:: Product Information

STM Soil Tension Meter

ICT

Applications:


Soil column testing

Moisture retention curves

Geotechnical engineering

Soil water potential for irrigation monitoring

The continuous measurement of soil water potential in the field, glasshouse or soil columns.

Precise measurements of soil matric potential

Live monitoring of sorption and desorption curves

Up to 5 sensor capacity


Specifications

Analogue Channels5 differential
Resolution0.00001V—24-Bit
Accuracy0.001V
Minimum Logging Interval1 second
Delayed StartSuspend Logging, Customised Intervals
Sampling Frequency10Hz

Data

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

POWER

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


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Dianjiang Group Limited
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Tel: (852) 3690 1588   Fax: (852) 3690 1586
Email: Dianjiang_HK@yahoo.com.hk   Hongkong@Dianjiangtech.com
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