contamination, the temperature, and the type of chemicals.
    The ARC trigger interval must be determined according to the drift response time and tolerable measurement errors. As a starting point, it is recommended that ARC be triggered every 24 hours. From there, the intervals can be optimized in a range from 1 hour to once per week. Additionally using the ARC module or Modbus commands the function can be triggered at or after a certain process step.

    No. For low Dew Point measurement EE355 / EE371 are the right products, which have an auto-calibration function to ensure ±2 °C Td accuracy. The HTS801 calculates the Td values down to -80 °C according to its possible temperature range and is able to scale its analogue outputs accordingly. The HTS801 Td accuracy results from its RH and T accuracy at the operating point. The E+E Humidity calculator helps to determine the Td accuracy.

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