Campbell Scientific 108-LC Temperature Probe for MetData1 - Manual (Page 9)

Model 108-LC Temperature Probe for MetData1
5
5. Programming
Information in this section is not necessary when programming
the MetData1 with the Short Cut Program Builder software.
Instruction 5 (AC Half Bridge) is used to measure the 108 temperature probe.
Instruction 55 (polynomial) is used to find the temperature in degrees Celsius.
MetData1 Datalogger Program Example
01: AC Half Bridge (P5)
1: 1 Reps
2: 3 ± 25 mV Slow Range
3: 8 or 9** In Chan
4: 3 Ex Chan Option
5: 1000 mV Excitation
6: 11* Loc [ Tmp108C ]
7: 200 Mult
8: 0 Offset
02: Polynomial (P55)
1: 1 Reps
2: 11* X Loc [ Tmp108C ]
3: 11* F(X) Loc [ Tmp108C ]
4: -26.97 C0
5: 69.635 C1
6: -40.66 C2
7: 16.573 C3
8: -3.455 C4
9: .301 C5
* Proper entries will vary with input location assignments.
** Specify input channel #8 for connector #4. Specify input channel #9 for connector #7.
TABLE 5-1. Polynomial Coefficients
Coefficient Value
C0 -26.97
C1 69.635
C2 -40.66
C3 16.573
C4 -3.455
C5 0.301
6. Maintenance and Calibration
The 108 Probe requires minimal maintenance. Check monthly to make sure the
radiation shield is free from debris.
NOTE