Campbell Scientific ASPTC Aspirated Thermocouple - Manual (Page 8)

Model ASPTC Aspirated Shield with Fine Wire Thermocouple
EXAMPLE 1. Sample CR1000 program for measuring Absolute
Temperature with ASPTC
'CR1000
'Declare Variables and Units
Public PTemp_C
Public Temp_C
Units PTemp_C=Deg C
Units Temp_C=Deg C
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,10)
Average(1,Temp_C,FP2,False)
EndTable
'Main Program
BeginProg
Scan(1,Sec,1,0)
'Wiring Panel Temperature measurement PTemp_C
PanelTemp(PTemp_C,_60Hz)
'Type E (chromel-constantan) Thermocouple measurements Temp_C
TCDiff(Temp_C,1,mV2_5C,1,TypeE,PTemp_C,True,0,_60Hz,1,0)
'Call Data Tables and Store Data
CallTable(Table1)
NextScan
EndProg
3.1.2 Edlog
Edlog is provided in our LoggerNet and PC400 datalogger support software.
Dataloggers that are programmed with Edlog include our CR7, CR10(X),
CR23X, and 21X. These dataloggers use Instruction 11 to measure the
ASPTC. A reference temperature measurement is required.
The temperature of the datalogger wiring panel is used as the reference
temperature for the thermocouple measurement. The CR10(X) panel
temperature is measured with the CR10TCR using Instruction 11. The CR23X
and 21X panel temperature is found using Instruction 17. The 21X panel
temperature thermistor is located under differential input channel 4. Wiring
the ASPTC into differential channel 4 reduces potential error caused by
temperature gradients on the terminal strip. For the CR7, a PRT is included in
the CR723T input card. This built-in PRT is measured with Instruction 17.
The terminal strip cover should always be installed on the datalogger wiring
panel when measuring thermocouples.
For a detailed discussion on thermocouple measurements, see the
Measurement Section of the datalogger manuals. NOTE
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