sensor for long term accurate monitoring of the tree trunk circumference increment
transmitting data to EMScloud Internet application via SigFox network
no upper limit in stem diameter
non invasive fixing
low maintenance and easy installation
resolution less than micrometer
data visualization, archiving and downloading fully supported by EMScloud Internet application
Mini32 software support
Non invasive fixing by tape
no effect on tree growth
integrated value for whole radial profile in measured height
almost identical thermal expansion of wood and stainless steel
battery replacement possible by keeping the sensor in position on the tree
Precise increment records
efficient tool for field measurement
comprises information of growth, water stress and freezing up of the trunk
low maintenance and energy requirements compared to sophisticated measuring systems such as sap flow for instance
together with soil water potential measurement it gives realistic picture of drought stress and the tree response to it
Specification
Measuring interval 30 min
Sending interval 60 min
Battery lifetime more than 2 years
Circumference measuring range 64 mm
Resolution less than 1μm
Internal temperature accuracy ± 0.3 °C
Protection rating IP68
Weight 450 g
Operating temperature –40 to 60 deg. C
Operating humidity 0 to 100%
