Instruction manual

13
output signals from the HPV unit should lie between
±
40 mV for the 1
o
C difference in
temperature difference between the two sensors. The data logger is programmed to
interpret the temperature signals and to record the subsequent ‘cross-over’ times which
are used in Eq. (1) to calculate the raw heat-pulse velocity at a single point (depth) in the
conducting sapwood. A laptop PC is later used to retrieve the
t
z
data from the logger and
to calculate total sap flow in the tree stem, as described by Eqs. (4) - (6).
3. Connecting up the logger
and
getting it going.
This section refers to installation and operation of the the HPV units.
T
he wiring and
operation of the simple heat-pulse controller (no amplifiers) is described in Appendix B.
3.1 Assembling the necessary hardware.
The following is a list of hardware needed to run the HPV unit.
3.1.1. You will need 2 sets of:
.. heat pulse probes (white ones with grey connectors)
.. heat pulse cables (white ones with silver connectors)
and 1 set of:
.. heat pulse unit with power lead
.. suite of heat pulse programs to capture and analyze the heat-pulse data
The above items are supplied with your installation.
3.1.2. You will also need:
.. Campbell Datalogger (CR10X, CR21X or CR23X)
.. external 12V (>70 AHr) battery
.. Laptop with SC32 interface and Campbell Software (PC208W)
These items are not supplied with your installation.