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Integrated Soil Moisture Monitoring Station - IC-SNiP-315L-SL

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Product code: IC-SNiP-315L-SL
Integrated soil moisture monitoring station. Measures Volumetric Water Content, permittivity, bulk EC, soil temperature and pore water electrical conductivity. Includes: 1 x Acclima TDR-315L Sensor, S-NODE with LoRaWAN communications, 13Ah rechargeable li-ion battery, 10W Solar Panel and SPLM7 mounting system for node and solar panel

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The SNiP-MP3 is a 'Sensor Node Integrated Package' for LoRa, LoRaWAN, FSK, or CAT-M1 communication of real-time accurate soil moisture measurements for continuous soil monitoring.

Optional features include GNSS to record device location for spatially enabled data.

The base SNiP-TDR integrates 1x S-NODE and 1x TDR-315L to a site's unique network, communication and power requirements. The S-NODE can support an added 3x TDR-315L sensors to monitor soil moisture at multiple depths.

The TDR-315L provides a measurement of Volumetric Soil Water % (VSW), based on the Time Domain Reflectometry (TDR) measurement principle.

S-NODE

he S-NODE has been designed to support the broad suite of SDI-12 based environmental sensors. The S-NODE can support sensors with higher power requirements; a solar panel can charge either the internal lithium-ion battery or both the node and sensor can be powered by an external 12V system (e.g. battery or mains source). The S-Node's SDI-12 communications can be customised to allow for interfacing with any SDI-12 sensor.

TDR-315L

The TDR-315L is a true Time Domain Reflectometer system (minus the coaxial cable) wrapped up in a small, rugged, permanently installable package. This model uses half the power yet it sacrifices none of the accuracy of its big brother the TDR-315. Acclima True TDR technology is a major, patented breakthrough in soil water and EC measurement technology.

Measures:

- Volumetric Water Content (0 to 100% with 0.1% resolution)
- Permittivity (1 to 80 with 0.1 unit resolution)
- Soil Electrical Conductivity a.k.a. Bulk EC (0 to 5000 ?S/cm -resolution depends on reading range)
- Soil Temperature (-40 to +60 C with 0.1 degree resolution)
- Pore Water Electrical Conductivity (0 to 55000 ?S/cm)

Features:

- 10 meter, flexible, waterproof cable
- 15 cm X 3.5mm stainless steel 3-element wave guide
- Rugged, waterproof epoxy housing
- Typical 350ps incident wave rise time applied directly to the soil (no bandwidth limiting coax cable).
- Input bandwidth to the waveform digitizer is also unrestrained because of the absence of a coax cable.

Operating parameters:

- Read time: 0.7 seconds
- Voltage Requirements: 6 to 15 volts DC
- Idle Current Consumption: less than 30 uA at 6 to 15 VDC
- Read Current Consumption: 170 mA at 6 to 15 VDC
- Idle Energy Consumption: 15 J per day at 6 VDC
- Read Energy Consumption: 0.7 J per reading at 6 VDC, 1.4 J per reading at 12 VDC

VWC and Permittivity Performance Specifications:

- Permittivity to VWC conversion method: Proprietary Dielectric Mixing Model with 0 to 100% range. Closely follows Topp Equation to 46% VWC.
- Permittivity Reporting Accuracy: +/- 1% of full scale 1 to 80 relative permittivity units. From 0 to 4000 uS/cm Bulk (in-soil) Electrical Conductivity; From -20 to +50 C. The VWC reading will only report liquid water.
- VWC Accuracy: Dependent upon soil type but typically +/- 2%; less than 1% change with Bulk EC changes from 0 to 4000 uS/cm. Change in VWC with compaction follows only the change in soil volume.
- Temperature: Precision thermistor located within 2 mm of the outer waveguide rod where it enters the epoxy housing.
- Accuracy: Typical, +/- 0.2 C; Worst Case, +/- 0.5 C over -12 to +50 C
- Electrical Conductivity: Calculated from long term (200 ns) amplitude of reflected wave using the 'waveguide constant'. Derived in factory during calibration.
- EC Accuracy: +/- 1%, +/- 35 uS/cm maximum error from 0 to 5000 uS/cm Bulk EC

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