Product characteristics

it has its own RTC, which supports low power consumption of all nodes in the whole network;

independent LED indication;

The accuracy of CO2 is ± 3%, and the measurement range is 0-5000 ppm;

integrated data storage, supporting automatic data collection and storage after network connection, with a maximum of 20000 records;

power supply mode is external power supply and battery power supply, external power supply voltage is 6V ~ 12V, battery power supply voltage is 3V;

optional 2.4GHz or 780mhz wireless working frequency band;

RF transmission power can be selected: - 11dbm ～ +10dBm@780MHz -17dBm ~ +3dBm@2.4GHz ;

Multi parameter configurable;

The data acquisition period is adjustable between 1s and 18h;

the enclosure meets IP53 protection level;

working temperature: - 40 ~ 85 ℃;

dimension (mm): 38 (diameter) x 150 (length)

Description and schematic diagram of network topology

Wems-co2 equipment supports point-to-point, star network and tree network architecture

1) It supports all nodes in the whole network to sleep in low-power mode;

2) Support timing data acquisition and control;

3) The timing time can be adjusted at any time, supporting 1 second to 18 hours;

4) The network supports multi-level routing, and any node can be used as a routing node;

5) The network supports link self-healing and automatically repairs the transmission link;

Detailed specifications

1、Technical index of 2.4GHz frequency band

Test conditions: VCC = 3.0V, working frequency: 2.45GHz, test temperature: 25 ℃

project	Parameter value	project	Parameter value
CPU + RF power supply voltage (VCC)	1.8～3.6V	Maximum transmitting power	+3dBm
Working current: RX mode	19mA	Minimum transmit power	-17dBm
Working current: TX mode	20mA	Receiving sensitivity	-101dBm
Working current: sleep mode	15uA	Wireless rate	250～2000kbps
RF operating frequency	2.4～2.48GHz	TX/RX RF interface impedance	50 Ohms
Number of available frequency bands	16	Open communication distance	750m
Frequency interval	5MHz	Timing acquisition interval	1秒～18小时
Enclosure protection class	IP53	Operating temperature range	-40～85℃
Boundary dimension (mm)	Diameter (43mm) × height (139mm)	Operating humidity range	0-95% non condensing

 2、Technical index of 780mhz frequency band

Test conditions: VCC = 3.0V, working frequency: 782mhz, test temperature: 25 ℃

project	Parameter value	project	Parameter value
CPU + RF power supply voltage (VCC)	1.8～3.6V	Maximum transmitting power	+10dBm
Working current: RX mode	15mA	Minimum transmit power	-11dBm
Working current: TX mode	29mA	Receiving sensitivity	-110dBm
Working current: sleep mode	15uA	Wireless rate	20～1000kbps
RF working frequency (China)	779～787MHz	TX/RX RF interface impedance	50 Ohms
Number of available RF bands	4	Frequency interval	5MHz
The communication distance is the longest in open land	2000m	Timing acquisition interval	1 second to 18 hours
Enclosure protection class	IP53	Operating temperature range	-40～85℃
Boundary dimension (mm)	Diameter (43mm) × height (139mm)	Operating humidity range	0-95% non condensing

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