Measurement principle:

useThe FDR measurement principle simultaneously measures the salinity, moisture, and temperature in the soil, and corrects the soil moisture using the measured temperature and salinity.

Using interactive exemption calibration technology, the measured sensor data is compared with the central database curve, and the calibration parameters are reissued by the central database.

Direct integration of soil moisture sensors based onThe module and built-in antenna of NB IoT technology utilize the high gain, wide coverage, massive connections, and low power consumption characteristics of NB IoT technology to achieve sensor burial depth, connection quantity, and wireless networking.

Technical parameters:

Power supply:5-16V DC

power waste:85mA (working) 20mA (silent mode)

Measurement depth: 10cm per layer, 0.7m/1m/1.6m three depth options available

Measurement range: dry to saturation

Accuracy:±0.5%

The communication structure of the instrument is shown in the following figure. The values measured by the soil moisture sensor are processed through a series of steps, and thenNB IoT module realizes networking. The NB IoT module has the following advantages:

Strong Link: NB IoT can provide 50-100 times more access than existing wireless technologies at the same base station. One sector can support 100000 connections, with low latency sensitivity, ultra-low device cost, low device power consumption, and optimized network architecture.

High coverage: NB IoT has strong indoor coverage capability, with a 20dB gain increase compared to LTE, equivalent to a 100x increase in coverage area capability. After testing, the sensor can be buried at a depth of 100cm.

Low power consumption: Low power consumption is an important indicator of NB IoT chips, especially for soil moisture sensors. It is very difficult to replace batteries when buried underground.. NB IoT focuses on small data volume and low speed applications, so NB IoT devices can achieve very low power consumption, and device endurance can be greatly increased from the past few months to 10 years