Industrial humidity and temperature transmitter for permanent high-humidity and polluted environment

EE33 is optimised for reliable humidity and temperature measurement in applications with temporary condensation, permanent high humidity or chemical exposure. Condensation on the monolithic humidity sensor and the filter cap is prevented by controlled heating of the sensor.

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The measuring principle of EE33-T17 with separate humidity and temperature probes and dual heating enables precise continuous measurement even at permanent high humidity.

The remote probe can be employed up to 180°C (356°F) and the pressure tight version up to 100bar. The three-part design of rugged enclosure in polycarbonate or aluminium allows easy mounting and replacement. The measurands are available on two analogue outputs and a serial interface.

An optional relay output can be used for alarms and process control. The proprietary coating protects the sensors and their leads against corrosive and electrically conductive pollution.

Typical applications

  • pharmaceutical and food industry
  • driers for ceramics, wood, concrete, polyester etc.
  • greenhouses, mushroom farms
  • high-humidity storage rooms
  • climate, test and curing chambers
  • meteorology

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Key Features EE33

  • Highest measurement accuracy with monolithic humidity sensor
  • Heating modes for temporary condensation, permanent high humidity or chemical exposure
  • Optional module for external triggering of heating mode
  • Short response time and fast recovery after condensing conditions
  • Precise measurement at permanent high humidity
  • Outstanding temperature compensation
  • Sensor protection against pollution and corrosion
  • Rugged aluminium enclosure
  • Pressure tight probe up to 100 bar
  • Process temperature up to 180°C
  • Analogue current and voltage outputs
  • Optional RS-485 and standard RS-232 interface
  • Optional alarm outputs
  • Optional LCD Display
  • Additional physical quantitites calculated
  • Easy field adjustment
  • Outputs freely configurable by user
  • Dew point only type available

Technical data EE33

  • 0...100% RH
    -40...180°C (-40...356 °F)

    Measuring range
  • ±1.3% RH
    ±0.2 °C (0.36 °F)

  • < 15s

    Response time
  • RS232C + optional RS485

    Serial interface
  • 0-1/5/10 V or 0/4-20 mA

  • 24V AC/DC


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EE33 Accessoires

  • HA010114

    PTFE stainless steel filter


    Material: stainless steel
    Filter: PTFE memrane, replaceable
    Pores size: 2 µm
    Length: 39mm (1.54")


    For average mechanical stress
    High pollution levels

    T range: -40…180°C (-40...176°F)Response time t10/90: 14sWater ingression pressure > 0.5bar

    Typical applications

    Continuous high humidity
    Condensing environment

    For EE33-J and EE33-K in:


    Suitable for Products:

  • HA010105

    PTFE Filter


    Material: PTFE sintered
    Pores size: 50 µm
    Length: 33mm (1.30")


    For very dirty, oily environment

    T range: -40...180°C (-40...176°F)
    Response time t10/90: 14s

    Typical applications

    Industrial process control
    Chemical industry
    Very polluted environment
    Unsuitable for condensing environment


    Suitable for Products:

  • HA010603

    RS232 to RS485 Converter


    • Converter from RS232 to RS485
    • Supports AutoPro, i.e. automaticadjustement of the Baudrate from300 bps to 115200 bps
    • Enables to control 256 data acquisitionmodules in a RS-485 network
    • Solation 3000 Vrms

    Suitable for Products:

  • HA010301

    RS232 Interface Cable for Screw Terminals


    • RS232 interface cable for connection to screw terminals on the board
    • cable length: 2m (6.6ft)

    Suitable for Products:

  • HA010304

    RS232 Interface Cable with Pin Connector


    • RS232 interface cable to connect directly on the board
    • cable length: 2m (6.6ft)

    Suitable for Products:

  • HA010311

    RS232 Interface Cable with External Plug


    • RS232 interface cable to plug into theexternal socket on the housing C06
    • cable length: 2m (6.6ft)

    Suitable for Products:


  • What is the difference between a 2 wire and a 3 wire current output?

    Transmitter with "two-wires" technology receive the power from the process, and the signal is carry on return wire (closed current loop). With technology "three-wires" the power supply is separate from current output: 2 wires are the power supply and third carry the signal.

  • How often should I calibrate or readjust my E+E RH measuring device?

    The calibration / adjustement interval depend from the application and from the requirements of the specific industry. See also "Princibles of Humidity measurement".

  • Can E+E supply an accredited calibration certificate together with the measurement device?

    The product data sheet indicates if and what type of inspection certificate is included in to standard scope of supply. Most of the E+E measurement devices feature an inspection certificate according to DIN EN 10204-3.1 or DIN EN 10204-2.2. An accredited calibration certificate is available on request, see the E+E scope of accreditation at our calibration website

  • The probe of the RH sensor is installed into separation wall and seems to be out of specs. Why?

    Temperature gradients along the sensing probes lead to relevant measurement errors. Whenever possible, install the entire probe inside the space to be monitored. If the probe is installed into a separation wall, make sure to isolate thermally the part of the probe looking out of the wall at the cable side.

  • What is the influence of coating on the response time?

    Response time of a humidity sensor protected by the E+E proprietary coating is slightly longer than the response time without coating. Please see the data sheet of the specific sensor.

  • When does coating not help?

    Coating does not help again chemicals in gazeous form. Contact an E+E sales representative for details on the influence of certain chemicals onto the humidity sensing elements.

  • When does coating help?

    The E+E propritary Coating helps in dirty, dusty and corrosive environment. salts, off-shore applications). It improves the sensor’s long term stability in dusty, dirty or oily applications by preventing stray impedances caused by deposits on the active sensor surface and on its connecting leads.

  • What is the E+E sensor coating?

    The E+E proprietary sensor coating is a protective layer applied to the active surface and leads of the sensing elements. The coating extends the lifetime and the measurement performance of the E+E sensor.

  • How can I clean the filter cap of a humidity measuring device?

    How can I clean the filter cap of a humidity measuring device?

  • How can I clean the humidity sensing element?

  • Which E+E products are appropriate for high dew point measurement?

    High dew point means the difference between the ambient temperature and the dew point temperature is lower than 3 °C. It corresponds to RH > 85%.

    The appropriate product is the EE33-K. The device features a heated sensing element.

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