Dynamax - Model TDP - Sap Velocity - Thermal Dissipation Probe - Manual

The transpiration rate of whole plants is closely approximated by the sap flow rate in the main stem or trunk. This quantity, expressed in g/h or similar units, can be measured and recorded in situ and noninvasively with Dynamax stem gages, which are wrapped around the stem or trunk. When the trunk diameter exceeds 50 mm (2 inches), the gages become larger and more complex. For trunks larger than 125 mm (5 inches), using stem gages is not practical. Also, each Dynamax trunk gage from 50 mm to 100 mm has 16 T-C junctions differentially arranged in four separate measurement locations around the trunk, making them more costly.