Model ASPTC Aspirated Shield with Fine Wire Thermocouple Revision: 6/10 C o p y r i g h t © 1 9 9 3 - 2 0 1 0 C a m p b e l l S c i e n t i f i c , I n c .
Warranty and Assistance The MODEL ASPTC ASPIRATED SHIELD WITH FINE WIRE THERMOCOUPLE is warranted by Campbell Scientific, Inc. to be free from defects in materials and workmanship under normal use and service for twelve (12) months from date of shipment unless specified otherwise. Batteries have no warranty. Campbell Scientific, Inc.'s obligation under this warranty is limited to repairing or replacing (at Campbell Scientific, Inc.'s option) defective products.
ASPTC Table of Contents PDF viewers note: These page numbers refer to the printed version of this document. Use the Adobe Acrobat® bookmarks tab for links to specific sections. 1. General .........................................................................1 1.1 Specifications............................................................................................1 1.2 Power Considerations ...............................................................................2 2. Mounting..................
Model ASPTC Aspirated Shield with Fine Wire Thermocouple 1. General The model ASPTC is an aspirated shield with a chromel-constantan thermocouple temperature sensor. One ASPTC can be used to measure absolute air temperature. Two ASPTCs are used to make delta temperature measurements. The differential voltage thermocouple instruction (TCDiff in CRBasic or Instruction 14 in Edlog) is recommended to measure the ASPTC, because a differential measurement reduces noise. 1.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple 1.2 Power Considerations The ASPTC should be powered by an external 12 VDC deep cycle, battery with an SP20R solar panel or the PS100 with the AC charger. A PS100 with a solar panel will not have enough reserve power for overcast days. 2. Mounting The ASPTC can be mounted on the Campbell Scientific's Bowen Ratio arms (see Figure 2-1) or UT018 crossarm (see Figure 2-2).
Model ASPTC Aspirated Shield with Fine Wire Thermocouple 3. Programming 3.1 Absolute Temperature The ASPTC is wired to the datalogger as shown in Figure 3-1. or AG CLEAR FIGURE 3-1. Wiring for a Single ASPTC 3.1.1 CRBasic CRBasic is provided in our LoggerNet, PC400, and RTDAQ datalogger support software. Dataloggers that are programmed with CRBasic include our CR800, CR850, CR1000, CR3000, CR5000, and CR9000(X). These dataloggers use the TCDiff instruction to measure the ASPTC.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple EXAMPLE 1.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple EXAMPLE 2. Sample CR10(X) Instructions for measuring Absolute Temperature with ASPTC 1: Temp (107) (P11)* 1: 1 Reps 2: 1 SE Channel 3: 3 Excite all reps w/E3 4: 1** Loc [ CR10TCR_C ] 5: 1 Mult 6: 0 Offset CAUTION: The CR10TCR reference temperature must be in degrees Celsius when used in Instruction 14. 2: Thermocouple Temp (DIFF) (P14) 1: 1 Reps 2: 21† ± 2.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple AG or GND FIGURE 3-2.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple EXAMPLE 3.
Model ASPTC Aspirated Shield with Fine Wire Thermocouple EXAMPLE 4. Sample CR10(X) Instructions for Measuring Temperature Gradient with the ASPTC 1: Temp (107) (P11)* 1: 1 Reps 2: 1 SE Channel 3: 3 Excite all reps w/E3 4: 1** Loc [ CR10TCR_C ] 5: 1 Mult 6: 0 Offset 2: Thermocouple Temp (SE) (P13) 1: 1 Reps 2: 21† ± 2.
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