Product characteristics

with RTC, supporting low power consumption of all nodes in the whole network; l independent LED indication;

a variety of measurement accuracy can be selected, measurement range: 0-100% vwc, - 40 ~ 50 ° C; humidity measurement accuracy: mineral soil: ± 3% (using Topp equation EC < 10ds / M), after calibration, the accuracy is 1-2%; temperature is ± 1 ℃.

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

The battery of wireless soil moisture conductivity sensor works for 1 year;

 optional 2.4GHz or 780mhz wireless working frequency band;

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

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

 the enclosure shall meet the protection level of IP65;

working temperature: - 40 ~ 85 ℃;

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

Description and schematic diagram of network topology

Wems-5tm 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 data acquisition cycle can be adjusted to support 1 second to 18 hours;

4) The network supports self-organized multi hop 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	Data acquisition cycle	1 second to 18 hours
Enclosure protection class	IP65	Operating temperature range	-40～85℃
Boundary dimension (mm)	Diameter (38mm) * height (150mm)	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
Open communication distance	2000m	Timing acquisition interval	1 second to 18 hours
Enclosure protection class	IP65	Operating temperature range	-40～85℃
Boundary dimension (mm)	Diameter (38mm) * height (150mm)	Operating humidity range	0-95% non condensing

ordering information