Campbell Scientific CR10X Measurement and Control System User Manual
Page 263
APPENDIX F. DYNAGAGE SAP-FLOW (P67)
F-3
Appendix A
Instruction P67 Processing
Loc = input location assuming input locations 1,
2, 3, and 4 are used.
Par = Instruction P67 parameter.
Pin = (Loc 4)*(Loc 4)/(Par 3)
Qv = (((Loc 3)-(Loc 2))/(4.0*(Par 6)))*(Par
4)*(Par 5)
Qr = (Loc 1)*(Par 2)
Qf = Pin - Qv - Qr
Kshapp = (Pin - Qv)/(Loc 1)
dT = ((Loc 2+Loc 3)/2.0)*25.0
Sapflow = Qf/(dT*4.186)
If Par 7 µ 0.0 then go to XXXXXX
If Qf < (0.2*Pin) and If dT < Par 7, then Sapflow
= 0.0
If Qf < (0.2*Pin) and If Qf < 0.0, then Sapflow =
- 0.00001
XXXXXX
If Par 8 µ 0.0 then go to YYYYYY
Fmax = (Par 8)*(Par 4)
If Sapflow > Fmax, the Sapflow = Fmax
YYYYYY
Sapflow = (Sapflow*(Par 11))+(Par 12)
Transfer to Input Locations beginning with
Parameter 10, either short output or long output,
depending on Parameter 9.
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