The dual wavelength NDIR technology with auto-calibration is particularly long-term stable and insensitive to contamination. A multiple point CO2 and T factory adjustment leads to excellent CO2 measurement accuracy over the entire T working range. The pressure compensation minimizes the impact of altitude and ambient pressure variations onto the CO2 readings.
The measured data, with a range of up to 1% CO2, is available on the I²C or the E2 digital interface. Small dimensions and electrical connection via contact pins, edge card socket or pads facilitate the design-in.
An optional kit for the E2 interface facilitates easy configuration of the module and the adjustment of the CO2, RH, T and p measurement. The CO2 measurement interval can be set according to the application requirements; by this the average current consumption can be reduced to 420 μA, ideal for battery-operated devices.
±(50 ppm +2% of mv)
±(50 ppm +3% of mv)
±(100 ppm +5% of mv)
0…95 % RH (non condensing)Measuring range Relative Humidity
typ. ± 3 % RHAccuracy Relative Humidity at 25 °C (77 °C) and 20...80% RH
700…1100 mbar (10.15...15.95 psi)Measuring range Pressure
typ. ± 2 mbarAccuracy Pressure at 25 °C (77 °C) and 20...80% RH
-40…60 °C (-40...140 °F)Measuring range Temperature
typ. ± 0.5 °C (± 0.9 °F)Accuracy Temperature at 25 °C (77 °F)
I²C or E2Digital interface
EE894 Datasheet(1124.35 kb)
EE894 Handling instruction(1039.37 kb)
EE-PCS Product Configuration Software(29828.69 kb)
Utilising the E2 Interface for EE894 - AN1808-1(296.53 kb)
E2 interface specification(223.84 kb)
Protocol Description I²C(1252.75 kb)
I²C a standardized on-board serial interface between one controller and multiple devices using data and clock line. For details about I²C, please see NXP UM10204 I²C-bus specification and user manual, Rev. 6, 4 April 2014.
E2 is a serial interface designed by E+E with unique command structure as well as reduced clock speed comparted to I²C. For more details about please see E2 Interface Specification.
The maximum cable length depends on the product, clock speed and pull-up resistor, and can be up to 10m. For detail please see E2 interface for humidity probes/modules.
I²C is an on-board interface, with bus lines up to 10cm. For longer bus please see the NXP wiring pattern.
Only one E+E device can be connected to the E2 interface of a controller.
Each I²C devices does have it's own ID by series, as long as this ID is unique in the bus this module or component could get built into the bus.
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.