:: Product Information

SMM1 Soil Moisture Meter


Instrument Logging

Analogue Channels10 single ended
Minimum Logging Interval1 second
Delayed StartSuspend Logging, Customised Intervals
Sampling Frequency10Hz


CommunicationsUSB, Wireless Radio Frequency 2.4 GHz
Data StorageMicroSD Card, SD, SDHC & SDXC Compatible (FAT32 format)
Software CompatibilityWindows 7, 8, 8.1 & 10. Mac OS X
Data CompatibilityFAT32 format for direct exchange of SD card with any PC
Data File FormatComma Separated Values (CSV) for compatibility with all software programs
Memory CapacityUp to 16GB, 4GB microSD card included.

Operating Conditions

Temperature Range-40°C to +80°C
R/H Range0-100%
UpgradeableUser Upgradeable firmware using USB boot strap loader function


Internal Battery Specifications

960mAh Lithium Polymer, 4.20 Volts fully charged
External Power Requirements
Bus Power8-30 Volts DC, non-polarised, current draw is 190mA maximum at 17 volts per logger
USB Power5 Volts DC
Internal Charge Rate
Bus Power60mA – 200mA Variable internal charge rate, maximum charge rate of 200mA active when the external voltage rises above 16 Volts DC
USB Power100mA fixed charge rate
Internal Power Management
Fully Charged Battery4.20 Volts
Low Power Mode3.60 Volts – Instrument ceases to take measurements
Discharged Battery2.90 Volts – Instrument automatically switches off at and below this voltage when no external power connected.
Battery Life varies

Example A: With a recommended solar panel and/or recommended power source connected, operation can be continuous.Example B: Power consumption is dependent on number and type of sensors connected, frequency of measurement and measurement duration
  • The SMM1 is a stand-alone instrument and does not have extensive cabling and power requirements. All data is stored within the unit on a removable MicroSD card.

  • Communication with the SMM1 is made either with a USB or wireless connection. Wireless is capable of a range of up to 250m.

  • The SMM1 has a Windows and Mac compatible configuration software. The software is GUI based and extremely user friendly. Custom calibration equations or data can be entered and edited via the software. Real-time measurements, diagnostics and sensor configuration can easily be made.

  • The SMM1 has 2 wire, non-polarised bus for power input. There is no chance of incorrect wiring of positive and negative voltage because the SMM1 is non-polarised.

  • The SMM1 has an internal lithium-polymer battery that is kept charged by an external power supply (solar panel or mains). The instrument has internal voltage regulation for maximum power reliability.

  • The SMM1 is IP65 rated and has been demonstrated to operate in extreme environmental conditions. Units are being used in diverse environments from hot Australian deserts, tropical Amazon rainforests, temperate German forests, Indian agricultural fields and North American Arctic cold.


  • Soil volumetric moisture content (%)

  • Forest and catchment hydrology

  • Soil columns and geo-engineering

  • Railway Embankment

  • Mine Closure-Cover Design Modelling & Performance Monitoring

  • Landfill-GCL & Phytoremediation Performance

  • Modelling Water Movement

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Dianjiang Group Limited
Add: Room 1510,15/F,New Commerce Centre, No.19 On Sum Street, Shatin, N.T., Hong Kong.
Tel: (852) 3690 1588   Fax: (852) 3690 1586
Email: Dianjiang_HK@yahoo.com.hk   Hongkong@Dianjiangtech.com
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