ZSTM-3 Soil Sensor

ZSTM-3 soil sensor which can measure soil moisture & EC & temperature, provided with high accurate and high sensitive. It is an important tool to observe and study the occurrence, evolution, improvement and the dynamics water of saline soil.

By measuring the dielectric constant of the reaction of soil, soil direct stable real moisture content. This ZSTM-3 soil sensor can measure the volume of soil moisture. The soil moisture measurement method is in line with international standards at present. Apply to the soil moisture monitoring, scientific experiment, water-saving irrigation, greenhouse vegetables, flowers, grass, soil, plant cultivation, measured speed of sewage treatment, grain storage, greenhouse control, precision agriculture.

Monitoring Parameters	Soil Temperature / Soil Moisture / Soil EC
Monitoring Principle	TDR
Power-In	DC12/24V / Solar Power
Interface	RS485/RS232/Wifi/BT/LTE

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Technical Parameter

Model	ZSTM-3
Signal Output	Voltage output 0-2V （output impedance 0 ohm） Current output 4-20mA (load resistance <500ohm） RS485 Interface Modbus Protocol
Power Supply	3.6-30V/DC
Power Consumption	6mA@24V DC
Soil Moisture Measurement Range	0-100% volumetric moisture content Resolution: 0-50%, 0.03%, 1% within 50-100% Accuracy: 0-2%, inside 50% 3% within 50-100%
Conductivity Range	Optional range: 0-5000 us/cm, 0-10000 us/cm, 0-20000 us/cm Resolution: 10 us/cm within 0-10000 us/cm, 50 us/cm within 10000-20000 us /cm Precision: 0-10000 us/cm range : ±3%; 10000-20000 us/cm range : ±5%
EC Temperature Compensation	Compensation range 0-50℃
Soil Temperature Range	Range: – 40~80 ℃ Resolution: 0.1 ℃ Precision: ± 0.5 ℃
Measuring Principle PRINCIPLE	Soil moisture: FDR method Soil electrical: Alternating current bridge
Protection Grade	IP68
Operation Temperature	-40~85℃
Probe Material	Anti-corrosion special electrode
Sealing Material	Black flame-retardant epoxy resin
Installation	All embedded or probe inserted into the measured medium
Cable Length	2m
Dimension	4515145mm
Electrode Length	70mm

Application

Advantage

Soil moisture content, electrical conductivity and temperature three parameters.
One solution can also be used for fertilizer, and other nutrient solution conductivity matrix.
Electrode using special treatment of the alloy material, can withstand a strong external impact, not easy to damage.
Completely sealed, acid and alkali corrosion, can be buried in the soil or directly into the water for long-term dynamic testing.

Soil Sensors FAQs

What is a Soil Moisture Sensor?

Soil moisture sensors measure the volumetric water content in soil.Since the direct gravimetric measurement of free soil moisture requires removing, drying, and weighing of a sample, soil moisture sensors measure the volumetric water content indirectly by using some other property of the soil, such as electrical resistance, dielectric constant, or interaction with neutrons, as a proxy for the moisture content.

How does a Soil Moisture Sensor work?

The Soil Moisture Sensor uses capacitance to measure dielectric permittivity of the surrounding medium. In soil, dielectric permittivity is a function of the water content. The sensor creates a voltage proportional to the dielectric permittivity, and therefore the water content of the soil.

How is Soil Moisture measured?

Tensiometers are devices that measure soil moisture tension. They are sealed, water-filled tubes with a porous ceramic tip at the bottom and a vacuum gauge at the top. They are inserted in the soil to plants’ root zone depth.

How much area can a Soil Moisture Sensor cover?

Depending on the sensor technology used, the moisture is measured at every six inches to 48 inches depth or sometimes just at 12, 24, and 36 inches. The various depths vary from company to company, sensor type to sensor type.

What is the unit of Soil Moisture Sensor?

Volumetric Soil Moisture Content refers to the volume of water in a given volume of soil as discussed on previous pages. This type of Soil moisture Content is measured in m3.m-3 (so how much of a cubic metre is water out of the entire cubic metre of soil sample).