Campbell Scientific 110PV Surface Temperature Probe - Manual (Page 17)

110PV Surface Temperature Probe
5.1 CRBasic
The CR200(X)-series dataloggers use the ExDelSe instruction to measure the
110PV (see example in Section 5.1.1.1). The ExDelSe instruction has the
following syntax:
ExDelSE( Dest, Reps, SEChan, ExChan, ExmV, Delay, Mult, Offset )
The CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X) can use
either the BrHalf4W instruction or BrHalf instruction to measure the 110PV
(see examples in Sections 5.1.1.2 and 5.1.1.3).
For these dataloggers, the BrHalf4W instruction is typically preferred because
it reduces cable errors (see Figures 2-2 and 2-3). The BrHalf instruction
requires fewer input channels.
A typical BrHalf4W instruction follows:
BrHalf4W (Dest,1,mV2500,mV2500,1,Vx1,1,2500,True ,True ,0,250,1.0,0)
A typical BrHalf instruction follows:
BrHalf (Dest,1,mV2500,1,Vx1,1,2500,True ,0,250,1.0,0)
A multiplier of 1.0 and offset of 0.0 should be used in the ExDelSe, BrHalf4W,
and BrHalf instructions to yield a temperature in degrees Celsius. For
Fahrenheit multiply the calculated Celsius temperature by 1.8 then add 32.
5.1.1 CRBasic Examples
TABLE 5-1. Wiring for Example Programs
Datalogger Connection Color Description
BrHalf BrHalf4W
Black Voltage Excitation VX1 or EX1 VX1 or EX1
Red Signal SE1 Diff 1H
Purple Signal Reference Diff 1L
Blue Signal Reference Not Used
Clear Shield
Green Sense + Not Used Diff 2H
White Sense - Not Used Diff 2L
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