Questions about our products?

EE800 measures accurately CO2, temperature (T) and relative humidity (RH) in HVAC applications. Additionally, it calculates the dewpoint temperature (Td).

The E+E dual wavelength NDIR CO2 sensor compensates for aging effects, is highly insensitive to pollution and offers outstanding long term stability. A multiple point CO2 and T factory adjustment leads to excellent CO2 measurement accuracy over the entire T working range.

EE800 with analogue outputs features an optional passive T sensor, while EE800 with digital interface (Modbus RTU or BACnet MS/TP) calculates additional physical quantities: absolute humidity, mixing ratio, enthalpy, frost point temperature and water vapor partial pressure.

Key Features

  • CO2, T, RH/Td in one room transmitter
  • BACnet, Modbus or analogue outputs
  • Optional passive temperature sensor
  • Auto-calibration for excellent long term stability
  • Temperature compensation
  • Highly insensitive to pollution
  • Snap-on enclosure for easy installation
  • Optional display
  • Easy user configuration and adjustment


  • Demand controlled ventilation
  • Heating, ventilation and air conditioning
  • Building automation

Technical data

  • 0...2000 ppm
    0...5000 ppm

    Working range CO2
  • < ±(50ppm + 2% of measuring value)
    < ±(50ppm + 3% of measuring value)

    Accuracy CO2
  • 10...90 % RH

    Working range Humidity
  • ±3 % RH (30...70 % RH)
    ±5 % (10...90 % RH)

    Accuracy Humidity
  • -20...60 °C (-4...140 °F)

    Working range Temperature
  • ±0.3 °C (±0.54 °F) voltage output
    ±0.7 °C (±1.26 °F) current output

    Accuracy Temperature
  • -30...55 °C (-22...131 °F)

    Working range Dewpoint
  • < ±2 °C (3.6 °F) for /T/ - /Td/ < 25 °C (45 °F)
    < ±3 °C (5.4 °F) for /T/ - /Td/ < 30 °C (54 °F)

    Accuracy Dewpoint
  • 0-5 V,0-10 V or 4-20 mA

    Output analogue
  • Modbus RTU or BACnet MS/TP

    Output digital
  • 24 V AC/DC


Product inquiry

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  • What is the difference between Modbus RTU and Modbus TCP/IP?

    The main difference is the hardware interface. The Modbus RTU protocol runs on RS485 Hardware while Modbus TCP/IP protocol on Ethernet hardware.

  • What is the difference between a BTL listed and a non-listed BACnet product.

    All BACnet products are tested at E+E. The BTL listed E+E products have been additionally tested by the BACnet Testing Laboratories.

  • How can I clean the CO2 sensing cell?

    Not at all. Do not temper in any way with the CO2 sensing cell. Please see the operation manual of the specific E+E CO2 measurement device.

  • How can I replace the CO2 sensing element?

    Not at all. Do not temper in any way with the CO2 sensing cell. Please see the operation manual of the specific E+E CO2 measurement device.

  • Which E+E CO2 sensors feature auto-calibration function?

    All E+E CO2 measuring devices feature an auto-calibration function. For details please refer to "Princibles of CO2 measurement".

  • My CO2 sensor shows temporary values lower than 400 ppm. Is this normal?

    Yes, this in normal in several applications. It is the case for instance in new concrete buildings, due to the concrete carbonation effect. The calcium in the new concrete binds CO2 from the air.

  • What calibration certificate is included in the standard scope of supply of the E+E CO2 sensors?

    The standard scope of supply of E+E CO2 sensors includes an inspection certificate according DIN EN 10204 - 2.2. For details on calibration certificates please see our white paper "Calibration and Traceability in Measuring Technology".

  • Can E+E supply an accredited calibration certificate with the CO2 sensor?

    Accredited calibration certificate for CO2 is available upon request, please see our calibration website.

  • 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.