INSTRUCTION MANUAL Model 108 Temperature Probe Revision: 3/14 C o p y r i g h t © 1 9 8 5 - 2 0 1 4 C a m p b e l l S c i e n t i f i c , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ................................................................. 1 2. Cautionary Statements ............................................... 1 3. Initial Inspection ......................................................... 1 4. Quickstart .................................................................... 1 5. Overview ...........
Table of Contents B. Example Programs.................................................. B-1 B.1 B.2 Example CRBasic Program ............................................................. B-1 Example Edlog Program.................................................................. B-1 C. Conversion of Thermistor Resistance or Voltage Ratio to Temperature .............................. C-1 Figures 6-1. 7-1. 7-2. 8-1.
Model 108 Temperature Probe 1. Introduction The 108 temperature probe uses a thermistor to measure temperature in air, soil, and water. It is compatible with all current dataloggers except the CR200(X) series and CR9000(X). 2. Cautionary Statements Santoprene® rubber, which composes the black outer jacket of the 108 cable, will support combustion in air. It is used because of its resistance to temperature extremes, moisture, and UV degradation. It is rated as slow burning when tested according to U.L.
Model 108 Temperature Probe 2 3. When Short Cut opens, select New Program. 4. Select Datalogger Model and Scan Interval (default of 5 seconds is OK for most applications). Click Next.
Model 108 Temperature Probe 5. Under the Available Sensors and Devices list, select the Sensors | Temperature folder. Select 108 Temperature Probe. Click to move the selection to the Selected device window. Data defaults to degree Celsius. This can be changed by clicking the Deg C box and selecting Deg F, for degrees Fahrenheit, or K, for Kelvin. 6. After selecting the sensor, click at the left of the screen on Wiring Diagram to see how the sensor is to be wired to the datalogger.
Model 108 Temperature Probe 5. 8. If LoggerNet, PC400, RTDAQ, or PC200W is running on your PC, and the PC to datalogger connection is active, you can click Finish in Short Cut and you will be prompted to send the program just created to the datalogger. 9. If the sensor is connected to the datalogger, as shown in the wiring diagram in step 6, check the output of the sensor in the datalogger support software data display to make sure it is making reasonable measurements.
Model 108 Temperature Probe Edlog Polynomial (P55) Linearization Error: <±0.5 °C (–5 to 95 °C) <±0.1 °C (–3 to 90 °C) 0.5 Edlog Error 0.4 CRBasic Therm108() Error 0.3 Error (°C) 0.2 0.1 0.0 -0.1 -0.2 -0.3 -0.4 -0.5 -10 0 10 20 30 40 50 60 70 80 90 100 Actual Temperature (°C) FIGURE 6-1. Linearization error, where error is the difference between actual and datalogger-computed temperature.
Model 108 Temperature Probe 7. Installation If you are programming your datalogger with Short Cut, skip Section 7.1, Wiring to Datalogger, and Section 7.2, Datalogger Programming. Short Cut does this work for you. See Section 4, Quickstart, for a Short Cut tutorial. 7.1 Wiring to Datalogger TABLE 7-1. Wire Color, Function, and Datalogger Connection 7.
Model 108 Temperature Probe outlined in Section 8.3, Electrically Noisy Environments, and Section 8.4, Long Cable Lengths. Details of 108 probe measurement and linearization of the thermistor output are provided in Section 8.2, Measurement and Output Linearization. 7.2.1 CRBasic The Therm108() measurement instruction programs CRBasic dataloggers (CR800-series, CR1000, CR3000, CR5000) to measure the 108 probe.
Model 108 Temperature Probe Variations: • • • 7.3 Temperature reported as °F – add a multiplier (P37) of 1.8 and an offset (P34) of 32 Ac mains noise filtering — see Section 8.3, Electrically Noisy Environments Compensate for long cable lengths — see Section 8.4, Long Cable Lengths Air Temperature Installation For air temperature measurements, sensors should be located over an open level area at least 9 m (EPA) in diameter.
Model 108 Temperature Probe 41303-5A 108 Tripod Mast or Tower Leg FIGURE 7-1. 108 and 41303-5A Radiation Shield on a tripod mast 41303-5A Tripod Mast or Tower Leg 108 CM200 Series Crossarm FIGURE 7-2. 108 and 41303-5A Radiation Shield on a CM200 Series Crossarm The 108 is held within radiation shield by a mounting clamp on the bottom plate of the 41303-5A (FIGURE 7-2). Loosen the two mounting clamp screws, and insert the sensor through the clamp and into the shield.
Model 108 Temperature Probe 7.4 Water Temperature Installation The 108 can be submerged to 15 m (50 ft) or 21 psi. The 108 is not weighted, so a weighting system should be added, or the probe secured to a fixed, submerged object such as a piling. 7.5 Soil Temperature The 108 tends to measure the average temperature over its length, so it should generally be buried such that the measurement tip is horizontal to the soil surface at the desired depth.
Model 108 Temperature Probe Vs/Vx = 1000 / (Rs + 40000 Ω + 1000 Ω) Solving for Rs: Rs + 41000 Ω = 1000 • (Vx/Vs) Rs = 1000 • (Vx/Vs) – 41000 Ω TABLE 8-1, 108 Measurement Details, and TABLE 8-2, 108 Temperature Calculation, describe how measurement results Vs/Vx and Rs are converted to temperature by Campbell Scientific dataloggers. TABLE 8-1.
Model 108 Temperature Probe C2 = –40.66 C3 = 16.573 C4 = –3.455 C5 = 0.301 1CRBasic dataloggers are CR800, CR1000, CR3000, and CR5000. provided by the thermistor manufacturer. 3Edlog dataloggers are CR10(X), CR510, CR500, CR23X, 21X, and CR7. 2Coefficients 8.3 Electrically Noisy Environments EMF noise emanating from the ac mains power grid can be a significant source of measurement error. 60 Hz noise is common in the United States. 50 Hz noise is common in Europe and other regions.
Model 108 Temperature Probe 01: Excite-Delay (SE) (P4) 1: 1 Rep 2: 3 ±25 mV slow range ;CR23X,21X,CR7: 50 mV 3: 9 IN Chan 4: 3 Excite all reps w/EXchan 3 5: 2 Delay (units .01sec) 6: 1000 mV Excitation ;CR23X,21X,CR7: 2000 mV 7: 11 Loc [:Temp_C ] 8: .2 Mult ;CR23X,21X,CR7: 0.1 9: 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 9. ] Troubleshooting and Maintenance NOTE 9.
Model 108 Temperature Probe 9.2 Maintenance The 108 probe requires minimal maintenance. For air temperature measurements, check the radiation shield monthly to make sure the radiation shield is clean and free from debris. Periodically check cabling for signs of damage and possible moisture intrusion. 9.3 Calibration Calibration of the 108 probe is not necessary unless the application requires removal of the thermistor interchangeability offset described in Section 6, Specifications.
Appendix A. Importing Short Cut Code This tutorial shows: • • How to import a Short Cut program into a program editor for additional refinement. How to import a wiring diagram from Short Cut into the comments of a custom program. A.1 Importing Short Cut Code into a Program Editor Short Cut creates files that can be imported into either CRBasic Editor or Edlog program editor. These files normally reside in the C:\campbellsci\SCWin folder and have the following extensions: • • • • • • .
Appendix A. Importing Short Cut Code 6. Import wiring information to the program by opening the associated .DEF file. Copy and paste the section beginning with heading “-Wiring for CRXXX–” into the CRBasic program, usually at the head of the file. After pasting, edit the information such that a ' character (single quotation mark) begins each line. This character instructs the datalogger compiler to ignore the line when compiling the datalogger code. A.1.
Appendix B. Example Programs B.1 Example CRBasic Program This example can be used directly with CR800 series, CR1000, CR3000, and CR5000 dataloggers. 'Program measures one 108 temperature probe once a second and 'stores the average temperature every 60 minutes.
Appendix B. Example Programs ;{CR10X} ;Program measures one 108 temperature probe once a second ;and stores the average temperature every 60 minutes. ;Wiring Diagram ;============== ;108 Probe ; ; Wire ; Color Function ; -----------; Black Voltage-excitation input ; Red Analog-voltage output ; Purple Bridge resistor lead ; Clear EMF Shield CR10X ----E1 SE1 AG G *Table 1 Program 01: 1.
Appendix C. Conversion of Thermistor Resistance or Voltage Ratio to Temperature TABLE C-1.
Appendix C.
Appendix C. Conversion of Thermistor Resistance or Voltage Ratio to Temperature 87 8523 88 8241 89 7970 90 7708 91 7457 92 7215 93 6982 94 6758 95 6541 96 6333 97 6132 98 5939 99 5753 100 5573 1Data from Measurement SpecialtiesTM 4.04 4.06 4.08 4.11 4.13 4.15 4.17 4.19 4.21 4.23 4.24 4.26 4.28 4.29 87.02 88.01 88.99 89.97 90.94 91.90 92.86 93.80 94.75 95.68 96.60 97.52 98.42 99.32 87.00 88.00 89.00 90.00 91.00 92.00 93.00 94.00 95.00 96.00 97.00 98.00 99.00 100.
Appendix C.
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