Campbell Scientific 43347 RTD Temperature Probe and 43502 Aspirated Radiation Shield - Manual (Page 18)

43347 RTD Temperature Probe, 43502 and 41003-5 Radiation Shields
7: 1 Loc [ RTD_C ]
8: 1 Mult
9: 0 Offset
;Apply calibration coefficients (probe specific)
;43347 Calibration T = -250.052585,+(R*2.375187e-1)+(R^2*1.258482e-5)
2: Polynomial (P55)
1: 1
Reps
2: 1 X Loc [ RTD_C ]
3: 1 F(X) Loc [ RTD_C ]
4: -250.05 C0 ;Coefficients will differ for each probe
5: 237.52 C1
6: 12.585 C2
7: 0.0
C3
8: 0.0 C4
9: 0.0 C5
5.2 Programming for Uncalibrated 43347-VX Probes
Instruction 9 applies an excitation voltage and makes two differential
measurements. A multiplier of 1.0 on the four wire half-bridge measurement
converts the measurement result to Rs/Ro (assuming Rf and Ro both equal
1000 ohms). The RTD temperature instruction converts Rs/Ro to temperature
in accordance with DIN Standard 43760. Because the alpha of the RTD used
in the temperature probe differs from DIN standard 43760, a multiplier of
1.0267 is required for Instruction 16.
5.2.1 CR1000 Example for Uncalibrated 43347-VX Probes
'CR1000
'Declare Variables
Public RTD_C
'Define Data Tables
DataTable(One_Hour,True,-1)
DataInterval(0,60,Min,0)
Sample(1,RTD_C,IEEE4)
EndTable
'Main Program
BeginProg
Scan(1,Sec,1,0)
'43347 RTD Temperature Probe (not calibrated) measurement RTD_C:
BrHalf4W(RTD_C,1,mV250,mV250,1,Vx1,1,2500,True,True,0,_60Hz,1,0)
PRT(RTD_C,1,RTD_C,1.0267,0)
'Call Data Tables and Store Data
CallTable(One_Hour)
NextScan
EndProg
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