EE300Ex - Intrinsically Safe Humidity & Temperature Transmitter for Hazardous Areas

Reliable Measurement in Gas and Dust Hazardous Areas

The EE300Ex transmitter can be employed in the highest hazard zones and is certified according to the following international standards for intrinsically safe equipment:

  ATEX (Europe)
  IECEx (International)
  FM Approvals (USA / Canada)
TIIS (Japan)



FM-Certificate (USA)

TEKHNE Trading Co., Ltd.


FM-Certificate (CAN)


The EE300Ex is therefore the ideal RH and T transmitter for demanding applications, such as in the petrochemical or pharmaceutical industry. Other typical applications are potentially explosive storage roomsgrain millspower stationspaint booths and offshore platforms.

  • Industrial plant
  • Chemical production facility
  • Spray booth
  • Gas tanks
  • Oil platform
  • Power plant

Various Models for Specific Applications

Choose the EE300Ex model that suits your measurement task:

Humidity and Temperature

The EE300Ex-HT measures reliably in the range 0…100% RH and -40…180°C (-40...356 °F) at process pressure between 0.01 and 300 bar (4351 psi). The remote probe version is certified for T6 class.

Datasheet EE300Ex-HT


Moisture in Oil

EE300Ex is ideal for monitoring of moisture in insulation, lubrication, hydraulic and other oils, as well as in diesel fuel. It measures directly water activity (aw) and T and calculates the absolute moisture content (x) in ppm. 

Datasheet EE300Ex-HT


EE300Ex-xT measures accurately the temperature in the range -70…200°C (-94...392 °F) and is pressure rated up to 20 bar (290 psi). 

Datasheet EE300Ex-xT

Easy Installation

The Two-Part Enclosure

The stainless steel enclosure consists of a connection and measurement unit. This simplifies considerably the installation of the transmitter and allows for easy replacement of the measurement unit – for calibration or service purposes– without time-consuming re-wiring.

EE300EX employs the 2-wire technology and must be loop-powered by an intrinsically safe supply unit. The two 4...20 mA outputs can be easily configured by the user.


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Maximum Flexibility

Various models and options enable the EE300Ex to meet specific application requirements.



EE300Ex for wall mounting

Wall Mount

The compact EE300Ex model can be employed directly in zone 0/20. The external fixing holes and the two-part enclosure allow for easy installation.

EE300Ex with remote sensing probe

Remote Sensing Probe

EE300EX with remote probe version achieves the T6 temperature class. The probe cable is available in lengths of 1 m, 2 m, 5 m and 10 m.

EE300Ex with optional display

Optional Display

With the optional display the measured values are available on site. The displayed physical quantities can be selected with push buttons on the front cover of EE300EX.

Designed for Demanding Industrial Applications

Robust Stainless Steel Enclosure

With high-quality stainless steel enclosure and probe, EE300Ex fulfills the requirements of food, pharmaceutical and petrochemical industries, and is also appropriate for harsh industrial environment.


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Pressure Rating up to 300 bar (4351 psi)

Several remote sensing probes with cable lengths from 1 m to 10 m are available for the EE300Ex to suit different pressure ranges and mounting options.

Probes for Ball Valve Mounting up to 20 bar (290 psi)

Ball Valve Mounting up to 20 bar (290 psi)

The sliding fitting of the probe enables easy mounting with a ball valve.

EE300Ex Probe in Retraction Tool

Retraction Tool up to 250 bar (3626 psi)

The probe can be installed and removed under pressure using a special retraction tool.

EE300Ex Probe with Cut-in Fitting

Direct Pipe Mounting up to 300 bar (4351 psi)

The probe with cut-in fitting can be installed directly in the pipeline.

Technical Data EE300Ex Humidity and Temperature Transmitter

Measuring ValuesEE300Ex-HTEE300Ex-xT
Relative humidity
Measuring range0...100 % RH-
Accuracy±1.3 % RH-
Measuring range sensor head (wall mounting)-40...60 °C (-40...140 °F)-40...60 °C (-40...140 °F)
Measuring range sensor head (remote probe)-40...180 °C (-40...356 °F)-70...200 °C (-94...392 °F)
Accuracy±0,2 °C±0,2 °C  
Calculation functions
Dew/Frost point temp. [Td/Tf] -
Wet bulb temperature [Tw] -
Water vapour pressure [e] -
Mixing ratio [r] -
Absolute humidity [dv] -
Specific enthalpy [H] -
Water activity [aw] -
Water content [x] -
Scalable analogue outputs2x 4-20 mA (2-wire)1x 4-20 mA (2-wire)
Supply voltage (Class III)24 V DC24 V DC
Current consumptionmax. 20 mA per channelmax. 20 mA
Protection class of housingIP65 / Nema 4IP65 / Nema 4


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Datasheet EE300Ex-HT

Datasheet EE300Ex-xT

E+E Humidity Sensor with Protective Coating

For Outstanding Long-term Stability

The optional E+E proprietary coating protects the sensing elements, which grants EE300EX outstanding long-term stability in heavily contaminated and/or corrosive environment.

E+E has been developing and manufacturing in-house humidity sensing elements for over 25 years. The high level of expertise in the field of thin-film technology combined with state-of-the-art production processes lead to accurate and reliable sensors for demanding applications.

Mounting Examples

EE300Ex - Technical Drawing for Wall Mounting

EE300Ex Wall Mount

The compact EE300Ex version (without display) can be employed in zone 0/20.

EE300Ex - Technical Drawing for Mounting with Remote Sensing Probe

EE300Ex with Remote Probe

The EE300Ex display unit can be mounted in Zone 1/21 or 2/22, while the remote probe can be installed in Zone 0/20.

  • E+E Elektronik Headquarters
    E+E Elektronik Headquarters, Engerwitzdorf/ Austria.

E+E Elektronik - Your Partner in Sensor Technology

Since more than 20 years, E+E Elektronik develops and manufactures sensors and transmitters for humidity, temperature, dew point, moisture in oil, air velocity, mass flow, CO2 and pressure.

The main applications for E+E products lie in HVAC, building automation, industrial process control and the automotive industry.

A certified quality management system according to ISO 9001 and IATF 16949 ensures the highest quality standards.

E+E Elektronik has a worldwide dealership network and representative offices in Germany, France, Italy, Korea, China and the United States.

The accredited E+E calibration laboratory (OEKD) has been commissioned by the Austrian Federal Office for Metrology (BEV) to provide the national standards for humidity and air velocity.