Wireless Soil Moisture Sensor by ALTA

Wireless Soil Moisture Sensor

Wireless Soil Moisture Sensor

Part #:MNS2-8-IN-WS-WM-L05

Frequency:868 MHz (Euro)

Battery: 10 years

Range: 360 metres

Wireless Soil Moisture Sensor


Product description

It’s easy to know your soil’s water and temperature condition with the ALTA® Soil Moisture Sensor. It provides a highly effective way to improve irrigation scheduling and efficiency. You’ll know when and where to water your crops, plants, or landscape from the data you gather.


See water tension to prevent water stress.

The Soil Moisture Sensor measures soil water tension (matric potential) and temperature. With a resistive granular matrix element, you can optimize your tension parameters to determine the earliest indication of water stress and make sure you irrigate before it reaches that point. The unique element feature delivers consistent calibration without needing to recalibrate for every installation.


The Sensor also has a thermistor-based temperature element. Its readings will help you assess temperature -40°C to 125°C (-40°F to 257°F) and the moisture’s temperature compensation, eliminating the need to measure moisture every time the soil temperature changes.

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ALTA Benefits


  * Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.

Data Snapshot

Soil Moisture Data snapshot

Box content

  – Wireless Sensor

  – Mounting Hardware

  – 3V Industrial Battery (Pre-Installed)

  – SMA Antenna


Sensor Specifications

Moisture Sensing Element
Element TypeResistive element with granular matrix
Range0.0 to 240.0 centibar or kPa (Water Tension)
Resolution~0.3 centibar or kPa 1
DimensionsDiameter: 0.875 in. (22 mm)
Length: 3.25 in. (83 mm)
MaterialsABS plastic caps with stainless steel body over a hydrophilic fabric covered granular matrix. (Will not dissolve in soil or be compromised by freezing temperatures)
Response Time~5 Minutes 2
Temperature Sensing Element
Element TypeThermistor embedded in sealed metal bullet
Accuracy+/- 1.0 Celsius
Measurement Range-40° C to 125° C (-40° F to 257° F)
Resolution0.1° C
Response TimeTypically less than 15 seconds
Cable Physical Specifications
General CompositionSoil moisture and temperature leads coupled together in a single sealed cable wrapped in a braided sleeve. Sleeve ends fixed using adhesive lined heat shrink.
Length63 in. (160 cm)
Connector EndKeyed M8 6-pin female connector, with M8 female coupling collar.
Cable Sleeve MaterialPolyethylene terephthalate (PET)
Overall Cable Operating Temperature-40° C to 80° C (-40° F to 176° F) 3,4
Weight4.07 oz. (115 g)
Sensor Base Connector
Base ConnectorKeyed M8 6-pin male connector
User Interface:
xxx.x centibars or kPa, xxx.x° C or F 5
Raw Data:
Soil Moisture: unsigned int, raw / 10 = centibars
Temperature: signed int, raw / 10 = Celsius

ALTA Industrial Specifications

Supply Voltage2.0 – 3.8 VDC
Battery TypeReplaceable 3.6V, 1500mAH (single AA sized)
Battery LifeUp to 10 Year Battery Life.**
Max Operating Temperature-40° to 80°C (-40° to 185°F)
Data LoggingDatalogs 2000 to 4000 readings if gateway connection is lost (non-volatile flash, persists through the power cycle): – 10-minute heartbeats = ~ 22 days – 2-hour heartbeats = ~ 266 days
Enclosure MaterialIP65, NEMA 4X, CE rated, sealed, weatherproof enclosure
UL RatingUL Listed to UL508-4x specifications (File E194432)
Dimension3.7 in x 2.32 in x 1.38 in

ALTA 868 MHz Specifications

Operating Frequency868 MHz Operating Frequency
CertificationsCE Certified. Tested and found to comply with: EN 300 220-2 V3.1.1 (2017-02), EN 300 220-2 V3.1.1 (2017-02) and EN 60950.


  * Actual range may vary depending on environment.
** Battery life is determined by sensor reporting frequency and other variables.


Specifications Image




Suggested Application Uses for This Sensor

  – Greenhouse Soil Monitoring

  – Grow House Monitoring

  – Commercial Landscaping

  – Environmental Monitoring

  – Crop Monitoring

  – Smart Watering

  – Agricultural Monitoring

  – Agronomy Research