HVAC (Heating Ventilation and Air-Conditioning) systems.

Electrical / Mechanical:

Power Input...........................................4,5-14 VDC, stabilized to within 10% (external protection circuits required)

Current Consumption ............................40 mA average

                                                             < 150 mA peak current (averaged during IR lamp ON, 120 msec)        

                                                             < 300 mA peak power (during IR lamp start-up, the first 50 msec)

Electrical Connections ........................terminals not mounted (G+, G0, OUT1, OUT2, Din1, Din2, Status, TxD, RxD)

Dimensions ........................................5,1 x 5,7 x 1,4 cm (Length x Width x approximate Height)

CO2 Measurement:

Sensing Method ....................................non-dispersive infrared (NDIR) waveguide technology with ABC

                                                              automatic background calibration algorithm

Sampling Method ..................................diffusion

Response Time (T_1/e) ...........................20 sec diffusion time

Measurement Range ............................0 -5 000 ppmvol

Sensitivity..............................................± 20 ppm ± 1 % of measured value

Accuracy .............................................± 30 ppm ± 5 % of measured value

Pressure Dependence...........................+ 1.6 % reading per kPa deviation from normal pressure, 100 kPa

On-board calibration support.................Din1 switch input to trigger Background Calibration @ 400 ppm CO2

                                                               Din2 switch input to trigger Zero Calibration @ 0 ppm CO2

Linear Signal Outputs:

D/A Conversion Accuracy......................± 2 % of reading ± 20 mV

OUT1 D/A Resolution.........................10 mV

              Linear Conversion Range ........0 -4 VDC for 0 -2 000 ppm  _vol.

             Electrical Characteristics...........R_OUT < 100 Ω, R_LOAD > 5kΩ , Power input > 4,5 V

OUT2 D/A Resolution.........................5 mV

Linear Conversion Range ........1 -5 VDC for 0 -2 000 ppm_vol.

Electrical Characteristics...........R_OUT < 100 Ω, R_LOAD > 5kΩ , Power input > 5,5 V

Digital Outputs:

    Electrical Characteristics High Output level in the range 2.3V min to DVDD = 3.3V. (1 mA source)

                                ............................. Low output level 0.75V max (4 mA sink). Protection 56R resistor in series.

             Function .................................. High level at CO2 High

 OUT3, CO2 High Alarm /Reset Level ... 800/700 ppm

OUT4, CO2 High Alarm /Reset Level ... 1000/900 ppm

UART Serial com port:

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