模块特点: 1.方便安装2.PCB尺寸:5.1*5.7*1.4CM3.带有MODBUS通讯协议模块可选择测量项:温度,湿度,压力General Performance:Storage Temperature Range ................-30 to +70 °CSensor Life Expectancy ........................> 15 yearsMaintenance Interval ............................no maintenance requiredSelf-Diagnostics ...................................complete function check of the sensor moduleWarm-up Time .....................................≤ 1 minOperating Temperature Range ............0 to 50 °COperating Humidity Range ...................0 to 95% RH (non-condensing) Operating Environment ........................Residential, commercial, industrial spaces and Potentially dusty air ducts used in                                                             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)CO2Measurement:Sensing Method ....................................non-dispersive infrared (NDIR) waveguide technology with ABC                                                             automatic background calibration algorithmSampling Method ..................................diffusionResponse Time (T1/e) ...........................20 sec diffusion timeMeasurement Range ............................0 -5 000 ppmvolSensitivity..............................................± 20 ppm ± 1 % of measured valueAccuracy .............................................± 30 ppm ± 5 % of measured valuePressure Dependence...........................+ 1.6 % reading per kPa deviation from normal pressure, 100 kPaOn-board calibration support.................Din1 switch input to trigger Background Calibration @ 400 ppm CO2                                                              Din2 switch input to trigger Zero Calibration @ 0 ppm CO2Linear Signal Outputs:D/A Conversion Accuracy......................± 2 % of reading ± 20 mVOUT1 D/A Resolution.........................10 mV              Linear Conversion Range ........0 -4 VDC for 0 -2 000 ppm vol.             Electrical Characteristics...........ROUT< 100 Ω, RLOAD> 5kΩ , Power input > 4,5 VOUT2 D/A Resolution.........................5 mVLinear Conversion Range ........1 -5 VDC for 0 -2 000 ppmvol.Electrical Characteristics...........ROUT< 100 Ω, RLOAD> 5kΩ , Power input > 5,5 VDigital 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 atCO2High OUT3, CO2High Alarm /Reset Level ... 800/700 ppmOUT4, CO2High Alarm /Reset Level ... 1000/900 ppm UART Serial com port:    Protocol ...............................................MODBUS open protocol, refer specification and registers definitionsHardware interface ...............................CMOS UART with RxD, TxDRate                                                  ......9600